CN106911365B - Method and device for correcting polarized antenna array channel - Google Patents

Method and device for correcting polarized antenna array channel Download PDF

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Publication number
CN106911365B
CN106911365B CN201510963842.1A CN201510963842A CN106911365B CN 106911365 B CN106911365 B CN 106911365B CN 201510963842 A CN201510963842 A CN 201510963842A CN 106911365 B CN106911365 B CN 106911365B
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antenna
polarized
correction
calibration signal
signal
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CN106911365A (en
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朱勇旭
沈莹
潘成康
王桂珍
倪吉庆
范志明
马万治
刘东林
易芝玲
邵士海
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China Mobile Communications Group Co Ltd
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China Mobile Communications Group Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0408—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/10—Monitoring; Testing of transmitters
    • H04B17/11—Monitoring; Testing of transmitters for calibration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection

Abstract

The invention provides a method and a device for correcting a polarized antenna array channel, wherein the method comprises the following steps: selecting at least one polarized antenna from the first polarized antennas as a first reference antenna, correcting other polarized antennas except the first reference antenna according to the first reference antenna, and determining a first correction coefficient group of a k-th subcarrier, wherein k is 1, 2 … Nc, and k/Nc is a subcarrier serial number/number; selecting at least one polarized antenna from the second polarized antennas as a second reference antenna, correcting other polarized antennas except the second reference antenna according to the second reference antenna, and determining a second correction coefficient group of the kth subcarrier; correcting the first reference antenna and the second reference antenna, and determining a third correction coefficient of a kth subcarrier; and generating a correction coefficient matrix corresponding to the k-th subcarrier according to the first correction coefficient group, the second correction coefficient group and the third correction coefficient, and correcting the polarized antenna array channel by using the correction coefficient matrix.

Description

Method and device for correcting polarized antenna array channel
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a method and an apparatus for calibrating a polarized antenna array channel.
Background
In large-scale antenna array systems, antenna calibration plays an important role. The radio frequency channels corresponding to each antenna often do not have symmetry, which destroys the TDD (Time Division Duplex) system, and assumes reciprocity of the uplink and downlink channels, so that it is not easy to obtain downlink channel state information from uplink channel estimation, and it is difficult to implement accurate downlink beamforming. Usually, antenna calibration is introduced, the difference between the radio frequency channels is measured in advance, pre-compensation is performed when signals are transmitted, and the consistency of transceiving of the radio frequency channels is maintained.
The solutions in the prior art are divided into two types:
one is to rely on additional hardware devices to construct a coupling network for absolute calibration; and measuring the channel response of each radio frequency channel to obtain the required calibration parameters.
The other is that based on the air signal bidirectional transmission, the relative calibration parameters are measured, and the measurement is specifically classified into 2 types: (a) based on channel calibration assisted by User Equipment (UE), that is, selecting one UE for assisting channel calibration, using the UE to feed back response parameters of radio frequency channels of antennas obtained by measurement of the UE, and using the fed back parameters by a base station or an access point to calculate calibration parameters; (b) and selecting a reference antenna (possibly an additional antenna) only at the base station end without UE-assisted channel calibration, namely without UE participation, performing signal transceiving between the reference antenna and the antenna to be calibrated, testing the duplex channel response, and calculating a calibration parameter.
The first solution has the problems that the installation and debugging are inconvenient due to the dependence on specific hardware equipment, and the difficulty in constructing a correction network is high for a large-distance antenna (such as a remote antenna or a distributed antenna). In addition, for a large-scale antenna system, the number of additional calibration networks increases the cost of the whole system as the antenna scale increases; the problem with the solution (a) in the second solution is that the method relying on the user to feed back the response parameters of each rf channel is limited by the signal processing capability of the user side, and is still not flexible enough to be used in a large-scale antenna.
(b) Compared with the first and second schemes (b), the scheme only carries out bidirectional signal interaction on the base station side, and has certain feasibility. However, considering that the number of antennas in a large-scale antenna system is large and the real space is limited, it is difficult to deploy a sufficient number of antennas. Therefore, an antenna array is constructed by adopting a polarized antenna mode, 2 antennas with different polarization modes are configured on each RRU (remote radio Unit remote radio frequency module), one antenna position is shared, and under the condition that the antenna spacing is not changed, the area occupied by the same number of antennas can be reduced by half. Therefore, when the channel correction is performed by using the second scheme (b), due to the existence of polarization isolation, half of the parameters are affected by the polarization isolation, and the correction effect is not ideal.
Disclosure of Invention
An object of the embodiments of the present invention is to provide a method and an apparatus for calibrating a polarized antenna array channel, so as to solve the problem of unsatisfactory calibration effect caused by polarization isolation.
In order to achieve the above object, an embodiment of the present invention provides a method for channel calibration of a polarized antenna array, where the polarized antenna array includes: a first type of polarized antenna having a same first polarization and a second type of polarized antenna having a same second polarization, the method comprising:
selecting at least one polarized antenna from the first polarized antennas as a first reference antenna, correcting other polarized antennas except the first reference antenna according to the first reference antenna, and determining a first correction coefficient group of a k-th subcarrier, wherein k is a subcarrier serial number, k is 1, 2, …, and Nc is the number of subcarriers;
selecting at least one polarized antenna from the second polarized antennas as a second reference antenna, correcting other polarized antennas except the second reference antenna according to the second reference antenna, and determining a second correction coefficient group of a k-th subcarrier;
correcting the first reference antenna and the second reference antenna, and determining a third correction coefficient of a kth subcarrier;
and generating a correction coefficient matrix corresponding to the k-th subcarrier according to the first correction coefficient group, the second correction coefficient group and the third correction coefficient, and correcting the polarized antenna array channel by using the obtained correction coefficient matrix.
