CN108616469B - Method and device for estimating and compensating IQ imbalance of receiving end of SC-FDE system - Google Patents

Method and device for estimating and compensating IQ imbalance of receiving end of SC-FDE system Download PDF

Info

Publication number
CN108616469B
CN108616469B CN201810449170.6A CN201810449170A CN108616469B CN 108616469 B CN108616469 B CN 108616469B CN 201810449170 A CN201810449170 A CN 201810449170A CN 108616469 B CN108616469 B CN 108616469B
Authority
CN
China
Prior art keywords
data
imbalance
frequency domain
estimating
channel information
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201810449170.6A
Other languages
Chinese (zh)
Other versions
CN108616469A (en
Inventor
黄永明
徐家辉
高强
范特
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Southeast University
Original Assignee
Southeast University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Southeast University filed Critical Southeast University
Priority to CN201810449170.6A priority Critical patent/CN108616469B/en
Publication of CN108616469A publication Critical patent/CN108616469A/en
Application granted granted Critical
Publication of CN108616469B publication Critical patent/CN108616469B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03159—Arrangements for removing intersymbol interference operating in the frequency domain
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03891—Spatial equalizers

Abstract

The invention discloses a method and a device for estimating and compensating IQ imbalance of a receiving end of an SC-FDE system, wherein the method comprises the steps of carrying out stream analysis on modulated data at a transmitting end; the data block is added with CP and is received by a receiving end through wireless channel and noise interference; IQ imbalance is introduced into a received signal due to hardware damage at a radio frequency end. In the method, after a receiving end removes a CP (content provider) of data, the time domain data is FFT (fast Fourier transform) transformed to a frequency domain; estimating channel information by using pilot frequency data, and then obtaining an IQ imbalance parameter estimation value; then, the received signals are mirrored and combined, and frequency domain data of the original signals are estimated through LS; finally, the original data can be recovered after IFFT transformation and demodulation. The IQ imbalance parameter estimation and compensation method provided by the invention firstly utilizes pilot frequency data in a frequency domain, carries out separate estimation on IQ imbalance parameters and a channel, and then adopts a simple LS method to simultaneously compensate IQ imbalance and channel interference, and the method can be simultaneously suitable for SISO and MIMO systems.

