WO2018179114A1

WO2018179114A1 - Wireless device and wireless noise measurement method

Info

Publication number: WO2018179114A1
Application number: PCT/JP2017/012773
Authority: WO
Inventors: 中谷　勇太
Original assignee: 富士通株式会社
Priority date: 2017-03-28
Filing date: 2017-03-28
Publication date: 2018-10-04
Also published as: JP6791363B2; JPWO2018179114A1

Abstract

A wireless device (100) comprises: an antenna (104) for transmitting and receiving wireless radio waves by using the same frequency bandwidth as in other systems; a baseband unit (110) for performing signal processing on signals to be transmitted and received; a transmission unit (101) for converting a signal output from the baseband unit (110) into a wireless signal and outputting the wireless signal to the antenna (104); a reception unit (102) for converting a signal received by the antenna (104) into a wireless signal and outputting the wireless signal to the baseband unit (110); a circulator (103) for outputting the wireless signal transmitted and output by the transmission unit (101) to the antenna (104) and outputting the wireless signal received by the antenna (104) to the reception unit (102); and a noise signal measurement unit (105) for measuring power of a wireless signal received in the same frequency bandwidth as that of a transmitted wireless signal in a period during which the wireless signal is transmitted by the transmission unit (101) while eliminating influence of leakage of the wireless signal transmitted by the transmission unit (101) into the reception unit (102).

Description

Wireless device and wireless noise measuring method

The present invention relates to a wireless device that performs wireless communication and a wireless noise measurement method.

There are a plurality of systems using the same frequency in the Industrial Science and Medical (ISM: Industry Science Medical) band. For example, the 2.4 GHz band includes Wi-Fi (registered trademark), Bluetooth (registered trademark), mobile router, amateur radio, and the like. The 5 GHz band includes Wi-Fi, various radars such as weather, amateur radio, and the like.

The ISM band does not require a radio station license or radio wave usage fee, and the number of systems using this ISM band is increasing year by year. The systems may coexist without causing interference with each other at the same frequency of the ISM band. Desired. In order to grasp the state of interference, it is necessary to measure continuous radio waves for a certain period of time.

Conventionally, there has been a technique for measuring a received signal strength and selecting a use candidate channel with a minimum interference effect in order to grasp the interference radio wave strength (see, for example, Patent Document 1 below). Moreover, instead of the configuration in which transmission and reception are switched by a switch, there is a technique in which an access point arranges a circulator between a transmission unit and a reception unit, and both transmission and reception are shared by antennas (for example, see

Patent Documents

2 and 3 below). ).

JP 2008-78698 A JP 2013-121091 A JP 2005-184863 A

However, it is difficult to grasp the status of other systems during the time zone when the device is transmitting at the same frequency. During the reception period of its own device, signals from other systems can be received and signals transmitted by other systems can be measured. However, during the transmission period of the own device, the signal transmitted by the other system is buried in the transmission signal of the own device, and the signal transmitted by the other system cannot be measured. For this reason, it was not possible to grasp the state of interference in the time zone in which the above-described own system is transmitting.

In order to grasp the influence of interference and noise on its own device, it is necessary to measure radio waves continuously for a certain period of time, to statistically analyze the power status of interference and noise, and to take measures based on the statistical information. However, conventionally, since the interference and noise from other systems cannot be measured during the transmission period of the own apparatus, information for statistics is insufficient and sufficient measures cannot be taken.

In one aspect, an object of the present invention is to be able to receive a signal even during signal transmission and to measure interference with other devices.

In one proposal, the wireless device is a wireless device that uses the same frequency band as other systems, and includes an antenna that transmits and receives wireless radio waves, a baseband unit that performs signal processing of signals that are transmitted and received, and the baseband unit The transmitter that converts the signal output from the antenna into a radio signal and outputs it to the antenna, the receiver that converts the radio signal received by the antenna into a signal and outputs the signal to the baseband unit, and the transmitter that transmits The circulator for outputting the radio signal to the antenna and outputting the radio signal received by the antenna to the receiver, and the influence of leakage of the radio signal transmitted by the transmitter to the reception side is eliminated. The noise signal measuring unit that measures the power of the radio signal received in the same frequency band as the radio signal transmitted during the transmission of the radio signal by the transmitter , It is a requirement to have a.