Further, a polarized antenna T is selected from said first type of polarized antenna1As the first reference antenna, wherein1Other polarized antennas sharing RRU are denoted as TiWherein i is 3,5, …, 2 n-1, n is a positive integer greater than 2;
sequentially completing the polarized antenna T1And a polarized antenna TiRespectively obtaining the calibration signal Y1,i(k) And a calibration signal Yi,1(k) Wherein the calibration signal Y1,i(k) For polarizing antenna TiReceived by polarized antenna T1A transmitted preset calibration signal Yi,1(k) For polarizing antenna T1Received by polarized antenna TiSending a preset calibration signal;
according to the calibration signal Y1,i(k) And said calibration signal Yi,1(k) And determining a first correction coefficient group of the k-th subcarrier.
Further, the selecting at least one polarized antenna from the second type of polarized antenna as a second reference antenna, correcting other polarized antennas except the second reference antenna according to the second reference antenna, and determining a second correction coefficient group of a k-th subcarrier includes:
polarization from the second kindSelectively polarized antenna T in antenna2As the second reference antenna, wherein2Other polarized antennas sharing RRU are denoted as TjWherein j is 4,6, …, 2n, n is a positive integer greater than or equal to 2;
sequentially completing the polarized antenna T2And a polarized antenna TjRespectively obtaining the calibration signal Y2,j(k) And a calibration signal Yj,2(k) Wherein the calibration signal Y2,j(k) For polarizing antenna TjReceived by polarized antenna T2A transmitted preset calibration signal Yj,2(k) For polarizing antenna T2Received by polarized antenna TjSending a preset calibration signal;
according to the calibration signal Y2,j(k) And said calibration signal Yj,2(k) And determining a second correction coefficient group of the k-th subcarrier.
Further, the correcting the first reference antenna and the second reference antenna to determine a third correction coefficient of a kth subcarrier includes:
obtaining a correction signal Y received by the second reference antenna1,2(k) And acquiring a correction signal Y received by the first reference antenna2,1(k) Wherein the signal Y is corrected1,2(k) The correction signal Y is a predetermined calibration signal transmitted by the first reference antenna and received directly by the second reference antenna2,1(k) The calibration signal is a preset calibration signal directly received by a first reference antenna and transmitted by a second reference antenna;
according to the correction signal Y1,2(k) And the correction signal Y2,1(k) And determining a third correction coefficient for the k-th subcarrier.
Further, the correcting the first reference antenna and the second reference antenna to determine a third correction coefficient of a kth subcarrier includes:
obtaining a correction signal Y received by the second reference antenna1,2(k) And acquiring a correction signal Y received by the first reference antenna2,1(k) Wherein the correction informationNumber Y1,2(k) For the preset calibration signal transmitted by the first reference antenna received by the receiving radio frequency channel of the second reference antenna via the coupling correction network, the calibration signal Y2,1(k) A preset calibration signal transmitted by a second reference antenna is received by a receiving radio frequency channel of a first reference antenna through a coupling correction network;
according to the correction signal Y1,2(k) And the correction signal Y2,1(k) And determining a third correction coefficient for the k-th subcarrier.
An embodiment of the present invention further provides a device for calibrating a channel of a polarized antenna array, where the polarized antenna array includes: a first type of polarized antenna having a same first polarization and a second type of polarized antenna having a same second polarization, wherein the apparatus comprises:
a first selection determining module, configured to select at least one polarized antenna from the first type of polarized antenna as a first reference antenna, correct other polarized antennas except the first reference antenna according to the first reference antenna, and determine a first correction coefficient group of a kth subcarrier, where k is a subcarrier sequence number, and k is 1, 2, …, Nc, where Nc is the number of subcarriers;
a second selection determining module, configured to select at least one polarized antenna from the second type of polarized antennas as a second reference antenna, correct other polarized antennas except the second reference antenna according to the second reference antenna, and determine a second correction coefficient group of a kth subcarrier;
a determining module, configured to correct the first reference antenna and the second reference antenna, and determine a third correction coefficient of a kth subcarrier;
and the generation correction module is used for generating a correction coefficient matrix corresponding to the k-th subcarrier according to the first correction coefficient group, the second correction coefficient group and the third correction coefficient, and correcting the polarized antenna array channel by using the obtained correction coefficient matrix.
Further, the first selection determining module includes:
a first selection unit for selecting a polarized antenna T from said first type of polarized antenna1As the first reference antenna, wherein1Other polarized antennas sharing RRU are denoted as TiWherein i is 3,5, …, 2 n-1, n is a positive integer greater than 2;
a first obtaining unit for sequentially completing the polarized antennas T1And a polarized antenna TiRespectively obtaining the calibration signal Y1,i(k) And a calibration signal Yi,1(k) Wherein the calibration signal Y1,i(k) For polarizing antenna TiReceived by polarized antenna T1A transmitted preset calibration signal Yi,1(k) For polarizing antenna T1Received by polarized antenna TiSending a preset calibration signal;
a first determination unit for determining the calibration signal Y1,i(k) And said calibration signal Yi,1(k) And determining a first correction coefficient group of the k-th subcarrier.
Further, the second selection determining module includes:
a second selection unit for selecting a polarized antenna T from said second type of polarized antenna2As the second reference antenna, wherein2Other polarized antennas sharing RRU are denoted as TjWherein j is 4,6, …, 2n, n is a positive integer greater than or equal to 2;
a second obtaining unit for sequentially completing the polarized antennas T2And a polarized antenna TjRespectively obtaining the calibration signal Y2,j(k) And a calibration signal Yj,2(k) Wherein the calibration signal Y2,j(k) For polarizing antenna TjReceived by polarized antenna T2A transmitted preset calibration signal Yj,2(k) For polarizing antenna T2Received by polarized antenna TjSending a preset calibration signal;
a second determination unit for determining the calibration signal Y2,j(k) Andthe calibration signal Yj,2(k) And determining a second correction coefficient group of the k-th subcarrier.
