JPH09233008A - Diversity device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need for the adjustment process at manufacture and to enhance the reception accuracy. SOLUTION: This device is provided with 1st and 2nd antennas 1, 2, an antenna changeover switch 3, one series of receiver 4, an A/D converter 5, a digital orthogonal detector 6, a route Nyquist digital filter 7, and a demodulator 8 of one series. A received analog signal is converted into a digital signal by the A/D converter 5, and the digitized reception signal is subject to orthogonal detection processing, adjacent disturbing wave elimination processing by the route Nyquist digital filter 7, envelope signal calculation processing by an envelope signal calculation digital circuit 9, envelope signal band limit processing by a band limit digital filter 10, and envelope signal voltage level comparison processing by a digital comparator 13 sequentially, and a control circuit 14 selects a reception antenna whose envelope signal voltage level is higher.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diversity device used for portable communication equipment such as a digital mobile phone.

[0002]

2. Description of the Related Art In recent years, a diversity device including one receiver has come to be used in a digital mobile phone.

A conventional diversity device will be described below with reference to the drawings.

FIG. 11 is a block circuit diagram of a conventional diversity device. In FIG. 11, 101 is a first antenna for reception, 102 is a second antenna for reception, and 3 is a received signal received by either the first antenna 101 or the second antenna 102. The antenna changeover switch for selecting and outputting, 104 is a receiver for adjusting and outputting the gain and frequency of the reception signal output by the antenna changeover switch 103, 105 is a root Nyquist analog filter for removing interference waves, and 106 is a reception signal An analog quadrature detector for converting and outputting the I signal and the Q signal, 107 is an A / D converter for sampling the signal output by the analog quadrature detector 106, and 108 is a signal for outputting the A / D converter 107. Demodulator that demodulates and outputs 1
Reference numeral 09 is an envelope signal calculation analog circuit that calculates and outputs an envelope signal from the signal output by the root Nyquist analog filter 105, and 110 is the first antenna 1 among the envelope signals output by the envelope signal calculation analog circuit 109.
01 is a first sample / hold circuit that holds the envelope signal obtained from the received signal, and 111 is the reception signal received by the second antenna 102 among the envelope signals output from the envelope signal calculation analog circuit 109. A second sample / hold circuit for holding the envelope signal obtained from the signal, 112 is the first sample / hold circuit 110
And an analog comparator for comparing the envelope signals held in the second sample / hold circuit 111 and outputting a comparison result, and 113 is input to the antenna changeover switch 103 according to the comparison result output by the analog comparator 112. The control circuit switches the received signal.

The operation of the diversity device constructed as described above will be described below. First, the first antenna 101
After adjusting the gain and frequency of the signal received by the receiver 104 by the receiver 104, the root Nyquist analog filter 105
Then, the IF signal is obtained by removing the adjacent interfering wave. Next, the envelope signal is calculated from the IF signal by the analog signal processing of the envelope signal calculation analog circuit 109, and the first signal is calculated.
The sample / hold circuit 110 of FIG.

Next, the antenna selector switch 103 is switched to adjust the gain and frequency of the signal received by the second antenna 102 by the receiver 104, and then input to the root Nyquist analog filter 105 to remove adjacent interfering waves. Output the IF signal. Next, the envelope signal is calculated from the IF signal by the analog signal processing of the envelope calculation analog circuit 109, and is held in the second sample / hold circuit 111.

Next, the first sample hold circuit 110
And the analog envelope signals of the antennas 101 and 102 held by the second sample hold circuit 111 are compared by the analog comparator 112.

The above processing is performed before the reception slot.
On the reception slot side, the antenna having the higher envelope signal voltage level is selected by the antenna changeover switch 103 in the control circuit 113 based on the result of the analog comparator 112, and the reception signal is received by the receiver 104 and the root Nyquist analog filter 105. , Analog quadrature detector 106, A
Demodulation is performed using the / D converter 107 and the demodulator 108.

[0009]

However, in the conventional diversity apparatus, the received signals received by the respective antennas are compared by the voltage level of the analog envelope signal in the IF signal band. , It was necessary to use a narrow band analog bandpass root Nyquist filter. This analog band-pass type root Nyquist filter has a problem that it requires a step of adjustment because it is largely influenced by variations in elements, is expensive, and has a large mounting area. Furthermore, since the sampling point of the analog envelope signal is limited to one point,
It had a problem that it was easily affected by noise.

An object of the present invention is to solve the above-mentioned conventional problems all at once, to eliminate the need for an adjusting step at the time of manufacturing, and to improve the receiving accuracy.

[0011]

In order to achieve the above object, the present invention has a structure in which received signals received by respective antennas are digitized and compared.

[0012] Specifically, the solution means taken by the invention of claim 1 is that the diversity device selects a plurality of reception antennas and one reception signal among the reception signals received by the plurality of reception antennas. Antenna switching means to output,
Reception means for adjusting and outputting the gain and frequency of the reception signal output by the antenna switching means, A / D conversion means for sampling the signal output by the reception means, and digital output by the A / D conversion means Quadrature detection means for converting the signal into an I signal and a Q signal for output,
Adjacent interference wave removing means for removing and outputting the interference waves of the I signal and the Q signal output by the quadrature detecting means, and an envelope for calculating and outputting an envelope signal from the signal output by the adjacent interference wave removing means. Line signal calculating means, envelope signal noise removing means for removing and outputting noise of the envelope signal output by the envelope signal calculating means, and a signal output by the envelope signal noise removing means for each receiving antenna After that, the comparison means outputs the comparison result, and the control means for switching the antenna switching means based on the comparison result output by the comparison means.

According to the structure of claim 1, since the A / D converting means connected to the receiving means digitizes the received signal, the quadrature detecting means, the adjacent interfering wave removing means, the envelope signal calculating means, the envelope signal. The noise removing means and the comparing means are
The received signal can be processed as a digital signal.

Further, since it is provided with the digitally processed adjacent interfering wave removing means and the envelope signal noise removing means, it is resistant to abrupt changes in the received signal voltage and external noise.

According to a second aspect of the present invention, there is provided a diversity device,
A plurality of receiving antennas, an antenna switching unit that selects and outputs one received signal from the received signals received by the plurality of receiving antennas, and a gain and a frequency of the received signal output by the antenna switching unit are adjusted. And a signal output from the receiving means as an I signal and a Q signal.
A quadrature detection means for converting and outputting each of the signals, an A / D conversion means for sampling the I signal and the Q signal output by the quadrature detection means, and a digital signal output by the A / D conversion means. The adjacent interference wave removing means for removing and outputting the interference waves respectively, the envelope signal calculating means for calculating and outputting the envelope signal from the signal output by the adjacent interference wave removing means, and the envelope signal calculating means Envelope signal noise removing means for removing the noise of the output envelope signal and outputting it, and the signals output by the envelope signal noise removing means are held for each of the receiving antennas and then compared with each other, and a comparison result is output. And a control means for switching the antenna switching means based on the comparison result output from the comparison means.

According to the structure of claim 2, since the A / D converting means connected to the quadrature detecting means digitizes the received signal, the adjacent interfering wave removing means, the envelope signal calculating means,
The envelope signal noise removing means and the comparing means can process the received signal as a digital signal.

Further, since it is provided with the digitally processed adjacent interfering wave removing means and the envelope signal noise removing means, it is resistant to abrupt changes in the received signal voltage and external noise.

According to a third aspect of the present invention, the adjacent interfering wave removing means is a root Nyquist digital filter and the envelope signal noise removing means is a band-limited digital filter. To do.

According to a fourth aspect of the present invention, in the configuration of the first or second aspect, the adjacent interfering wave removing means is a root Nyquist digital filter, and the envelope signal noise removing means compares with a predetermined threshold value. A configuration including a digital comparator for outputting the result and a counter for counting the comparison result output by the digital comparator is added.

According to a fifth aspect of the present invention, in the configuration of the first or second aspect, the adjacent interference wave removing means is a root Nyquist digital filter, and the envelope signal noise removing means is a signal change rate of the envelope signal. A delta modulation circuit that requantizes with a smaller delta value is added.

According to a sixth aspect of the present invention, there is provided a diversity device,
A plurality of receiving antennas, an antenna switching unit that selects and outputs one received signal from the received signals received by the plurality of receiving antennas, and a gain and a frequency of the received signal output by the antenna switching unit are adjusted. To output the signal, the A / D converter for sampling the signal output from the receiver, and the digital signal output from the A / D converter to the I signal and the Q signal, respectively, and output the I signal and the Q signal. An envelope signal is calculated from the quadrature detection means, the adjacent interference wave removal means for removing and outputting the interference waves of the I signal and the Q signal output by the orthogonal detection means, and the signal output by the adjacent interference wave removal means. Envelope signal noise removing means for removing noise before outputting, and an envelope signal for calculating and outputting an envelope signal from the signal output by the envelope signal noise removing means. Line signal calculating means, comparing the envelope signal output by the envelope signal calculating means for each of the receiving antennas after each comparison, comparing means for outputting a comparison result, and the comparison result output by the comparing means. And a control means for switching the antenna switching means based on the above.

According to the structure of claim 6, since the A / D converting means connected to the receiving means digitizes the received signal, the quadrature detecting means, the adjacent interfering wave removing means, the envelope signal noise removing means, the envelope curve. The signal calculation means and the comparison means are
The received signal can be processed as a digital signal.

Further, since the adjacent interference wave removing means and the envelope signal noise removing means which are digitalized are provided, the apparatus is strong against abrupt fluctuation of the received signal voltage and external noise.