Description

Method and device for estimating and compensating IQ imbalance of receiving end of SC-FDE system
Technical Field
The invention relates to a receiving end IQ imbalance estimation and compensation method and device of an SC-FDE system, belonging to the technical field of wireless communication systems.
Background
Down-conversion is a basic stage in all rf front-end architectures, and compared to the conventional superheterodyne front-end architecture, a direct-conversion receiver provides a good implementation. However, such a low-cost front-end may be very sensitive to analog component defects, mainly due to radio frequency impairments caused by manufacturing non-uniformities, such as IQ-imbalance, carrier frequency offset, phase noise, etc. In which IQ imbalance is divided into Frequency Independent (FI) and Frequency Dependent (FD), FI imbalance is mainly caused by non-ideality of Local Oscillator (LO), which is kept constant within the signal bandwidth. Ideally, the LO should produce I and Q branches of the same gain and 90 ° phase offset, however, in practice this is almost impossible and therefore results in FI imbalance. In contrast, the FD model considers both FI imbalance and FD imbalance, which are caused by unbalanced frequency responses of the I and Q paths, which vary with bandwidth. In the present invention, we only consider FI imbalance. As next generation wireless systems will require simpler, flexible and configurable front-ends, implementing the front-ends using scaled-down manufacturing techniques will make the impact of these imbalances more severe. The resulting distortion may cause a drastic degradation in performance and limit the achievable data rate, so these impairments should be adequately compensated for.
The single carrier frequency domain equalization (SC-FDE) technique can effectively combat the multipath effect, and is to transmit a time-domain modulation signal in a data block manner, each data block occupies the entire transmission bandwidth, and a receiving end equalizes a received signal in the frequency domain. The SC-FDE technology has the advantages of low peak-to-average power ratio (PAPR), insensitivity to frequency offset, high spectrum utilization rate and the like. A multiple-input multiple-output (MIMO) system is configured with multiple antennas at both the transmitting end and the receiving end, and the multiple-antenna system can increase the system capacity by a multiple without increasing the channel bandwidth. The combination of MIMO and SC-FDE technology can effectively resist channel frequency selective interference and increase the throughput of the system.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the situation that IQ imbalance exists at a receiving end of an SC-FDE system, the invention aims to provide an IQ imbalance estimation and compensation method and device based on pilot frequency data.
The technical scheme is as follows: in order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a receiving end IQ imbalance estimation and compensation method of an SC-FDE system comprises the following steps:
(1) the receiving end FFT transforms the time domain data after the cyclic prefix is removed to a frequency domain;
(2) superposing the frequency domain data of the pilot frequency data block and the mirror image, obtaining superposed data irrelevant to IQ imbalance by utilizing the relation between IQ imbalance parameters, and estimating channel information by adopting an LS method;
(3) substituting the obtained channel estimation and the mirror image thereof into the received frequency domain data, and estimating IQ imbalance parameters by using a pilot frequency data block;
(4) the method comprises the steps of mirroring frequency domain received data, merging the data, substituting IQ imbalance parameters and channel information, compensating the frequency domain data, and estimating the frequency domain data of a transmitted signal on a frequency domain through LS;
(5) and transforming the estimated value obtained on the frequency domain into a time domain by IFFT, and recovering the original sending data after demodulation.
The receiving end expresses frequency domain data Y (k, n) obtained after FFT of the received signal as:
Figure BDA0001657995480000021
where k denotes the kth data block, n denotes the nth data symbol of the frequency domain data block, Yj(k, n) is a value after FFT conversion of a received signal of a j-th antenna at a receiving end; si(k, n) are the values of the transmission signal of the ith antenna of the transmitting terminal after FFT; superscript # denotes mirror; w (k, n), U (k, n) are terms related to channel information and IQ imbalance parameters, and take values as:
Figure BDA0001657995480000026
wherein, αj＝(1+jexp(jθj))/2，βj＝(1-jexp(-jθj))/2，θjAndjis the phase and amplitude imbalance parameter at the jth receiving antenna; hji(k, n) is the channel frequency domain fading coefficient of the jth receiving antenna to the ith transmitting antenna;
Figure BDA0001657995480000022
is the noise interference term, V, of the jth antenna at the receiving endjAnd (k, n) is the value of the J-th antenna of the receiving end after the FFT of the additive white Gaussian noise.
The channel information estimation method in the step (2) comprises the following steps:
mirroring the frequency domain data Y (k, n), and mirroring Y (k, n) and Y#(k, n) superposition using IQ imbalance parameter relationships
Figure BDA0001657995480000023
Obtaining values not related to IQ imbalance
Figure BDA0001657995480000024
Figure BDA0001657995480000025
Stacking the nth data symbol of the pilot frequency data block to obtain:
Figure BDA0001657995480000031
wherein K represents the number of pilot data blocks, and V is an interference term related to noise;
estimating H by adopting an LS method:
Figure BDA0001657995480000032
the IQ imbalance parameter estimation method in the step (3) comprises the following steps:
channel information
Figure BDA0001657995480000033
And mirror image thereof
Figure BDA0001657995480000034
Substituting the frequency domain data Y of the j antennaj(k,n)：
Figure BDA0001657995480000035
Stacking all data symbols of K pilot data blocks received by the jth antenna in sequence, and changing the data symbols into a column vector form:
Figure BDA0001657995480000036
wherein
Figure BDA0001657995480000037
Figure BDA0001657995480000038
Consists of noise and channel estimation error;
estimating parameters α using LS methodjAnd βj：
Figure BDA0001657995480000039
The frequency domain data compensation method in the step (4) comprises the following steps:
taking its mirror image Y for Y (k, n)#(k, n) are combined to give:
Figure BDA00016579954800000310
Wa(k)、Ua(k) is a term related to channel information and IQ imbalance, and takes the values as:
Figure BDA0001657995480000041
obtaining S by LS methodaEstimated value of (a):
Figure BDA0001657995480000042
a device for realizing the IQ imbalance estimation and compensation method of the receiving end of the SC-FDE system comprises the following steps:
the FFT conversion module is used for FFT converting the time domain data after the cyclic prefix is removed to a frequency domain;
the channel information estimation module is used for superposing the frequency domain data of the pilot frequency data block and the mirror image, obtaining superposed data irrelevant to IQ imbalance by utilizing the relation between IQ imbalance parameters, and estimating channel information by adopting an LS method;
an IQ imbalance estimation module for substituting the obtained channel estimation and its mirror image into the received frequency domain data, and estimating IQ imbalance parameters by using the pilot frequency data block;
the IQ imbalance compensation module is used for merging the mirror images of the frequency domain received data, substituting IQ imbalance parameters and channel information, compensating the frequency domain data, and estimating the frequency domain data of the transmitted signals on the frequency domain through LS;
an IFFT conversion module used for IFFT converting the frequency domain data obtained by the IQ imbalance compensation module to a time domain;
and the demapping module is used for demodulating the IQ imbalance compensated time domain data to obtain original sending data.
Has the advantages that: the IQ imbalance parameter estimation and compensation method for the receiving end based on the SC-FDE technology communication system provided by the invention separately estimates the IQ imbalance parameter and the channel information in the frequency domain by utilizing the relation between the pilot frequency data and the IQ imbalance parameter. Then, the mirror image of the frequency domain receiving signal is obtained, the estimated IQ imbalance parameter and the channel information are substituted, and the simple LS estimation is adopted, so that the IQ imbalance and the interference of the channel to the signal can be compensated simultaneously, and the method can be simultaneously suitable for SISO and MIMO systems.
Drawings
FIG. 1 is a schematic diagram of an IQ imbalance compensation method for an SC-FDE system according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of IQ imbalance parameter estimation mean square error simulation according to an embodiment of the present invention
Fig. 3 is a schematic diagram illustrating a simulation of the data bit error rate after IQ imbalance compensation according to an embodiment of the present invention.
Detailed Description
The invention is further illustrated with reference to the following specific embodiments and the accompanying drawings.
As shown in FIG. 1, in the SC-FDE systemAfter the data is modulated at the transmitting end, the data is divided into stream numbers corresponding to the number of transmitting antennas through stream analysis. The CP is added on the data block, the data is sent out through the radio frequency end, the data sent on the ith antenna is si(k,t)。
Considering IQ imbalance parameters of a transmitting terminal, after wireless channel and additive noise interference, the signal of the jth receiving antenna is
Figure BDA0001657995480000051
Where k represents the kth data block and t represents the tth data symbol. h isjiRepresents the fading coefficient of the jth receiving antenna to the ith transmitting antenna, vjIs additive noise for the jth receive antenna,
Figure BDA0001657995480000052
representing the convolution of the signal.
