CN102148636B - Antenna calibration method and system - Google Patents

Abstract

The embodiment of the invention relates to the technical field of wireless communication, in particular to an antenna calibration method and an antenna calibration system, which are used for solving the problem in the prior art that a sampling signal may be deviated in antenna calibration to produce remarkable influence on baseband signal reception to further cause the heavy loss of calibration sequence signals and reduce the accuracy of a calibration coefficient, beamforming performance and direction of arrival (DOA) estimation accuracy. The method provided by the embodiment of the inventioncomprises that: a transmission side adds a periodic sequence into an original time domain sequence to obtain a first time domain sequence; the transmission side transmits the first time domain sequence to a receiving side; the receiving side determines a calibration sequence according to a second time domain sequence obtained by sampling; and the receiving side performs antenna calibration according to the calibration sequence. The transmission side adds the periodic sequence into the original time domain sequence to reduce the remarkable influence of sampling deviations on the baseband signal reception in the antenna calibration system, thereby reducing the loss of the calibration sequence signals.

Description

A kind of method and system of antenna calibration

Technical field

The present invention relates to wireless communication technology field, particularly a kind of method and system of antenna calibration.

Background technology

Antenna system suppresses advantages such as signal interference, at TD-SCDMA (Time Division Synchronized Code Division Multiple Access because it has the raising cell coverage area; The time-division synchronization CDMA; CDMA, Code Division Multiple Access, code division multiple access) be extensive use of in the mobile communication system, and at LTE (Long Term Evolution, Long Term Evolution) and in LTE-A (LongTerm Evolution-Advanced, the long-term evolution upgrading) communication system can continue use.Each bay radio-frequency channel characteristic that requires when smart antenna uses to form smart antenna is consistent, there are differences because thereby the actual parameter of the radio-frequency devices of different array elements there are differences the radio-frequency channel magnitude-phase characteristics that causes each bay, therefore adopt in the system of smart antenna all to have the antenna calibration function.

As shown in Figure 1, intelligent antenna calibration system comprises: one or more radio-frequency transmissions passage and radio frequency reception channel; The transmitting-receiving coupling channel; Calibration receive path and transmission channel; The calibrating signal processor; Baseband signal processor etc.

The antenna calibration algorithm is by receipts calibrating signal or a calibrating signal are carried out channel estimating, time domain or the frequency domain response of estimated result being used as the radio-frequency channel calculate calibration factor, because sampling deviation can influence the reception of baseband signal when signal receives, thereby cause the loss of signal of calibrating sequence, finally cause the calculating of calibration factor inaccurate, influence wave beam forming performance and DOA (Direction Of Arrival, arrival direction) estimated accuracy.

In sum, sampled signal deviation can occur and then receiving baseband signal is produced significantly influence in the antenna calibration at present, thereby causes the calibrating sequence loss of signal serious, reduces accuracy, wave beam forming performance and the DOA estimated accuracy of calibration factor.

Summary of the invention

The method and system of a kind of antenna calibration that the embodiment of the invention provides, sampled signal deviation can occur and then receiving baseband signal is produced significantly influence in the antenna calibration that exists in the prior art in order to solve, thereby cause the calibrating sequence loss of signal serious, reduce the problem of accuracy, wave beam forming performance and the DOA estimated accuracy of calibration factor.

The method of a kind of antenna calibration that the embodiment of the invention provides comprises:

Transmitter side adds cyclic sequence in original time domain sequences, obtain first time domain sequences;

Described transmitter side sends described first time domain sequences to receiver side;

Described receiver side is determined calibrating sequence according to second time domain sequences that sampling obtains;

Described receiver side carries out antenna calibration according to calibrating sequence.

The system of a kind of antenna calibration that the embodiment of the invention provides comprises:

Sending module is used for adding cyclic sequence in original time domain sequences and obtains first time domain sequences, sends described first time domain sequences;

Receiver module is used for determining calibrating sequence according to second time domain sequences that sampling obtains, and carries out antenna calibration according to calibrating sequence.

Because transmitter side adds cyclic sequence in original time domain sequences, can be in antenna calibration system, reduce owing to sampling deviation produces significantly influence to receiving baseband signal, thereby reduce the loss of calibrating sequence signal, improve the accurate and antenna calibration precision of calibration factor; Further improve performance and the DOA estimated accuracy of wave beam forming.

Description of drawings

Fig. 1 is the intelligent antenna calibration system schematic diagram;

Fig. 2 is the method flow schematic diagram of embodiment of the invention antenna calibration;

Fig. 3 sends the Calibration Method schematic flow sheet for the embodiment of the invention;

Fig. 4 receives the Calibration Method schematic flow sheet for the embodiment of the invention;

Fig. 5 is the system configuration schematic diagram of embodiment of the invention antenna calibration.

Embodiment

Embodiment of the invention transmitter side sends by adding first time domain sequences that cyclic sequence obtains in the original time domain sequences, and receiver side is determined calibrating sequence and carried out antenna calibration according to the time domain sequences that sampling obtains.If sampling shifts to an earlier date or lags behind, understanding some signal sampling point does not gather, and transmitter side adds after the cyclic sequence in original time domain sequences, can reduce the loss that the data sampling point is subjected to, can in antenna calibration system, reduce because sampling deviation produces significantly influence to receiving baseband signal, thereby reduce the loss of calibrating sequence signal.

Below in conjunction with Figure of description the embodiment of the invention is described in further detail.

As shown in Figure 2, the method for embodiment of the invention antenna calibration comprises the following steps:

Step 201, transmitter side add cyclic sequence in original time domain sequences, obtain first time domain sequences.

Step 202, transmitter side send first time domain sequences to receiver side.

Step 203, receiver side are determined calibrating sequence according to second time domain sequences that sampling obtains.

Step 204.Receiver side carries out antenna calibration according to calibrating sequence.

In the step 201, transmitter side adds cyclic sequence in original time domain sequences position can have multiple, such as the front in original time domain sequences; Back in original time domain sequences; Front and back in original time domain sequences.Below the branch situation describe.

Situation one, transmitter side add cyclic sequence in the front of original time domain sequences, and this cyclic sequence can be called CP (Cyclic Prefix).

Wherein, transmitter side need be determined cyclic sequence before the step 201.

Concrete, at first transmitter side determines that the length of cyclic sequence equals L _Cp1, L wherein _Cp1Be positive integer, M+N≤L _Cp1≤ L, L are the length of original time domain sequences, and M is the numerical value after rounding up divided by the sampling interval the maximum sampling lag deviation time, and N is that maximum sampling shifts to an earlier date the numerical value after the deviation time rounded up divided by the sampling interval, such as 5.4, is exactly 6 after rounding up; Such as being 6, be exactly 6 after rounding up, down together);

Transmitter side is with back L in the original time domain sequences then _Cp1The time domain data of position is formed cyclic sequence in order, and adds cyclic sequence the foremost of original time domain sequences to, forms first time domain sequences, specifically can represent with formula one.

$\left\{\begin{array}{c}{y}^{*}\left(i\right)=y(L-L_{\mathrm{cp}1}+i),0\≤i\≤L_{\mathrm{cp}1}-1\\ y^{*}\left(i\right)=y(i-L_{\mathrm{cp}1}),L_{\mathrm{cp}1}\≤i\≤L+L_{\mathrm{cp}1}-1\end{array}\right...........$ Formula one.

