CN107579938A - A kind of channel equalization method of joint IQ compensation - Google Patents

A kind of channel equalization method of joint IQ compensation Download PDF

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CN107579938A
CN107579938A CN201710620618.1A CN201710620618A CN107579938A CN 107579938 A CN107579938 A CN 107579938A CN 201710620618 A CN201710620618 A CN 201710620618A CN 107579938 A CN107579938 A CN 107579938A
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CN107579938B (en
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李宇
李培炜
路崇
谭洪舟
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Sun Yat Sen University
SYSU CMU Shunde International Joint Research Institute
Research Institute of Zhongshan University Shunde District Foshan
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Sun Yat Sen University
SYSU CMU Shunde International Joint Research Institute
Research Institute of Zhongshan University Shunde District Foshan
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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 parameters, is then based on the channel parameter of estimation, IQ imbalances parameter carries out IQ compensation and channel equalization by Digital Signal Processing.Method provided by the invention can realize IQ compensation and the channel equalization of data.

Description

A kind of channel equalization method of joint IQ compensation
Technical field
It is equal more particularly, to a kind of channel of joint IQ compensation the present invention relates to single-carrier wave frequency domain equalization technology field Weighing apparatus method.
Background technology
In wireless communication technology, a small size is designed, price is low, and mobile terminal low in energy consumption is always that focus 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, directly by radiofrequency signal frequency conversion is baseband signal in receiving terminal.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, for the amplitude gain of two paths of signals nor identical, the two reasons will cause IQ uneven.Go out from hardware Hair, high performance analog device natural energy is selected to solve IQ imbalance problems, but its high cost, large volume to go out from hardware It is not optimal scheme that hair, which solves the unbalanced problems of IQ,.Therefore from the means of Digital Signal Processing to IQ imbalance problems It is current optimal selection to be suppressed and compensated.
In SC-FDE systems, signal transmits in wireless channel, can be acted on by the multipath fading of wireless channel.Therefore Need to carry out equilibrium to signal in receiving terminal to reduce the distortion of signal.
The present invention is exactly to be directed to two problems set forth above, and the unbalanced problems of IQ and signal equalization problem simultaneous are risen Come, solve the problems, such as two above simultaneously by way of Digital Signal Processing.
The content of the invention
The present invention gets up IQ imbalance problems existing for prior art and signal equalization problem simultaneous, passes through data signal The mode of processing solves the problems, such as two above simultaneously.
To realize above goal of the invention, the technical scheme of use is：
A kind of channel equalization method of joint IQ compensation, comprises the following steps：
S1. the form of the data block of the input signal of reception is adjusted in transmitting terminal, makes data blockMeet formula：
In one data block, except the 1st andPosition is arranged to outside 1, and other positions of data block are on the Position is symmetrical；
S2. data block is sent to reception by wireless channel after transmitting terminal is carried out to data block plus cyclic prefix operates End；
S3. after receiving terminal receives data-signal, the estimation of channel is carried out by the UW sequences isolated in data-signal, Obtain the time domain estimate h of channel parameterlsWith the estimate k of IQ imbalance parametersls1、kls2、kls3、kls4；
S4. by the time domain estimate h of channel parameterlsZero padding and DFT are carried out, obtains the frequency domain estimate G of channells、G1ls；
S5. by the IQ imbalance parameters k of acquisitionls1、kls2、kls3、kls4With Gls、G1lsMultiplying is carried out, obtains signal G1 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 () represents to take real part to operate, and imag () represents to take imaginary part to operate；
S7. receiving terminal receives data-signal rm=[r1,r2,...,rN]TAfterwards, data-signal rm=[r1,r2,...,rN]T DFT conversions are carried out after first carrying out serioparallel exchange, are 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 computingrAnd Xi：
S9. by two paths of signals XrAnd XiMerge into signal X, XrAs signal X signal real part, XiSignal as signal X Imaginary part；X is the frequency-region signal by IQ compensation and channel equalization；
S10. IDFT processing is carried out to signal X and obtains the time-domain signal s by IQ compensation and channel equalizationm。
Compared with prior art, the beneficial effects of the invention are as follows：