IQ imbalance is introduced into a received time domain signal due to hardware damage of a radio frequency front end, the received signal is added into a conjugate term of an original signal, and a received signal y of a j antennajShould be that
Figure BDA0001657995480000053
α thereinjAnd βjAre the IQ imbalance related terms on the jth antenna, and their value is αj＝(1+jexp(jθj))/2，βj＝(1-jexp(-jθj))/2，θjAndjis the phase and amplitude imbalance parameter at the jth receiving antenna.
In view of the above situation, an embodiment of the present invention discloses a receiving end IQ imbalance estimation and compensation method for an SC-FDE system, which mainly includes the following steps:
(1) and after receiving the data with IQ imbalance introduced, the receiving end removes the CP and transforms the time domain data to the frequency domain through FFT. Removing CP from the data block, and FFT converting the data Y (k, n) into frequency domain
Figure BDA0001657995480000054
The superscript # indicates the mirror image,
Figure BDA0001657995480000055
is a data block of N data symbols, a mirror interference introduced by IQ imbalance
Figure BDA0001657995480000056
And SiThe relationship of (k, n) is
Figure BDA0001657995480000061
W (k, n), U (k, n) are terms related to channel information and IQ imbalance parameters, and take values as:
Figure BDA0001657995480000062
(2) the channel information is estimated using the pilot data block.
Mirroring the frequency domain data Y (k, n):
Figure BDA0001657995480000063
mixing Y (k, n) and Y#(k, n) superposition using IQ imbalance parameter relationships
Figure BDA0001657995480000064
Obtaining values not related to IQ imbalance
Figure BDA0001657995480000065
Figure BDA0001657995480000066
Stacking the nth data symbol of the pilot data block
Figure BDA0001657995480000067
K denotes the number of pilot data blocks and V is an interference term associated with noise. Estimating H by adopting an LS method:
Figure BDA0001657995480000068
(3) the obtained channel information
Figure BDA0001657995480000069
And mirror image thereof
Figure BDA00016579954800000610
Substituting the received frequency domain data to estimate the IQ imbalance parameters. The frequency domain signal on the jth receiving antenna is:
Figure BDA00016579954800000611
stacking N data symbols of K pilot data blocks received by a jth antenna in sequence to form a column vector:
Figure BDA0001657995480000071
wherein
Figure BDA0001657995480000072
Figure BDA0001657995480000073
Comprising noise and channel estimation error, we estimate parameters using the LS method αjAnd βj：
Figure BDA0001657995480000074
(4) Substituting the channel information and the IQ imbalance parameters into frequency domain data to compensate the frequency domain data, and rewriting the frequency domain receiving data as follows:
Figure BDA0001657995480000075
taking its mirror image Y for Y (k, n)#(k, n) are combined to give:
Figure BDA0001657995480000076
Wa(k)、Ua(k) is a term related to channel information and IQ imbalance, and takes the values as:
Figure BDA0001657995480000077
s can be obtained by simple LS methodaEstimated value of (a):
Figure BDA0001657995480000078
(5) after the estimated value of the frequency domain data block is obtained, the original data can be recovered after IFFT transformation and demapping.
Another embodiment of the present invention discloses a receiving end IQ imbalance estimation and compensation apparatus for an SC-FDE system, comprising: the FFT conversion module is used for FFT converting the time domain data after the cyclic prefix is removed to a frequency domain; the channel information estimation module is used for superposing the frequency domain data of the pilot frequency data block and the mirror image, obtaining superposed data irrelevant to IQ imbalance by utilizing the relation between IQ imbalance parameters, and estimating channel information by adopting an LS method; an IQ imbalance estimation module for substituting the obtained channel estimation and its mirror image into the received frequency domain data, and estimating IQ imbalance parameters by using the pilot frequency data block; the IQ imbalance compensation module is used for merging the mirror images of the frequency domain received data, substituting IQ imbalance parameters and channel information, compensating the frequency domain data, and estimating the frequency domain data of the transmitted signals on the frequency domain through LS; an IFFT conversion module used for IFFT converting the frequency domain data obtained by the IQ imbalance compensation module to a time domain; and the demapping module is used for demodulating the IQ imbalance compensated time domain data to obtain original sending data. The FFT module, the IFFT module, the demapping module, and the like are all mature modules in the existing communication system, and are not described herein again. For details of the IQ mismatch parameter estimation and IQ mismatch compensation module, reference may be made to the above method embodiments, and further description is omitted here.
The IQ imbalance parameter estimation and compensation method is further explained below with reference to specific matlab simulation examples and effects. The method mainly comprises the following steps:
1) the system is provided with two transmitting antennas and two receiving antennas. The data of the transmitting terminal is modulated by adopting a 16QAM mode, and 100 data blocks containing 256 sampling points are generated. In order to ensure the accuracy of IQ imbalance parameter and channel information estimation, the number of pilot data blocks K is 8-12, and data is subjected to stream analysis and divided into two streams with equal data volume.
2) Each data block is added with a CP with the length of 64, the length of the time delay of the channel is less than the length of the CP, and the channel is kept stable in the interval of continuous data blocks, regardless of IQ imbalance parameters of a transmitting end. The signals are received on two antennas after the signals pass through a channel and are added with additive white Gaussian noise interference
Figure BDA0001657995480000081
Figure BDA0001657995480000082
IQ imbalance introduced by considering received time domain signals due to hardware damage of radio frequency front end
y1(k,t)＝α1r1(k,t)+β1r1 *(k,t)
Figure BDA0001657995480000083
α thereinj＝(1+jexp(jθj))/2，βj＝(1-jexp(-jθj) 2) of the first receiving antenna is theta1＝3°，11.2; the phase and amplitude imbalance parameters of the second receiving antenna are theta2＝2°，2＝1.3。
3) At the receiving end, the CP is removed from the data block, and the data after being transformed into the frequency domain through the FFT of 256 points is
Figure BDA0001657995480000091
Wherein (·)TDenoting transposition, W (k, n) and U (k, n) are parameters related to IQ imbalance parameters and channels:
Figure BDA0001657995480000092
mirroring Y (k, n):
Figure BDA0001657995480000093
mixing Y (k, n) and Y#(k, n) superposition using IQ imbalance parameter relationships
Figure BDA0001657995480000094
Obtaining values not related to IQ imbalance
Figure BDA0001657995480000095
Figure BDA0001657995480000096
Wherein
Figure BDA0001657995480000097
H#(k, n) is a mirror image of H (k, n). Can utilize
Figure BDA0001657995480000098
To estimate the channel, however
Figure BDA0001657995480000099
Generating only one equation to estimate H (k, n) and H#(k,n)，
Figure BDA00016579954800000910
Comprising two parameters, H (k, n) and H#(K, n) contains eight parameters, in order to ensure the accuracy of estimation, it needs to generate multiple identical equations to estimate the channel, so the value range of the number K of the pilot data blocks is 8-12, therefore we stack the nth data symbol of the pilot data block
Figure BDA00016579954800000911
Estimating H by adopting an LS method:
Figure BDA00016579954800000912
4) the obtained channel information
Figure BDA00016579954800000913
And mirror image thereof
Figure BDA00016579954800000914
Substituting the received frequency domain data to estimate the IQ imbalance parameters. The frequency domain signals on the 1 st receiving antenna are:
Figure BDA0001657995480000101
stacking N data symbols of K pilot data blocks in sequence to form a column vector:
Figure BDA0001657995480000102
wherein
Figure BDA0001657995480000103
Figure BDA0001657995480000104
Comprising noise and channel estimation error, we estimate parameters using the LS method α1And β1：
Figure BDA0001657995480000105
The same method can also be applied to IQ imbalance parameter α of the 2 nd antenna2And β2Estimating, IQ imbalance parameter estimation mean square error
Figure BDA0001657995480000106
When the number of pilot data is 8, 10, and 12, respectively, the variation curve of the error of the IQ imbalance parameter estimation with the SNR is shown in fig. 2.
5) Substituting the channel information estimated from 10 pilot frequency data and IQ imbalance parameters into frequency domain data to compensate the frequency domain data, and rewriting the frequency domain received data as follows:
Figure BDA0001657995480000107
Wa(k)、Ua(k) the terms related to channel information and IQ imbalance are:
Figure BDA0001657995480000108
taking its mirror image Y for Y (k, n)#(k, n) are combined to give:
Figure BDA0001657995480000109
s can be obtained by simple LS methodaEstimated value of (a):
Figure BDA0001657995480000111
6) number estimatedAccording to
Figure BDA0001657995480000112
Taking out the estimated value of the original data
Figure BDA0001657995480000113
And the original data can be recovered after IFFT transformation and demapping.
The estimated bit data is compared with the original data, the bit error rate under different signal to noise ratios is calculated, and the simulation result is shown in fig. 3. The method is compared with the situation that IQ imbalance does not exist at the receiving end and IQ imbalance is not compensated, so that the serious influence on the system performance caused by the IQ imbalance can be seen, and after the IQ imbalance is compensated by using the method, the bit error rate is close to the ideal situation.
To sum up, the method is suitable for the condition that the receiving and transmitting end of the wireless communication system has frequency uncorrelated IQ imbalance, uses the pilot frequency data block to separately estimate IQ imbalance parameters and channel information in the frequency domain, then substitutes the estimated information into the frequency domain data, and can simultaneously compensate the IQ imbalance parameters and channel interference by adopting a simple LS method, and the method has good adaptability to the MIMO system.

