CN107579938B - A kind of channel equalization method of joint IQ compensation - Google Patents
A kind of channel equalization method of joint IQ compensation Download PDFInfo
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Abstract
The present invention provides a kind of channel equalization method of joint IQ compensation, by estimating channel parameter, IQ imbalance parameter, is then based on the channel parameter of estimation, IQ imbalance parameter passes through Digital Signal Processing progress IQ compensation and channel equalization.Method provided by the invention can be realized the IQ compensation and channel equalization of data.
Description
Technical field
The present invention relates to single-carrier wave frequency domain equalization technology fields, equal more particularly, to a kind of channel of joint IQ compensation
Weighing apparatus method.
Background technique
In wireless communication technique, a small size is designed, price is low, and mobile terminal low in energy consumption is always that hot spot is asked
Topic.And the transceiver of Direct Conversion is exactly a kind of scheme for meeting design requirement.The transceiver of Direct Conversion is in transmitting terminal by base
Band signal Direct Conversion is radiofrequency signal, is directly baseband signal by radiofrequency signal frequency conversion in receiving end.It is reduced during this
Intermediate-frequency section, thus the volume and price of equipment are reduced, power consumption also consequently reduces.
But Direct Conversion, due to the limitation of analog device, the phase difference of orthogonal I/Q two paths of signals is not complete
90 degree of difference, the amplitude gain of two paths of signals is also not identical, the two reasons will cause IQ uneven.Go out from hardware
Hair, selecting high performance analog device naturally can solve IQ imbalance problem, however its Gao Chengben, large volume to go out from hardware
Hair solve the problems, such as IQ it is unbalanced be not optimal scheme.Therefore from the means of Digital Signal Processing to IQ imbalance problem
Inhibited and compensated to be current optimal selection.
In SC-FDE system, signal transmits in wireless channel, will receive the multipath fading effect of wireless channel.Therefore
It needs to carry out the balanced distortion to reduce signal to signal in receiving end.
The present invention is exactly directed to two problems set forth above, and the unbalanced problem of IQ and signal equalization problem simultaneous are risen
Come, solves the problems, such as two above simultaneously by way of Digital Signal Processing.
Summary of the invention
The present invention gets up IQ imbalance problem of the existing technology and signal equalization problem simultaneous, passes through digital signal
The mode of processing solves the problems, such as two above simultaneously.
To realize the above goal of the invention, the technical solution adopted is that:
A kind of channel equalization method of joint IQ compensation, comprising the following steps:
S1. it is adjusted in format of the transmitting terminal to the data block of received input signal, makes data blockMeet formula:
In one data block, except the 1st and thePosition is set as outside 1, and other positions of data block are about the
Position is symmetrical；The length of N expression Discrete Fourier Transform；
S2. data block is carried out in transmitting terminal sending reception by wireless channel for data block after adding cyclic prefix to operate
End；
S3. after receiving end receives data-signal, the estimation of channel is carried out by the UW sequence isolated in data-signal,
Obtain the time domain estimated value h of channel parameterlsWith the estimated value k of IQ imbalance parameterls1、kls2、kls3、kls4；
S4. by the time domain estimated value h of channel parameterlsZero padding and DFT are carried out, the frequency domain estimated value G of channel is obtainedls、G1ls；
S5. by the IQ imbalance parameter k of acquisitionls1、kls2、kls3、kls4With Gls、G1lsMultiplying is carried out, signal G is obtained1
And G2:
G1=kls1×Gls+kls2×G1ls
G2=kls3×Gls+kls4×G1ls
S6. to signal G1And G2Carry out real and imaginary part from processing after, obtain signal g1、g2、g3、g4:
Wherein, real () expression takes real part to operate, and imag () expression takes imaginary part to operate；
S7. receiving end receives data-signal rm=[r1,r2,...,rN]TAfterwards, data-signal rm=[r1,r2,...,rN]T
DFT conversion is carried out after first carrying out serioparallel exchange, is converted to frequency-region signal R；
S8. frequency-region signal R is subjected to real and imaginary part from obtaining two paths of signals R after processingrAnd Ri, signal RrAnd RiWith g1、g2、
g3、g4Two paths of signals X is obtained after carrying out operationrAnd Xi:
S9. by two paths of signals XrAnd XiMerge into signal X, XrAs the signal real part of signal X, XiSignal as signal X
Imaginary part；X is the frequency-region signal by IQ compensation and channel equalization；
S10. IDFT is carried out to signal X to handle to obtain the time-domain signal s by IQ compensation and channel equalizationm。
Compared with prior art, the beneficial effects of the present invention are:
Method provided by the invention is then based on the letter of estimation by estimating channel parameter, IQ imbalance parameter
Road parameter, IQ imbalance parameter carry out IQ compensation and channel equalization by Digital Signal Processing.Method provided by the invention can
Realize the IQ compensation and channel equalization of data.
Detailed description of the invention
Fig. 1 is the schematic diagram of data block.
Fig. 2 is the flow chart of method provided by the invention.
Fig. 3 is the specific implementation schematic diagram of method provided by the invention.
Fig. 4 is equalization methods and the bit error rate comparison diagram for the method for only carrying out channel equalization of the invention.
Fig. 5 is the planisphere after system IQ compensating equalization and ZF equilibrium under 16QAM setting 1.
Fig. 6 is equalization methods of the present invention under different IQ imbalance parameters and a bit error rate for the method for progress channel equalization
Comparison diagram.
Fig. 7 is the planisphere after system IQ compensating equalization and ZF equilibrium under 16QAM setting 2.
Specific embodiment
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；
Below in conjunction with drawings and examples, the present invention is further elaborated.
Embodiment 1
As shown in Figure 1, it is involved in the present invention to the data block of input signal of method handled firstly the need of in receiving end
At the reversed UW sequence of 1--data sequence -1- reverse data sequence, the form of UW sequence.Wherein, data sequence is expressed asReverse data sequence is expressed asNdataFor data sequence
Length.Similarly, UW sequence is expressed as [P1 P2 P3 ... PL-1 PL]T, and reversed UW sequence is expressed as [PL PL-1 PL-2
... P2 P1]T, L is the length of UW sequence.
On the basis of above, as shown in Figure 2,3, method provided by the invention specifically includes the following steps:
S1. data block is carried out in transmitting terminal sending reception by wireless channel for data block after adding cyclic prefix to operate
End；
S2. after receiving end receives data-signal, the estimation of channel is carried out by the UW sequence isolated in data-signal,
Obtain the time domain estimated value h of channel parameterlsWith the estimated value k of IQ imbalance parameterls1、kls2、kls3、kls4；
S3. by the time domain estimated value h of channel parameterlsZero padding and DFT are carried out, the frequency domain estimated value G of channel is obtainedls、G1ls；
Wherein, frequency domain estimated value G is obtainedlsDetailed process is as follows:
S4. by the IQ imbalance parameter k of acquisitionls1、kls2、kls3、kls4With Gls、G1lsMultiplying is carried out, signal G is obtained1
And G2:
G1=kls1×Gls+kls2×G1ls
G2=kls3×Gls+kls4×G1ls
S5. to signal G1And G2Carry out real and imaginary part from processing after, obtain signal g1、g2、g3、g4:
Wherein, real () expression takes real part to operate, and imag () expression takes imaginary part to operate；
S6. receiving end receives data-signal rm=[r1,r2,...,rN]TAfterwards, data-signal rm=[r1,r2,...,rN]T
DFT conversion is carried out after first carrying out serioparallel exchange, is converted to frequency-region signal R:
Wherein Q is the length of data sequence.
S7. frequency-region signal R is subjected to real and imaginary part from obtaining two paths of signals R after processingrAnd Ri, signal RrAnd RiWith g1、g2、
g3、g4Two paths of signals X is obtained after carrying out operationrAnd Xi:
S8. by two paths of signals XrAnd XiMerge into signal X, XrAs the signal real part of signal X, XiSignal as signal X
Imaginary part；X is the frequency-region signal by IQ compensation and channel equalization: X=Xr+j×Xi；
S9. IDFT is carried out to signal X to handle to obtain the time-domain signal s by IQ compensation and channel equalizationm:
Q is the length of data sequence.
Embodiment 2
The present embodiment has carried out specific emulation experiment, the following institute of the setting parameter of emulation experiment to the method for embodiment 1
Show:
The result of experiment is as shown in FIG. 4,5,6, 7, and Fig. 4 is equalization methods and the method for only progress channel equalization of the invention
Bit error rate comparison diagram.Fig. 5 is the planisphere after system IQ compensating equalization and ZF equilibrium under 16QAM setting 1.Fig. 6 is difference
IQ imbalance parameter under equalization methods of the present invention and the method for only carrying out channel equalization a bit error rate comparison diagram.Fig. 7 is 16QAM
The planisphere after system IQ compensating equalization and ZF equilibrium under being arranged 2.
By the above experimental result picture can illustrate method provided by the invention have under different IQ imbalance parameters compared with
Good compensation effect, and its compensation effect will be got well compared with existing compensation method, can preferably improve the performance of system.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention
Protection scope within.
Claims (5)
1. a kind of channel equalization method of joint IQ compensation, it is characterised in that: the following steps are included:
S1. it is adjusted in format of the transmitting terminal to the data block of received input signal, makes data blockMeet formula:
In one data block, except the 1st and thePosition is set as outside 1, and other positions of data block are about thePosition is right
Claim；The length of N expression Discrete Fourier Transform；
S2. data block is carried out in transmitting terminal sending receiving end by wireless channel for data block after adding cyclic prefix to operate；
S3. after receiving end receives data-signal, the estimation of channel is carried out by the UW sequence isolated in data-signal, is obtained
The time domain estimated value h of channel parameterlsWith the estimated value k of IQ imbalance parameterls1、kls2、kls3、kls4；
S4. by the time domain estimated value h of channel parameterlsZero padding and DFT are carried out, the frequency domain estimated value G of channel is obtainedls、G1ls；
S5. by the IQ imbalance parameter k of acquisitionls1、kls2、kls3、kls4With Gls、G1lsMultiplying is carried out, signal G is obtained1And G2:
G1=kls1×Gls+kls2×G1ls
G2=kls3×Gls+kls4×G1ls
S6. to signal G1And G2Carry out real and imaginary part from processing after, obtain signal g1、g2、g3、g4:
Wherein, real () expression takes real part to operate, and imag () expression takes imaginary part to operate；
S7. receiving end receives data-signal rm=[r1,r2,...,rN]TAfterwards, data-signal rm=[r1,r2,...,rN]TIt is advanced
DFT conversion is carried out after row serioparallel exchange, is converted to frequency-region signal R；
S8. frequency-region signal R is subjected to real and imaginary part from obtaining two paths of signals R after processingrAnd Ri, signal RrAnd RiWith g1、g2、g3、g4
Two paths of signals X is obtained after carrying out operationrAnd Xi:
S9. by two paths of signals XrAnd XiMerge into signal X, XrAs the signal real part of signal X, XiSignal imaginary part as signal X；
X is the frequency-region signal by IQ compensation and channel equalization；
S10. IDFT is carried out to signal X to handle to obtain the time-domain signal s by IQ compensation and channel equalizationm。
2. the channel equalization method of joint IQ compensation according to claim 1, it is characterised in that: the step S4 obtains frequency
Domain estimated value GlsDetailed process is as follows:
Wherein L is the path number of multipath channel, hlsIt (n) is the time domain estimated value for living through zero padding and the channel parameter of DFT, Q
For the length of data sequence.
3. the channel equalization method of joint IQ compensation according to claim 1, it is characterised in that: the step S7 is carried out
DFT is converted to frequency-region signal R, and detailed process is as follows:
Wherein Q is the length of data sequence.
4. the channel equalization method of joint IQ compensation according to claim 1, it is characterised in that: signal X is indicated are as follows: X=Xr
+j×Xi。
5. the channel equalization method of joint IQ compensation according to claim 1, it is characterised in that: the step S10 is obtained
Time-domain signal smDetailed process is as follows:
Q is the length of data sequence.
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| CN108616469B (en) * | 2018-05-11 | 2020-10-02 | 东南大学 | Method and device for estimating and compensating IQ imbalance of receiving end of SC-FDE system |
| CN109525336A (en) * | 2018-10-29 | 2019-03-26 | 上海大学 | Based on the radio communication channel test method of frequency deviation measurement time domain compensation under asynchronous clock |
| CN114598392B (en) * | 2022-03-22 | 2024-03-15 | 中山大学 | High-precision synchronization method between multi-dimensional optical modulator branches |
| CN115021772B (en) * | 2022-05-27 | 2023-05-26 | 电子科技大学 | I/Q imbalance iterative estimation and compensation method suitable for frequency correlation |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101933229A (en) * | 2008-01-25 | 2010-12-29 | Nxp股份有限公司 | The improvement of radio receiver |
| US8462898B2 (en) * | 2008-06-30 | 2013-06-11 | Entropic Communications, Inc. | System and method for blind compensation and correction of transmitter IQ imbalance at the receiver |
| CN103475315A (en) * | 2013-09-12 | 2013-12-25 | 电子科技大学 | Method and device for improving linearity of radio frequency power amplifier |
| CN105847198A (en) * | 2016-03-15 | 2016-08-10 | 东南大学 | IQ imbalance estimation and compensation method of OFDM-WLAN radio frequency testing system |
| CN106161304A (en) * | 2016-04-01 | 2016-11-23 | 电子科技大学 | A kind of transmitting terminal IQ imbalance compensation method of joint channel estimation |
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| US20030231726A1 (en) * | 2002-06-12 | 2003-12-18 | Andreas Schuchert | Arrangement and method for frequency domain compensation of OFDM signals with IQ imbalance |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101933229A (en) * | 2008-01-25 | 2010-12-29 | Nxp股份有限公司 | The improvement of radio receiver |
| US8462898B2 (en) * | 2008-06-30 | 2013-06-11 | Entropic Communications, Inc. | System and method for blind compensation and correction of transmitter IQ imbalance at the receiver |
| CN103475315A (en) * | 2013-09-12 | 2013-12-25 | 电子科技大学 | Method and device for improving linearity of radio frequency power amplifier |
| CN105847198A (en) * | 2016-03-15 | 2016-08-10 | 东南大学 | IQ imbalance estimation and compensation method of OFDM-WLAN radio frequency testing system |
| CN106161304A (en) * | 2016-04-01 | 2016-11-23 | 电子科技大学 | A kind of transmitting terminal IQ imbalance compensation method of joint channel estimation |
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