Wherein, L is original time domain sequences length, and y (i) is original time domain sequences, y ^*(i) be first time domain sequences.

Such as: back L in the original time domain sequences _Cp1The position is ABCD, and then ABCD adds the foremost to original time domain sequences to as cyclic sequence, and first time domain sequences of composition is the original time domain sequences of ABCD+.

L _Cp1Concrete numerical value set according to the sampling time delay scope of system.

Preferable, if cyclic sequence length is greater than sampling deviation, then data sampling point can not incur loss, sampling deviation is equivalent to add a cyclic shift to the influence of the back data of sampling, further reduce because sampling deviation produces significantly influence to receiving baseband signal, reduce the loss of calibrating sequence signal.

Accordingly, in the step 203, receiver side is known the length of cyclic sequence, i.e. L _Cp1Size.According to L _Cp1Size, and second time domain sequences that sampling obtains just can be determined calibrating sequence.Specifically there is dual mode to determine calibrating sequence.

Mode one, steps A 1, receiver side be from sampling initial time sampled data, and form second time domain sequences according to the order of sampling.

Steps A 2, receiver side are from the N of second time domain sequences that samples ₁Individual sampling is lighted L sampling number of intercepting according to (sampled point of initial time is called the 0th sampled point, down together), and forms sequence to be adjusted according to the order of intercepting, wherein N ₁Be positive integer, and N≤N ₁≤ L _Cp1-M.

Steps A 3, receiver side move L to sequence big-endian circulation to be adjusted _Cp1-N ₁The position obtains calibrating sequence.

Concrete, in the steps A 1, receiver side begins to receive time domain data from the sampling initial time, and forms the second time domain sequences y (i), i=0,1, L, L+L according to the order of sampling _CP1-1.

In the steps A 2, receiver side is from the second time domain sequences N ₁L sampling number certificate of intercepting lighted in individual sampling, and forms sequence to be adjusted according to the order of intercepting

I=0,1, L, L-1.

In the steps A 3, receiver side moves L to sequence big-endian circulation to be adjusted _Cp1-N ₁The position obtains calibrating sequence, and concrete calibrating sequence can be by formula two expressions.

Formula two.

Mode two, step B1, receiver side are delayed N from the sampling initial time ₁* Ts rises constantly and begins to sample the L point data, and forms second time domain sequences, wherein N according to the order of sampling ₁Be positive integer, and N≤N ₁≤ L _Cp1-M, Ts are the sampling intervals.

Circulation moves L to the second time domain sequences big-endian for step B2, receiver side _Cp1-N ₁The position obtains calibrating sequence.

Concrete, among the step B1, receiver side is delayed N from the sampling initial time ₁* Ts rises constantly and begins to receive time domain data, and forms the second time domain sequences y (i), i=0,1, L, L-1 according to the order of sampling.

Among the step B2, circulation moves L to receiver side to the second time domain sequences big-endian _Cp1-N ₁The position obtains

As the calibrating sequence after the sampling.

Preferable, after mode one and mode two are removed cyclic sequence above adopting, when the subsequent calculations calibration factor, need use channel estimation value H, can compensate this moment to the time-domain cyclic shift operation, thereby further reduce because sampling deviation produces significantly influence to receiving baseband signal, reduce the loss of calibrating sequence signal.

Concrete, in the step 204, receiver side is determined channel estimation value according to calibrating sequence, and compensates according to formula three, carries out antenna calibration according to the road estimated value after the compensation.

H ₁=H * e ^{J2 π kn}... .... formula three.

Wherein, H ₁Be the channel estimation value after the compensation,

K is the subcarrier sequence number, and H is k subcarrier channel estimation, N _FFTTotal sampling number when doing the FFT conversion when being time-frequency conversion;

In force, the frequency domain channel estimated value on each subcarrier of being determined by calibrating sequence according to three pairs of formula of receiver side compensates.

Situation two, transmitter side add cyclic sequence in the back of original time domain sequences, and this cyclic sequence can be called cyclic suffix.

Wherein, transmitter side need be determined cyclic sequence before the step 201.

Concrete, at first transmitter side determines that the length of cyclic sequence equals L _Cp2, L _Cp2Be positive integer, M+N≤L wherein _Cp2≤ L, L are the length of original time domain sequences, and M is the maximum sampling lag deviation time divided by the numerical value in sampling interval, and N is the maximum sampling numerical value that rounds up divided by the sampling interval of deviation time in advance;

Transmitter side is with preceding L in the original time domain sequences then _Cp2The time domain data of position is formed cyclic sequence in order, and adds cyclic sequence to original time domain sequences backmost, forms first time domain sequences, specifically can represent with formula four.

$\left\{\begin{array}{c}{y}^{*}\left(i\right)=y\left(i\right),0\≤i\≤L-1\\ y^{*}\left(i\right)=y(i-L),L\≤i\≤L+L_{\mathrm{cp}2}-1\end{array}\right...........$ Formula four.

Wherein, L is original time domain sequences length, and y (i) is original time domain sequences, y ^*(i) be first time domain sequences.

Such as: L before in the original time domain sequences _Cp2The position is ABC, and then ABC adds to original time domain sequences backmost as cyclic sequence, and first time domain sequences of composition is original time domain sequences+ABC.

The concrete numerical value of Lcp2 is set according to the sampling time delay scope of system.

Preferable, if cyclic sequence length is greater than sampling deviation, then data sampling point can not incur loss, sampling deviation is equivalent to add a cyclic shift to the influence of the back data of sampling, further reduce because sampling deviation produces significantly influence to receiving baseband signal, reduce the loss of calibrating sequence signal.

Accordingly, in the step 203, receiver side is known the length of cyclic sequence, i.e. L _Cp2Size.According to L _Cp2Size, and second time domain sequences that sampling obtains just can be determined calibrating sequence.Specifically there are four kinds of modes to determine calibrating sequence.

Mode one, step C1, receiver side be from sampling initial time sampled data, and form second time domain sequences according to the order of sampling.

Step C2, receiver side are from the N of second time domain sequences ₂L sampling number certificate of intercepting lighted in individual sampling, and forms sequence to be adjusted, wherein N according to the order of intercepting ₂Be positive integer, and N≤N ₂≤ L _Cp2-M.

Step C3, receiver side move N to sequence little-endian circulation to be adjusted ₂The position obtains calibrating sequence.

Concrete, among the step C1, receiver side begins to receive time domain data from the sampling initial time, and forms the second time domain sequences y (i), i=0,1, L, L+L according to the order of sampling _CP2-1;

Among the step C2, receiver side is from the second time domain sequences N ₂L sampling number certificate of intercepting lighted in individual sampling, and forms sequence to be adjusted according to the order of intercepting

I=0,1, L, L-1.

Among the step C3, receiver side is circulated to a high position by low level to sequence to be adjusted and moves N ₂The position obtains calibrating sequence, and concrete calibrating sequence can be by formula five expressions.

Formula five.

Mode two, step D1, receiver side are delayed N from the sampling initial time ₂* Ts rises constantly and begins to sample the L point data, and forms second time domain sequences, wherein N according to the order of sampling ₂Be positive integer, and N≤N ₂≤ L _Cp2-M, Ts are the sampling intervals.