Further, the determining module comprises:
a first obtaining unit for obtaining the correction signal Y received by the second reference antenna1,2(k) And acquiring a correction signal Y received by the first reference antenna2,1(k) Wherein the signal Y is corrected1,2(k) The correction signal Y is a predetermined calibration signal transmitted by the first reference antenna and received directly by the second reference antenna2,1(k) The calibration signal is a preset calibration signal directly received by a first reference antenna and transmitted by a second reference antenna;
a third determination unit for determining the correction signal Y1,2(k) And the correction signal Y2,1(k) And determining a third correction coefficient for the k-th subcarrier.
Further, the determining unit includes:
a second obtaining unit for obtaining the correction signal Y received by the second reference antenna1,2(k) And acquiring a correction signal Y received by the first reference antenna2,1(k) Wherein the signal Y is corrected1,2(k) For the preset calibration signal transmitted by the first reference antenna received by the receiving radio frequency channel of the second reference antenna via the coupling correction network, the calibration signal Y2,1(k) A preset calibration signal transmitted by a second reference antenna is received by a receiving radio frequency channel of a first reference antenna through a coupling correction network;
a fourth determination unit for determining the correction signal Y1,2(k) And the correction signal Y2,1(k) And determining a third correction coefficient for the k-th subcarrier.
The technical scheme of the embodiment of the invention has the following beneficial effects:
in the scheme of the embodiment of the invention, a first reference antenna is selected from a first type of polarized antenna, other polarized antennas are corrected, a second reference antenna is selected from a second type of polarized antenna, other polarized antennas are corrected, the first reference antenna and the second reference antenna are mutually corrected, a correction coefficient matrix is determined, the correction of a polarized antenna array channel is carried out by using the obtained correction coefficient matrix, the correction effect is ensured, and the channel correction of the polarized antenna array is realized; and because the first reference antenna and the second reference antenna are polarized with each other, the influence of polarization isolation is small, and the correction effect is improved.
Drawings
Fig. 1 is a basic flowchart of a method for calibrating a polarized antenna array channel according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a polarized antenna array channel according to a first embodiment of the present invention;
fig. 3 is a flowchart illustrating a polarized antenna array channel calibration method according to a second embodiment of the present invention;
fig. 4 is a schematic diagram of 16 pairs of polarized antenna array channels in accordance with a second embodiment of the present invention;
fig. 5 is a schematic structural diagram of a polarized antenna array channel calibration apparatus according to a third embodiment of 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.
First embodiment
As shown in fig. 1, a polarized antenna array channel calibration method according to an embodiment of the present invention includes: a first type of polarized antenna having a same first polarization and a second type of polarized antenna having a same second polarization, wherein the method comprises:
step 101, selecting at least one polarized antenna from the first polarized antennas as a first reference antenna, correcting other polarized antennas except the first reference antenna according to the first reference antenna, and determining a first correction coefficient group of a k-th subcarrier, where k is a subcarrier number, and k is 1, 2, …, Nc, where Nc is the number of subcarriers.
The polarization mode of the first type of polarized antenna is different from the polarization mode of the second type of polarized antenna, and the first reference antenna and the second reference antenna are polarized with each other. This step preferably selects one of the polarized antennas from the first type of polarized antenna as the first reference antenna, which reduces the selection of multiple reference antennas and simplifies the complexity of calibration.
And 102, selecting at least one polarized antenna from the second polarized antennas as a second reference antenna, correcting other polarized antennas except the second reference antenna according to the second reference antenna, and determining a second correction coefficient group of the kth subcarrier.
Step 103, correcting the first reference antenna and the second reference antenna, and determining a third correction coefficient of the kth subcarrier.
And 104, generating a correction coefficient matrix corresponding to the kth subcarrier according to the first correction coefficient group, the second correction coefficient group and the third correction coefficient, and correcting the polarized antenna array channel by using the obtained correction coefficient matrix.
In the embodiment of the invention, a first reference antenna is selected from a first type of polarized antenna to correct other polarized antennas, a second reference antenna is selected from a second type of polarized antenna to correct other polarized antennas, the first reference antenna and the second reference antenna are mutually corrected to determine a correction coefficient matrix, and the obtained correction coefficient matrix is used for correcting a polarized antenna array channel, so that the correction effect is ensured, and the channel correction of the polarized antenna array is realized; and because the first reference antenna and the second reference antenna are polarized with each other, the influence of polarization isolation is small, and the correction effect is improved.
In the method for calibrating a polarized antenna array channel according to the embodiment of the present invention, a polarized antenna in the first polarized antenna is marked as a polarized antenna TiWherein i is 1, 3,5, … 2 n-1; marking polarized antennas of said first type of polarized antennas as polarized antennas TjWherein j is 2, 4,6, 8, …, 2n, wherein the polarized antenna T isiAnd the polarized antenna TjIs a polarized antenna on the same RRU, and n is positive integerAnd (4) counting.
The description is as follows: each RRU employs a polarized antenna, or each RRU has at least 2 mutually polarized antennas (i.e. a first polarized antenna and a second polarized antenna), and the plurality of RRUs form an antenna array, where the step 101 includes:
step 1011, selecting a polarized antenna T from the first polarized antennas1As the first reference antenna, wherein1Other polarized antennas sharing RRU are denoted as TiWherein i is 3,5, …, 2 n-1, n is a positive integer greater than 2. This step preferably selects the polarized antenna T1As a first reference antenna, only a preferred embodiment of the invention, the other polarized antenna TiThe method implemented as said first reference antenna is the same as the method of the invention, other polarized antennas TiAll fall within the scope of the embodiments of the present invention.
Step 1012, completing the polarized antenna T in turn1And a polarized antenna TiRespectively obtaining the calibration signal Y1,i(k) And a calibration signal Yi,1(k) Wherein the calibration signal Y1,i(k) For polarizing antenna TiReceived by polarized antenna T1A transmitted preset calibration signal Yi,1(k) For polarizing antenna T1Received by polarized antenna TiAnd sending a preset calibration signal.