According to a seventh aspect of the present invention, there is provided a diversity device,
A plurality of receiving antennas, an antenna switching unit that selects and outputs one received signal from the received signals received by the plurality of receiving antennas, and a gain and a frequency of the received signal output by the antenna switching unit are adjusted. And a signal output from the receiving means as an I signal and a Q signal.
A quadrature detection means for converting and outputting each of the signals, an A / D conversion means for sampling the I signal and the Q signal output by the quadrature detection means, and each digital signal output by the A / D conversion means. An adjacent interfering wave removing unit that removes and outputs each interference wave; and an envelope signal noise removing unit that removes and outputs noise before calculating an envelope signal from a signal output by the adjacent interfering wave removing unit,
Envelope signal calculating means for calculating and outputting an envelope signal from the signal output by the envelope signal noise removing means, and after holding the envelope signal output by the envelope signal calculating means for each of the receiving antennas, respectively. The comparison is performed, and the comparison means outputs the comparison result, and the control means for switching the antenna switching means based on the comparison result output by the comparison means.

According to the configuration of claim 7, since the A / D conversion means connected to the quadrature detection means digitizes the received signal, the adjacent interfering wave removing means, the envelope signal noise removing means, the envelope signal calculating means. And the comparison means can process the received signal as a digital signal.

Further, since the adjacent interference wave removing means and the envelope signal noise removing means, which are digitalized, are provided, it becomes strong against abrupt fluctuation of the received signal voltage and external noise.

According to an eighth aspect of the present invention, in the configuration of the sixth or seventh aspect, the adjacent interfering wave removing means is a root Nyquist digital filter, and the envelope signal noise removing means is in parallel with the root Nyquist digital filter. A synchronization circuit that detects a symbol identification point from a signal output from the connected root Nyquist digital filter and outputs a synchronization signal synchronized at the time of detection, and the root Nyquist digital signal based on the synchronization signal output from the synchronization circuit. A configuration including a thinning circuit for extracting a symbol identification point signal from a signal output from a filter is added.

According to a ninth aspect of the present invention, in the configuration of the eighth aspect, the envelope signal noise removing means further includes a band limiting digital filter connected between the envelope signal calculating means and the comparing means. The configuration that is being added is added.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block circuit diagram of a diversity device according to a first embodiment of the present invention. In FIG.
1 is a first antenna of one of the two receiving antennas, 2 is a second antenna of the other of the two receiving antennas, 3 is received by the first antenna 1 or the second antenna 2 An antenna changeover switch, which is an antenna changeover means for selecting and outputting one of the received signals, and a reference numeral 4 is a reception means for adjusting the gain and frequency of the received signal output by the antenna changeover switch 3 and outputting it. 5 is an A / D converter which is an A / D converter for sampling the signal output from the receiver 4, and 6 is an I / D converter for the received signal.
Signal (= In-phase signal) and Q signal (= Quadrature signal)
A digital quadrature detector which is a quadrature detection means for converting to and output and a root Nyquist digital filter 7 which is an adjacent interference wave removal means for removing an interference wave of a received signal,
Reference numeral 8 denotes a demodulator that demodulates and outputs the signal output from the root Nyquist digital filter 7, and reference numeral 9 represents an envelope signal calculating means that calculates an envelope signal from the signal output from the root Nyquist digital filter 7 and outputs the envelope signal. A signal calculation digital circuit, 10 is a band-limited digital filter which is an envelope signal noise removing means for removing noise of the envelope signal output from the envelope signal calculation digital circuit 9, and 11 is an envelope which has passed through the band-limited digital filter 10. The first storage circuit, which is one of the comparing means for holding the envelope signal obtained from the received signal received by the first antenna 1 among the signals, 12 is the envelope passing through the band-limited digital filter 10. Among the signals, the comparison means for holding the envelope signal obtained from the received signal received by the second antenna 2 Second memory circuit which is one of, 1
Reference numeral 3 is a digital comparator which is one of comparison means for comparing envelope signals held in the first memory circuit 11 and the second memory circuit 12 and outputting a comparison result,
Reference numeral 14 is a control circuit as control means for switching the reception signal input to the antenna changeover switch 3 according to the comparison result output from the digital comparator 13. Although the number of receiving antennas is two in this embodiment, the number of receiving antennas can be three or more. When it is configured with three or more receiving antennas, it is necessary to make the antenna changeover switch 3, the digital comparator 13 and the control circuit 14 correspond to the number of receiving antennas, and prepare the memory circuits for the number of receiving antennas.

The operation of the diversity device constructed as described above will be described below. First, the reception signal received by the first antenna 1 is adjusted in gain and frequency by the receiver 4 and then sampled by the A / D converter 5. Next, after converting the output signal of the A / D converter 5 into the baseband I signal and Q signal by the digital quadrature detector 6,
Adjacent interference waves are removed from the received signal for each of the I channel and the Q channel through the root Nyquist digital filter 7. Next, after calculating the envelope signal from the output signal of the root Nyquist digital filter 7 by the envelope signal calculation digital circuit 9, the envelope signal is band-passed through the band limiting digital filter 10 to obtain the envelope signal. The voltage level is held in the first memory circuit 11.

Next, the antenna changeover switch 3 is changed over, the gain and frequency of the received signal received by the second antenna 2 are adjusted by the receiver 4, and then A
Sampling is performed by the / D converter 5. Next, A / D
The output signal of the converter 5 is converted into a baseband I signal and a Q signal by a digital quadrature detector 6, and then an I channel and a Q signal are passed through a root Nyquist digital filter 7.
Adjacent interference waves are removed from the received signal for each of the channels. Next, after calculating the envelope signal from the output signal of the root Nyquist digital filter 7 by the envelope signal calculation digital circuit 9, the envelope signal is band-passed through the band limiting digital filter 10 to obtain the envelope signal. The voltage level is held in the second memory circuit 12.

Next, the envelope comparator signal voltage levels of the received signals received by the respective antennas held in the first memory circuit 11 and the second memory circuit 12 are compared by the digital comparator 13.

The above processing is performed before the reception slot.
On the receiving slot side, based on the result of the digital comparator 13, the control circuit 14 selects the antenna having the higher envelope signal voltage level by the antenna changeover switch 3,
The received signal is demodulated using the receiver 4, the A / D converter 5, the digital quadrature detector 6, the root Nyquist digital filter 7 and the demodulator 8.

As described above, according to the present embodiment, the first antenna 1, the second antenna 2, the one-system receiver 4, A
TDMA including D / D converter 5, digital quadrature detector 6, root Nyquist digital filter 7, and demodulator 8
In a (= Time Division Multiplex Access) type data receiving device, a received signal is A / D-converted, and then quadrature detection processing, root Nyquist filter processing for removing adjacent interfering waves, envelope signal calculation, and envelope signal noise removal Since the envelope signal band limitation processing and the envelope signal comparison processing are realized by digital signal processing, an adjustment step is not required when manufacturing the adjacent interference wave removing means, and the calculated envelope signal is processed. Since the band is limited, it is possible to perform high-quality diversity processing that is resistant to instantaneous fluctuations in the envelope signal.

A second embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a block circuit diagram of the diversity device according to the second embodiment of the present invention. In FIG.
1 is a first antenna of one of the two receiving antennas, 2 is a second antenna of the other of the two receiving antennas, 3 is received by the first antenna 1 or the second antenna 2 An antenna changeover switch, which is an antenna changeover means for selecting and outputting one of the received signals, and a reference numeral 4 is a reception means for adjusting the gain and frequency of the received signal output by the antenna changeover switch 3 and outputting it. 5 is an A / D converter which is an A / D converter for sampling the signal output from the receiver 4, and 6 is an I / D converter for the received signal.
A digital quadrature detector which is a quadrature detection means for converting and outputting a signal and a Q signal, 7 is a root Nyquist digital filter which is an adjacent interfering wave removal means for removing an interference wave of a received signal, and 8 is a root Nyquist digital filter 7 A demodulator that demodulates and outputs the signal that is output by the root Nyquist digital filter 7, an envelope signal calculation digital circuit that is an envelope signal calculation means that calculates and outputs an envelope signal from the signal output by the root Nyquist digital filter 7, and 21 is A first digital comparator for comparing the input signal with a predetermined threshold, which is one of the noise removing means for the envelope signal output from the envelope signal calculation digital circuit 9, and 22 is the first digital comparator. One of the envelope signal noise removing means for counting the number of samples output by the comparator 21 and the number of samples larger than the threshold value. In a counter, 11 counter 2
1 is one of comparison means for holding the number of samples of the envelope signal obtained from the received signal received by the first antenna 1 among the number of samples of the envelope signal output by 2
2 is one of the comparing means for holding the number of samples of the envelope signal obtained from the reception signal received by the second antenna 2 among the envelope signals output by the counter 22. Memory circuit 23, the first memory circuit 1
A second digital comparator which is one of comparison means for comparing the sample numbers of the envelope signal held in the first and second memory circuits 12 and outputting the comparison result, 1
Reference numeral 4 is a control circuit as a control means for switching the reception signal input to the antenna changeover switch 3 according to the comparison result output from the second digital comparator 23. In this embodiment, the number of receiving antennas is two,
As with the first embodiment, it is possible to have three or more.

The operation of the diversity device constructed as described above will be described below. First, the signal received by the first antenna 1 is adjusted in gain and frequency by the receiver 4 and then sampled by the A / D converter 5. next,
The output signal of the A / D converter 5 is converted into baseband I and Q signals by the digital quadrature detector 6, and then, through the root Nyquist digital filter 7, each of the I channel and the Q channel receives an adjacent interference wave from the received signal. To remove. Next, the envelope signal calculation digital circuit 9 calculates an envelope signal from the output signal of the root Nyquist digital filter 7. The envelope signal is compared with a predetermined threshold value by the first digital comparator 21, and the number of samples larger than the threshold value is counted by the counter 22.
After the counting is performed and the counting result is held in the first memory circuit 11, the counter 22 is reset.