Circulation moves N to the second time domain sequences little-endian for step D2, receiver side ₂The position obtains calibrating sequence.

Concrete, among the step D1, receiver side is delayed N from the sampling initial time ₂* Ts rises constantly and begins to receive time domain data, and forms the second time domain sequences y (i), i=0,1, L, L-1 according to the order of sampling.

Among the step D2, circulation moves N to receiver side to the second time domain sequences little-endian ₂The position obtains

As the calibrating sequence after the sampling.

Preferable, after mode one and mode two are removed cyclic sequence above adopting, when the subsequent calculations calibration factor, need use channel estimation value H, can compensate this moment to the time-domain cyclic shift operation, thereby further reduce because sampling deviation produces significantly influence to receiving baseband signal, reduce the loss of calibrating sequence signal.

Concrete, in the step 204, receiver side is determined channel estimation value according to calibrating sequence, and compensates according to formula six, carries out antenna calibration according to the road estimated value after the compensation.

H ₂=H * e ^{-j2 π kn}... .... formula six.

Wherein, H ₂Be the channel estimation value after the compensation,

K is the subcarrier sequence number, and H is k subcarrier channel estimation, N _FFTTotal sampling number when doing the FFT conversion when being time-frequency conversion;

In force, the frequency domain channel estimated value on each subcarrier of being determined by calibrating sequence according to six pairs of formula of receiver side compensates.

Situation three, cyclic sequence comprise first cyclic sequence and second cyclic sequence, and transmitter side adds first cyclic sequence in the front of original time domain sequences, and transmitter side adds second cyclic sequence in the back of original time domain sequences.

Wherein, transmitter side need be determined cyclic sequence before the step 201.

Concrete, at first transmitter side determines that the length of first cyclic sequence equals L _Cp3, and determine that the length of second cyclic sequence equals L _Cp4, L wherein _Cp3Be positive integer, L _Cp4Be positive integer, N≤L _Cp3≤ L, M≤L _Cp4≤ L, L are the length of original time domain sequences, and M is the numerical value that rounds up divided by the sampling interval the maximum sampling lag deviation time, and N is that maximum sampling shifts to an earlier date the numerical value that the deviation time rounded up divided by the sampling interval;

Transmitter side is with back L in the original time domain sequences then _Cp3The time domain data of position is formed first cyclic sequence in order, and adds first cyclic sequence foremost of original time domain sequences to, and with L before in the original time domain sequences _Cp4The time domain data of position is formed second cyclic sequence in order, and adds second cyclic sequence to original time domain sequences backmost, forms first time domain sequences, specifically can represent with formula seven.

$\left\{\begin{array}{c}{y}^{*}\left(i\right)=y(L-L_{\mathrm{cp}3}+i),0\≤i\≤L_{\mathrm{cp}3}-1\\ y^{*}\left(i\right)=y(i-L_{\mathrm{cp}3}),L_{\mathrm{cp}3}\≤i\≤L+L_{\mathrm{cp}3}-1\\ y^{*}\left(i\right)=y(i-L-L_{\mathrm{cp}3}),L+L_{\mathrm{cp}3}\≤i\≤L+L_{\mathrm{cp}3}+L_{\mathrm{cp}4}-1\end{array}\right...........$ Formula seven.

Wherein, L is original time domain sequences length, and y (i) is original time domain sequences, y ^*(i) be first time domain sequences.

Such as: back L in the original time domain sequences _Cp3The position is ABCD, and then ABCD adds the foremost to original time domain sequences to as first cyclic sequence, preceding L in the original time domain sequences _Cp4The position is EFG, and then EFG adds to original time domain sequences backmost as second cyclic sequence, and first time domain sequences of composition is the original time domain sequences+EFG of ABCD+.

L _Cp1Concrete numerical value set according to the sampling time delay scope of system.

Preferable, if cyclic sequence length is greater than sampling deviation, then data sampling point can not incur loss, sampling deviation is equivalent to add a cyclic shift to the influence of the back data of sampling, further reduce because sampling deviation produces significantly influence to receiving baseband signal, reduce the loss of calibrating sequence signal.

Accordingly, in the step 203, receiver side is known the length of first cyclic sequence, i.e. L _Cp3Size, the length of second cyclic sequence, i.e. L _Cp4Size.According to L _Cp3And L _Cp4Size, and second time domain sequences that sampling obtains just can be determined calibrating sequence.Specifically there is dual mode to determine calibrating sequence.

Mode one, step e 1, receiver side be from sampling initial time sampled data, and form second time domain sequences according to the order of sampling.

Step e 2, receiver side are from the L of second time domain sequences _Cp3L sampling number certificate of intercepting lighted in individual sampling, and forms calibrating sequence according to the order of intercepting.

Concrete, in the step e 1, receiver side begins to receive time domain data from the sampling initial time, and forms the second time domain sequences y (i), 0≤i≤L according to the order of sampling _Cp3+ L _Cp4

In the step e 2, receiver side is from the second time domain sequences L _Cp3L sampling number certificate of intercepting lighted in individual sampling, and according to the order composition sequence that intercepts

I=0,1, L, L-1; Receiver side is with sequence As the calibrating sequence after the sampling.

Mode two, step F 1, receiver side are delayed L from the sampling initial time _Cp3* Ts rises constantly and begins to sample the L point data, and forms second time domain sequences according to the order of sampling, and wherein Ts is the sampling interval.

Step F 2, receiver side with second time domain sequences as calibrating sequence.

Concrete, in the step F 1, receiver side is delayed L from the sampling initial time _Cp3* Ts rises constantly and begins to receive time domain data, and forms the second time domain sequences y (i), i=0,1, L, L-1 according to the order of sampling.

In the step F 2, receiver side with sequences y (i) as the sampling after calibrating sequence.

Mode three, step G1, receiver side be from sampling initial time sampled data, and form second time domain sequences according to the order of sampling.

Step G2, receiver side are from the N of second time domain sequences ₃L sampling number certificate of intercepting lighted in individual sampling, and forms sequence to be adjusted, wherein N≤N according to the order of intercepting ₃≤ L _Cp3+ L _Cp4-M, and N ₃≠ L _Cp3

If step G3 is N ₃＜L _Cp3, then receiver side moves L to sequence big-endian circulation to be adjusted _Cp3-N ₃The position obtains calibrating sequence;

If N ₃＞L _Cp3, then receiver side moves N to sequence little-endian circulation to be adjusted ₃-L _Cp3The position obtains calibrating sequence.

Preferable, after mode three is removed cyclic sequence above adopting, when the subsequent calculations calibration factor, need use frequency domain channel estimated value H, can compensate this moment to the time-domain cyclic shift operation, thereby further reduce because sampling deviation produces significantly influence to receiving baseband signal, reduce the loss of calibrating sequence signal.

Concrete, if N ₃＜L _Cp3, then receiver side is determined channel estimation value according to calibrating sequence, and compensates according to formula eight, carries out antenna calibration according to the road estimated value after the compensation.

H ₃=H * e ^{J2 π kn}... .... formula eight.

Wherein, H ₁Be the channel estimation value after the compensation,

K is the subcarrier sequence number, and H is k subcarrier channel estimation, N _FFTTotal sampling number when doing the FFT conversion when being time-frequency conversion;

In force, the frequency domain channel estimated value on each subcarrier of being determined by calibrating sequence according to eight pairs of formula of receiver side compensates.

If N ₃＞L _Cp3, then receiver side is determined channel estimation value according to calibrating sequence, and compensates according to formula nine, carries out antenna calibration according to the road estimated value after the compensation:

H ₃=H * e ^{-j2 π kn}... .... formula nine.

Wherein, H ₃Be the frequency domain channel estimated value after the compensation, K is the subcarrier sequence number, and H is the frequency domain channel estimated value of k subcarrier, N _FFTTotal sampling number when doing the FFT conversion when being time-frequency conversion.

In force, the frequency domain channel estimated value on each subcarrier of being determined by calibrating sequence according to nine pairs of formula of receiver side compensates.

Mode four, step H1, receiver side are delayed N from the sampling initial time ₃* Ts constantly rises and begins to receive time domain data, and forms second time domain sequences, wherein N≤N according to the order of sampling ₃≤ L _Cp3+ L _Cp4-M, and N ₃≠ L _Cp3, Ts is the sampling interval.

If step H2 is N ₃＜L _Cp3, then circulation moves L to receiver side to the second time domain sequences big-endian _Cp3-N ₃The position obtains calibrating sequence;

If N ₃＞L _Cp3, then receiver side moves N to sequence little-endian circulation to be adjusted ₃-L _Cp3The position obtains calibrating sequence.

Preferable, after mode four is removed cyclic sequence above adopting, when the subsequent calculations calibration factor, need use frequency domain channel estimated value H, can compensate this moment to the time-domain cyclic shift operation, thereby further reduce because sampling deviation produces significantly influence to receiving baseband signal, reduce the loss of calibrating sequence signal.

Concrete, if N ₃＜L _Cp3, N in the method that then specifically compensates and the situation three ₃＜L _Cp3The method that compensates is identical, does not repeat them here.

If N ₃＞L _Cp3, N in the method that then specifically compensates and the situation three ₃＞L _Cp3The method that compensates is identical, does not repeat them here.

The mode of which kind of interpolation cyclic sequence and the length of cyclic sequence can be stipulated in agreement above concrete the employing, are perhaps consulted to determine by transmitter side and receiver side; Perhaps be configured in transmitter side and receiver side in advance respectively.

If what carry out is to send calibration, then transmitter side is baseband signal processor, and receiver side is the calibrating signal processor; If what carry out is to receive calibration, then transmitter side is the calibrating signal processor, and receiver side is baseband signal processor.

Being calibrated to example with transmission calibration and reception respectively below describes.

As shown in Figure 3, embodiment of the invention transmission Calibration Method comprises the following steps:

Step 301, baseband signal processor generate the radio-frequency channel calibrating sequence and are mapped on the subcarrier in frequency domain.

Step 302, baseband signal processor convert the frequency domain calibrating signal to the time domain baseband signal by the IFFT conversion.

Step 303, baseband signal processor send by each radio-frequency channel, road after time domain baseband signal (being original time domain sequences) is added cyclic sequence.

Step 304, baseband signal arrive calibrated channel through receiving coupling network.

Step 305, calibrating signal processor receive time domain data (being the time domain sequence) after each road stack by calibrated channel, and determine to remove the time domain data (being calibrating sequence) of cyclic sequence according to the time domain data of receiving.

The time domain data that step 306, calibrating signal processor will be removed behind the cyclic sequence transforms to frequency domain by FFT (FastFourier Transform, fast fourier transform).

Step 307, calibrating signal processor estimate that according to receiving signal each road sends time domain or the frequency domain characteristic of radio-frequency channel, calculates calibration factor, and sends to baseband signal processor.

Step 308, baseband signal processor carry out compensating coefficient in the signal emission process, guarantee that each road sends the amplitude-phase unanimity of radio-frequency channel.

As shown in Figure 4, the method for embodiment of the invention reception calibration flow process comprises the following steps:

Step 401, calibrating signal processor generate the radio-frequency channel calibrating sequence and are mapped on the subcarrier in frequency domain.

Step 402, calibrating signal processor convert the frequency domain calibrating signal to the time domain baseband signal by the IFFT conversion.

Step 403, calibrating signal processor send by calibrated channel after time domain baseband signal (being original time domain sequences) is added cyclic sequence.

Step 404, baseband signal arrive each road receiving RF channel through sending coupling network.

Step 405, baseband signal processor receive time domain data (being the time domain sequence) by each road receiving RF channel, and determine to remove the time domain data (being calibrating sequence) of cyclic sequence according to the time domain data of receiving

The time domain data that step 406, baseband signal processor will be removed behind the cyclic sequence transforms to frequency domain by FFT.

Step 407, baseband signal processor are estimated time domain or the frequency domain characteristic of each road receiving RF channel according to receiving signal, calculate calibration factor.

Step 408, baseband signal processor carry out compensating coefficient at the signal receiving course, guarantee the amplitude-phase unanimity of each road receiving RF channel.

Based on same inventive concept, a kind of system of antenna calibration also is provided in the embodiment of the invention, because the principle that this system deals with problems is similar to the method for antenna calibration, so the enforcement of this system can repeat part and repeat no more referring to the enforcement of method.

As shown in Figure 5, the system of embodiment of the invention antenna calibration comprises: sending module 10 and receiver module 20.

Sending module 10 is used for adding cyclic sequence in original time domain sequences and obtains first time domain sequences, sends first time domain sequences.

Receiver module 20 is used for determining calibrating sequence according to second time domain sequences that sampling obtains, and carries out antenna calibration according to calibrating sequence.

Sending module 10 adds cyclic sequence in original time domain sequences position can have multiple, such as the front in original time domain sequences; Back in original time domain sequences; Front and back in original time domain sequences.Below the branch situation describe.

Situation one, sending module 10 determine that the length of cyclic sequence equals L _Cp1, M+N≤L wherein _Cp1≤ L, L are the length of original time domain sequences, and M is the numerical value that rounds up divided by the sampling interval the maximum sampling lag deviation time, and N is that maximum sampling shifts to an earlier date the numerical value that the deviation time rounded up divided by the sampling interval; With back L in the original time domain sequences _Cp1The time domain data of position is formed cyclic sequence in order, and adds cyclic sequence the foremost of original time domain sequences to, forms first time domain sequences.

Accordingly, receiver module 20 is from sampling initial time sampled data, and forms second time domain sequences according to the order of sampling; N from second time domain sequences ₁L sampling number certificate of intercepting lighted in individual sampling, and forms sequence to be adjusted, wherein N according to the order of intercepting ₁Be positive integer, and N≤N ₁≤ L _Cp1-M; Sequence big-endian circulation to be adjusted is moved L _Cp1-N ₁The position obtains calibrating sequence.Perhaps

Receiver module 20 is delayed N from the sampling initial time ₁* Ts rises constantly and begins to sample the L point data, and forms second time domain sequences, wherein N according to the order of sampling ₁Be positive integer, and N≤N ₁≤ L _Cp1-M, Ts are the sampling intervals; Circulation moves L to the second time domain sequences big-endian _Cp1-N ₁The position obtains calibrating sequence.

Preferable, receiver module 20 is determined channel estimation value according to calibrating sequence; Compensate according to formula three; Carry out antenna calibration according to the channel estimation value after the compensation.