According to one embodiment, the wireless device can receive a signal even during signal transmission and can measure interference with other devices.

FIG. 1 is a block diagram of a configuration example of the radio apparatus according to the first embodiment. FIG. 2 is a diagram illustrating a hardware configuration example of a control unit of the radio apparatus according to the first embodiment. FIG. 3 is a diagram illustrating a power spectrum of the wireless device according to the first embodiment. FIG. 4 is a diagram for explaining processing of the noise signal measurement unit of the radio apparatus according to the first embodiment. FIG. 5 is a flowchart illustrating a processing procedure of noise signal measurement of the wireless device according to the first embodiment. FIG. 6 is a diagram for explaining processing of the noise signal measurement unit of the radio apparatus according to the second embodiment. FIG. 7 is a flowchart illustrating a processing procedure of noise signal measurement of the radio apparatus according to the second embodiment. FIG. 8 is a diagram showing various systems using the ISM band. FIG. 9 is a diagram for explaining that it is difficult to grasp the interference of another system using the existing technology. FIG. 10 is a block diagram illustrating a configuration example of a wireless device according to an existing technology.

(Embodiment 1)
FIG. 1 is a block diagram of a configuration example of the radio apparatus according to the first embodiment. As shown in FIG. 1A, the wireless device 100 includes a transmission unit 101, a reception unit 102, a circulator 103, an antenna 104, a noise signal measurement unit 105, and a baseband unit (BB) 110. Including.

The transmission unit 101 converts the baseband signal input from the baseband unit 110 into a high-frequency (radio band, RF: Radio Frequency) signal (radio signal), and wirelessly transmits the signal from the antenna 104 via the circulator 103. The transmission unit 101 includes an amplifier (PA: PowerAmp) 114, and the PA 114 amplifies an analog signal to be wirelessly transmitted.

The receiving unit 102 converts the radio signal received by the antenna 104 and output via the circulator 103 into a baseband signal and outputs the signal to the baseband unit 110. The receiving unit 102 includes a canceller 121 and an amplifier (LNA: LowNoiseAmp) 122. The radio wave received by the antenna 104 is output to the canceller 121 via the circulator 103. The LNA 122 amplifies the received signal and outputs it to the baseband (BB) unit 110.

The baseband unit 110 performs signal processing on a device that the wireless device 100 transmits and receives. The baseband unit 110 includes a modulator 111, a digital-analog converter (DAC) 112, and an oscillator 113 as a configuration for processing a transmission signal.

The modulator 111 digitally modulates a digital transmission signal according to a predetermined wireless system. The DAC 112 is supplied with the oscillation signal of the oscillator 113, and converts a digital signal to be wirelessly transmitted into an analog signal.

The baseband unit 110 includes an analog-digital converter (ADC) 123, a canceller 124, and a demodulator 125 as a configuration for processing a received signal.

The ADC 123 is supplied with the oscillation signal from the oscillator 113 and converts the received signal from an analog signal to a digital signal. The canceller 124 outputs the reception signal output from the ADC 123 to the demodulator 125, and cancels the leakage of the transmission signal from the transmission unit 101, the modulator 111, and the like included in the reception signal. The demodulator 125 demodulates the received signal.

The

cancellers

121 and 124 suppress (remove) leakage of transmission signals from the transmission unit 101 to the reception unit 102 side. The canceller 121 outputs the reception signal output from the circulator 103 to the LNA 122 and cancels the leakage of the transmission signal of the transmission unit 101 (PA 114 or the like) included in the reception signal to the reception unit 102 via the circulator 103. .

The

cancellers

121 and 124 receive a transmission / reception signal on the + side, receive a cancellation signal on the − side, suppress the cancellation signal, and output a transmission / reception signal.

As shown in FIG. 1B, the circulator 103 outputs the input of the port 1 to the port 2 and outputs the input of the port 2 to the port 3 (forward direction). Further, the output of the port 2 in the reverse direction, for example, is not output to the port 1. As shown in FIG. 1A, the circulator 103 connects the PA 114 of the transmission unit 101 to the port 1, connects the antenna 104 to the port 2, and connects the LNA 122 (canceller 121) of the reception unit 102 to the port 3. .