Next, the antenna changeover switch 3 is changed over, the gain and frequency of the received signal received by the second antenna 2 are adjusted by the receiver 4, and then A
Sampling is performed by the / D converter 5. Next, after the output signal of the A / D converter 5 is converted into a baseband I signal and a Q signal by the digital quadrature detector 6, it is converted from the received signal for each I channel and Q channel through the root Nyquist digital filter 7. Remove adjacent interference. Next, the root Nyquist digital filter 7
An envelope signal is calculated by the envelope signal calculation digital circuit 9 from the output signal of. The envelope signal is compared with a predetermined threshold value by the first digital comparator 21, the number of samples larger than the threshold value is counted by the counter 22, and the counting result is held in the second memory circuit 12. After that, the counter 22 is reset.

Next, the second digital comparator 23 compares the envelope signal voltage levels of the received signals received by the respective antennas held in the first memory circuit 11 and the second memory circuit 12.

The above processing is performed before the reception slot.
On the reception slot side, the control circuit 14 selects the antenna with the higher envelope signal voltage level by the antenna changeover switch 3 based on the result of the second digital comparator 23, and the selected reception signal is received by the receiver 4. , A / D converter 5, digital quadrature detector 6, root Nyquist digital filter 7 and demodulator 8 for demodulation.

As described above, according to the present embodiment, the first antenna 1, the second antenna 2, the one-system receiver 4, A
TDM including D / D converter 5, digital quadrature detector 6, root Nyquist digital filter 7 and demodulator 8
In the A-system data receiving apparatus, quadrature detection processing after A / D conversion of a received signal, root Nyquist filter processing for removing adjacent interfering waves, envelope signal calculation and envelope signal comparison processing are realized by digital signal processing, respectively. Therefore, an adjustment step is not required when manufacturing the adjacent interference wave removing means, and when comparing a plurality of received signals during operation, a sample larger than a predetermined threshold value among the calculated envelope signals. Since only the numbers are held for comparison, it is possible to perform high-quality diversity processing that is resistant to instantaneous fluctuations in the envelope signal.

The third embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a block circuit diagram of a diversity device according to the third embodiment of the present invention. In FIG.
1 is a first antenna of one of the two receiving antennas, 2 is a second antenna of the other of the two receiving antennas, 3 is received by the first antenna 1 or the second antenna 2 An antenna changeover switch, which is an antenna changeover means for selecting and outputting one of the received signals, and a reference numeral 4 is a reception means for adjusting the gain and frequency of the received signal output by the antenna changeover switch 3 and outputting it. 5 is an A / D converter which is an A / D converter for sampling the signal output from the receiver 4, and 6 is an I / D converter for the received signal.
A digital quadrature detector which is a quadrature detection means for converting and outputting a signal and a Q signal, 7 is a root Nyquist digital filter which is an adjacent interfering wave removal means for removing an interference wave of a received signal, and 8 is a root Nyquist digital filter 7 A demodulator which demodulates and outputs the signal output from the root Nyquist digital filter 7, an envelope signal calculation means for calculating an envelope signal from the signal output from the root Nyquist digital filter 7 and a digital circuit 31 Envelope signal calculation Delta modulation circuit, which is an envelope signal noise removing means for requantizing with a delta value smaller than the signal change rate of the envelope signal output by the digital circuit 9, 11 is a requantization output by the delta modulation circuit 31 Hold the envelope signal obtained from the received signal received by the first antenna 1 among the converted envelope signals. A first storage circuit, which is one of the comparing means, 12 is an envelope obtained from the reception signal received by the second antenna 2 among the requantized envelope signals output from the delta modulation circuit 31. A second memory circuit, which is one of comparison means for holding a signal, 13 is an envelope curve requantized by delta modulation held in the first memory circuit 11 and the second memory circuit 12, respectively. A digital comparator, which is one of comparison means for comparing signals and outputting a comparison result, 14 is a control means for switching the reception signal input to the antenna changeover switch 3 according to the comparison result output by the digital comparator 13. Control circuit.

Further, the delta modulation circuit 31 subtracts the delta modulation prediction signal output from the delay device 32 from the envelope signal input to the delay device 32 and the delta modulation circuit 31, which holds and outputs the delta modulation prediction signal. Subtractor 3 that outputs the result
3, a quantizer 34 that quantizes and outputs the output signal of the subtractor 33 with a delta value that is smaller than the rate of change of the envelope signal that is input to the delta modulation circuit 31, and a quantization result that the quantizer 34 outputs. The adder 35 is configured to add the delta modulation prediction signal output from the delay device 32 and output the addition result as a new delta modulation prediction signal to the delay device 32.

Although the number of receiving antennas is two in this embodiment, it is also possible to use three or more as in the first embodiment.

The operation of the diversity device constructed as above will be described below. First, the signal received by the first antenna 1 is adjusted in gain and frequency by the receiver 4 and then sampled by the A / D converter 5. next,
The output signal of the A / D converter 5 is converted into baseband I and Q signals by the digital quadrature detector 6, and then, through the root Nyquist digital filter 7, each of the I channel and the Q channel receives an adjacent interference wave from the received signal. To remove. Next, the envelope signal calculation digital circuit 9 calculates an envelope signal from the output signal of the root Nyquist digital filter 7, and the delta modulation circuit 31 requantizes the envelope signal. In the delta modulation circuit 31, the subtractor 33 subtracts the delta modulation prediction signal held in the delay device 32 from the input envelope signal, and the quantizer 34 subtracts the subtraction result from the input envelope signal. Quantize with a delta value smaller than the rate. The quantized result is added to the output signal of the delay device 32 by the adder 35, and is held in the delay device 32 again as a new delta modulation prediction signal. This quantization operation is repeated until the reception operation of the first antenna 1 ends, and when the reception operation of the first antenna 1 ends, the output signal of the delay device 32 is held in the first storage circuit 11. , Reset the delay device 32.

Next, the antenna changeover switch 3 is switched to adjust the gain and frequency of the signal received by the second antenna 2 by the receiver 4 and then sampled by the A / D converter 5. Next, after the output signal of the A / D converter 5 is converted into a baseband I signal and a Q signal by the digital quadrature detector 6, it is converted from the received signal for each I channel and Q channel through the root Nyquist digital filter 7. Remove adjacent interference. Next, the envelope signal calculation digital circuit 9 calculates an envelope signal from the output signal of the root Nyquist digital filter 7, and the delta modulation circuit 31 requantizes the envelope signal. In the delta modulation circuit 31, the subtractor 33 subtracts the delta modulation prediction signal held in the delay device 32 from the input envelope signal, and the subtraction result is the signal change of the envelope signal input by the quantizer 34. Quantize with a delta value smaller than the rate. The quantized result is added to the output signal of the delay device 32 by the adder 35, and is held in the delay device 32 again as a new delta modulation prediction signal. This quantization operation is repeated until the reception operation of the second antenna 2 ends, and when the reception operation of the second antenna 2 ends, the output signal of the delay device 32 is held in the second memory circuit 12. , Reset the delay device 32. Next, the digital comparator 13 compares the delta modulation signal voltage levels of the reception signals received by the respective antennas held in the first storage circuit 11 and the second storage circuit 12.

The above processing is performed before the reception slot.
On the reception slot side, based on the result of the digital comparator 13, the control circuit 14 selects the antenna with the higher delta modulation signal voltage level by the antenna changeover switch 3, and the reception signal is received by the receiver 4 and the A / D converter 5. , Digital quadrature detector 6, root Nyquist digital filter 7
And demodulating using the demodulator 8.

As described above, according to the present embodiment, the first antenna 1, the second antenna 2, the one-system receiver 4, A
TDM including D / D converter 5, digital quadrature detector 6, root Nyquist digital filter 7 and demodulator 8
In an A-system data receiving device, a received signal is A / D-converted and then subjected to quadrature detection processing, root Nyquist filter processing for removing adjacent interference waves, envelope signal calculation, delta modulation processing and delta modulation for removing envelope signal noise. Since the signal comparison processing is realized by digital signal processing, an adjustment process is not required when manufacturing the adjacent interference wave removing means, and band limitation is performed by the delta modulation processing that has a poor trackability to the envelope signal. Since this is performed, it is possible to perform high-quality diversity processing that is resistant to instantaneous fluctuations in the envelope signal.

The fourth embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 is a block circuit diagram of a diversity device according to the fourth embodiment of the present invention. In FIG.
1 is a first antenna of one of the two receiving antennas, 2 is a second antenna of the other of the two receiving antennas, 3 is received by the first antenna 1 or the second antenna 2 An antenna changeover switch, which is an antenna changeover means for selecting and outputting one of the received signals, and a reference numeral 4 is a reception means for adjusting the gain and frequency of the received signal output by the antenna changeover switch 3 and outputting it. 5 is an A / D converter which is an A / D converter for sampling the signal output from the receiver 4, and 6 is an I / D converter for the received signal.
A digital quadrature detector which is a quadrature detection means for converting and outputting a signal and a Q signal, 7 is a root Nyquist digital filter which is an adjacent interference wave removal means for removing an interference wave of a received signal, and 8 is a root Nyquist digital filter 7 The demodulator 41 demodulates and outputs the signal output from the root Nyquist digital filter 7. The reference numeral 41 is one of the envelope signal noise removing means for detecting the symbol identification point from the output signal of the root Nyquist digital filter 7 and outputting the detected timing. A synchronizing circuit, 42 is a thinning circuit which is one of the envelope signal noise removing means for outputting only the symbol identification point signal from the output signal of the root Nyquist digital filter 7 in synchronization with the timing signal output from the synchronizing circuit 41, 9 outputs an envelope signal calculated from the symbol identification point signal output from the thinning circuit 42. An envelope signal calculation digital circuit which is an envelope signal calculation means, and 11 holds the envelope signal obtained from the reception signal received by the first antenna 1 among the envelope signals output from the envelope signal calculation digital circuit 9. A first memory circuit, which is one of the comparison means, holds an envelope signal obtained from the received signal received by the second antenna 2 among the envelope signals output from the envelope signal calculation digital circuit 9. A second memory circuit, which is one of comparison means for
2 is a digital comparator which is one of comparison means for comparing envelope signals consisting only of symbol identification point signals and outputting a comparison result, and 14 is an antenna based on the comparison result output by the digital comparator 13. The control circuit serves as a control unit that switches the reception signal input to the changeover switch 3. Although the number of receiving antennas is two in the present embodiment, the number of receiving antennas can be three or more as in the first embodiment.