Claims (3)

1. A receiving end IQ imbalance estimation and compensation method of an SC-FDE system is characterized by comprising the following steps:
(1) the receiving end FFT transforms the time domain data after the cyclic prefix is removed to a frequency domain;
(2) superposing the frequency domain data of the pilot frequency data block and the mirror image, obtaining superposed data irrelevant to IQ imbalance by utilizing the relation between IQ imbalance parameters, and estimating channel information by adopting an LS method;
(3) substituting the estimated channel information and the mirror image thereof into the received frequency domain data of the pilot frequency data block, and estimating IQ imbalance parameters by using the pilot frequency data block;
(4) taking a mirror image of the frequency domain data, merging the mirror image, substituting IQ imbalance parameters and channel information, compensating the frequency domain data, and estimating the frequency domain data of a sending signal on a frequency domain through LS;
(5) IFFT converting the estimated value obtained from the frequency domain to a time domain, and recovering the original sending data after demodulation;
the receiving end expresses frequency domain data Y (k, n) obtained after FFT of the received signal as:
Figure FDA0002627041990000011
where k denotes the kth data block, n denotes the nth data symbol of the frequency domain data block, Yj(k, n) is a value after FFT conversion of a received signal of a j-th antenna at a receiving end; si(k, n) are the values of the transmission signal of the ith antenna of the transmitting terminal after FFT; superscript # denotes mirror; w (k, n), U (k, n) are terms related to channel information and IQ imbalance parameters, and take values as:
Figure FDA0002627041990000012
wherein, αj＝(1+jexp(jθj))/2，βj＝(1-jexp(-jθj))/2，θjAndjis the phase and amplitude imbalance parameter at the jth receiving antenna; hji(k, n) is the channel frequency domain fading coefficient of the jth receiving antenna to the ith transmitting antenna;
Figure FDA0002627041990000013
is the noise interference term, V, of the jth antenna at the receiving endj(k, n) is the value of the receiver after the FFT of the additive white Gaussian noise of the j antenna;
the channel information estimation method in the step (2) comprises the following steps:
mirroring the frequency domain data Y (k, n), and mirroring Y (k, n) and Y#(k, n) superposition using IQ imbalance parameter relationships
Figure FDA0002627041990000014
Obtaining values not related to IQ imbalance
Figure FDA0002627041990000015
Figure FDA0002627041990000021
Stacking the nth data symbol of the pilot frequency data block to obtain:
Figure FDA0002627041990000022
wherein K represents the number of pilot data blocks, and V is an interference term related to noise;
estimating H by adopting an LS method:
Figure FDA0002627041990000023
the IQ imbalance parameter estimation method in the step (3) comprises the following steps:
channel information
Figure FDA0002627041990000024
And mirror image thereof
Figure FDA0002627041990000025
Substituting the frequency domain data Y of the j antennaj(k,n)：
Figure FDA0002627041990000026
Stacking all data symbols of K pilot data blocks received by the jth antenna in sequence, and changing the data symbols into a column vector form:
Figure FDA0002627041990000027
wherein
Figure FDA0002627041990000028
Figure FDA0002627041990000029
Consists of noise and channel estimation error;
estimating parameters α using LS methodjAnd βj：
Figure FDA00026270419900000210
2. The IQ imbalance estimation and compensation method for a receiving end of an SC-FDE system according to claim 1, wherein the frequency domain data compensation method in step (4) is as follows:
taking its mirror image Y for Y (k, n)#(k, n) are combined to give:
Figure FDA0002627041990000031
Wa(k,n)、Ua(k, n) is a term related to channel information and IQ imbalance, and takes values as:
Figure FDA0002627041990000032
obtaining S by LS methodaEstimated value of (a):
Figure FDA0002627041990000033
3. an apparatus for implementing the receiving IQ imbalance estimation and compensation method for SC-FDE system according to any one of claims 1-2, comprising:
the FFT conversion module is used for FFT converting the time domain data after the cyclic prefix is removed to a frequency domain;
the channel information estimation module is used for superposing the frequency domain data of the pilot frequency data block and the mirror image, obtaining superposed data irrelevant to IQ imbalance by utilizing the relation between IQ imbalance parameters, and estimating channel information by adopting an LS method;
an IQ imbalance estimation module for substituting the obtained channel estimation and its mirror image into the received frequency domain data, and estimating IQ imbalance parameters by using the pilot frequency data block;
the IQ imbalance compensation module is used for merging the mirror images of the frequency domain received data, substituting IQ imbalance parameters and channel information, compensating the frequency domain data, and estimating the frequency domain data of the transmitted signals on the frequency domain through LS;
an IFFT conversion module used for IFFT converting the frequency domain data obtained by the IQ imbalance compensation module to a time domain;
and the demapping module is used for demodulating the IQ imbalance compensated time domain data to obtain original sending data.
CN201810449170.6A 2018-05-11 2018-05-11 Method and device for estimating and compensating IQ imbalance of receiving end of SC-FDE system Active CN108616469B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810449170.6A CN108616469B (en) 2018-05-11 2018-05-11 Method and device for estimating and compensating IQ imbalance of receiving end of SC-FDE system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810449170.6A CN108616469B (en) 2018-05-11 2018-05-11 Method and device for estimating and compensating IQ imbalance of receiving end of SC-FDE system