Situation two sending modules 10 determine that the length of cyclic sequence equals L _Cp2, M+N≤L wherein _Cp2≤ L, L are the length of original time domain sequences, and M is the numerical value that rounds up divided by the sampling interval the maximum sampling lag deviation time, and N is that maximum sampling shifts to an earlier date the numerical value that the deviation time rounded up divided by the sampling interval; With preceding L in the original time domain sequences _Cp2The time domain data of position is formed cyclic sequence in order, and adds cyclic sequence to original time domain sequences backmost, forms first time domain sequences.

Accordingly, receiver module 20 is from sampling initial time sampled data, and forms second time domain sequences according to the order of sampling; N from second time domain sequences ₂L sampling number certificate of intercepting lighted in individual sampling, and forms sequence to be adjusted, wherein N according to the order of intercepting ₂Be positive integer, and N≤N ₂≤ L _Cp2-M; Sequence little-endian circulation to be adjusted is moved N ₂The position obtains calibrating sequence.Perhaps

Receiver module 20 is delayed N from the sampling initial time ₂* Ts rises constantly and begins to sample the L point data, and forms second time domain sequences, wherein N according to the order of sampling ₂Be positive integer, and N≤N ₂≤ L _Cp2-M, Ts are the sampling intervals; Circulation moves N to the second time domain sequences little-endian ₂The position obtains calibrating sequence.

Preferable, receiver module 20 is determined channel estimation value according to calibrating sequence; Compensate according to formula six; Carry out antenna calibration according to the channel estimation value after the compensation.

Situation three, cyclic sequence comprise first cyclic sequence and second cyclic sequence; Sending module 10 determines that the length of first cyclic sequence equals L _Cp3, and determine that the length of second cyclic sequence equals L _Cp4, N≤L wherein _Cp3≤ L, M≤L _Cp4≤ L, L are the length of original time domain sequences, and M is the numerical value that rounds up divided by the sampling interval the maximum sampling lag deviation time, and N is that maximum sampling shifts to an earlier date the numerical value that the deviation time rounded up divided by the sampling interval; With back L in the original time domain sequences _Cp3The time domain data of position is formed first cyclic sequence in order, and adds first cyclic sequence foremost of original time domain sequences to, and with L before in the original time domain sequences _Cp4The time domain data of position is formed second cyclic sequence in order, and adds second cyclic sequence to original time domain sequences backmost, forms first time domain sequences.

Accordingly, receiver module 20 is from sampling initial time sampled data, and forms second time domain sequences according to the order of sampling; L from the second time domain sequences time domain sequences _Cp3L sampling number certificate of intercepting lighted in individual sampling, and forms calibrating sequence according to the order of intercepting, and wherein Ts is the sampling interval.Perhaps

Receiver module 20 is delayed L from the sampling initial time _Cp3* Ts rises constantly and begins to sample the L point data, and forms second time domain sequences according to the order of sampling, and wherein Ts is the sampling interval; With second time domain sequences as calibrating sequence.Perhaps

Receiver module 20 is from sampling initial time sampled data, and forms second time domain sequences according to the order of sampling; N from second time domain sequences ₃L sampling number certificate of intercepting lighted in individual sampling, and forms sequence to be adjusted, wherein N≤N according to the order of intercepting ₃≤ L _Cp3+ L _Cp4-M and N ₃≠ L _Cp3If N ₃＜L _Cp3, then receiver side moves L to sequence big-endian circulation to be adjusted _Cp3-N ₃The position obtains calibrating sequence; If N ₃＞L _Cp3, then receiver side moves N to sequence little-endian circulation to be adjusted ₃-L _Cp3The position obtains calibrating sequence.

Preferable, compensate if carry out 20 pairs of channel estimation values of cyclic shift receiver module.If N ₃＜L _Cp3, N in the mode three of the method that specifically compensates and Fig. 2 situation three ₃＜L _Cp3The method that compensates is identical, does not repeat them here.If N ₃＞L _Cp3, N in the mode three of the method that then specifically compensates and Fig. 2 situation three ₃＞L _Cp3The method that compensates is identical, does not repeat them here.

If what carry out is to send calibration, then sending module 10 is baseband signal processors, and receiver module 20 is calibrating signal processors; If what carry out is to receive calibration, then sending module 10 is calibrating signal processors, and receiver module 20 is baseband signal processors.

In concrete enforcement, the system of the antenna calibration of the embodiment of the invention can also be placed the base station, namely sending module 10 and receiver module 20 place the base station.

Those skilled in the art should understand that embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware embodiment, complete software embodiment or in conjunction with the form of the embodiment of software and hardware aspect.And the present invention can adopt the form of the computer program of implementing in one or more computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) that wherein include computer usable program code.

The present invention is that reference is described according to flow chart and/or the block diagram of method, equipment (system) and the computer program of the embodiment of the invention.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or the block diagram and/or square frame and flow chart and/or the block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, make the instruction of carrying out by the processor of computer or other programmable data processing device produce to be used for the device of the function that is implemented in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.

These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, make the instruction that is stored in this computer-readable memory produce the manufacture that comprises command device, this command device is implemented in the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.

These computer program instructions also can be loaded on computer or other programmable data processing device, make and carry out the sequence of operations step producing computer implemented processing at computer or other programmable devices, thereby be provided for being implemented in the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame in the instruction that computer or other programmable devices are carried out.

Although described the preferred embodiments of the present invention, in a single day those skilled in the art get the basic creative concept of cicada, then can make other change and modification to these embodiment.So claims are intended to all changes and the modification that are interpreted as comprising preferred embodiment and fall into the scope of the invention.

Because transmitter side adds cyclic sequence in original time domain sequences, can be in antenna calibration system, reduce owing to sampling deviation produces significantly influence to receiving baseband signal, thereby reduce the loss of calibrating sequence signal, improve the accurate and antenna calibration precision of calibration factor; Further improve performance and the DOA estimated accuracy of wave beam forming.

Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims (27)

1. the method for an antenna calibration is characterized in that, this method comprises:

Transmitter side adds cyclic sequence in original time domain sequences, obtain first time domain sequences;

Described transmitter side sends described first time domain sequences to receiver side;

Described receiver side is determined calibrating sequence according to second time domain sequences that sampling obtains;

Described receiver side carries out antenna calibration according to calibrating sequence;

Wherein, described transmitter side obtains first time domain sequences and comprises: described transmitter side determines that the length of cyclic sequence equals L _Cp1, L wherein _Cp1Be positive integer, M+N≤L _Cp1≤ L, L are the length of original time domain sequences, and M is the numerical value that rounds up divided by the sampling interval the maximum sampling lag deviation time, and N is that maximum sampling shifts to an earlier date the numerical value that the deviation time rounded up divided by the sampling interval; Described transmitter side is with back L in the original time domain sequences _Cp1The time domain data of position is formed cyclic sequence in order, and adds cyclic sequence the foremost of original time domain sequences to, forms first time domain sequences; Perhaps

Described transmitter side determines that the length of cyclic sequence equals L _Cp2, L wherein _Cp2Be positive integer, M+N≤L _Cp2≤ L, L are the length of original time domain sequences, and M is the numerical value that rounds up divided by the sampling interval the maximum sampling lag deviation time, and N is that maximum sampling shifts to an earlier date the numerical value that the deviation time rounded up divided by the sampling interval; Described transmitter side is with preceding L in the original time domain sequences _Cp2The time domain data of position is formed cyclic sequence in order, and adds cyclic sequence to original time domain sequences backmost, forms first time domain sequences; Perhaps

Described transmitter side determines that the length of first cyclic sequence equals L _Cp3, and determine that the length of second cyclic sequence equals L _Cp4, L wherein _Cp3Be positive integer, L _Cp4Be positive integer, N≤L _Cp3≤ L, M≤L _Cp4≤ L, L are the length of original time domain sequences, and M is the numerical value that rounds up divided by the sampling interval the maximum sampling lag deviation time, and N is that maximum sampling shifts to an earlier date the numerical value that the deviation time rounded up divided by the sampling interval; Described transmitter side is with back L in the original time domain sequences _Cp3The time domain data of position is formed first cyclic sequence in order, and adds first cyclic sequence foremost of original time domain sequences to, and with L before in the original time domain sequences _Cp4The time domain data of position is formed second cyclic sequence in order, and adds second cyclic sequence to original time domain sequences backmost, forms first time domain sequences.

2. the method for claim 1 is characterized in that, when described transmitter side by L after in original time domain sequences _Cp1The time domain data of position is formed cyclic sequence in order, and adds cyclic sequence the foremost of original time domain sequences to, and when forming first time domain sequences, described receiver side determines that calibrating sequence comprises:

Described receiver side is from sampling initial time sampled data, and forms second time domain sequences according to the order of sampling;

Described receiver side is from the N of described second time domain sequences ₁L sampling number certificate of intercepting lighted in individual sampling, and forms sequence to be adjusted, wherein N according to the order of intercepting ₁Be positive integer, and N≤N ₁≤ L _Cp1-M;

Described receiver side moves L to sequence big-endian circulation to be adjusted _Cp1-N ₁The position obtains calibrating sequence.

3. the method for claim 1 is characterized in that, when described transmitter side with original time domain sequences in after L _Cp1The time domain data of position is formed cyclic sequence in order, and by cyclic sequence being added to the foremost of original time domain sequences, when forming first time domain sequences, described receiver side determines that calibrating sequence comprises:

Described receiver side is delayed N from the sampling initial time ₁* Ts rises constantly and begins to sample the L point data, and forms second time domain sequences, wherein N according to the order of sampling ₁Be positive integer, and N≤N ₁≤ L _Cp1-M, Ts are the sampling intervals;

Circulation moves L to described receiver side to the second time domain sequences big-endian _Cp1-N ₁The position obtains calibrating sequence.

4. as the arbitrary described method of claim 1～3, it is characterized in that, when described transmitter side with original time domain sequences in after L _Cp1The time domain data of position is formed cyclic sequence in order, and by cyclic sequence being added to the foremost of original time domain sequences, when forming first time domain sequences, described receiver side carries out antenna calibration according to calibrating sequence and comprises:

Described receiver side is determined the frequency domain channel estimated value according to described calibrating sequence;

Described receiver side compensates according to following formula:

H ₁＝H×e ^j2πkn

Wherein, H ₁Be the frequency domain channel estimated value after the compensation,

K is the subcarrier sequence number, and H is k subcarrier channel estimation, N _FFTTotal sampling number when doing the FFT conversion when being time-frequency conversion;

Described receiver side carries out antenna calibration according to the channel estimation value after compensating.

5. the method for claim 1 is characterized in that, preceding L in described transmitter side passes through original time domain sequences _Cp2The time domain data of position is formed cyclic sequence in order, and adds cyclic sequence to original time domain sequences backmost, and when forming first time domain sequences, described receiver side determines that calibrating sequence comprises:

Described receiver side is from sampling initial time sampled data, and forms second time domain sequences according to the order of sampling;

Described receiver side is from the N of described second time domain sequences ₂L sampling number certificate of intercepting lighted in individual sampling, and forms sequence to be adjusted, wherein N according to the order of intercepting ₂Be positive integer, and N≤N ₂≤ L _Cp2-M;

Described receiver side moves N to sequence little-endian circulation to be adjusted ₂The position obtains calibrating sequence.

6. the method for claim 1 is characterized in that, preceding L in described transmitter side passes through original time domain sequences _Cp2The time domain data of position is formed cyclic sequence in order, and adds cyclic sequence to original time domain sequences backmost, and when forming first time domain sequences, described receiver side obtains calibrating sequence and comprises:

Described receiver side is delayed N from the sampling initial time ₂* Ts rises constantly and begins to sample the L point data, and forms second time domain sequences, wherein N according to the order of sampling ₂Be positive integer, and N≤N ₂≤ L _Cp2-M, Ts are the sampling intervals;

Circulation moves N to described receiver side to the second time domain sequences little-endian ₂The position obtains calibrating sequence.

7. as claim 1,5 or 6 described methods, it is characterized in that preceding L in described transmitter side passes through original time domain sequences _Cp2The time domain data of position is formed cyclic sequence in order, and adds cyclic sequence to original time domain sequences backmost, and when forming first time domain sequences, described receiver side carries out antenna calibration according to calibrating sequence and comprises:

Described receiver side is determined the frequency domain channel estimated value according to described calibrating sequence;

Described receiver side compensates according to following formula:

H ₂＝H×e ^-j2πkn

Wherein, H ₂Be the frequency domain channel estimated value after the compensation, K is the subcarrier sequence number, and H is the frequency domain channel estimated value of k subcarrier, N _FFTTotal sampling number when doing the FFT conversion when being time-frequency conversion;

Described receiver side carries out antenna calibration according to the channel estimation value after compensating.

8. the method for claim 1 is characterized in that, when described transmitter side with original time domain sequences in after L _Cp3The time domain data of position is formed first cyclic sequence in order, and adds first cyclic sequence foremost of original time domain sequences to, and with L before in the original time domain sequences _Cp4The time domain data of position is formed second cyclic sequence in order, and adds second cyclic sequence to original time domain sequences backmost, and when forming first time domain sequences, described receiver side determines that calibrating sequence comprises:

Described receiver side is from sampling initial time sampled data, and forms second time domain sequences according to the order of sampling;

Described receiver side is from the L of described second time domain sequences _Cp3L sampling number certificate of intercepting lighted in individual sampling, and forms calibrating sequence according to the order of intercepting.

9. the method for claim 1 is characterized in that, when described transmitter side with original time domain sequences in after L _Cp3The time domain data of position is formed first cyclic sequence in order, and adds first cyclic sequence foremost of original time domain sequences to, and with L before in the original time domain sequences _Cp4The time domain data of position is formed second cyclic sequence in order, and adds second cyclic sequence to original time domain sequences backmost, and when forming first time domain sequences, described receiver side obtains calibrating sequence and comprises:

Described receiver side is delayed L from the sampling initial time _Cp3* Ts rises constantly and begins to sample the L point data, and forms second time domain sequences according to the order of sampling, and wherein Ts is the sampling interval;

Described receiver side with described second time domain sequences as calibrating sequence.

10. the method for claim 1 is characterized in that, when described transmitter side with original time domain sequences in after L _Cp3The time domain data of position is formed first cyclic sequence in order, and adds first cyclic sequence foremost of original time domain sequences to, and with L before in the original time domain sequences _Cp4The time domain data of position is formed second cyclic sequence in order, and adds second cyclic sequence to original time domain sequences backmost, and when forming first time domain sequences, described receiver side obtains calibrating sequence and comprises:

Described receiver side is from sampling initial time sampled data, and forms second time domain sequences according to the order of sampling;

Described receiver side is from the N of second time domain sequences ₃L sampling number certificate of intercepting lighted in individual sampling, and forms sequence to be adjusted, wherein N≤N according to the order of intercepting ₃≤ L _Cp3+ L _Cp4-M, and N ₃≠ L _Cp3

If N ₃＜L _Cp3, described receiver side moves L to sequence big-endian circulation to be adjusted _Cp3-N ₃The position obtains calibrating sequence;

If N ₃L _Cp3, described receiver side moves N to sequence little-endian circulation to be adjusted ₃-L _Cp3The position obtains calibrating sequence.

11. the method for claim 1 is characterized in that, when described transmitter side with original time domain sequences in after L _Cp3The time domain data of position is formed first cyclic sequence in order, and adds first cyclic sequence foremost of original time domain sequences to, and with L before in the original time domain sequences _Cp4The time domain data of position is formed second cyclic sequence in order, and adds second cyclic sequence to original time domain sequences backmost, and when forming first time domain sequences, described receiver side obtains calibrating sequence and comprises:

Described receiver side is delayed N from the sampling initial time ₃* Ts constantly rises and begins to receive time domain data, and forms second time domain sequences, wherein N≤N according to the order of sampling ₃≤ L _Cp3+ L _Cp4-M, and N ₃≠ L _Cp3, Ts is the sampling interval;

If N ₃＜L _Cp3, circulation moves L to described receiver side to the second time domain sequences big-endian _Cp3-N ₃The position obtains calibrating sequence;

If N ₃L _Cp3, described receiver side moves N to sequence little-endian circulation to be adjusted ₃-L _Cp3The position obtains calibrating sequence.

12., it is characterized in that described receiver side carries out antenna calibration according to calibrating sequence and comprises as claim 10 or 11 described methods:

Described receiver side is determined the frequency domain channel estimated value according to described calibrating sequence;

If N ₃＜L _Cp3, described receiver side compensates according to following formula:

H ₃＝H×e ^j2πkn

Wherein, H ₃Be the frequency domain channel estimated value after the compensation,

K is the subcarrier sequence number, and H is k subcarrier channel estimation, N _FFTTotal sampling number when doing the FFT conversion when being time-frequency conversion;

If N ₃L _Cp3, described receiver side compensates according to following formula:

H ₃＝H×e ^-j2πkn

Wherein, H ₃Be the frequency domain channel estimated value after the compensation, K is the subcarrier sequence number, and H is the frequency domain channel estimated value of k subcarrier, N _FFTTotal sampling number when doing the FFT conversion when being time-frequency conversion;

Described receiver side carries out antenna calibration according to the channel estimation value after compensating.

13., it is characterized in that if described transmitter side is baseband signal processor, described receiver side is the calibrating signal processor as claim 1～3,5～6,8～11 arbitrary described methods;

If described transmitter side is the calibrating signal processor, described receiver side is baseband signal processor.

14. the system of an antenna calibration is characterized in that, this system comprises:

Sending module is used for adding cyclic sequence in original time domain sequences and obtains first time domain sequences, sends described first time domain sequences;

Receiver module is used for determining calibrating sequence according to second time domain sequences that sampling obtains, and carries out antenna calibration according to calibrating sequence;

Wherein, described sending module specifically is used for: the length of determining cyclic sequence equals L _Cp1, L wherein _Cp1Be positive integer, M+N≤L _Cp1≤ L, L are the length of original time domain sequences, and M is the numerical value that rounds up divided by the sampling interval the maximum sampling lag deviation time, and N is that maximum sampling shifts to an earlier date the numerical value that the deviation time rounded up divided by the sampling interval; With back L in the original time domain sequences _Cp1The time domain data of position is formed cyclic sequence in order, and adds cyclic sequence the foremost of original time domain sequences to, forms first time domain sequences; The length of perhaps determining cyclic sequence equals L _Cp2, L wherein _Cp2Be positive integer, M+N≤L _Cp2≤ L, L are the length of original time domain sequences, and M is the numerical value that rounds up divided by the sampling interval the maximum sampling lag deviation time, and N is that maximum sampling shifts to an earlier date the numerical value that the deviation time rounded up divided by the sampling interval; With preceding L in the original time domain sequences _Cp2The time domain data of position is formed cyclic sequence in order, and adds cyclic sequence to original time domain sequences backmost, forms first time domain sequences; Perhaps

Described cyclic sequence comprises first cyclic sequence and second cyclic sequence; Described sending module specifically is used for: the length of determining first cyclic sequence equals L _Cp3, and determine that the length of second cyclic sequence equals L _Cp4, L wherein _Cp3Be positive integer, L _Cp4Be positive integer, N≤L _Cp3≤ L, M≤L _Cp4≤ L, L are the length of original time domain sequences, and M is the numerical value that rounds up divided by the sampling interval the maximum sampling lag deviation time, and N is that maximum sampling shifts to an earlier date the numerical value that the deviation time rounded up divided by the sampling interval; With back L in the original time domain sequences _Cp3The time domain data of position is formed first cyclic sequence in order, and adds first cyclic sequence foremost of original time domain sequences to, and with L before in the original time domain sequences _Cp4The time domain data of position is formed second cyclic sequence in order, and adds second cyclic sequence to original time domain sequences backmost, forms first time domain sequences.

15. system as claimed in claim 14 is characterized in that, L after described sending module specifically is used for original time domain sequences _Cp1The time domain data of position is formed cyclic sequence in order, and adds cyclic sequence the foremost of original time domain sequences to, and when forming first time domain sequences, described receiver module specifically is used for:

From sampling initial time sampled data, and form second time domain sequences according to the order of sampling; N from described second time domain sequences ₁L sampling number certificate of intercepting lighted in individual sampling, and forms sequence to be adjusted, wherein N according to the order of intercepting ₁Be positive integer, and N≤N ₁≤ L _Cp1-M; Sequence big-endian circulation to be adjusted is moved L _Cp1-N ₁The position obtains calibrating sequence.

16. system as claimed in claim 14 is characterized in that, L after described sending module specifically is used for original time domain sequences _Cp1The time domain data of position is formed cyclic sequence in order, and adds cyclic sequence the foremost of original time domain sequences to, and when forming first time domain sequences, described receiver module specifically is used for:

Delay N from the sampling initial time ₁* Ts rises constantly and begins to sample the L point data, and forms second time domain sequences, wherein N according to the order of sampling ₁Be positive integer, and N≤N ₁≤ L _Cp1-M, Ts are the sampling intervals; Described second time domain sequences big-endian circulation is moved L _Cp1-N ₁The position obtains calibrating sequence.

17., it is characterized in that L after described sending module specifically is used for original time domain sequences as the arbitrary described system of claim 14～16 _Cp1The time domain data of position is formed cyclic sequence in order, and adds cyclic sequence the foremost of original time domain sequences to, and when forming first time domain sequences, described receiver module specifically is used for:

Determine channel estimation value according to described calibrating sequence; Compensate according to following formula; Carry out antenna calibration according to the channel estimation value after the compensation;

H ₁＝H×e ^j2πkn

Wherein, H ₁Be the channel estimation value after the compensation,

K is the subcarrier sequence number, and H is k subcarrier channel estimation, N _FFTTotal sampling number when doing the FFT conversion when being time-frequency conversion.

18. system as claimed in claim 14 is characterized in that, L before described sending module specifically is used for original time domain sequences _Cp2The time domain data of position is formed cyclic sequence in order, and adds cyclic sequence to original time domain sequences backmost, and when forming first time domain sequences, described receiver module specifically is used for:

From sampling initial time sampled data, and form second time domain sequences according to the order of sampling; N from described second time domain sequences ₂L sampling number certificate of intercepting lighted in individual sampling, and forms sequence to be adjusted, wherein N according to the order of intercepting ₂Be positive integer, and N≤N ₂≤ L _Cp2-M; Sequence little-endian circulation to be adjusted is moved N ₂The position obtains calibrating sequence.

19. system as claimed in claim 14 is characterized in that, L before described sending module specifically is used for original time domain sequences _Cp2The time domain data of position is formed cyclic sequence in order, and adds cyclic sequence to original time domain sequences backmost, and when forming first time domain sequences, described receiver module specifically is used for:

Delay N from the sampling initial time ₂* Ts rises constantly and begins to sample the L point data, and forms second time domain sequences, wherein N according to the order of sampling ₂Be positive integer, and N≤N ₂≤ L _Cp2-M, Ts are the sampling intervals; Described second time domain sequences little-endian circulation is moved N ₂The position obtains calibrating sequence.

20., it is characterized in that L before described sending module specifically is used for original time domain sequences as claim 14,18 or 19 described systems _Cp2The time domain data of position is formed cyclic sequence in order, and adds cyclic sequence to original time domain sequences backmost, and when forming first time domain sequences, described receiver module specifically is used for:

Determine channel estimation value according to described calibrating sequence; Compensate according to following formula; Carry out antenna calibration according to the channel estimation value after the compensation;

H ₂＝H×e ^-j2πkn

Wherein, H ₂Be the channel estimation value after the compensation,

K is the subcarrier sequence number, and H is k subcarrier channel estimation, N _FFTTotal sampling number when doing the FFT conversion when being time-frequency conversion.

21. system as claimed in claim 14 is characterized in that, when described cyclic sequence comprises first cyclic sequence and second cyclic sequence, described sending module specifically is used for original time domain sequences back L _Cp3The time domain data of position is formed first cyclic sequence in order, and adds first cyclic sequence foremost of original time domain sequences to, and with L before in the original time domain sequences _Cp4The time domain data of position is formed second cyclic sequence in order, and adds second cyclic sequence to original time domain sequences backmost, and when forming first time domain sequences, described receiver module specifically is used for:

From sampling initial time sampled data, and form second time domain sequences according to the order of sampling; L from the described second time domain sequences time domain sequences _Cp3L sampling number certificate of intercepting lighted in individual sampling, and forms calibrating sequence according to the order of intercepting, and wherein Ts is the sampling interval.

22. system as claimed in claim 14 is characterized in that, when described cyclic sequence comprises first cyclic sequence and second cyclic sequence, described sending module specifically is used for original time domain sequences back L _Cp3The time domain data of position is formed first cyclic sequence in order, and adds first cyclic sequence foremost of original time domain sequences to, and with L before in the original time domain sequences _Cp4The time domain data of position is formed second cyclic sequence in order, and adds second cyclic sequence to original time domain sequences backmost, and when forming first time domain sequences, described receiver module specifically is used for:

Delay L from the sampling initial time _Cp3* Ts rises constantly and begins to sample the L point data, and forms second time domain sequences according to the order of sampling, and wherein Ts is the sampling interval; With described second time domain sequences as calibrating sequence.

23. system as claimed in claim 14 is characterized in that, when described cyclic sequence comprises first cyclic sequence and second cyclic sequence, described sending module specifically is used for original time domain sequences back L _Cp3The time domain data of position is formed first cyclic sequence in order, and adds first cyclic sequence foremost of original time domain sequences to, and with L before in the original time domain sequences _Cp4The time domain data of position is formed second cyclic sequence in order, and adds second cyclic sequence to original time domain sequences backmost, and when forming first time domain sequences, described receiver module specifically is used for:

From sampling initial time sampled data, and form second time domain sequences according to the order of sampling; N from second time domain sequences ₃L sampling number certificate of intercepting lighted in individual sampling, and forms sequence to be adjusted, wherein N≤N according to the order of intercepting ₃≤ L _Cp3+ L _Cp4-M, and N ₃≠ L _Cp3If N ₃＜L _Cp3, sequence big-endian circulation to be adjusted is moved L _Cp3-N ₃The position obtains calibrating sequence; If N ₃L _Cp3, sequence little-endian circulation to be adjusted is moved N ₃-L _Cp3The position obtains calibrating sequence.

24. system as claimed in claim 14 is characterized in that, when described cyclic sequence comprises first cyclic sequence and second cyclic sequence, described sending module specifically is used for original time domain sequences back L _Cp3The time domain data of position is formed first cyclic sequence in order, and adds first cyclic sequence foremost of original time domain sequences to, and with L before in the original time domain sequences _Cp4The time domain data of position is formed second cyclic sequence in order, and adds second cyclic sequence to original time domain sequences backmost, and when forming first time domain sequences, described receiver module specifically is used for:

Delay N from the sampling initial time ₃* Ts constantly rises and begins to receive time domain data, and forms second time domain sequences, wherein N≤N according to the order of sampling ₃≤ L _Cp3+ L _Cp4-M, and N ₃≠ L _Cp3, Ts is the sampling interval; If N ₃＜L _Cp3, circulation moves L to described receiver side to the second time domain sequences big-endian _Cp3-N ₃The position obtains calibrating sequence; If N ₃L _Cp3, described receiver side moves N to sequence little-endian circulation to be adjusted ₃-L _Cp3The position obtains calibrating sequence.

25. as claim 23 or 24 described systems, it is characterized in that described receiver module specifically is used for:

Determine the frequency domain channel estimated value according to described calibrating sequence;

If N ₃＜L _Cp3, compensate according to following formula:

H ₃＝H×e ^j2πkn

Wherein, H ₃Be the frequency domain channel estimated value after the compensation,

K is the subcarrier sequence number, and H is k subcarrier channel estimation, N _FFTTotal sampling number when doing the FFT conversion when being time-frequency conversion;

If N ₃L _Cp3, compensate according to following formula:

H ₃＝H×e ^-j2πkn

Wherein, H ₃Be the frequency domain channel estimated value after the compensation,

K is the subcarrier sequence number, and H is the frequency domain channel estimated value of k subcarrier, N _FFTTotal sampling number when doing the FFT conversion when being time-frequency conversion;

Carry out antenna calibration according to the channel estimation value after the compensation.

26., it is characterized in that if described sending module is baseband signal processor, described receiver module is the calibrating signal processor as claim 14～16,18～19,21～24 arbitrary described systems;

If described sending module is the calibrating signal processor, described receiver module is baseband signal processor.

27. as claim 14～16,18～19,21～24 arbitrary described systems, it is characterized in that the system of described antenna calibration is in the base station.

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