The operation of the diversity device constructed as described above will be described below. First, the signal received by the first antenna 1 is adjusted in gain and frequency by the receiver 4 and then sampled by the A / D converter 5. next,
The output signal of the A / D converter 5 is converted into a baseband I signal and a Q signal by the digital quadrature detector 6, and then, through the root Nyquist digital filter 15, each of the I channel and the Q channel receives an adjacent interference wave from the received signal. To remove. Next, the synchronization circuit 41 detects the symbol identification point from the output signal of the root Nyquist digital filter 7 and outputs the synchronization signal synchronized with the detection timing to the thinning circuit 42. The thinning circuit extracts and outputs only the symbol identification point signal from the output signal of the root Nyquist digital filter 7 in accordance with the synchronizing signal output from the synchronizing circuit 41. Next, the envelope signal calculation digital circuit 9 calculates the envelope signal from the symbol identification point signal, and the voltage level of the envelope signal is held in the first storage circuit 11.

Next, after the antenna changeover switch 3 is changed over and the signal received by the second antenna 2 is adjusted by the receiver 4 in terms of gain and frequency, A
Sampling is performed by the / D converter 5. Next, after converting the output signal of the A / D converter 5 into a baseband I signal and a Q signal by the digital quadrature detector 6, the I channel and the Q signal are passed through the root Nyquist digital filter 15.
Adjacent interference waves are removed from the received signal for each of the channels. Next, the synchronization circuit 41 detects the symbol identification point from the output signal of the root Nyquist digital filter 7 and outputs the synchronization signal synchronized with the detection timing to the thinning circuit 42. The decimation circuit extracts only the symbol identification point signal from the output signal of the root Nyquist digital filter 7 in accordance with the synchronization signal output from the synchronization circuit 41 and outputs it. Next, the envelope signal calculation digital circuit 9 from the symbol identification point signal. Then, the envelope signal is calculated according to, and the voltage level of the envelope signal is held in the second memory circuit 12.

Next, the digital comparator 13 compares the envelope signal voltage levels consisting of only the symbol identification point signals received by the respective antennas held by the first memory circuit 11 and the second memory circuit 12. The above processing is performed before the reception slot.

Next, on the receiving slot side, based on the result of the digital comparator 13, the antenna having the higher envelope signal voltage level is selected by the control circuit 14 by the antenna changeover switch 3, and the selected received signal is selected. Demodulation is performed using the receiver 4, the A / D converter 5, the digital quadrature detector 6, the root Nyquist digital filter 7, and the demodulator 8.

As described above, according to the present embodiment, the first antenna 1, the second antenna 2, the one-system receiver 4, A
TDM including D / D converter 5, digital quadrature detector 6, root Nyquist digital filter 7 and demodulator 8
In the data receiving device by the A system, the received signal is A /
After D conversion, quadrature detection processing, root Nyquist filter processing to remove adjacent interference waves, envelope signal band limitation processing to remove envelope signal noise, envelope signal calculation and envelope signal comparison processing are realized by digital signal processing, respectively. Therefore, the adjustment step is not required when manufacturing the adjacent interference wave removing means, and when comparing a plurality of received signals during operation, only the symbol identification points are extracted and only the DC component is compared. Therefore, it is possible to perform high-quality diversity processing that is resistant to instantaneous fluctuations in the envelope signal.

The fifth embodiment of the present invention will be described below with reference to the drawings.

FIG. 5 is a block circuit diagram of a diversity device according to the fifth embodiment of the present invention. In FIG.
1 is a first antenna of one of the two receiving antennas, 2 is a second antenna of the other of the two receiving antennas, 3 is received by the first antenna 1 or the second antenna 2 An antenna changeover switch, which is an antenna changeover means for selecting and outputting one of the received signals, and a reference numeral 4 is a reception means for adjusting the gain and frequency of the received signal output by the antenna changeover switch 3 and outputting it. 5 is an A / D converter which is an A / D converter for sampling the signal output from the receiver 4, and 6 is an I / D converter for the received signal.
A digital quadrature detector which is a quadrature detection means for converting and outputting a signal and a Q signal, 7 is a root Nyquist digital filter which is an adjacent interference wave removal means for removing an interference wave of a received signal, and 8 is a root Nyquist digital filter 7 The demodulator 41 demodulates and outputs the signal output from the root Nyquist digital filter 7. The reference numeral 41 is one of the envelope signal noise removing means for detecting the symbol identification point from the output signal of the root Nyquist digital filter 7 and outputting the detected timing. A synchronizing circuit, 42 is a thinning circuit which is one of the envelope signal noise removing means for outputting only the symbol identification point signal from the output signal of the root Nyquist digital filter 7 in synchronization with the timing signal output from the synchronizing circuit 41, 9 outputs an envelope signal calculated from the symbol identification point signal output from the thinning circuit 42. A envelope signal calculating means envelope signal calculated digital circuit, is is one band limiting digital filter of the noise removal means for envelope signal output envelope signal calculated digital circuit 9 is 10, 1
Reference numeral 1 is a first memory circuit which is one of comparison means for holding an envelope signal obtained from the reception signal received by the first antenna 1 among the envelope signals output from the band limiting digital filter 10, and 12 is Band limiting digital filter 10
Of the envelope signals output by the second antenna 2, which is one of comparison means for holding the envelope signal obtained from the reception signal received by the second antenna 2, 13 is the first storage circuit 11 and A digital comparator, which is one of comparison means for comparing the envelope signals composed only of the symbol identification point signals respectively held in the second memory circuit 12 and outputting the comparison result, 14 is output by the digital comparator 13. The control circuit serves as control means for switching the received signal input to the antenna changeover switch 3 according to the comparison result. Although the number of receiving antennas is two in the present embodiment, the number of receiving antennas can be three or more as in the first embodiment.

The operation of the diversity device configured as above will be described below. First, the signal received by the first antenna 1 is adjusted in gain and frequency by the receiver 4 and then sampled by the A / D converter 5. next,
The output signal of the A / D converter 5 is converted into a baseband I signal and a Q signal by the digital quadrature detector 6, and then, through the root Nyquist digital filter 15, each of the I channel and the Q channel receives an adjacent interference wave from the received signal. To remove. Next, the synchronization circuit 41 detects the symbol identification point from the output signal of the root Nyquist digital filter 7 and outputs the synchronization signal synchronized with the detection timing to the thinning circuit 42. The thinning circuit extracts and outputs only the symbol identification point signal from the output signal of the root Nyquist digital filter 7 in accordance with the synchronizing signal output from the synchronizing circuit 41. Next, after the envelope signal calculation digital circuit 9 calculates the envelope signal from the symbol identification point signal, band limiting is performed through the band limiting digital filter 10 to set the voltage level of the envelope signal to the first storage circuit. Hold at 11.

Next, the antenna changeover switch 3 is changed over, and the signal received by the second antenna 2 is adjusted by the receiver 4 in terms of gain and frequency.
Sampling is performed by the / D converter 5. Next, after converting the output signal of the A / D converter 5 into a baseband I signal and a Q signal by the digital quadrature detector 6, the I channel and the Q signal are passed through the root Nyquist digital filter 15.
Adjacent interference waves are removed from the received signal for each of the channels. Next, the synchronization circuit 41 detects the symbol identification point from the output signal of the root Nyquist digital filter 7 and outputs the synchronization signal synchronized with the detection timing to the thinning circuit 42. The decimation circuit extracts only the symbol identification point signal from the output signal of the root Nyquist digital filter 7 in accordance with the synchronization signal output from the synchronization circuit 41 and outputs it. Next, the envelope signal calculation digital circuit 9 from the symbol identification point signal. After calculating the envelope signal by, the band limiting is performed through the band limiting digital filter 10 and the voltage level of the envelope signal is held in the second memory circuit 12.

Next, the digital comparator 13 compares the envelope signal voltage levels consisting of only the symbol identification point signals received by the respective antennas held by the first memory circuit 11 and the second memory circuit 12. The above processing is performed before the reception slot.

Next, on the receiving slot side, based on the result of the digital comparator 13, the antenna having the higher envelope signal voltage level is selected by the control circuit 14 by the antenna changeover switch 3, and the selected received signal is selected. Demodulation is performed using the receiver 4, the A / D converter 5, the digital quadrature detector 6, the root Nyquist digital filter 7, and the demodulator 8.

As described above, according to the present embodiment, the first antenna 1, the second antenna 2, the one-system receiver 4, A
TDM including D / D converter 5, digital quadrature detector 6, root Nyquist digital filter 7 and demodulator 8
In the data receiving device by the A system, the received signal is A /
After D conversion, quadrature detection processing, root Nyquist filter processing to remove adjacent interference waves, envelope signal band limitation processing to remove envelope signal noise, envelope signal calculation and envelope signal comparison processing are realized by digital signal processing, respectively. Therefore, the adjustment process is not required when manufacturing the adjacent interference wave removing means, and when comparing a plurality of received signals during operation, only the symbol identification points are extracted to make only the DC component, and further the DC component. Since the filter processing is performed on the above, it is possible to perform high-quality diversity processing that is more resistant to the instantaneous fluctuation of the envelope signal.