The power of the transmission signal is, for example, 100,000 times higher than the power of the reception signal. For this reason, the transmission signal of the transmission part 101 leaks into the receiving part 102 side via the circulator 103 grade | etc.,. The

cancellers

121 and 124 suppress the reception signal from being buried due to the noise of the transmission signal.

In Embodiment 1, the circulator 103 and the two-

stage cancellers

121 and 124 are used in combination. As a result, even during a period in which the transmission unit 101 transmits and transmits a transmission signal, the reception unit 102 receives a signal from another external system and prevents the reception signal from being buried by the transmission signal. Can be received.

The noise signal measuring unit 105 receives the output of the received signal from the canceller 124, and measures a noise signal such as interference / noise power that other systems affect the own device based on the received signal. Here, in the noise signal measurement unit 105, the

cancellers

121 and 124 suppress the influence of the transmission signal on the transmission unit 101 side. Thereby, the radio | wireless apparatus 100 can suppress the influence of the transmission signal which self-apparatus is transmitting, can receive the signal used as interference and noise which another system transmits, and can measure the electric power of the received signal. .

FIG. 2 is a diagram illustrating a hardware configuration example of a control unit of the wireless device according to the first embodiment. Although not shown in FIG. 1, in the wireless device 100, the control unit 200 shown in FIG. And this control part 200 performs the function of the noise signal measurement of the noise signal measurement part 105 of FIG.

2. A CPU (Central Processing Unit) 201 shown in FIG. 2 reads and executes a program stored in the memory 202, and at this time, a part of the area of the memory 202 is used as a work area. As a result, the radio apparatus 100 can be controlled in an integrated manner, and the function of the noise signal measuring unit 105 in FIG. 1 can be realized. As the memory 202, ROM, RAM, or the like can be used. Further, an extended memory 203 such as an HDD or a flash memory can be used for a data storage area or the like. Reference numeral 204 denotes a bus.

The wireless communication unit 205 realizes functions related to wireless communication of the transmission unit 101 and the reception unit 102 in FIG. A communication interface (I / F) unit 206 realizes a function of a communication interface with an external device, and outputs, for example, a measurement result of the noise signal measurement unit 105 to the external device. The interference / noise power measured by the noise signal measuring unit 105 can be stored in the memory 202 or the extended memory 203 functioning as a storage unit.

The modulator 111 and the DAC 112, the ADC 123, the canceller 124, and the demodulator 125 shown in FIG. 1 perform baseband (BB) band signal processing, and can be realized by, for example, an IC that integrates these functions. The PA 114 of the transmission unit 101, the canceller 121 and the LNA 122, and the circulator 103 of the reception unit 102 shown in FIG. 1 perform radio band (RF) signal processing, and can be realized by, for example, an IC that integrates these functions. .

FIG. 3 is a diagram illustrating a power spectrum of the wireless device according to the first embodiment. The horizontal axis represents frequency (frequency band for one channel), and the vertical axis represents power. 3A shows a power spectrum when the wireless device 100 transmits a transmission signal, and FIG. 3B shows a power spectrum when the wireless device 100 receives a signal.

As shown in FIG. 3A, the transmission unit 101 transmits a transmission signal SD within a predetermined transmission data band fs. Further, as shown in FIG. 3B, the received signal RD from another external system that causes interference and noise has a frequency band of one entire channel.

In the first embodiment, in the current technology, based on the assumption that the transmission signal SD transmitted by the transmission unit 101 leaks to the reception unit 102, a signal (reception signal) that causes interference and noise from other systems using the null band fn. RD) power is measured. The null band fn is a band located on both sides of the transmission data band fs in the frequency band for one channel.

FIG. 4 is a diagram for explaining the processing of the noise signal measurement unit of the wireless device according to the first embodiment. As shown in FIG. 4A, the noise signal measurement unit 105 includes a frequency conversion unit (FFT: Fast Fourier Transform) 400, a power measurement unit 1 (401), and a power measurement unit 2 (402). .

The FFT 400 converts the power of the received signal output from the canceller 124 into the frequency axis shown in FIG. 4B by Fourier transform. The FFT 400 outputs the received signal after frequency conversion to the power measurement unit 1 (401) when the own device is receiving, and after frequency conversion to the power measurement unit 2 (402) when the own device is transmitting. The received signal is output.

The power measuring unit 1 (401) measures the power of the transmission data band fs + null band fn, which is the entire frequency band for one channel received by the receiving unit 102 of the wireless device 100. FIG. 4B shows a null band fn and a transmission data band fs in a frequency band for one channel.

The power measuring unit 2 (402) measures the power of the null band fn in the frequency band for one channel while the device is transmitting. In the first embodiment, two stages of

cancellers

121 and 124 are provided, but at the time of transmission, a part of the transmission signal SD transmitted in the transmission data band fs is transmitted to the reception unit 102 side by the transmission unit 101 via the circulator 103 or the like. It is assumed that it leaks (see FIG. 3A). For this reason, in the first embodiment, during the transmission of the own apparatus, the power of the null band fn excluding the transmission signal SD of the transmission data band fs is obtained as the interference / noise power.

In the above description, the two power measuring units 1 and 2 (401 and 402) are provided, but the present invention is not limited to this. A single power measuring unit 401 is used to measure the power of the transmission data band fs + null band fn, which is the entire frequency band for one channel at the time of reception, and switch to measure the power of the null band fn at the time of transmission of the own apparatus. You may go.

The electric power by the electric power measurement part 1 (401) and the electric power measurement part 2 (402) is calculated | required by squaring the signal after FFT, and taking the average (following formula (1)).

FIG. 5 is a flowchart illustrating a processing procedure of noise signal measurement of the wireless device according to the first embodiment. For example, the processing content of the CPU 201 that realizes the function of the noise signal measurement unit 105 is shown.

The noise signal measurement unit 105 converts the frequency of the received signal by the frequency conversion unit 400 (step S501). Next, the noise signal measurement unit 105 determines whether or not the own device is transmitting a transmission signal (step S502). If the own apparatus is transmitting (step S502: Yes), the process proceeds to step S503. If the own apparatus is not transmitting (step S502: No), the process proceeds to step S504.

In step S503, since the own apparatus is transmitting, the noise signal measuring unit 105 measures the power of the null band fn by the power measuring unit 2 (402) (see step S503, FIG. 3A). Then, the measured power of the null band fn is stored in the storage unit as interference / noise power (step S505), and the above processing is terminated. The storage unit is the memory 202 or the extended memory 203 shown in FIG. 2, and can accumulate interference and noise power.

In step S504, since the own apparatus is not transmitting, the noise signal measurement unit 105 measures the power of the transmission data band fs + null band fn by the power measurement unit 1 (401) (see step S504, FIG. 3B). ). Then, the measured power of the transmission data band fs + null band fn is stored as interference / noise power in the storage unit (step S505), and the above processing is terminated.

According to the first embodiment described above, the circulator is used to enable the device to receive a signal even during transmission of the transmission signal. During transmission of the transmission signal, the power of the null band received from the outside is obtained, and this power is measured as interference / noise power. Further, while the receiving apparatus is receiving the received signal, the power of the transmission data band + null band, that is, the frequency band for one channel is obtained, and this power is measured as interference / noise power.

According to the first embodiment, even when the device itself is transmitting a transmission signal, it can receive interference and noise from other systems by receiving radio waves of the same frequency transmitted by other external systems. Become. At this time, even if the transmission signal being transmitted leaks to the receiving unit, the leakage amount, that is, the power of the null band excluding the transmission data band of the transmission signal is measured, so that it depends on the radio wave transmitted by another external system. Interference and noise power can be measured.

As described above, according to the first embodiment, it is possible to measure interference / noise from other systems during the transmission of the own apparatus in addition to the reception of the own apparatus, that is, the entire continuous period in which the own apparatus operates. Become. The measured interference / noise power over the entire period can be accumulated and stored in the storage unit, and can be used as interference / noise statistical information for the device itself. As a result, sufficient statistical information can be obtained, the influence of interference and noise by other systems using the same frequency can be accurately grasped, and appropriate measures can be taken.

For example, by analyzing statistical information, the period predicted by the other system to transmit is the setting of the period in which the own apparatus does not transmit a transmission signal. It becomes possible to set the period for transmitting the transmission signal. As a result, the own apparatus and other systems can efficiently use the same frequency band, and can coexist with many systems using the same frequency band.

(Embodiment 2)
The first embodiment has been described on the assumption that the transmission signal of the radio apparatus 100 leaks into the reception unit 102. In Embodiment 2, interference / noise power measurement based on the premise that a transmission signal of radio apparatus 100 does not leak into reception section 102 will be described.

The configuration of radio apparatus 100 of the second embodiment is basically the same as the configuration described in the first embodiment (FIG. 1). For example, it can be expected that the transmission signal will not leak into the receiving unit as the performance of the

cancellers

121 and 124 is improved and countermeasures against leakage of the transmission signal proceed in the future.

FIG. 6 is a diagram for explaining the processing of the noise signal measurement unit of the radio apparatus according to the second embodiment. As shown in FIG. 6A, the noise signal measurement unit 105 includes a frequency conversion unit (FFT: Fast Fourier Transform) 400 and a power measurement unit 601.

FFT 400 converts the reception signal output from canceller 124 to the frequency axis shown in FIG. 6B, as in the first embodiment (see FIG. 4).

The power measurement unit 601 measures the power of the transmission data band fs + null band fn, which is the entire frequency band for one channel, regardless of whether the wireless device 100 is transmitting or receiving transmission data. FIG. 6B shows a null band fn and a transmission data band fs in a frequency band for one channel.

As described above, in the second embodiment, the power measurement unit 601 performs the entire channel on the premise that the transmission signal SD of the transmission data band fs does not leak into the reception unit 102 during transmission in addition to reception by the own apparatus. Is obtained as interference / noise power.

FIG. 7 is a flowchart showing a processing procedure of noise signal measurement of the wireless device of the second embodiment. For example, the processing content of the CPU 201 that realizes the function of the noise signal measurement unit 105 is shown.

The noise signal measurement unit 105 performs frequency conversion of the power of the received signal by the frequency conversion unit 400 (step S701). Next, the noise signal measurement unit 105 measures the power of the transmission data band fs + null band fn by the power measurement unit 601 regardless of whether the own apparatus is transmitting a transmission signal or receiving a reception signal (step S702). FIG. 3B). Then, the measured power of the transmission data band fs + null band fn is stored as interference / noise power in the storage unit (step S703), and the above process is terminated.

According to the second embodiment described above, the transmission signal being transmitted by the own apparatus does not leak into the reception unit. For this reason, in any period during signal transmission and reception, power is obtained by effectively using the transmission data band + null band, that is, the entire frequency band for one channel, and this power is used as interference / noise power. taking measurement.

According to the second embodiment, the transmission signal does not leak into the reception unit regardless of whether or not the device itself is transmitting the transmission signal. For this reason, it becomes possible to measure the interference / noise power due to the radio wave transmitted by another external system by measuring the power of the received signal during all the transmission and reception periods of the device itself.

As described above, according to the second embodiment, it becomes possible to measure interference / noise from other systems in the entire continuous period in which the own apparatus operates. The measured interference / noise power over the entire period can be accumulated and stored in the storage unit, and can be used as interference / noise statistical information for the device itself. As a result, sufficient statistical information can be obtained, the influence of interference and noise by other systems using the same frequency can be accurately grasped, and appropriate measures can be taken.

(Contrast with existing technology)
Next, the existing technology will be described and compared with the above embodiments. FIG. 8 is a diagram showing various systems using the ISM band. The horizontal axis is frequency. There are multiple systems using the same frequency in the ISM band. For example, the 2.4 GHz band includes Wi-Fi (registered trademark), Bluetooth (registered trademark), mobile router, amateur radio, medical microwave heating device, microwave oven, and the like. The 5 GHz band includes Wi-Fi, various radars such as weather, fixed / search satellites, radio astronomy, microwave landing guidance, aeronautical radio navigation, amateur radio, and the like.

The ISM band does not require a radio station license or radio wave usage fee, and the number of systems using this ISM band is increasing year by year. The systems may coexist without causing interference with each other at the same frequency of the ISM band. Desired. In order to grasp the state of interference, it is necessary to measure continuous radio waves for a certain time and create statistical information and the like.

FIG. 9 is a diagram for explaining that it is difficult to grasp the interference of other systems using existing technology. The horizontal axis is time, and the vertical axis is power level. As shown in FIG. 9A, during the reception period of the own apparatus, signals from other systems can be received and signals transmitted by other systems (reception signal RD in the figure) can be measured. The received signal RD includes a signal that causes interference and noise other than the signal transmitted to the own apparatus.

However, during the transmission period of the own device shown in FIG. 9B, the signal (reception signal RD) from the other system is buried in the transmission signal SD transmitted by the own device, and the received signal from the other system. RD cannot be measured. For this reason, it was not possible to grasp the state of interference in the time zone in which the above-described own system is transmitting.

Therefore, with the existing technology, in order to grasp the influence of interference and noise on the device itself, it was not possible to measure the radio wave continuously for a certain period of time and statistically analyze the power status of the interference and noise. In other words, the existing technology cannot measure interference and noise from other systems during the transmission period of its own device, so there is not enough information for statistics and sufficient measures cannot be taken. .

FIG. 10 is a block diagram illustrating a configuration example of a wireless device according to the existing technology. The wireless device 1000 includes a transmission unit 1001, a switch 1002, an antenna 1003, a reception unit 1004, and a digital signal processing unit 1005.

When transmitting a signal, the wireless device 1000 performs wireless transmission processing on the transmission signal subjected to signal processing by the digital signal processing unit 1005 by the transmission unit 1001, switches the switch 1002, and transmits the signal from the antenna 1003 by wireless radio waves. At the time of signal reception, the radio wave received by the antenna 1003 is output to the receiving unit 1004 by switching the switch 1002 to perform reception processing, and the digital signal processing unit 1005 performs signal processing.

For example, the wireless device 1000 such as a wireless LAN switches the signal transmission / reception with the switch 1002 as shown in FIG. For this reason, it is a structure which cannot receive the signal of another system, transmitting the signal of an own apparatus.

On the other hand, the radio apparatus of each embodiment uses a circulator and can receive a signal even when the apparatus itself is transmitting a transmission signal. Then, during transmission of the transmission signal, the noise signal measurement unit obtains the power of the null band received from the outside, and measures this power as interference / noise power. Further, while the receiving apparatus is receiving the received signal, the power of the transmission data band + null band, that is, the frequency band for one channel is obtained, and this power is measured as interference / noise power.

As described above, according to the embodiment, even when the device itself is transmitting a transmission signal, interference / noise from other systems can be measured by receiving radio waves transmitted by other external systems. At this time, even if the transmission signal being transmitted leaks to the receiving unit, the leakage amount, that is, the power of the null band excluding the transmission data band of the transmission signal is measured, so that it depends on the radio wave transmitted by another external system. Interference and noise power can be measured.

Therefore, according to the embodiment, it is possible to measure interference / noise from other systems during the transmission of the own apparatus in addition to the reception of the own apparatus, that is, the entire continuous period in which the own apparatus operates. The measured interference / noise power over the entire period can be accumulated and stored in the storage unit, and can be used as interference / noise statistical information for the device itself. Thereby, sufficient statistical information can be obtained, the influence of interference and noise by other systems using the same frequency can be accurately grasped, and appropriate measures can be taken.

For example, a period in which the own apparatus does not transmit a transmission signal is set as a period predicted by another system to transmit by analyzing statistical information. On the contrary, the period during which the own apparatus transmits a transmission signal is set as the period during which the other system does not transmit. As a result, the same frequency band can be used efficiently with other systems, and it can coexist with many systems that use the same frequency band.

As described above, according to each embodiment, it is possible to measure the power of another system as an interference source and noise source with a simple configuration, and not affected by interference and noise from other systems using the same frequency. Wireless communication can be performed. At the same time, communication that becomes an interference source and a noise source can be prevented with respect to another system in which the device itself uses the same frequency.

The wireless device described in each embodiment can be applied to various devices that use the same frequency such as the ISM band shown in FIG. 8 for wireless communication, such as a Wi-Fi wireless LAN access point.

Also, in each of the above embodiments, an example using a circulator has been described. However, similar effects can be obtained by using a transmission / reception simultaneous distributor having a function capable of simultaneously transmitting and receiving signals.

The wireless noise measurement method described in the present embodiment can be realized by executing a control program prepared in advance by a computer (CPU or the like) of the target device (the wireless device). This control program is recorded on a computer-readable recording medium such as a magnetic disk, an optical disk, or a USB (Universal Serial Bus) flash memory, and is executed by being read from the recording medium by the computer. The control program may be distributed via a network such as the Internet.

DESCRIPTION OF SYMBOLS 100 Radio apparatus 101 Transmission part 102 Reception part 103 Circulator 104 Antenna 105 Noise signal measurement part 110 Baseband (BB) part 111 Modulator 113 Oscillator 114 PA
121,124 Canceller 122 LNA
123 DAC
125 demodulator 200 control unit 201 CPU
202 Memory 400 FFT
401, 402, 601 Power measurement unit RD Received signal (interference / noise signal)
SD transmission signal fn null band fs transmission data band

Claims

A wireless device using the same frequency band as other systems,
An antenna for transmitting and receiving radio waves,
A baseband unit that performs signal processing of signals to be transmitted and received;
A transmission unit that converts a signal output from the baseband unit into a radio signal and outputs the signal to the antenna;
A receiving unit that converts a radio signal received by the antenna into a signal and outputs the signal to the baseband unit;
A circulator for outputting the radio signal transmitted and output by the transmitter to the antenna, and outputting the radio signal received by the antenna to the receiver;
The radio signal received in the same frequency band as the radio signal transmitted during the period of transmission of the radio signal by the transmitter, eliminating the influence of leakage of the radio signal transmitted by the transmitter to the reception side A noise signal measurement unit for measuring the power of
A wireless device comprising:
The noise signal measurement unit is a Fourier transform unit that frequency-converts the power of the received signal,
During the transmission period of the radio signal by the transmitter, a power measurement unit that measures the power of the radio signal received in a null band excluding a transmission data band among the frequency bands,
The wireless device according to claim 1, comprising:
The noise signal measurement unit further includes:
3. A power measurement unit that measures power of the radio signal received in a transmission data band and a null band of the frequency band during a period in which the radio signal is not transmitted by the transmission unit. A wireless device according to 1.
The radio apparatus according to claim 1, wherein the reception unit includes a canceller that suppresses the radio signal transmitted by the transmission unit from leaking into the reception unit.
The wireless device according to claim 4, wherein the baseband unit includes a canceller that suppresses leakage of the signal transmitted by the transmission unit into a received signal.
The noise signal measurement unit is a Fourier transform unit that frequency-converts the power of the received signal,
When the transmission unit does not leak the radio signal to the reception unit, reception is performed in the transmission data band and the null band of the frequency band during transmission by the transmission unit and reception by the reception unit. A power measuring unit for measuring the power of the wireless signal,
The wireless device according to claim 1, comprising:
The wireless device according to any one of claims 1 to 6, wherein the noise signal measurement unit accumulates and stores information on the power measured by the power measurement unit in a memory.
A wireless noise measurement method in a wireless device that can simultaneously transmit and receive wireless signals using the same frequency band as other systems,
Eliminate the influence of leakage to the receiving side of the wireless signal to be transmitted,
Measuring the power of the radio signal received in the same frequency band as the radio signal for transmission during the transmission period of the radio signal;
A wireless noise measuring method.
Frequency conversion of the power of the received radio signal,
During the transmission period of the radio signal, the power of the radio signal received in the null band excluding the transmission data band of the frequency band is measured.
The wireless noise measuring method according to claim 8.
During the period in which the radio signal is not transmitted, the power of the radio signal received in the transmission data band and the null band of the frequency band is measured.
The wireless noise measuring method according to claim 9.