Publications (2)

Publication Number Publication Date
CN108616469A CN108616469A (en) 2018-10-02
CN108616469B true CN108616469B (en) 2020-10-02

Family

ID=63663062

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810449170.6A Active CN108616469B (en) 2018-05-11 2018-05-11 Method and device for estimating and compensating IQ imbalance of receiving end of SC-FDE system

Country Status (1)

Country Link
CN (1) CN108616469B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110380996B (en) * 2019-07-12 2021-06-08 电子科技大学 Frequency-dependent IQ imbalance compensation method in SC-FDE system
CN110278167B (en) * 2019-07-31 2021-08-31 中国电子科技集团公司第五十四研究所 Wireless communication method for continuous estimation and compensation of IQ imbalance
CN111416783B (en) * 2020-03-31 2021-10-26 华南理工大学 Circulation-based IQ imbalance adaptive blind compensation method and system
CN115412207B (en) * 2022-08-29 2024-02-23 上海金卓科技有限公司 Encoding method and device and decoding method and device for space-time-frequency block code

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101499991A (en) * 2009-03-17 2009-08-05 广东工业大学 MIMO-OFDM system carrier frequency bias and sampling offset combined estimation method under IQ unbalance
CN103036846A (en) * 2012-12-27 2013-04-10 上海创远仪器技术股份有限公司 I or Q imbalance compensation control method applied to communication system receiver
CN103312640A (en) * 2013-06-30 2013-09-18 电子科技大学 Channel estimation and IQ (In-phase Quadrature) imbalance united compensation method
CN104639490A (en) * 2015-01-27 2015-05-20 电子科技大学 Joint estimation and compensation method for frequency-dependent IQ (In-phase Quadrature) mismatch and channel
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
CN107579938A (en) * 2017-07-26 2018-01-12 佛山市顺德区中山大学研究院 A kind of channel equalization method of joint IQ compensation
CN107819720A (en) * 2016-09-12 2018-03-20 深圳市中兴微电子技术有限公司 IQ imbalance compensations method and apparatus, time domain compensator and communication equipment
CN105791182B (en) * 2016-03-10 2018-10-23 东南大学 IQ imbalances and channel joint estimation method suitable for MIMO-OFDM systems