The sixth embodiment of the present invention will be described below with reference to the drawings.

FIG. 6 is a block circuit diagram of a diversity device according to a sixth embodiment of the present invention. The difference from the first embodiment is that the quadrature detection process is processed by an analog signal. In FIG. 6, 1 is a first antenna of one of the two receiving antennas, 2 is a second antenna of the other of the two receiving antennas, 3 is the first antenna 1 or the second antenna. 2, an antenna changeover switch which is an antenna changeover means for selecting and outputting any one of the received signals received by 2 is a reception which outputs by adjusting the gain and frequency of the reception signal output by the antenna changeover switch 3. The receiver is a means, 61 is an analog quadrature detector which is a quadrature detection means for converting a reception signal into an I signal and a Q signal and outputting the signal, and 5 is an analog quadrature detector 6.
A / that samples the I and Q signals output by 1
An A / D converter which is a D converting means, 7 is a root Nyquist digital filter which is an adjacent interfering wave removing means which removes an interference wave of a reception signal, and 8 is a signal which is demodulated and output from the signal output by the root Nyquist digital filter Demodulator,
Reference numeral 9 is an envelope signal calculation digital circuit which is an envelope signal calculation means for calculating and outputting an envelope signal from the signal output from the root Nyquist digital filter 7. Reference numeral 10 is an envelope signal output from the envelope signal calculation digital circuit 9. A band-limited digital filter that is an envelope signal noise removing means for removing the noise of the first antenna 1 of the envelope signal that has passed through the band-limited digital filter 10.
The first storage circuit, which is one of the comparing means for holding the envelope signal obtained from the received signal received by, is the second antenna 2 of the envelope signal that has passed through the band limiting digital filter 10. The second storage circuit, which is one of the comparing means for holding the envelope signal obtained from the received signal received by the second storage circuit 13, is held in the first storage circuit 11 and the second storage circuit 12, respectively. A digital comparator, which is one of comparison means for comparing the envelope signals present and outputting a comparison result, 14 switches the reception signal input to the antenna changeover switch 3 according to the comparison result output by the digital comparator 13. It is a control circuit as a control means. Although the number of receiving antennas is two in the present embodiment, the number of receiving antennas can be three or more as in the first embodiment.

The operation of the diversity device configured as above will be described below. First, the gain and frequency of the reception signal received by the first antenna 1 are adjusted by the receiver 4, and then the adjusted reception signal is adjusted by the analog quadrature detector 61.
Is converted into a baseband I signal and a Q signal. Next, after the converted I signal and Q signal are sampled by the A / D converter 5, adjacent interference waves are removed from the received signal for each of the I channel and Q channel through the root Nyquist digital filter 7. Next, after the envelope signal is calculated by the envelope signal calculation digital circuit 9 from the output signal of the root Nyquist digital filter 7, the envelope signal is calculated by the band limiting digital filter 1
The band is limited through 0, and the voltage level of the envelope signal is held in the first memory circuit 11.

Next, the antenna changeover switch 3 is changed over, the gain and frequency of the received signal received by the second antenna 2 are adjusted by the receiver 4, and then A
Sampling is performed by the / D converter 5. Next, A / D
The output signal of the converter 5 is converted into a baseband I signal and a Q signal by a digital quadrature detector 6, and then an I channel and a Q signal are passed through a root Nyquist digital filter 7.
Adjacent interference waves are removed from the received signal for each of the channels. Next, after calculating the envelope signal from the output signal of the root Nyquist digital filter 7 by the envelope signal calculation digital circuit 9, the envelope signal is band-passed through the band limiting digital filter 10 to obtain the envelope signal. The voltage level is held in the second memory circuit 12.

Next, the digital comparator 13 compares the envelope signal voltage levels of the received signals received by the respective antennas held in the first memory circuit 11 and the second memory circuit 12.

The above processing is performed before the reception slot.
On the receiving slot side, based on the result of the digital comparator 13, the control circuit 14 selects the antenna having the higher envelope signal voltage level by the antenna changeover switch 3,
Received signal is received by receiver 4, analog quadrature detector 61, A / D
Demodulation is performed using the converter 5, the root Nyquist digital filter 7, and the demodulator 8.

As described above, according to this embodiment, the first antenna 1, the second antenna 2, the receiver 4 of one system, the analog quadrature detector 61, the A / D converter 5, the root Nyquist digital filter 7 are provided. , TDMA with demodulator 8
System data receiving apparatus, root Nyquist filter processing for removing adjacent interfering waves after A / D conversion of received signals, envelope signal calculation, envelope signal band limiting processing for removing envelope signal noise, and envelope signal comparison Since each processing is realized by digital signal processing, an adjustment step is not required when manufacturing the adjacent interference wave removing means, and the calculated envelope signal is band-limited, so that the envelope signal is It is possible to perform high-quality diversity processing that is resistant to instantaneous fluctuations in.

The seventh embodiment of the present invention will be described below with reference to the drawings.

FIG. 7 is a block circuit diagram of a diversity device according to a seventh embodiment of the present invention. The difference from the second embodiment is that the quadrature detection processing is processed by an analog signal. In FIG. 7, 1 is the first antenna of one of the two receiving antennas, 2 is the second antenna of the other of the two receiving antennas, 3 is the first antenna 1 or the second antenna 2, an antenna changeover switch which is an antenna changeover means for selecting and outputting any one of the received signals received by 4 is a reception which adjusts the gain and frequency of the reception signal outputted by the antenna changeover switch 3 and outputs it. The receiver is a means, 61 is an analog quadrature detector which is a quadrature detection means for converting a received signal into an I signal and a Q signal and outputting the I signal and the Q signal, and 5 is an analog quadrature detector 6
A / that samples the I and Q signals output by 1
An A / D converter which is a D converting means, 7 is a root Nyquist digital filter which is an adjacent interfering wave removing means which removes an interference wave of a reception signal, and 8 is a signal which is demodulated and output from the signal output by the root Nyquist digital filter Demodulator,
Reference numeral 9 is an envelope signal calculation digital circuit which is an envelope signal calculation means for calculating and outputting an envelope signal from the signal output from the root Nyquist digital filter 7, and 21 is an envelope signal output from the envelope signal calculation digital circuit 9. , A first digital comparator for comparing a predetermined threshold value with an input signal, and 22 is the number of samples output by the first digital comparator 21 and the threshold value. A counter, which is one of the envelope signal noise removing means for counting a larger number of samples than the above, the reference numeral 11 indicates the number of samples of the envelope signal output by the counter 22 from the received signal received by the first antenna 1. The first memory circuit, which is one of the comparing means for holding the obtained sample number of the envelope signal, 12 is the first of the envelope signals output from the counter 22. Second memory circuit, which is one of the comparing means for holding the number of samples of the envelope signal obtained from the received signal received by the antenna 2 of the above, and 23 is the first memory circuit 11 and the second memory circuit. A second digital comparator, which is one of the comparing means for comparing the sample numbers of the envelope signal held in 12 and outputting the comparison result, and 14 is output by the second digital comparator 23. It is a control circuit as a control means for switching the reception signal input to the antenna changeover switch 3 according to the comparison result. Although the number of receiving antennas is two in the present embodiment, the number of receiving antennas can be three or more as in the first embodiment.

The operation of the diversity device configured as above will be described below. First, the receiver 4 adjusts the gain and frequency of the signal received by the first antenna 1, and then the analog quadrature detector 61 converts the adjusted reception signal into baseband I and Q signals. next,
After the converted I and Q signals are sampled by the A / D converter 5, adjacent interference waves are removed from the received signal for each of the I and Q channels through the root Nyquist digital filter 7. Next, the envelope signal calculation digital circuit 9 calculates an envelope signal from the output signal of the root Nyquist digital filter 7. The envelope signal is compared with a predetermined threshold value by the first digital comparator 21, the number of samples larger than the threshold value is counted by the counter 22, and the counting result is held in the first storage circuit 11. After that, the counter 22 is reset.

Next, the antenna changeover switch 3 is changed over, the gain and frequency of the received signal received by the second antenna 2 are adjusted by the receiver 4, and then A
Sampling is performed by the / D converter 5. Next, after the output signal of the A / D converter 5 is converted into a baseband I signal and a Q signal by the digital quadrature detector 6, it is converted from the received signal for each I channel and Q channel through the root Nyquist digital filter 7. Remove adjacent interference. Next, the root Nyquist digital filter 7
An envelope signal is calculated by the envelope signal calculation digital circuit 9 from the output signal of. The envelope signal is compared with a predetermined threshold value by the first digital comparator 21, the number of samples larger than the threshold value is counted by the counter 22, and the counting result is held in the second memory circuit 12. After that, the counter 22 is reset.

Next, the second digital comparator 23 compares the envelope signal voltage levels of the received signals received by the respective antennas held in the first memory circuit 11 and the second memory circuit 12.

The above processing is performed before the reception slot.
On the reception slot side, the control circuit 14 selects the antenna with the higher envelope signal voltage level by the antenna changeover switch 3 based on the result of the second digital comparator 23, and the selected reception signal is received by the receiver 4. , Analog quadrature detector 61, A / D converter 5, root Nyquist digital filter 7 and demodulator 8 for demodulation.

As described above, according to this embodiment, the first antenna 1, the second antenna 2, the receiver 4 of one system, the analog quadrature detector 61, the A / D converter 5, the root Nyquist digital filter 7 are provided. And TDM with demodulator 8
In the A-system data receiving apparatus, since root Nyquist filter processing for removing adjacent interference waves after A / D conversion of the received signal, envelope signal calculation, and envelope signal comparison processing are realized by digital signal processing, respectively.
No adjustment process is required when manufacturing the adjacent interference wave removing means, and when comparing multiple received signals during operation, only the number of samples of the calculated envelope signal that is greater than a predetermined threshold value is retained. Since they are compared with each other, it is possible to perform high-quality diversity processing that is resistant to instantaneous fluctuations in the envelope signal.

The eighth embodiment of the present invention will be described below with reference to the drawings.

FIG. 8 is a block circuit diagram of a diversity apparatus according to the eighth embodiment of the present invention. The difference from the third embodiment is that the quadrature detection processing is processed by an analog signal. In FIG. 8, 1 is one first antenna of the two receiving antennas, 2 is the other second antenna of the two receiving antennas, 3 is the first antenna 1 or the second antenna 2, an antenna changeover switch which is an antenna changeover means for selecting and outputting any one of the received signals received by 4 is a reception which adjusts the gain and frequency of the reception signal outputted by the antenna changeover switch 3 and outputs it. The receiver is a means, 61 is an analog quadrature detector which is a quadrature detection means for converting a reception signal into an I signal and a Q signal and outputting the signal, and 5 is an analog quadrature detector 6.
A / that samples the I and Q signals output by 1
An A / D converter which is a D converting means, 7 is a root Nyquist digital filter which is an adjacent interfering wave removing means which removes an interference wave of a reception signal, and 8 is a signal which is demodulated and output from the signal output by the root Nyquist digital filter Demodulator,
Reference numeral 9 is an envelope signal calculation digital circuit which is an envelope signal calculation means for calculating and outputting an envelope signal from the signal output from the root Nyquist digital filter 7, and 31 is an envelope signal output from the envelope signal calculation digital circuit 9. Delta modulation circuit, which is an envelope signal noise removing means for requantizing with a delta value smaller than the signal change rate of, the first antenna 1 of the requantized envelope signals output from the delta modulation circuit 31. Of the re-quantized envelope signal output from the delta modulation circuit 31 is a first memory circuit which is one of the comparing means for holding the envelope signal obtained from the received signal received by The second storage circuit, which is one of the comparison means for holding the envelope signal obtained from the reception signal received by the antenna 2 of 2, and 13 is the first storage circuit 11. And a digital comparator which is one of comparison means for outputting the comparison result by comparing the envelope signals requantized by the delta modulation held in the second storage circuit 12, and 14 is a digital comparison Bowl 13
It is a control circuit as a control means for switching the reception signal input to the antenna changeover switch 3 according to the comparison result output by.

Further, the delta modulation circuit 31 subtracts the delta modulation prediction signal output from the delay device 32 from the delay unit 32 which holds and outputs the delta modulation prediction signal and the envelope signal input to the delta modulation circuit 31. Subtractor 3 that outputs the result
3, a quantizer 34 that quantizes and outputs the output signal of the subtractor 33 with a delta value that is smaller than the rate of change of the envelope signal that is input to the delta modulation circuit 31, and a quantization result that the quantizer 34 outputs. The adder 35 is configured to add the delta modulation prediction signal output from the delay device 32 and output the addition result as a new delta modulation prediction signal to the delay device 32.

In this embodiment, the number of receiving antennas is two, but it is also possible to use three or more as in the first embodiment.

The operation of the diversity device configured as above will be described below. First, the receiver 4 adjusts the gain and frequency of the signal received by the first antenna 1, and the analog quadrature detector 61 converts the adjusted reception signal into baseband I and Q signals. Next, after the converted I signal and Q signal are sampled by the A / D converter 5, adjacent interference waves are removed from the received signal for each of the I channel and Q channel through the root Nyquist digital filter 7. Next, the envelope signal is calculated from the output signal of the root Nyquist digital filter 7 by the envelope signal calculation digital circuit 9,
This envelope signal is requantized by the delta modulation circuit 31. In the delta modulation circuit 31, the subtractor 33 subtracts the delta modulation prediction signal held in the delay device 32 from the input envelope signal, and the quantizer 34 subtracts the subtraction result from the input envelope signal. Quantize with a delta value smaller than the rate. The quantized result is added to the output signal of the delay device 32 by the adder 35, and is held in the delay device 32 again as a new delta modulation prediction signal. This quantization operation is repeated until the reception operation of the first antenna 1 ends, and when the reception operation of the first antenna 1 ends, the output signal of the delay device 32 is held in the first storage circuit 11. , Reset the delay device 32.

Next, the antenna changeover switch 3 is changed over, the signal received by the second antenna 2 is adjusted in gain and frequency by the receiver 4, and then sampled by the A / D converter 5. Next, after the output signal of the A / D converter 5 is converted into a baseband I signal and a Q signal by the digital quadrature detector 6, it is converted from the received signal for each I channel and Q channel through the root Nyquist digital filter 7. Remove adjacent interference. Next, the envelope signal calculation digital circuit 9 calculates an envelope signal from the output signal of the root Nyquist digital filter 7, and the delta modulation circuit 31 requantizes the envelope signal. In the delta modulation circuit 31, the subtractor 33 subtracts the delta modulation prediction signal held in the delay device 32 from the input envelope signal, and the subtraction result is the signal change of the envelope signal input by the quantizer 34. Quantize with a delta value smaller than the rate. The quantized result is added to the output signal of the delay device 32 by the adder 35, and is held in the delay device 32 again as a new delta modulation prediction signal. This quantization operation is repeated until the reception operation of the second antenna 2 ends, and when the reception operation of the second antenna 2 ends, the output signal of the delay device 32 is held in the second memory circuit 12. , Reset the delay device 32. Next, the digital comparator 13 compares the delta modulation signal voltage levels of the reception signals received by the respective antennas held in the first storage circuit 11 and the second storage circuit 12.

The above processing is performed before the reception slot.
On the receiving slot side, the control circuit 14 selects the antenna having the higher delta modulation signal voltage level by the antenna changeover switch 3 based on the result of the digital comparator 13, and the received signal is received by the receiver 4, the analog quadrature detector 61, A
/ D converter 5, root Nyquist digital filter 7
And demodulating using the demodulator 8.

As described above, according to this embodiment, the first antenna 1, the second antenna 2, the receiver 4 of one system, the analog quadrature detector 61, the A / D converter 5, the root Nyquist digital filter 7 are provided. And TDM with demodulator 8
In the A-system data receiving device, a root Nyquist filter processing for removing an adjacent interfering wave after A / D conversion of a received signal, envelope signal calculation, delta modulation processing for removing envelope signal noise, and delta modulation signal comparison processing are performed. Since each is realized by digital signal processing, no adjustment step is required when manufacturing the adjacent interference wave removing means, and band limitation is performed by delta modulation processing that has poor tracking capability for envelope signals. , It is possible to perform high-quality diversity processing that is resistant to instantaneous fluctuations in the envelope signal.

The ninth embodiment of the present invention will be described below with reference to the drawings.

FIG. 9 is a block circuit diagram of a diversity apparatus according to the ninth embodiment of the present invention. The difference from the fourth embodiment is that the quadrature detection processing is processed by an analog signal. In FIG. 9, 1 is one first antenna of the two receiving antennas, 2 is the other second antenna of the two receiving antennas, 3 is the first antenna 1 or the second antenna 2, an antenna changeover switch which is an antenna changeover means for selecting and outputting any one of the received signals received by 2 is a reception which outputs by adjusting the gain and frequency of the reception signal output by the antenna changeover switch 3. The receiver is a means, 61 is an analog quadrature detector which is a quadrature detection means for converting a reception signal into an I signal and a Q signal and outputting the signal, and 5 is an analog quadrature detector 6.
A / that samples the I and Q signals output by 1
An A / D converter which is a D converting means, 7 is a root Nyquist digital filter which is an adjacent interfering wave removing means which removes an interference wave of a reception signal, and 8 is a signal which is demodulated and output from the signal output by the root Nyquist digital filter Demodulator,
Reference numeral 41 is a synchronizing circuit which is one of the envelope signal noise removing means for detecting the symbol identification point from the output signal of the root Nyquist digital filter 7 and outputting the detected timing, and 42 is the timing signal output by the synchronizing circuit 41. A decimation circuit which is one of the envelope signal noise removing means for outputting only the symbol identification point signal from the output signal of the root Nyquist digital filter 7 in synchronization with
Is an envelope signal calculation digital circuit which is an envelope signal calculation means for calculating and outputting an envelope signal from the symbol identification point signal output from the thinning circuit 42, and 11 is an envelope signal output from the envelope signal calculation digital circuit 9. A first memory circuit which is one of comparison means for holding an envelope signal obtained from a reception signal received by the first antenna 1 among the first storage circuit, 12
Is one of the comparing means for holding the envelope signal obtained from the received signal received by the second antenna 2 among the envelope signals output from the envelope signal calculation digital circuit 9;
And 13 is one of comparison means for comparing envelope signals composed only of the symbol identification point signals held in the first storage circuit 11 and the second storage circuit 12 and outputting a comparison result. A certain digital comparator 14 is a control circuit as a control means for switching the reception signal input to the antenna changeover switch 3 according to the comparison result output from the digital comparator 13. Although the number of receiving antennas is two in the present embodiment, the number of receiving antennas can be three or more as in the first embodiment.

The operation of the diversity device configured as above will be described below. First, the receiver 4 adjusts the gain and frequency of the signal received by the first antenna 1, and then the analog quadrature detector 61 converts the adjusted reception signal into baseband I and Q signals. next,
After the converted I and Q signals are sampled by the A / D converter 5, adjacent interference waves are removed from the received signal for each of the I and Q channels through the root Nyquist digital filter 7. Next, the synchronization circuit 41 detects the symbol identification point from the output signal of the root Nyquist digital filter 7 and outputs the synchronization signal synchronized with the detection timing to the thinning circuit 42. The thinning circuit extracts and outputs only the symbol identification point signal from the output signal of the root Nyquist digital filter 7 in accordance with the synchronizing signal output from the synchronizing circuit 41. Next, the envelope signal calculation digital circuit 9 calculates the envelope signal from the symbol identification point signal, and the voltage level of the envelope signal is held in the first storage circuit 11.

Then, the antenna changeover switch 3 is changed over, and the signal received by the second antenna 2 is adjusted by the receiver 4 in terms of gain and frequency.
Sampling is performed by the / D converter 5. Next, after converting the output signal of the A / D converter 5 into a baseband I signal and a Q signal by the digital quadrature detector 6, the I channel and the Q signal are passed through the root Nyquist digital filter 15.
Adjacent interference waves are removed from the received signal for each of the channels. Next, the synchronization circuit 41 detects the symbol identification point from the output signal of the root Nyquist digital filter 7 and outputs the synchronization signal synchronized with the detection timing to the thinning circuit 42. The decimation circuit extracts only the symbol identification point signal from the output signal of the root Nyquist digital filter 7 in accordance with the synchronization signal output from the synchronization circuit 41 and outputs it. Next, the envelope signal calculation digital circuit 9 from the symbol identification point signal. Then, the envelope signal is calculated according to, and the voltage level of the envelope signal is held in the second memory circuit 12.

Next, the digital comparator 13 compares the envelope signal voltage levels made up of only the symbol identification point signals received by the respective antennas held by the first memory circuit 11 and the second memory circuit 12. The above processing is performed before the reception slot.

Next, on the reception slot side, the control circuit 14 selects the antenna with the higher envelope signal voltage level by the antenna changeover switch 3 based on the result of the digital comparator 13, and selects the selected reception signal. Demodulation is performed using the receiver 4, the analog quadrature detector 61, the A / D converter 5, the root Nyquist digital filter 7, and the demodulator 8.

As described above, according to this embodiment, the first antenna 1, the second antenna 2, the receiver 4 of one system, the analog quadrature detector 61, the A / D converter 5, the root Nyquist digital filter 7 are provided. And TDM with demodulator 8
In the data receiving device by the A system, the received signal is A /
Since root Nyquist filter processing for removing adjacent interference waves after D conversion, envelope signal band limitation processing for removing envelope signal noise, envelope signal calculation, and envelope signal comparison processing are realized by digital signal processing, respectively. , An adjustment step is not required when manufacturing the adjacent interference wave removing means, and when comparing a plurality of received signals during operation,
Since only the symbol identification points are extracted and only the DC components are compared, it is possible to perform high-quality diversity processing that is resistant to instantaneous fluctuations in the envelope signal.

The tenth embodiment of the present invention will be described below with reference to the drawings.

FIG. 10 is a block circuit diagram of a diversity apparatus according to the tenth embodiment of the present invention. The difference from the fifth embodiment is that the quadrature detection processing is processed by an analog signal. In FIG. 10, 1 is one first antenna of the two receiving antennas, 2 is the other second antenna of the two receiving antennas, 3 is the first antenna 1 or the second antenna 2, an antenna changeover switch which is an antenna changeover means for selecting and outputting any one of the received signals received by 2 is a reception which outputs by adjusting the gain and frequency of the reception signal output by the antenna changeover switch 3. A receiver as means, 61 is an analog quadrature detector which is a quadrature detection means for converting a received signal into an I signal and a Q signal and outputting the sampled signal. A / D converter which is an A / D conversion means for performing the operation, 7 is a root Nyquist digital filter which is an adjacent interference wave removing means for removing an interference wave of a received signal, and 8 is a root ny The demodulator 41 demodulates and outputs the signal output from the digital filter 7, and 41 of the envelope signal noise removing means that detects the symbol identification point from the output signal of the root Nyquist digital filter 7 and outputs the detected timing. One of the synchronizing circuits, 42 is one of the envelope signal noise removing means for outputting only the symbol identification point signal from the output signal of the root Nyquist digital filter 7 in synchronization with the timing signal output from the synchronizing circuit 41. A certain decimation circuit, 9 is an envelope signal calculation digital circuit which is an envelope signal calculation means for calculating and outputting an envelope signal from the symbol identification point signal output from the decimation circuit 42, and 10 is an envelope signal calculation digital circuit 9. A band-limited digital filter which is one of noise removing means for the envelope signal to be output. , 11 is a first storage circuit which is one of comparison means for holding the envelope signal obtained from the received signal received by the first antenna 1 among the envelope signals output from the band-limited digital filter 10, 12 Is a second memory circuit which is one of comparison means for holding the envelope signal obtained from the reception signal received by the second antenna 2 among the envelope signals output by the band-limited digital filter 10, and 13 is the second storage circuit A digital comparator, which is one of comparison means for comparing the envelope signals composed only of the symbol identification point signals held in the first memory circuit 11 and the second memory circuit 12 and outputting the comparison result, It is a control circuit as a control means for switching the reception signal input to the antenna changeover switch 3 according to the comparison result output from the digital comparator 13. Although the number of receiving antennas is two in the present embodiment, the number of receiving antennas can be three or more as in the first embodiment.

The operation of the diversity device configured as above will be described below. First, the receiver 4 adjusts the gain and frequency of the signal received by the first antenna 1, and then the analog quadrature detector 61 converts the adjusted reception signal into baseband I and Q signals. next,
After the converted I and Q signals are sampled by the A / D converter 5, adjacent interference waves are removed from the received signal for each of the I and Q channels through the root Nyquist digital filter 7. Next, the synchronization circuit 41 detects the symbol identification point from the output signal of the root Nyquist digital filter 7 and outputs the synchronization signal synchronized with the detection timing to the thinning circuit 42. The thinning circuit extracts and outputs only the symbol identification point signal from the output signal of the root Nyquist digital filter 7 in accordance with the synchronizing signal output from the synchronizing circuit 41. Next, after the envelope signal calculation digital circuit 9 calculates the envelope signal from the symbol identification point signal, band limiting is performed through the band limiting digital filter 10 to set the voltage level of the envelope signal to the first storage circuit. Hold at 11.

Next, the antenna changeover switch 3 is changed over, the gain and frequency of the signal received by the second antenna 2 are adjusted by the receiver 4, and then A
Sampling is performed by the / D converter 5. Next, after converting the output signal of the A / D converter 5 into a baseband I signal and a Q signal by the digital quadrature detector 6, the I channel and the Q signal are passed through the root Nyquist digital filter 15.
Adjacent interference waves are removed from the received signal for each of the channels. Next, the synchronization circuit 41 detects the symbol identification point from the output signal of the root Nyquist digital filter 7 and outputs the synchronization signal synchronized with the detection timing to the thinning circuit 42. The decimation circuit extracts only the symbol identification point signal from the output signal of the root Nyquist digital filter 7 in accordance with the synchronization signal output from the synchronization circuit 41 and outputs it. Next, the envelope signal calculation digital circuit 9 from the symbol identification point signal. After calculating the envelope signal by, the band limiting is performed through the band limiting digital filter 10 and the voltage level of the envelope signal is held in the second memory circuit 12.

Next, the digital comparator 13 compares the envelope signal voltage levels consisting of only the symbol identification point signals received by the respective antennas held by the first memory circuit 11 and the second memory circuit 12. The above processing is performed before the reception slot.

Next, on the reception slot side, the antenna having the higher envelope signal voltage level is selected by the control circuit 14 by the antenna changeover switch 3 based on the result of the digital comparator 13, and the selected reception signal is selected. Demodulation is performed using the receiver 4, the analog quadrature detector 61, the A / D converter 5, the root Nyquist digital filter 7, and the demodulator 8.

As described above, according to this embodiment, the first antenna 1, the second antenna 2, the receiver 4 of one system, the digital quadrature detector 61, the A / D converter 5, the root Nyquist digital filter 7 are provided. And TD with demodulator 8
In the data receiving device by the MA method, the received signal is A
Root Nyquist filter processing for removing adjacent interference waves after D / D conversion, envelope signal band limitation processing for removing envelope signal noise, envelope signal calculation, and envelope signal comparison processing are realized by digital signal processing, respectively. Therefore, an adjusting step is not required when manufacturing the adjacent interference wave removing means, and when comparing a plurality of received signals during operation, only the symbol identification points are extracted to make only the DC component,
Further, since the DC component is filtered, it is possible to perform high-quality diversity processing that is more resistant to instantaneous fluctuations in the envelope signal.

[0101]

As described above, according to the diversity device according to the invention of claims 1, 2 or 6, 7, the A / D
Since the conversion means digitizes the received analog signal,
Since the adjacent interference wave removing means, the envelope signal calculating means, the envelope signal noise removing means and the comparing means can process the received signal as a digital signal, an adjustment step at the time of manufacturing is unnecessary.

Further, since the digitally processed adjacent interfering wave removing means and the envelope signal noise removing means are provided, it is possible to prevent a malfunction at the time of selecting an antenna due to a momentary fluctuation of the received envelope signal. Therefore, highly accurate reception quality can be obtained.

According to the diversity device of the third aspect of the present invention, since the root Nyquist digital filter is used as the adjacent interfering wave removing means, the variation due to the element can be ignored as compared with the conventional root Nyquist analog filter. The adjustment process at the time of manufacturing becomes unnecessary.
Further, since the mounting area is small and the cost is low, the price of the portable communication device can be reduced.

Further, since the band-limited digital filter is used as the envelope signal noise removing means, noise due to a momentary fluctuation of the received envelope signal can be removed, so that it is possible to surely prevent a malfunction during antenna selection. Therefore, it is possible to obtain highly accurate reception quality.

According to the diversity device of the fourth aspect of the present invention, since the root Nyquist digital filter is used as the adjacent interfering wave removing means, the variation due to the element can be ignored as compared with the conventional root Nyquist analog filter. The adjustment process at the time of manufacturing becomes unnecessary.
Further, since the mounting area is small and the cost is low, the price of the portable communication device can be reduced.

Furthermore, since the digital comparator and the counter are used as the envelope signal noise removing means, when comparing the voltage levels of a plurality of received signals, only the number of samples larger than a predetermined threshold value is compared. Since the noise due to the instantaneous fluctuation of the reception envelope signal can be removed, the malfunction at the time of selecting the antenna can be surely prevented, and the highly accurate reception quality can be obtained.

According to the diversity apparatus of the fifth aspect of the present invention, since the root Nyquist digital filter is used as the adjacent interfering wave removing means, the variation due to the element can be ignored as compared with the conventional root Nyquist analog filter. The adjustment process at the time of manufacturing becomes unnecessary.
Further, since the mounting area is small and the cost is low, the price of the portable communication device can be reduced.

Further, since the delta modulation circuit is used as the envelope signal noise removing means, it does not follow the received envelope signal, so that noise due to momentary fluctuations of the received envelope signal can be removed. It becomes possible to reliably prevent a malfunction at the time of selection, and it is possible to obtain highly accurate reception quality.

According to the diversity device of the eighth aspect of the present invention, since the root Nyquist digital filter is used as the adjacent interfering wave removing means, the variation due to the element can be ignored as compared with the conventional root Nyquist analog filter. The adjustment process at the time of manufacturing becomes unnecessary.
Further, since the mounting area is small and the cost is low, the price of the portable communication device can be reduced.

Further, since the synchronizing circuit and the thinning circuit are used as the envelope signal noise removing means, when comparing the voltage levels of a plurality of received signals, the symbol identification point signal is extracted and only the DC component is compared. Since it is possible to remove noise due to instantaneous fluctuations of the reception envelope signal, it becomes possible to reliably prevent malfunctions when selecting the antenna,
Highly accurate reception quality can be obtained.

According to the diversity device of the ninth aspect, since the envelope signal noise removing means further includes a band limiting digital filter, the noise of the DC component obtained by extracting the symbol identification point signal is reduced. Since it can be removed, more accurate reception quality can be obtained.

[Brief description of drawings]

FIG. 1 is a block circuit diagram of a diversity device according to a first embodiment of the present invention.

FIG. 2 is a block circuit diagram of a diversity device according to a second embodiment of the present invention.

FIG. 3 is a block circuit diagram of a diversity device according to a third embodiment of the present invention.

FIG. 4 is a block circuit diagram of a diversity device according to a fourth embodiment of the present invention.

FIG. 5 is a block circuit diagram of a diversity device according to a fifth embodiment of the present invention.

FIG. 6 is a block circuit diagram of a diversity device according to a sixth embodiment of the present invention.

FIG. 7 is a block circuit diagram of a diversity device according to a seventh embodiment of the present invention.

FIG. 8 is a block circuit diagram of a diversity device according to an eighth embodiment of the present invention.

FIG. 9 is a block circuit diagram of a diversity device according to a ninth embodiment of the present invention.

FIG. 10 is a block circuit diagram of a diversity device according to a tenth embodiment of the present invention.

FIG. 11 is a block circuit diagram of a conventional diversity device.

[Explanation of symbols]

 1 1st antenna 2 2nd antenna 3 Antenna changeover switch 4 Receiver 5 A / D converter 6 Digital quadrature detector 7 Root Nyquist digital filter 8 Demodulator 9 Envelope signal calculation digital circuit 10 Band limiting digital filter 11 1st 1 memory circuit 12 2nd memory circuit 13 digital comparator 14 control circuit 21 first digital comparator 22 counter 23 second digital comparator 31 delta modulation circuit 32 delay device 33 subtractor 34 quantizer 35 adder 41 synchronization circuit 42 thinning circuit 61 analog quadrature detector 101 first antenna 102 second antenna 103 antenna changeover switch 104 receiver 105 root Nyquist analog filter 106 analog quadrature detector 107 A / D converter 108 demodulator 109 Envelope signal calculation analog circuit 110 First sample and hold circuit 111 Second sample and hold circuit 112 Analog comparator 113 Control circuit

Claims (9)

[Claims] 1. A plurality of receiving antennas, an antenna switching unit that selects and outputs one received signal from the received signals received by the plurality of receiving antennas, and a received signal output by the antenna switching unit. Receiving means for adjusting and outputting gain and frequency, and A / D for sampling the signal output by the receiving means
Conversion means, quadrature detection means for converting the digital signal output from the A / D conversion means into an I signal and a Q signal and outputting the I signal and the Q signal, and an interference wave of the I signal and the Q signal output from the quadrature detection means. Adjacent interference wave removing means for removing and outputting respectively, envelope signal calculating means for calculating and outputting an envelope signal from the signal output by the adjacent interference wave removing means, and envelope output by the envelope signal calculating means Envelope signal noise removing means for removing the noise of the line signal and outputting, and comparing means for holding the signals output by the envelope signal noise removing means for each of the receiving antennas and comparing them respectively, and outputting a comparison result. And a control unit that switches the antenna switching unit based on a comparison result output from the comparison unit. 2. A plurality of receiving antennas, an antenna switching unit that selects and outputs one received signal from the respective received signals received by the plurality of receiving antennas, and a received signal output by the antenna switching unit. Receiving means for adjusting and outputting gain and frequency, quadrature detecting means for converting the signal output by the receiving means into I signal and Q signal and outputting, I signal and Q output by the quadrature detecting means A / D conversion means for sampling each signal, adjacent interference wave removal means for removing and outputting the interference wave of each digital signal output by the A / D conversion means, and output for the adjacent interference wave removal means An envelope signal calculating means for calculating and outputting an envelope signal from a signal, and an envelope for removing noise from the envelope signal output by the envelope signal calculating means and outputting the envelope signal. No. noise removing means, comparing the signals output by the envelope signal noise removing means for each of the receiving antennas and then comparing the output signals, and outputting comparison results based on the comparison results output by the comparing means. And a control means for switching the antenna switching means. 3. The diversity apparatus according to claim 1, wherein the adjacent interference wave removing means is a root Nyquist digital filter, and the envelope signal noise removing means is a band-limited digital filter. 4. The adjacent interfering wave removing means is a root Nyquist digital filter, and the envelope signal noise removing means is a digital comparator which outputs a result by comparing with a predetermined threshold value, and the digital comparator. 3. The diversity device according to claim 1, further comprising a counter that counts the output comparison result. 5. The adjacent interference wave removing means is a root Nyquist digital filter, and the envelope signal noise removing means is a delta modulation circuit for requantizing with a delta value smaller than the signal change rate of the envelope signal. The diversity device according to claim 1 or 2, wherein the diversity device is provided. 6. A plurality of receiving antennas, an antenna switching unit that selects and outputs one received signal of the respective received signals received by the plurality of receiving antennas, and a received signal output by the antenna switching unit. Receiving means for adjusting and outputting gain and frequency, and A / D for sampling the signal output by the receiving means
Conversion means; quadrature detection means for converting the digital signal output from the A / D conversion means into an I signal and a Q signal and outputting the I signal and the Q signal; and an interference wave of the I signal and the Q signal output from the quadrature detection means. Adjacent interference wave removing means for removing and outputting respectively, envelope signal noise removing means for removing noise before outputting an envelope signal from the signal output by the adjacent interference wave removing means, and the envelope An envelope signal calculation means for calculating and outputting an envelope signal from the signal output by the signal noise removing means, and an envelope signal output by the envelope signal calculating means is held for each of the receiving antennas and then compared with each other. And a comparison means for outputting a comparison result, and a control means for switching the antenna switching means based on the comparison result output by the comparison means. Bashichi apparatus. 7. A plurality of receiving antennas, an antenna switching unit that selects and outputs one received signal of the respective received signals received by the plurality of receiving antennas, and a received signal output by the antenna switching unit. Receiving means for adjusting and outputting gain and frequency, quadrature detecting means for converting the signal output by the receiving means into an I signal and a Q signal and outputting the I signal and the Q signal, and I signal and Q output by the quadrature detecting means. A / D conversion means for sampling each signal, adjacent interference wave removal means for removing and outputting the interference wave of each digital signal output by the A / D conversion means, and the adjacent interference wave removal means for output Envelope signal noise removing means for removing noise and outputting it before calculating the envelope signal from the signal, and an envelope signal from the signal output by the envelope signal noise removing means. Envelope signal calculating means for calculating and outputting a line signal, and comparing the envelope signal output by the envelope signal calculating means for each of the receiving antennas after each comparison, comparing means for outputting a comparison result, A diversity device comprising: a control unit that switches the antenna switching unit based on a comparison result output by the comparison unit. 8. The adjacent interference wave removing means is a root Nyquist digital filter, and the envelope signal noise removing means symbolizes a signal output from the root Nyquist digital filter connected in parallel with the root Nyquist digital filter. A synchronization circuit that detects an identification point and outputs a synchronization signal synchronized at the time of detection, and a decimation that extracts a symbol identification point signal from the signal output by the root Nyquist digital filter based on the synchronization signal output by the synchronization circuit. The diversity device according to claim 6 or 7, comprising a circuit. 9. The envelope signal noise removing means further comprises a band-limited digital filter connected between the envelope signal calculating means and the comparing means. The described diversity device.