Wherein the polarized antenna TiReceived by polarized antenna T1The transmitted preset calibration signal comprises: at a first preset moment, passing through said polarized antenna T1Sending a calibration signal Y1,3(k) For polarized antenna T3And through said polarized antenna T3Receiving the calibration signal Y1,3(k) In that respect Here, a calibration signal Y is obtained1,3(k) Time and polarization antenna T1Polarized antenna T with mutual polarization of RRU2The signal cannot be transmitted so as not to interfere with the reception of the calibration signal.
The polarized antenna TiReceived by polarized antenna TiPresetting of transmissionThe calibration signal includes: passing through said polarized antenna T during a time instant adjacent to said first preset time instant3For the calibration signal Y1,3(k) Sending a return to the polarized antenna T1Calibration signal Y of3,1(k) In that respect After obtaining the calibration signal Y3,1(k) And a polarized antenna T3Polarized antenna T with mutual polarization of RRU4The signal cannot be transmitted so as not to interfere with the reception of the calibration signal.
The first preset time and the adjacent time of the first preset time are used for avoiding the polarized antenna T1Polarization antenna T3Polarized antenna T1Polarization antenna T3The correction time difference is more, so that the problem that the air interface mutation influences the correction is solved, and the correction accuracy is improved.
Step 1013, calibrating the signal Y1,i(k) And a calibration signal Yi,1(k) And determining a first correction coefficient group of the k-th subcarrier.
Wherein the calibration signal Y1,i(k) And the calibration signal Yi,1(k) Both the amplitude and phase of the kth subcarrier channel carrying the baseband. And the calibration signal Y1,i(k) And the calibration signal Yi,1(k) The length of the OFDM symbol is 1 OFDM (orthogonal frequency Division Multiplexing) symbol, and the number of occupied subcarriers is the same as the data length of the subcarriers for transmitting the service.
In the embodiment of the invention, other polarized antennas in the same polarization mode are corrected through the first reference antenna, and the calibration aiming at the channel reciprocity is carried out instead of the calibration of a transmitting path or the calibration of a receiving path, so that the arrangement of extra hardware can be reduced, and the labor cost and the hardware cost are reduced.
In the method for calibrating a polarized antenna array channel according to the embodiment of the present invention, the step 102 includes:
step 1021, selecting polarized antenna T from said second type polarized antenna2As the second reference antenna, wherein2Other polarized antennas sharing RRU are denoted as TjWherein j is 4,6, …, 2n, n is more thanA positive integer equal to 2. This step preferably selects the polarized antenna T2As a second reference antenna, only a preferred embodiment of the invention, the other polarized antenna TjThe method implemented as a second reference antenna is the same as the method of the invention, the other polarized antennas TjAll fall within the scope of the embodiments of the present invention.
Step 1022, sequentially completing the polarized antenna T2And a polarized antenna TjRespectively obtaining the calibration signal Y2,j(k) And a calibration signal Yj,2(k) Wherein the calibration signal Y2,j(k) For polarizing antenna TjReceived by polarized antenna T2A transmitted preset calibration signal Yj,2(k) For polarizing antenna T2Received by polarized antenna TjAnd sending a preset calibration signal.
The polarized antenna TjReceived by polarized antenna T2The transmitted preset calibration signal comprises: at a second preset moment, passing through said polarized antenna T2Sending a calibration signal Y2,4(k) For polarized antenna T4And through said polarized antenna T4Receiving the calibration signal Y2,4(k) In that respect After obtaining the calibration signal Y2,4(k) Time and polarization antenna T2Polarized antenna T with mutual polarization of RRU1The signal cannot be transmitted so as not to interfere with the reception of the calibration signal.
The polarized antenna T2Received by polarized antenna TjThe transmitted preset calibration signal comprises: passing through said polarized antenna T during a time instant adjacent to said second preset time instant4For the calibration signal Y2,4(k) Sending a return to the polarized antenna T2Calibration signal Y of4,2(k) In that respect After obtaining the calibration signal Y4,2(k) Time and polarization antenna T4Polarized antenna T with mutual polarization of RRU3The signal cannot be transmitted so as not to interfere with the reception of the calibration signal.
It should also be noted that: the second preset moment and the adjacent moment of the second preset moment areIn order to avoid the occurrence of polarized antennas T2Polarization antenna T4Polarized antenna T4Polarization antenna T2The correction time difference is more, so that the problem that the air interface mutation influences the correction is solved, and the correction accuracy is improved.
1023, according to the calibration signal Y2,j(k) And said calibration signal Yj,2(k) And determining a second correction coefficient group of the k-th subcarrier.
Wherein the calibration signal Y2,j(k) And the calibration signal Yj,2(k) Both the amplitude and phase of the kth subcarrier channel carrying the baseband. And the calibration signal Y2,j(k) And the calibration signal Yj,2(k) The length of the OFDM symbol is 1 OFDM (orthogonal frequency Division Multiplexing) symbol, and the number of occupied subcarriers is the same as the data length of the subcarriers for transmitting the service.
In the embodiment of the invention, the other polarized antennas in the same polarization mode are corrected through the second reference antenna, and the calibration is directed at the reciprocity of the channel instead of the calibration of a transmitting path or the calibration of a receiving path, so that the arrangement of extra hardware can be reduced, and the labor cost and the hardware cost are reduced.
In the method for calibrating a polarized antenna array channel according to the embodiment of the present invention, step 103 includes:
step 1031, obtaining the correction signal Y received by the second reference antenna1,2(k) And acquiring a correction signal Y received by the first reference antenna2,1(k) Wherein the signal Y is corrected1,2(k) The correction signal Y is a predetermined calibration signal transmitted by the first reference antenna and received directly by the second reference antenna2,1(k) Is a predetermined calibration signal transmitted by the second reference antenna that is directly received by the first reference antenna.
The preset calibration signal transmitted by the first reference antenna and directly received by the second reference antenna comprises: at a third preset moment, sending a calibration signal Y through the first reference antenna1,2(k) Giving the second reference antenna and receiving the second reference antennaThe calibration signal Y1,2(k)。
The preset calibration signal directly received by the first reference antenna and transmitted by the second reference antenna comprises: within the adjacent preset time of the third preset time, aiming at the calibration signal Y through the second reference antenna1,2(k) Sending a return calibration signal Y2,1(k) And receiving the calibration signal Y through the first reference antenna2,1(k) Wherein the calibration signal Y1,2(k) And the calibration signal Y2,1(k) Respectively carrying the amplitude and phase of the kth subcarrier channel of the baseband.
It should be noted that: the third preset moment and the adjacent moment of the third preset moment are to avoid the polarized antenna T1Polarization antenna T2Polarized antenna T2Polarization antenna T1The correction time difference is more, so that the problem that the air interface mutation influences the correction is solved, and the correction accuracy is improved.
As shown in fig. 2, the first reference antenna 1 and the second reference antenna 2 share RRU, and the polarization isolation effect is not significant, so that the calibration requirement is satisfied. Specifically, the first reference antenna 1 and the second reference antenna 2 are mutually crossed polarized antennas, and transmit calibration signals to other polarized antennas through a transmission channel of the first reference antenna 1, or receive other calibration signals through a reception channel of the first reference antenna 1. And transmitting calibration signals to other polarized antennas through the transmitting channel of the second reference antenna 2, and receiving other calibration signals by the receiving channel of the second reference antenna 2.
And the polarized antennas of which the first reference antenna and the second reference antenna are mutually crossed are relatively close to each other due to mutual crossing, so that the polarized isolation effect is not obvious, and the correction requirement is met.
Step 1032, according to the correction signal Y1,2(k) And the correction signal Y2,1(k) And determining a third correction coefficient for the k-th subcarrier.
In the embodiment of the invention, because the selected polarized antennas with the first reference antenna and the second reference antenna crossed with each other have unobvious polarized isolation effect, the correction is carried out between the first reference antenna and the second reference antenna, and the correction efficiency is improved.
In the method for calibrating a polarized antenna array channel according to the embodiment of the present invention, step 103 includes:
step 1034, obtaining the correction signal Y received by the second reference antenna1,2(k) And acquiring a correction signal Y received by the first reference antenna2,1(k) Wherein the signal Y is corrected1,2(k) For the preset calibration signal transmitted by the first reference antenna received by the receiving radio frequency channel of the second reference antenna via the coupling correction network, the calibration signal Y2,1(k) The calibration signal is received by the receiving radio frequency channel of the first reference antenna via the coupling correction network and is sent by the second reference antenna.
The preset calibration signal transmitted by the first reference antenna and received by the receiving radio frequency channel of the second reference antenna through the coupling correction network includes: at a fourth preset moment, the calibration signal Y is transmitted through the first reference antenna via the coupling correction network1,2(k) A receiving RF channel for the second reference antenna, and receiving the calibration signal Y through the receiving RF channel of the second reference antenna1,2(k)。
The preset calibration signal transmitted by the second reference antenna and received by the receiving radio frequency channel of the first reference antenna through the coupling correction network includes: within the adjacent preset time of the fourth preset time, aiming at the calibration signal Y through the second reference antenna1,2(k) A calibration signal Y transmitted back to the first reference antenna receiving RF channel via the coupling correction network2,1(k) And receiving the calibration signal Y through the receiving RF channel of the first reference antenna2,1(k)。
It should be noted that: the fourth preset moment and the adjacent moment of the fourth preset moment are to avoid the polarized antenna T from appearing1Polarization antenna T2Polarized antenna T2Polarization antenna T1The correction time of the air interface is different, so that the air interface sudden change influencesThe correction accuracy is improved.
The polarized antennas of the first reference antenna and the second reference antenna which are mutually crossed and have a short distance, so that the polarized isolation effect is not obvious, and the correction requirement is met.
Step 1035, according to the correction signal Y1,2(k) And the correction signal Y2,1(k) And determining a third correction coefficient for the k-th subcarrier.
The matrix is: wherein the content of the first and second substances,
Figure BDA0000884829440000122
in the embodiment of the invention, the calibration between the reference antennas is carried out through a coupling calibration network of a first reference antenna and a second reference antenna of the RRU, so as to realize the reciprocity calibration of the TDD channel on the subcarrier.
Second embodiment
As shown in fig. 3, a specific implementation process of the polarized antenna array channel calibration according to the embodiment of the present invention is as follows. A schematic diagram of a 16-polarized antenna array channel is given below in conjunction with the figure and in conjunction with fig. 4, where antennas i and i +1 are co-RRU mutually polarized antennas. The whole correction process is as follows:
step 301, selecting a polarized antenna T1As a first reference antenna, a polarized antenna T is selected2As a second reference antenna.
Step 302, implementing a first reference antenna T1And TiSignal interaction of (2) to obtain Y1,i(k) And Yi,1(k) Wherein i is 3,5 … 15, determining a first correction coefficient group of the k-th subcarrier;
step 303, implementing a second reference antenna T2And TjSignal interaction of (2) to obtain Y2,j(k) And Yj,2(k) Wherein j is 4,6 … 16, determining a second correction coefficient group of the k-th subcarrier;
step 304, completing the third correction coefficient of the kth subcarrier between the first reference antenna and the second reference antenna.
Step 305, calculateA TDD channel reciprocity correction parameter matrix on the kth subcarrier, wherein the matrix is: wherein the content of the first and second substances,
Figure BDA0000884829440000124
it should be noted that: after correcting the parameter matrix, the subcarrier signals are subsequently compensated, as in the prior art, before the signals are transmitted, and each signal is multiplied by the correction coefficient of the matrix to achieve correction.
In the embodiment of the invention, a first reference antenna is selected from a first type of polarized antenna to correct other polarized antennas, a second reference antenna is selected from a second type of polarized antenna to correct other polarized antennas, the first reference antenna and the second reference antenna are mutually corrected to determine a correction coefficient matrix, and the obtained correction coefficient matrix is used for correcting a polarized antenna array channel, so that the correction effect is ensured, and the channel correction of the polarized antenna array is realized; and because the first reference antenna and the second reference antenna are polarized with each other, the influence of polarization isolation is small, and the correction effect is improved.
Third embodiment
As shown in fig. 5, the polarized antenna array channel calibration apparatus according to the embodiment of the present invention includes: a first type of polarized antenna having a first polarization and a second type of polarized antenna having a second polarization, the apparatus comprising:
a first selection determining module 501, configured to select at least one polarized antenna from the first type of polarized antenna as a first reference antenna, correct other polarized antennas except the first reference antenna according to the first reference antenna, and determine a first correction coefficient group of a kth subcarrier, where k is a subcarrier sequence number, and k is 1, 2, …, Nc, where Nc is the number of subcarriers;
the polarization mode of the first type of polarized antenna is different from the polarization mode of the second type of polarized antenna, and the first reference antenna and the second reference antenna are polarized with each other. This step preferably selects one of the polarized antennas from the first type of polarized antenna as the first reference antenna, which reduces the selection of multiple reference antennas and simplifies the complexity of calibration.
A second selection determining module 502, configured to select at least one polarized antenna from the second type of polarized antennas as a second reference antenna, correct other polarized antennas except the second reference antenna according to the second reference antenna, and determine a second correction coefficient set of a kth subcarrier;
a determining module 503, configured to correct the first reference antenna and the second reference antenna, and determine a third correction coefficient of a kth subcarrier;
a generating and correcting module 504, configured to generate a correction coefficient matrix corresponding to the kth subcarrier according to the first correction coefficient group, the second correction coefficient group, and the third correction coefficient, and perform correction on the polarized antenna array channel by using the obtained correction coefficient matrix.
In the embodiment of the invention, a first reference antenna is selected from a first type of polarized antenna to correct other polarized antennas, a second reference antenna is selected from a second type of polarized antenna to correct other polarized antennas, the first reference antenna and the second reference antenna are mutually corrected to determine a correction coefficient matrix, and the obtained correction coefficient matrix is used for correcting a polarized antenna array channel, so that the correction effect is ensured, and the channel correction of the polarized antenna array is realized; and because the first reference antenna and the second reference antenna are polarized with each other, the influence of polarization isolation is small, and the correction effect is improved.
It should be noted that the apparatus provided by the present invention is an apparatus applying the method for polarized antenna array channel calibration, and all embodiments of the method for polarized antenna array channel calibration are applicable to the apparatus and can achieve the same or similar beneficial effects.
In an apparatus for calibrating a polarized antenna array channel according to another embodiment of the present invention, the first selection determining module includes:
a first selection unit for selecting a polarized antenna T from said first type of polarized antenna1As a stationThe first reference antenna, wherein, the polarized antenna T1Other polarized antennas sharing RRU are denoted as TiWherein i is 3,5, …, 2 n-1, n is a positive integer greater than 2;
a first obtaining unit for sequentially completing the polarized antennas T1And a polarized antenna TiRespectively obtaining the calibration signal Y1,i(k) And a calibration signal Yi,1(k) Wherein the calibration signal Y1,i(k) For polarizing antenna TiReceived by polarized antenna T1A transmitted preset calibration signal Yi,1(k) For polarizing antenna T1Received by polarized antenna TiSending a preset calibration signal;
a first determination unit for determining the calibration signal Y1,i(k) And said calibration signal Yi,1(k) And determining a first correction coefficient group of the k-th subcarrier.
In the apparatus for calibrating a polarized antenna array channel according to another embodiment of the present invention, the second selection determining module includes:
a second selection unit for selecting a polarized antenna T from said second type of polarized antenna2As the second reference antenna, wherein2Other polarized antennas sharing RRU are denoted as TjWherein j is 4,6, …, 2n, n is a positive integer greater than or equal to 2;
a second obtaining unit for sequentially completing the polarized antennas T2And a polarized antenna TjRespectively obtaining the calibration signal Y2,j(k) And a calibration signal Yj,2(k) Wherein the calibration signal Y2,j(k) For polarizing antenna TjReceived by polarized antenna T2A transmitted preset calibration signal Yj,2(k) For polarizing antenna T2Received by polarized antenna TjSending a preset calibration signal;
a second determination unit for determining the calibration signal Y2,j(k) And said calibration signal Yj,2(k) Determining the kth subcarrierCorrection coefficient groups.
In the apparatus for calibrating a polarized antenna array channel according to another embodiment of the present invention, the determining module includes:
a first obtaining unit for obtaining the correction signal Y received by the second reference antenna1,2(k) And acquiring a correction signal Y received by the first reference antenna2,1(k) Wherein the signal Y is corrected1,2(k) The correction signal Y is a predetermined calibration signal transmitted by the first reference antenna and received directly by the second reference antenna2,1(k) The calibration signal is a preset calibration signal directly received by a first reference antenna and transmitted by a second reference antenna;
a third determination unit for determining the correction signal Y1,2(k) And the correction signal Y2,1(k) And determining a third correction coefficient for the k-th subcarrier.
In the apparatus for calibrating a polarized antenna array channel according to another embodiment of the present invention, the determining unit includes:
a second obtaining unit for obtaining the correction signal Y received by the second reference antenna1,2(k) And acquiring a correction signal Y received by the first reference antenna2,1(k) Wherein the signal Y is corrected1,2(k) For the preset calibration signal transmitted by the first reference antenna received by the receiving radio frequency channel of the second reference antenna via the coupling correction network, the calibration signal Y2,1(k) A preset calibration signal transmitted by a second reference antenna is received by a receiving radio frequency channel of a first reference antenna through a coupling correction network;
a fourth determination unit for determining the correction signal Y1,2(k) And the correction signal Y2,1(k) And determining a third correction coefficient for the k-th subcarrier.
The apparatus for calibrating a polarized antenna array channel is applied to a base station, and therefore, embodiments of the present invention further provide a base station, where the implementation embodiments of the apparatus for calibrating a polarized antenna array channel are all applicable to the embodiment of the base station, and can achieve the same technical effect.
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 (10)

1. A method of polarized antenna array channel correction, the polarized antenna array comprising: a first type of polarized antenna having a first polarization and a second type of polarized antenna having a second polarization, the method comprising:
selecting at least one polarized antenna from the first polarized antennas as a first reference antenna, correcting other polarized antennas except the first reference antenna according to the first reference antenna, and determining a first correction coefficient group of a k-th subcarrier, wherein k is a subcarrier serial number, k is 1, 2, …, and Nc is the number of subcarriers;
selecting at least one polarized antenna from the second polarized antennas as a second reference antenna, correcting other polarized antennas except the second reference antenna according to the second reference antenna, and determining a second correction coefficient group of a k-th subcarrier;
correcting the first reference antenna and the second reference antenna, and determining a third correction coefficient of a kth subcarrier;
generating a correction coefficient matrix corresponding to the k-th subcarrier according to the first correction coefficient group, the second correction coefficient group and the third correction coefficient, and performing correction of the polarized antenna array channel by using the obtained correction coefficient matrix, including:
according to the calibration signal Y1,i(k) And a calibration signal Yi,1(k) Determining a first correction coefficient group of the k-th subcarrier; calibration signal Y1,i(k) For polarizing antenna TiReceived by polarized antenna T1A transmitted preset calibration signal Yi,1(k) For polarizing antenna T1Received by polarized antenna TiPreset calibration of transmissionQuasi-signal, i ═ 1, 3,5, … 2 n-1, n is a positive integer;
according to the calibration signal Y2,j(k) And said calibration signal Yj,2(k) Determining a second correction coefficient group of the kth subcarrier; calibration signal Y2,j(k) For polarizing antenna TjReceived by polarized antenna T2A transmitted preset calibration signal Yj,2(k) For polarizing antenna T2Received by polarized antenna TjThe transmitted preset calibration signal j is 2, 4,6, 8, …, 2n, n is a positive integer;
according to the correction signal Y1,2(k) And the correction signal Y2,1(k) Determining a third correction factor for the k-th sub-carrier, correcting the signal Y1,2(k) The correction signal Y is a predetermined calibration signal transmitted by the first reference antenna and received directly by the second reference antenna2,1(k) Is a predetermined calibration signal transmitted by the second reference antenna that is directly received by the first reference antenna.
2. The method for polarized antenna array path correction of claim 1, wherein the selecting at least one polarized antenna from the first type of polarized antenna as a first reference antenna, correcting other polarized antennas except the first reference antenna according to the first reference antenna, and determining a first set of correction coefficients for a k-th subcarrier comprises:
selecting a polarized antenna T from said first type of polarized antenna1As the first reference antenna, wherein1Other polarized antennas sharing RRU are denoted as TiWherein i is 3,5, …, 2 n-1, n is a positive integer greater than 2;
sequentially completing the polarized antenna T1And a polarized antenna TiRespectively obtaining the calibration signal Y1,i(k) And a calibration signal Yi,1(k) Wherein the calibration signal Y1,i(k) For polarizing antenna TiReceived by polarized antenna T1A transmitted preset calibration signal, the calibration signalYi,1(k) For polarizing antenna T1Received by polarized antenna TiSending a preset calibration signal;
according to the calibration signal Y1,i(k) And said calibration signal Yi,1(k) And determining a first correction coefficient group of the k-th subcarrier.
3. The method for polarized antenna array path correction of claim 2, wherein the selecting at least one polarized antenna from the second type of polarized antenna as a second reference antenna, and determining a second set of correction coefficients for a k-th subcarrier based on the second reference antenna for correcting other polarized antennas except the second reference antenna comprises:
selecting a polarized antenna T from said polarized antennas of the second type2As the second reference antenna, wherein2Other polarized antennas sharing RRU are denoted as TjWherein j is 4,6, …, 2n, n is a positive integer greater than or equal to 2;
sequentially completing the polarized antenna T2And a polarized antenna TjRespectively obtaining the calibration signal Y2,j(k) And a calibration signal Yj,2(k) Wherein the calibration signal Y2,j(k) For polarizing antenna TjReceived by polarized antenna T2A transmitted preset calibration signal Yj,2(k) For polarizing antenna T2Received by polarized antenna TjSending a preset calibration signal;
according to the calibration signal Y2,j(k) And said calibration signal Yj,2(k) And determining a second correction coefficient group of the k-th subcarrier.
4. The method for polarized antenna array path correction of claim 3, wherein said correcting said first reference antenna and said second reference antenna to determine a third correction factor for a k-th subcarrier comprises:
obtaining a correction signal Y received by the second reference antenna1,2(k) And acquiring a correction signal Y received by the first reference antenna2,1(k) Wherein the signal Y is corrected1,2(k) The correction signal Y is a predetermined calibration signal transmitted by the first reference antenna and received directly by the second reference antenna2,1(k) The calibration signal is a preset calibration signal directly received by a first reference antenna and transmitted by a second reference antenna;
according to the correction signal Y1,2(k) And the correction signal Y2,1(k) And determining a third correction coefficient for the k-th subcarrier.
5. The method for polarized antenna array path correction of claim 3, wherein said correcting said first reference antenna and said second reference antenna to determine a third correction factor for a k-th subcarrier comprises:
obtaining a correction signal Y received by the second reference antenna1,2(k) And acquiring a correction signal Y received by the first reference antenna2,1(k) Wherein the signal Y is corrected1,2(k) For the preset calibration signal transmitted by the first reference antenna received by the receiving radio frequency channel of the second reference antenna via the coupling correction network, the calibration signal Y2,1(k) A preset calibration signal transmitted by a second reference antenna is received by a receiving radio frequency channel of a first reference antenna through a coupling correction network;
according to the correction signal Y1,2(k) And the correction signal Y2,1(k) And determining a third correction coefficient for the k-th subcarrier.
6. An apparatus for polarized antenna array channel correction, the polarized antenna array comprising: -a first type of polarized antenna having a same first polarization and a second type of polarized antenna having a same second polarization, characterized in that said device comprises:
a first selection determining module, configured to select at least one polarized antenna from the first type of polarized antenna as a first reference antenna, correct other polarized antennas except the first reference antenna according to the first reference antenna, and determine a first correction coefficient group of a kth subcarrier, where k is a subcarrier sequence number, and k is 1, 2, …, Nc, where Nc is the number of subcarriers;
a second selection determining module, configured to select at least one polarized antenna from the second type of polarized antennas as a second reference antenna, correct other polarized antennas except the second reference antenna according to the second reference antenna, and determine a second correction coefficient group of a kth subcarrier;
a determining module, configured to correct the first reference antenna and the second reference antenna, and determine a third correction coefficient of a kth subcarrier;
a generating and correcting module, configured to generate a correction coefficient matrix corresponding to a k-th subcarrier according to the first correction coefficient group, the second correction coefficient group, and the third correction coefficient, and perform correction on the polarized antenna array channel by using the obtained correction coefficient matrix, where,
according to the calibration signal Y1,i(k) And a calibration signal Yi,1(k) Determining a first correction coefficient group of the k-th subcarrier; calibration signal Y1,i(k) For polarizing antenna TiReceived by polarized antenna T1A transmitted preset calibration signal Yi,1(k) For polarizing antenna T1Received by polarized antenna TiThe method comprises the steps that a preset calibration signal is sent, i is 1, 3,5, … 2 n-1, and n is a positive integer; according to the calibration signal Y2,j(k) And said calibration signal Yj,2(k) Determining a second correction coefficient group of the kth subcarrier; calibration signal Y2,j(k) For polarizing antenna TjReceived by polarized antenna T2A transmitted preset calibration signal Yj,2(k) For polarizing antenna T2Received by polarized antenna TjThe transmitted preset calibration signal j is 2, 4,6, 8, …, 2n, n is a positive integer;
according to the correction signal Y1,2(k) And the correction signal Y2,1(k) Determining a third correction factor for the k-th sub-carrier, correcting the signal Y1,2(k) The correction signal Y is a predetermined calibration signal transmitted by the first reference antenna and received directly by the second reference antenna2,1(k) Is a predetermined calibration signal transmitted by the second reference antenna that is directly received by the first reference antenna.
7. The apparatus for polarized antenna array path correction of claim 6, wherein the first selection determination module comprises:
a first selection unit for selecting a polarized antenna T from said first type of polarized antenna1As the first reference antenna, wherein1Other polarized antennas sharing RRU are denoted as TiWherein i is 3,5, …, 2 n-1, n is a positive integer greater than 2;
a first obtaining unit for sequentially completing the polarized antennas T1And a polarized antenna TiRespectively obtaining the calibration signal Y1,i(k) And a calibration signal Yi,1(k) Wherein the calibration signal Y1,i(k) For polarizing antenna TiReceived by polarized antenna T1A transmitted preset calibration signal Yi,1(k) For polarizing antenna T1Received by polarized antenna TiSending a preset calibration signal;
a first determination unit for determining the calibration signal Y1,i(k) And said calibration signal Yi,1(k) And determining a first correction coefficient group of the k-th subcarrier.
8. The apparatus for polarized antenna array path correction of claim 7, wherein the second selection determination module comprises:
a second selection unit for selecting a polarized antenna T from said second type of polarized antenna2As the second reference antenna, wherein2Other polarized antennas sharing RRU are denoted as TjWherein j is 4,6, …, 2n, n is a positive integer greater than or equal to 2;
second bestTo a unit for completing the polarized antenna T in turn2And a polarized antenna TjRespectively obtaining the calibration signal Y2,j(k) And a calibration signal Yj,2(k) Wherein the calibration signal Y2,j(k) For polarizing antenna TjReceived by polarized antenna T2A transmitted preset calibration signal Yj,2(k) For polarizing antenna T2Received by polarized antenna TjSending a preset calibration signal;
a second determination unit for determining the calibration signal Y2,j(k) And said calibration signal Yj,2(k) And determining a second correction coefficient group of the k-th subcarrier.
9. The apparatus for polarized antenna array path correction of claim 8, wherein the means for determining comprises:
a first obtaining unit for obtaining the correction signal Y received by the second reference antenna1,2(k) And acquiring a correction signal Y received by the first reference antenna2,1(k) Wherein the signal Y is corrected1,2(k) The correction signal Y is a predetermined calibration signal transmitted by the first reference antenna and received directly by the second reference antenna2,1(k) The calibration signal is a preset calibration signal directly received by a first reference antenna and transmitted by a second reference antenna;
a third determination unit for determining the correction signal Y1,2(k) And the correction signal Y2,1(k) And determining a third correction coefficient for the k-th subcarrier.
10. The apparatus for polarized antenna array channel calibration of claim 8, wherein the determining unit comprises:
a second obtaining unit for obtaining the correction signal Y received by the second reference antenna1,2(k) And acquiring a correction signal Y received by the first reference antenna2,1(k) Wherein the signal Y is corrected1,2(k) Received via the coupling correction network for the receiving radio frequency channel of the second reference antennaA predetermined calibration signal transmitted by the first reference antenna, the calibration signal Y2,1(k) A preset calibration signal transmitted by a second reference antenna is received by a receiving radio frequency channel of a first reference antenna through a coupling correction network;
a fourth determination unit for determining the correction signal Y1,2(k) And the correction signal Y2,1(k) And determining a third correction coefficient for the k-th subcarrier.
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