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101499991A (en) * 2009-03-17 2009-08-05 广东工业大学 MIMO-OFDM system carrier frequency bias and sampling offset combined estimation method under IQ unbalance
CN103036846A (en) * 2012-12-27 2013-04-10 上海创远仪器技术股份有限公司 I or Q imbalance compensation control method applied to communication system receiver
CN103312640A (en) * 2013-06-30 2013-09-18 电子科技大学 Channel estimation and IQ (In-phase Quadrature) imbalance united compensation method
CN104639490A (en) * 2015-01-27 2015-05-20 电子科技大学 Joint estimation and compensation method for frequency-dependent IQ (In-phase Quadrature) mismatch and channel
CN105791182B (en) * 2016-03-10 2018-10-23 东南大学 IQ imbalances and channel joint estimation method suitable for MIMO-OFDM systems
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
CN107819720A (en) * 2016-09-12 2018-03-20 深圳市中兴微电子技术有限公司 IQ imbalance compensations method and apparatus, time domain compensator and communication equipment
CN107579938A (en) * 2017-07-26 2018-01-12 佛山市顺德区中山大学研究院 A kind of channel equalization method of joint IQ compensation

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
60GHz通信系统中一种IQ不平衡补偿算法;陈兴海;《光通信研究》;20150228;全文 *
Joint Estimation and Compensation of Transmitter and Receiver IQ Imbalance in Millimeter-Wave SC-FDE Systems;Xiantao Cheng;《IEEE》;20150630;全文 *
全双工终端的收发I/Q不平衡估计与补偿算法;吴皓威;《通信学报》;20170131;全文 *

Also Published As

Publication number Publication date
CN108616469A (en) 2018-10-02

Similar Documents

Publication Publication Date Title
CN108616469B (en) Method and device for estimating and compensating IQ imbalance of receiving end of SC-FDE system
CN100553186C (en) OFDM channel estimating and multiple transmit antennas are followed the tracks of
US7643567B2 (en) OFDM signal transmitting method and transmitter and receiver thereof
US8422465B2 (en) Transmitter and receiver for high throughput wireless communication system using multiple antenna, method thereof, and digital intermediate frequency transmission signal processing method for the same
CN103312640B (en) A kind of method of joint channel estimation and IQ imbalance compensation
Lang et al. Design and development of a 5.25 GHz software defined wireless OFDM communication platform
US20070058734A1 (en) Circuit for improving channel impulse response estimation and compensating for remnant frequency offset in the orthogonal frequency division multiplexing baseband receiver for IEEE 802.11a/g wireless LAN standard standard
US20130235922A1 (en) Receiving apparatus and method for receiving signals in a wireless communication system with improved equalization performance
US8139544B1 (en) Pilot tone processing systems and methods
US10411913B2 (en) Efficient channel estimation and symbol detection for massive MIMO-OFDM
CN102045285A (en) Channel estimation method and device and communication system
Cheng et al. Joint estimation for I/Q imbalance and multipath channel in millimeter-wave SC-FDE systems
CN101340406A (en) Channel estimation method for MIMO OFDM system
CN105471774A (en) Phase noise estimation method, phase noise estimation device, receiver and communication equipment
Khansefid et al. Pilot designs and compensation scheme for severe RF distortions in millimeter-wave massive MIMO systems
KR20090065410A (en) Transmitter and receiver for high throughput wireless communication system with multiple antenna, test for the transmitter and receiver
Masmoudi et al. A digital subspace-based self-interference cancellation in full-duplex MIMO transceivers
Luo et al. Preamble based joint CFO, frequency-selective I/Q-imbalance and channel estimation and compensation in MIMO OFDM systems
EP2244432A1 (en) Compensating carrier frequency offsets in OFDM systems
CN113411281B (en) F-OFDM wireless transmission method based on parallel interference elimination
US20100272169A1 (en) Compensating carrier frequency offsets in ofdm systems
Manasseh et al. Efficient training design for estimation of channel, CFO, and receiver I/Q imbalance in MIMO-OFDM systems
Kiayani et al. Hybrid time/frequency domain compensator for RF impairments in OFDM systems
Ma et al. An adaptive approach to estimation and compensation of frequency-dependent I/Q imbalances in MIMO-OFDM systems
Le Compensation of Physical Impairments in Multi-Carrier Communications

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant