CN103916176B - A kind of wireless discharging-directly station and its antenna calibration method - Google Patents
A kind of wireless discharging-directly station and its antenna calibration method Download PDFInfo
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Abstract
A kind of wireless discharging-directly station of present invention offer and its antenna calibration method, are related to the communications field.Wireless discharging-directly station includes：Downlink receives and dispatches access, for the signal of base station to be sent to user terminal；Uplink receives and dispatches access, for the signal of user terminal to be sent to base station；Calibration hair channel receives and dispatches access with downlink and uplink transmitting-receiving access is connect, is used for transmission a calibration signal and receives and dispatches access to downlink transmitting-receiving access or uplink；Channel is received in calibration, receives and dispatches access with downlink and uplink transmitting-receiving access is connect, be used for transmission the signal for receiving and dispatching tunnel by downlink transmitting-receiving access or uplink；Processor is received channel with calibration and is connect, the signal for receiving channel output according to calibration, obtains the penalty coefficient of the response coefficient of compensation downlink transmitting-receiving access or uplink transmitting-receiving access.The present invention solves the problems, such as that wireless discharging-directly station generates the reciprocity of uplink and downlink channel and destroys this.
Description
Technical Field
The invention relates to the field of communication, in particular to a wireless repeater and an antenna calibration method thereof.
Background
Since the radio signal is attenuated as the propagation distance increases, cell edge users and blind area users have poor performance due to weak signals. In order to solve the problems of weak coverage and deep coverage, repeaters are widely used in the current 2G network to improve the coverage. According to application scenarios, the repeater can be divided into an indoor repeater and an outdoor repeater.
The wireless repeater is a same-frequency relay station for directly amplifying mobile communication signals. It does not change the frequency of the original signal and does not process any information carried by the signal.
In the GSM system, uplink signals and downlink signals use different frequency bands, i.e., an FDD duplex mode is used. Because the frequency bands and directions of the uplink signal and the downlink signal are different, and the required signal strengths are also different, the repeater must have the capability of respectively processing the uplink signal and the downlink signal, that is, the uplink signal and the downlink signal respectively adopt two sets of independent transceiving paths. The structure of a wireless repeater used in a current GSM system is shown in fig. 1, and a downlink transceiving path and an uplink transceiving path of the wireless repeater both include: low noise is put, frequency channel selection and attack and put.
In the TD-LTE system, because a Time Division Duplex (TDD) mode is adopted, the same propagation channel (the same frequency) is shared for transceiving, and theoretically, the uplink channel is considered to be equal to the downlink channel, that is, the uplink channel and the downlink channel have reciprocity. As such, a transmitting end (e.g., a base station) in the TDD system may use the uplink pilot signal sent by the user to detect the uplink channel and further obtain the downlink channel, and perform beamforming transmission, such as TM7 single-stream transmission and TM8 dual-stream transmission in the TD-LTE system.
However, in physical implementation, two sets of circuits are required at the rf end of each antenna element to respectively complete transmission and reception of signals, as shown in fig. 2:
actual downlink channel HDLComprises the following steps:
HDL＝RUE·H·TBS
actual uplink channel HULComprises the following steps:
HUL＝RBS·HT·TUE
the downlink channel obtained by the base station by utilizing the reciprocity of the uplink and the downlink is as follows:
wherein R isBSAnd TUEIs a diagonal array, the diagonal elements representing the receive complex gain at each antenna element of the BS and the transmit complex gain at each antenna element of the user terminal (UE), respectively. T denotes a transmission channel, R denotes a reception channel, subscript BS denotes that of the base station side, and subscript UE denotes that of the UE side. N is a radical ofUEAnd NBSRespectively representing the number of antenna arrays of the user and the base station,the mismatch coefficient of the transceiving channel of the ith antenna element at the UE end is shown,and the coefficient proportion of the transceiving channel of the ith antenna element at the BS end is shown.The downlink channel obtained by utilizing reciprocity of the uplink and downlink channels is not equal to the actual downlink channel.
In order to obtain downlink channel information by using the detected uplink channel, the antenna elements of the base station and the user terminal need to be calibrated, as shown in fig. 4.
The calibration target is that a calibration compensation coefficient is multiplied by a receiving channel or a transmitting channel of the antenna array at the base station end and the user end respectively, so that the ratio of the receiving channel coefficient and the transmitting channel coefficient of each antenna array is consistent after calibration. Namely, can satisfy:
wherein,indicating the calibration compensation factor of the ith antenna element at the base station,the calibration compensation coefficient of the ith antenna element of the user terminal is shown,the expression holds for any ith antenna element. In fact, the antenna mismatch at the user end has a limited impact on the downlink pre-processing at the base station end. Therefore, in practice, the reciprocity of the uplink and downlink channels can be realized only by calibrating the antenna array at the base station end.
Antenna calibration is widely used in current TD-SCDMA systems to ensure the channel reciprocity, where the calibration scheme is shown in fig. 3:
the calibration scheme requires a calibration port to assist in radio frequency transmit-receive channel consistency calibration.
1) The antenna transmit-receive channel coefficients are respectively represented by rjAnd tjAnd (4) showing. Where, the subscript j (0 to N) denotes the jth antenna, and j ═ 0 denotes the calibration port.
2) By xjkIndicating the calibration signal transmitted by the kth antenna and received by the jth antenna.
3) α are used for compensating the channel compensation coefficients of antenna transmission and receptionj、βjWhere the subscript j (0 to N) denotes the jth antenna, and j ═ 0 denotes the calibration port.
Assuming that the first antenna is used as a reference antenna, the calibration process is as follows:
A) calibrating each antenna transmitting channel:
a.1) sending a calibration signal s from a transmitting channel of each antenna;
a.2) then withdrawing the calibration signal x from the receive channel of the calibration port01＝r0t1s,...,x0N＝r0tNs；
And A.3) estimating the calibration coefficient of each antenna transmission channel to finish the calibration of the transmission unit.
B) Calibrating receiving channels of each antenna:
b.1) sending a calibration signal s from a calibration transmitting channel;
b.2) then retrieving the calibration signal x from the receive channels of the antennas10＝r1t0s,...,xN0＝rNt0s；
And B.3) estimating the calibration coefficient of each antenna receiving path to finish the calibration of the receiving unit.
α is obtainedj、βj。
The calibration signal processing unit may be located on the BBU side or on the RRU side.
The existing repeater generally adopts independent transceiving paths for processing uplink and downlink signals, as shown in fig. 1, between an eNB and a UE in a TD-LTE system, the uplink and downlink signals pass through different transceiving paths, the uplink signal amplification regeneration passes through an uplink transceiving path, the downlink signal amplification regeneration passes through a downlink transceiving path, and due to different circuit responses, the signal reciprocity of TDD is no longer satisfied. However, since the repeater is transparent to the network, neither the eNB nor the UE knows whether the repeater is installed in the system. If the eNB uses the transmission mode of TM7 single-stream beamforming or TM8 dual-stream beamforming, but at this time, the channel reciprocity of the TDD system is destroyed by the repeater, so that the downlink channel cannot be accurately estimated according to the uplink channel, and thus the performance of the eNB may vary poorly. In the existing TD-LTE system, only the base station side carries out antenna calibration, which cannot ensure that the requirement of channel reciprocity is still met after the repeater is installed.
The existing antenna calibration scheme respectively calibrates a transmitting channel and a receiving channel so as to meet the requirement that the response coefficient proportion of the transmitting and receiving channels among the calibrated antennas is consistent. The calibration requirement of the wireless repeater is to satisfy the requirement that the absolute values of the responses of the whole uplink transceiving path and the whole downlink transceiving path are consistent, so the existing antenna calibration structure (the structure of the calibration antenna and the calibration network, as shown in fig. 3) cannot be directly applied to the wireless repeater.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a wireless repeater and an antenna calibration method thereof, which can calibrate an antenna at the wireless repeater so as to ensure the reciprocity of TDD uplink and downlink channels.
To solve the above technical problem, an embodiment of the present invention provides a wireless repeater, including:
a downlink transceiving path for transmitting a signal of a base station to a user terminal;
an uplink transceiving path for transmitting a signal of the user terminal to a base station;
the calibration transmitting channel is connected with the downlink transmitting and receiving channel and the uplink transmitting and receiving channel and is used for transmitting a calibration signal to the downlink transmitting and receiving channel or the uplink transmitting and receiving channel;
a calibration receiving channel, connected to the downlink transceiving channel and the uplink transceiving channel, for transmitting signals transmitted through the downlink transceiving channel or the uplink transceiving channel;
and the processor is connected with the calibration receiving channel and used for acquiring a compensation coefficient for compensating the response coefficient of the downlink receiving and transmitting channel or the uplink receiving and transmitting channel according to the signal output by the calibration receiving channel.
The calibration transmitting channel is connected with the downlink transmitting and receiving channel and the uplink transmitting and receiving channel through a splitter, a first coupler and a first circulator;
the calibration receiving channel is connected with the downlink receiving and transmitting path and the uplink receiving and transmitting path through a combiner, a second coupler and a second circulator.
The first coupler is used for being connected with a first antenna, receiving the signal of the base station and sending the signal of the base station to a user terminal through the downlink transceiving channel and a second antenna; the second coupler is used for being connected with a second antenna, receiving the signal of the user terminal and sending the signal of the user terminal to the base station through the uplink transceiving channel and the first antenna.
Wherein the downlink transceiving path comprises: a downlink receiving channel and a downlink transmitting channel sequentially connected with the downlink receiving channel;
the uplink transceiving path comprises: an uplink receiving channel and an uplink transmitting channel sequentially connected with the uplink receiving channel;
the downlink receiving channel and the uplink transmitting channel are both connected with the first circulator, and the downlink transmitting channel and the uplink receiving channel are both connected with the second circulator.
Wherein, the wireless repeater of this embodiment still includes:
and the compensation unit is connected with the processor, the downlink transceiving channel and the uplink transceiving channel and is used for performing signal compensation on the downlink transceiving channel according to the compensation coefficient of the downlink transceiving channel or performing signal compensation on the uplink transceiving channel according to the compensation coefficient of the uplink transceiving channel.
Wherein the compensation unit includes:
a first multiplier arranged on the downlink transceiving path, configured to multiply the compensation coefficient of the downlink transceiving path with the signal from the base station, and send the signal obtained after multiplication to the user terminal through the downlink transceiving path;
and the second multiplier is arranged on the uplink transceiving path and used for multiplying the compensation coefficient of the uplink transceiving path by the signal from the user terminal and sending the signal obtained after multiplication to the base station through the uplink transceiving path.
Wherein, the signal that the calibration received the channel output includes: a first signal output by the calibration signal after passing through the downlink transceiving path and the calibration receiving channel, and a second signal output by the calibration signal after passing through the uplink transceiving path and the calibration receiving channel;
wherein the first signal sDLComprises the following steps: sDL＝rCAL·tDL·rDL·tCAL·s0；
Said second signal sULComprises the following steps: sUL＝rCAL·tUL·rUL·tCAL·s0(ii) a Wherein,
tDLis the response coefficient, t, of the downlink transmission channelULIs the response coefficient, r, of the upstream transmit channelDLIs the response coefficient, r, of the downstream receive pathULIs the response coefficient, t, of the upstream receive pathCALIs the response coefficient, r, of the calibration transmitter channelCALIs the response coefficient, s, of the calibration receive channel0The calibration transmitting channel transmits a signal;
when the compensation coefficient of the downlink transceiving channel is 1, the processor according to a formula kUL＝sDL/sULObtaining a compensation coefficient k for compensating the uplink transceiving pathUL。。
The embodiment of the invention also discloses an antenna calibration method of the wireless repeater, and the wireless repeater comprises the following steps: a downlink transceiving path and an uplink transceiving path; the method comprises the following steps:
transmitting a calibration signal to a downlink transceiving channel or an uplink transceiving channel;
acquiring signals output by the calibration signals through a calibration transmitting channel, the downlink transmitting and receiving channel and a calibration receiving channel, or signals output by the calibration signals through the calibration transmitting channel, the uplink transmitting and receiving channel and the calibration receiving channel;
and acquiring a compensation coefficient for compensating the response coefficient of the downlink transceiving channel or the uplink transceiving channel according to the signal output by the calibration transceiving channel.
Wherein, after obtaining the compensation coefficient for compensating the response coefficient of the downlink transceiving path or the uplink transceiving path, the method further comprises:
and performing signal compensation on the downlink transceiving channel according to the compensation coefficient of the downlink transceiving channel or performing signal compensation on the uplink transceiving channel according to the compensation coefficient of the uplink transceiving channel.
Wherein, the step of performing signal compensation on the downlink transceiving channel according to the compensation coefficient of the downlink transceiving channel comprises:
and multiplying the compensation coefficient of the downlink transceiving channel by the signal from the base station, and sending the signal obtained after multiplication to the user terminal through the downlink transceiving channel.
Wherein, the step of performing signal compensation on the uplink transceiving path according to the compensation coefficient of the uplink transceiving path comprises: and multiplying the compensation coefficient of the uplink transceiving channel by the signal from the user terminal, and sending the signal obtained after multiplication to the base station through the uplink transceiving channel.
Wherein, the signal that the calibration received the channel output includes: a first signal output by the calibration signal after passing through the downlink transceiving path and the calibration receiving channel, and a second signal output by the calibration signal after passing through the uplink transceiving path and the calibration receiving channel; wherein,
the first signal sDLComprises the following steps: sDL＝rCAL·tDL·rDL·tCAL·s0；
Said second signal sULComprises the following steps: sUL＝rCAL·tUL·rUL·tCAL·s0(ii) a Wherein,
tDLis the response coefficient, t, of the downlink transmission channelULIs the response coefficient, r, of the upstream transmit channelDLIs the response coefficient, r, of the downstream receive pathULIs the response coefficient, t, of the upstream receive pathCALIs the response coefficient, r, of the calibration transmitter channelCALIs the response coefficient, s, of the calibration receive channel0The calibration transmitting channel transmits a signal;
the step of obtaining the compensation coefficient for compensating the uplink transceiving channel comprises the following steps:
when the compensation coefficient of the downlink transceiving channel is 1, according to a formula kUL＝sDL/sULAnd acquiring a compensation coefficient for compensating the uplink transceiving channel.
The technical scheme of the invention has the following beneficial effects:
compared with the prior art, the invention calibrates the uplink transceiving channel and the downlink transceiving channel at the wireless repeater, and solves the problem that reciprocity of the TDD uplink and downlink channels is damaged due to the direct introduction of the wireless direct connection station in the TD-LTE system.
Drawings
FIG. 1 is a schematic diagram of a wireless repeater in the prior art;
fig. 2 is a diagram illustrating signal calibration between a base station and a client terminal in the prior art;
fig. 3 is a schematic structural diagram of a remote radio module implementing self-calibration in the prior art;
FIG. 4 is a schematic structural diagram of a wireless repeater according to the present invention;
fig. 5 is a flowchart illustrating an antenna calibration method according to the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
Example 1
A wireless repeater, comprising:
a downlink transceiving path for transmitting a signal of a base station to a user terminal;
an uplink transceiving path for transmitting a signal of the user terminal to a base station;
the calibration transmitting channel is connected with the downlink transmitting and receiving channel and the uplink transmitting and receiving channel and is used for transmitting a calibration signal to the downlink transmitting and receiving channel or the uplink transmitting and receiving channel;
a calibration receiving channel, connected to the downlink transceiving channel and the uplink transceiving channel, for transmitting signals transmitted through the downlink transceiving channel or the uplink transceiving channel;
and the processor is connected with the calibration receiving channel and used for acquiring a compensation coefficient for compensating the response coefficient of the downlink receiving and transmitting channel or the uplink receiving and transmitting channel according to the signal output by the calibration receiving channel.
According to the scheme, the uplink transceiving channel and the downlink transceiving channel are calibrated at the wireless repeater, so that the problem that reciprocity of TDD uplink and downlink channels is damaged due to the fact that the wireless direct connection station is directly introduced into a TD-LTE system is solved.
As shown in fig. 4, the following takes a single-antenna wireless repeater as an example (a multi-antenna wireless repeater can be analogized directly), and the structure of the scheme is described specifically:
compared with the traditional repeater, the invention needs to increase a calibration transmitting channel and a calibration receiving channel. In addition, the requirements to be met by the calibration network are: the calibration transmitting channel respectively has the same response to the paths passed by the uplink receiving channel and the downlink receiving channel, and the uplink transmitting channel and the downlink transmitting channel respectively have the same response to the paths passed by the calibration receiving channel.
The calibration transmitting channel is connected with the downlink transmitting and receiving channel and the uplink transmitting and receiving channel through a splitter, a first coupler and a first circulator; the calibration receiving channel is connected with the downlink receiving and transmitting path and the uplink receiving and transmitting path through a combiner, a second coupler and a second circulator.
The first coupler is used for being connected with a first antenna, receiving the signal of the base station and sending the signal of the base station to a user terminal through the downlink transceiving channel and a second antenna;
the second coupler is used for being connected with a second antenna, receiving the signal of the user terminal and sending the signal of the user terminal to the base station through the uplink transceiving channel and the first antenna.
The downlink transceiving path includes: a downlink receiving channel and a downlink transmitting channel sequentially connected with the downlink receiving channel;
the uplink transceiving path comprises: an uplink receiving channel and an uplink transmitting channel sequentially connected with the uplink receiving channel;
the downlink receiving channel and the uplink transmitting channel are both connected with the first circulator, and the downlink transmitting channel and the uplink receiving channel are both connected with the second circulator.
The wireless repeater of the scheme also comprises:
and the compensation unit is connected with the processor, the downlink transceiving channel and the uplink transceiving channel and is used for performing signal compensation on the downlink transceiving channel according to the compensation coefficient of the downlink transceiving channel or performing signal compensation on the uplink transceiving channel according to the compensation coefficient of the uplink transceiving channel.
Specifically, the compensation unit includes:
a first multiplier arranged on the downlink transceiving path and connected with the processor, acquiring a compensation coefficient aiming at a downlink channel sent by the processor, multiplying the compensation coefficient of the downlink transceiving path by a signal from the base station, and sending the signal obtained after multiplication to the user terminal through the downlink transceiving path; and a second multiplier, which is arranged on the uplink transceiving path and is also connected with the processor, acquires a compensation coefficient aiming at an uplink channel sent by the processor, multiplies the compensation coefficient of the uplink transceiving path by a signal from the user terminal, and sends the multiplied signal to the base station through the uplink transceiving path. It should be noted that the first multiplier may be located before the downlink receiving channel, between the downlink receiving channel and the downlink transmitting channel, or after the downlink transmitting channel; the second multiplier may be located before the uplink receiving channel, between the uplink receiving channel and the uplink transmitting channel, or after the uplink transmitting channel.
In the above embodiment, the calibration receiving channel outputs a signal including: a first signal output by the calibration signal after passing through the downlink transceiving path and the calibration receiving channel, and a second signal output by the calibration signal after passing through the uplink transceiving path and the calibration receiving channel;
specifically, the method comprises the following steps: sending calibration signal s to downlink receiving channel through calibration sending channel0The signal output from the calibration receiving channel via the downlink receiving channel and the downlink transmitting channel is sDL(i.e., the first signal);
wherein s isDL＝rCAL·tDL·rDL·tCAL·s0。
Sending the same calibration signal s to the uplink receiving channel through the calibration sending channel0The signal output from the calibration receiving channel via the uplink receiving channel and the uplink transmitting channel is sUL(i.e., the second signal);
wherein s isUL＝rCAL·tUL·rUL·tCAL·s0。
When the compensation coefficient of the downlink transceiving path is 1 (i.e. the downlink transceiving path is taken as a reference), the processor according to the formula kUL＝sDL/sULObtaining a compensation coefficient k for compensating the uplink transceiving pathUL；
Of course, when the compensation factor of the uplink transceiving path is 1 (i.e. the uplink transceiving path is taken as a reference), the processor may be according to the formula kDL＝SUL/SDLObtaining the compensation coefficient k of the downlink transceiving pathDL。
Wherein, tDLIs the response coefficient, t, of the downlink transmission channelULIs the response coefficient, r, of the upstream transmit channelDLIs the response coefficient, r, of the downstream receive pathULIs the response coefficient, t, of the upstream receive pathCALIs the response coefficient, r, of the calibration transmitter channelCALIs the response coefficient, s, of the calibration receive channel0The calibration signal is sent by the calibration sending channel;
when the base station sends out a downlink signal, the downlink signal is received by the first antenna and passes through the downlink transceiving channel, and the compensation coefficient k of the downlink transceiving channel is converted by the first multiplier at the momentDLMultiplying the downlink signal to complete the compensation of the downlink signal, and sending the signal obtained after the multiplication to a user terminal through the downlink transceiving channel and a second antenna;
when the user terminal sends out the up signal, it is received by the second antenna, and passes through the up receiving and transmitting channel, at this time the second multiplier makes the compensation coefficient k of the up receiving and transmitting channelULAnd multiplying the uplink signal to complete the compensation of the uplink signal, and sending the signal obtained after the multiplication to the base station through the uplink transceiving channel and the first antenna.
The wireless repeater of the embodiment calibrates the uplink transceiving channel and the downlink transceiving channel through the calibration transceiving channel and the calibration transceiving channel, and solves the problem that reciprocity of the uplink and downlink channels of TDD is damaged due to the direct introduction of the wireless direct connection station in the TD-LTE system. Further, the first multiplier acquires a compensation coefficient aiming at a downlink transceiving channel sent by the processor, and multiplies a downlink signal sent by the base station by the compensation coefficient; and the second multiplier acquires a compensation coefficient aiming at the uplink transceiving channel sent by the processor, and multiplies the uplink signal sent by the user terminal by the compensation coefficient, thereby completing the signal compensation of the wireless repeater.
Example 2
As shown in fig. 5, an antenna calibration method for a wireless repeater, the wireless repeater includes: a downlink transceiving path and an uplink transceiving path; the method comprises the following steps:
step 1, transmitting a calibration signal to a downlink transceiving channel or an uplink transceiving channel;
step 2, acquiring signals output by the calibration signal through a calibration transmitting channel, the downlink transmitting and receiving channel and a calibration receiving channel, or signals output by the calibration signal through the calibration transmitting channel, the uplink transmitting and receiving channel and the calibration receiving channel;
and 3, acquiring a compensation coefficient for compensating the response coefficient of the downlink transceiving channel or the uplink transceiving channel according to the signal output by the calibration transceiving channel.
According to the scheme, the antenna is calibrated at the wireless repeater, so that the condition that the reciprocity of the TDD uplink and downlink channels is damaged due to the direct introduction of the wireless direct station in the TD-LTE system is avoided.
After obtaining a compensation coefficient for compensating a response coefficient of the downlink transceiving path or the uplink transceiving path, the method may further include:
and performing signal compensation on the downlink transceiving channel according to the compensation coefficient of the downlink transceiving channel (i.e. the compensation coefficient of the downlink transceiving channel is multiplied by the signal from the base station, and the multiplied signal is sent to the user terminal through the downlink transceiving channel), or performing signal compensation on the uplink transceiving channel according to the compensation coefficient of the uplink transceiving channel (i.e. the compensation coefficient of the uplink transceiving channel is multiplied by the signal from the user terminal, and the multiplied signal is sent to the base station through the uplink transceiving channel).
During specific compensation, the signals output by the calibration receiving channel comprise: a first signal output by the calibration signal after passing through the downlink transceiving path and the calibration receiving channel, and a second signal output by the calibration signal after passing through the uplink transceiving path and the calibration receiving channel;
specifically, the method comprises the following steps: sending calibration signal s to downlink receiving channel through calibration sending channel0The signal output from the calibration receiving channel via the downlink receiving channel and the downlink transmitting channel is sDL(i.e., the first signal);
wherein s isDL＝rCAL·tDL·rDL·tCAL·s0。
Sending the same calibration signal s to the uplink receiving channel through the calibration sending channel0The signal output from the calibration receiving channel via the uplink receiving channel and the uplink transmitting channel is sUL(i.e., the second signal);
wherein s isUL＝rCAL·tUL·rUL·tCAL·s0。
When the compensation coefficient of the downlink transceiving path is 1 (i.e. based on the downlink transceiving path), according to the formula kUL＝sDL/sULObtaining a compensation coefficient k for compensating the uplink transceiving pathUL；
Of course, when the compensation coefficient of the uplink transmission/reception path is 1 (i.e. the uplink transmission/reception path is used as a reference), the formula k may be usedDL＝SUL/SDLObtaining the compensation coefficient k of the downlink transceiving pathDL。。
tDLIs the response coefficient, t, of the downlink transmission channelULIs the response coefficient, r, of the upstream transmit channelDLIs the response coefficient, r, of the downstream receive pathULIs the response coefficient, t, of the upstream receive pathCALIs the response coefficient, r, of the calibration transmitter channelCALIs the response coefficient, s, of the calibration receive channel0The calibration signal is sent by the calibration sending channel;
when the base station sends out the downlink signal, the first dayReceiving line, passing through downlink transceiver channel, and using the compensation coefficient k of said downlink transceiver channel by first multiplierDLMultiplying the downlink signal to complete the compensation of the downlink signal, and sending the signal obtained after the multiplication to a user terminal through the downlink transceiving channel and a second antenna;
when the user terminal sends out the up signal, it is received by the second antenna, and passes through the up receiving and transmitting channel, at this time the second multiplier makes the compensation coefficient k of the up receiving and transmitting channelULAnd multiplying the uplink signal to complete the compensation of the uplink signal, and sending the signal obtained after the multiplication to the base station through the uplink transceiving channel and the first antenna.
The method of the embodiment can calibrate the uplink transceiving channel and the downlink transceiving channel of the universal wireless repeater, and solves the problem that reciprocity of the uplink channel and the downlink channel of the TDD is damaged due to the direct introduction of the wireless universal repeater in the TD-LTE system. Further, the method also multiplies the downlink signal sent by the base station by the compensation coefficient aiming at the downlink channel; and multiplying the uplink signal sent by the client terminal by the compensation coefficient aiming at the uplink channel, thereby completing the signal compensation of the wireless repeater.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (3)
1. A wireless repeater, comprising:
a downlink transceiving path for transmitting a signal of a base station to a user terminal; the downlink transceiving path includes: a downlink receiving channel and a downlink transmitting channel sequentially connected with the downlink receiving channel;
an uplink transceiving path for transmitting a signal of the user terminal to a base station; the uplink transceiving path comprises: an uplink receiving channel and an uplink transmitting channel sequentially connected with the uplink receiving channel;
the first multiplier is arranged on the downlink transceiving channel and connected with the downlink transceiving channel;
the second multiplier is arranged on the uplink receiving and transmitting channel and is connected with the uplink receiving channel; the second multiplier is also connected with the first multiplier;
the first circulator is respectively connected with a downlink receiving channel in the downlink receiving and transmitting channel and an uplink transmitting channel in the uplink receiving and transmitting channel;
a second circulator connected to the first multiplier and the second multiplier, respectively;
a first coupler connected to the first circulator;
a second coupler connected to the second circulator;
the calibration transmitting channel is connected with the first coupler through a splitter and is used for transmitting a calibration signal to the downlink transceiving channel or the uplink transceiving channel;
the calibration receiving channel is connected with the second coupler through a combiner and is used for transmitting signals transmitted through the downlink transceiving channel or the uplink transceiving channel;
the processor is respectively connected with the calibration receiving channel and the first multiplier and is used for acquiring a compensation coefficient for compensating the response coefficient of the downlink transceiving channel or the uplink transceiving channel according to the signal output by the calibration receiving channel;
the calibration receiving channel outputs signals including: a first signal output by the calibration signal after passing through the downlink transceiving path and the calibration receiving channel, and a second signal output by the calibration signal after passing through the uplink transceiving path and the calibration receiving channel; wherein,
the first signal is sDLWherein: sDL＝rCAL·tDL·rDL·tCAL·s0；
The second signal is sULWherein: sUL＝rCAL·tUL·rUL·tCAL·s0；
Wherein, tDLIs thatResponse coefficient of downlink transmission channel, tULIs the response coefficient, r, of the upstream transmit channelDLIs the response coefficient, r, of the downstream receive pathULIs the response coefficient, t, of the upstream receive pathCALIs the response coefficient, r, of the calibration transmitter channelCALIs the response coefficient, s, of the calibration receive channel0Is a signal sent by the calibration sending channel;
when the compensation coefficient of the response coefficient of the downlink transceiving channel is 1, the processor performs the processing according to a formula kUL＝sDL/sULObtaining a compensation coefficient k for compensating the response coefficient of the uplink transceiving pathUL(ii) a When the compensation coefficient of the response coefficient of the uplink transceiving path is 1, according to the formula kDL＝SUL/SDLObtaining a compensation coefficient k of the response coefficient of the downlink transceiving pathDL；
The first multiplier is used for acquiring a compensation coefficient of the response coefficient of the downlink transceiving channel from the processor, multiplying the compensation coefficient of the response coefficient of the downlink transceiving channel by a signal from the base station, and sending the signal obtained after multiplication to the user terminal;
the second multiplier is configured to obtain a compensation coefficient of the response coefficient of the uplink transceiving path from the processor, multiply the compensation coefficient of the response coefficient of the uplink transceiving path with a signal from the user terminal, and send a signal obtained after the multiplication to the base station.
2. The wireless repeater according to claim 1,
the first coupler is used for being connected with a first antenna, receiving the signal of the base station and sending the signal of the base station to a user terminal through the downlink transceiving channel and a second antenna;
the second coupler is used for being connected with a second antenna, receiving the signal of the user terminal and sending the signal of the user terminal to the base station through the uplink transceiving channel and the first antenna.
3. An antenna calibration method of a wireless repeater, the wireless repeater is the wireless repeater according to claim 1 or 2; characterized in that the method comprises:
transmitting a calibration signal to a downlink transceiving channel or an uplink transceiving channel;
acquiring signals output by the calibration signals through a calibration transmitting channel, the downlink transmitting and receiving channel and a calibration receiving channel, or signals output by the calibration signals through the calibration transmitting channel, the uplink transmitting and receiving channel and the calibration receiving channel;
acquiring a compensation coefficient for compensating a response coefficient of the downlink transceiving channel or the uplink transceiving channel according to the signal output by the calibration transceiving channel;
multiplying the compensation coefficient of the response coefficient of the downlink transceiving channel by the signal from the base station, and sending the signal obtained after multiplication to the user terminal; or multiplying the compensation coefficient of the response coefficient of the uplink transceiving channel by the signal from the user terminal, and sending the signal obtained after multiplication to the base station.
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