Method provided by the invention is then based on the letter of estimation by estimating channel parameter, IQ imbalance parameters Road parameter, IQ imbalances parameter carry out IQ compensation and channel equalization by Digital Signal Processing.Method provided by the invention can Realize IQ compensation and the channel equalization of data.
Brief description of the drawings
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 the bit error rate comparison diagram of method of the equalization methods of the present invention with only carrying out channel equalization.
Fig. 5 is that 16QAM sets the system IQ compensating equalizations under 1 and the planisphere after ZF equilibriums.
Fig. 6 is the bit error rate of method of the equalization methods of the present invention with only carrying out channel equalization under different IQ imbalance parameters Comparison diagram.
Fig. 7 is that 16QAM sets the system IQ compensating equalizations under 2 and the planisphere after ZF equilibriums.
Embodiment
Accompanying drawing being given for example only property explanation, it is impossible to be interpreted as the limitation to this patent；
Below in conjunction with drawings and examples, the present invention is further elaborated.
Embodiment 1
As shown in figure 1, the data block of the input signal for the method that the present invention relates to is handled firstly the need of in receiving terminal Into the reverse UW sequences of 1--data sequence -1- reverse datas sequence, the form of UW sequences.Wherein, data sequence is expressed asReverse data sequence is expressed asNdataFor data sequence Length.Similarly, UW sequences are expressed as [P1 P2 P3...PL-1 PL]T, and reversely UW sequences are expressed as [PL PL-1 PL-2...P2 P1]T, L is the length of UW sequences.
On the basis of more than, as shown in Figure 2,3, method provided by the invention specifically includes following steps：
S1. data block is sent to reception by wireless channel after transmitting terminal is carried out to data block plus cyclic prefix operates End；
S2. after receiving terminal receives data-signal, the estimation of channel is carried out by the UW sequences isolated in data-signal, Obtain the time domain estimate h of channel parameterlsWith the estimate k of IQ imbalance parametersls1、kls2、kls3、kls4；
S3. by the time domain estimate h of channel parameterlsZero padding and DFT are carried out, obtains the frequency domain estimate G of channells、G1ls；
Wherein, frequency domain estimate G is obtainedlsDetailed process it is as follows：
S4. by the IQ imbalance parameters k of acquisitionls1、kls2、kls3、kls4With Gls、G1lsMultiplying is carried out, obtains signal G1 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 () represents to take real part to operate, and imag () represents to take imaginary part to operate；
S6. receiving terminal receives data-signal rm=[r1,r2,...,rN]TAfterwards, data-signal rm=[r1,r2,...,rN]T DFT conversions are carried out after first carrying out serioparallel exchange, are converted to frequency-region signal R：
Wherein N 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 computingrAnd Xi：
S8. by two paths of signals XrAnd XiMerge into signal X, XrAs signal X signal real part, XiSignal as signal X Imaginary part；X is the frequency-region signal by IQ compensation and channel equalization：X=Xr+j×Xi；
S9. IDFT processing is carried out to signal X and obtains the time-domain signal s by IQ compensation and channel equalizationm：
N is the length of data sequence.
Embodiment 2
The present embodiment has carried out specific emulation experiment, the following institute of arrange parameter of emulation experiment to the method for embodiment 1 Show：
As shown in FIG. 4,5,6, 7, Fig. 4 is method of the equalization methods of the present invention with only carrying out channel equalization to the result of experiment Bit error rate comparison diagram.Fig. 5 is that 16QAM sets the system IQ compensating equalizations under 1 and the planisphere after ZF equilibriums.Fig. 6 is difference IQ imbalance parameters under equalization methods of the present invention with only carry out channel equalization method a bit error rate comparison diagram.Fig. 7 is 16QAM System IQ compensating equalizations under 2 and the planisphere after ZF equilibriums are set.
By above experimental result picture can be explained method provided by the invention have under different IQ imbalance parameters compared with Good compensation effect, and its compensation effect will get well than existing compensation method, can preferably improve the performance of system.
Obviously, the above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not pair The restriction of embodiments of the present invention.For those of ordinary skill in the field, may be used also on the basis of the above description To make other changes in different forms.There is no necessity and possibility to exhaust all the enbodiments.It is all this All any modification, equivalent and improvement made within the spirit and principle of invention etc., should be included in the claims in the present invention Protection domain within.

Claims (5)

  1. A kind of 1. channel equalization method of joint IQ compensation, it is characterised in that：Comprise the following steps：
    S1. the form of the data block of the input signal of reception is adjusted in transmitting terminal, makes data block Meet formula：
    <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>s</mi> <mn>2</mn> </msub> <mo>=</mo> <msub> <mi>s</mi> <mi>N</mi> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>s</mi> <mn>3</mn> </msub> <mo>=</mo> <msub> <mi>s</mi> <mrow> <mi>N</mi> <mo>-</mo> <mn>1</mn> </mrow> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mn>...</mn> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>s</mi> <mrow> <mfrac> <mi>N</mi> <mn>2</mn> </mfrac> <mo>-</mo> <mn>1</mn> </mrow> </msub> <mo>=</mo> <msub> <mi>s</mi> <mrow> <mfrac> <mi>N</mi> <mn>2</mn> </mfrac> <mo>+</mo> <mn>3</mn> </mrow> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>s</mi> <mfrac> <mi>N</mi> <mn>2</mn> </mfrac> </msub> <mo>=</mo> <msub> <mi>s</mi> <mrow> <mfrac> <mi>N</mi> <mn>2</mn> </mfrac> <mo>+</mo> <mn>2</mn> </mrow> </msub> </mrow> </mtd> </mtr> </mtable> </mfenced>
    In one data block, except the 1st andPosition is arranged to outside 1, and other positions of data block are on thePosition is right Claim；
    S2. data block is sent to receiving terminal by wireless channel after transmitting terminal is carried out to data block plus cyclic prefix operates；
    S3. after receiving terminal receives data-signal, the estimation of channel is carried out by the UW sequences isolated in data-signal, is obtained The time domain estimate h of channel parameterlsWith the estimate k of IQ imbalance parametersls1、kls2、kls3、kls4；
    S4. by the time domain estimate h of channel parameterlsZero padding and DFT are carried out, obtains the frequency domain estimate G of channells、G1ls；
    S5. by the IQ imbalance parameters k of acquisitionls1、kls2、kls3、kls4With Gls、G1lsMultiplying is carried out, obtains signal G1And 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：
    <mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>g</mi> <mn>1</mn> </msub> <mo>=</mo> <mi>r</mi> <mi>e</mi> <mi>a</mi> <mi>l</mi> <mrow> <mo>(</mo> <msub> <mi>G</mi> <mn>1</mn> </msub> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>g</mi> <mn>2</mn> </msub> <mo>=</mo> <mi>i</mi> <mi>m</mi> <mi>a</mi> <mi>g</mi> <mrow> <mo>(</mo> <msub> <mi>G</mi> <mn>1</mn> </msub> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>g</mi> <mn>3</mn> </msub> <mo>=</mo> <mi>r</mi> <mi>e</mi> <mi>a</mi> <mi>l</mi> <mrow> <mo>(</mo> <msub> <mi>G</mi> <mn>2</mn> </msub> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>g</mi> <mn>4</mn> </msub> <mo>=</mo> <mi>i</mi> <mi>m</mi> <mi>a</mi> <mi>g</mi> <mrow> <mo>(</mo> <msub> <mi>G</mi> <mn>2</mn> </msub> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>;</mo> </mrow>
    Wherein, real () represents to take real part to operate, and imag () represents to take imaginary part to operate；
    S7. receiving terminal receives data-signal rm=[r1,r2,...,rN]TAfterwards, data-signal rm=[r1,r2,...,rN]TIt is advanced DFT conversions are carried out after row serioparallel exchange, are 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 computingrAnd Xi：
    <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>X</mi> <mi>r</mi> </msub> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>=</mo> <mo>&amp;lsqb;</mo> <msub> <mi>R</mi> <mi>i</mi> </msub> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <msub> <mi>g</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>-</mo> <msub> <mi>R</mi> <mi>r</mi> </msub> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <msub> <mi>g</mi> <mn>4</mn> </msub> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>&amp;rsqb;</mo> <mo>/</mo> <mo>&amp;lsqb;</mo> <msub> <mi>g</mi> <mn>3</mn> </msub> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <msub> <mi>g</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>-</mo> <msub> <mi>g</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <msub> <mi>g</mi> <mn>4</mn> </msub> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>&amp;rsqb;</mo> <mo>,</mo> <mi>k</mi> <mo>=</mo> <mn>1</mn> <mo>,</mo> <mn>2</mn> <mo>,</mo> <mn>...</mn> <mo>,</mo> <mi>N</mi> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>X</mi> <mi>i</mi> </msub> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>=</mo> <mo>&amp;lsqb;</mo> <msub> <mi>R</mi> <mi>i</mi> </msub> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <msub> <mi>g</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>-</mo> <msub> <mi>R</mi> <mi>r</mi> </msub> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <msub> <mi>g</mi> <mn>3</mn> </msub> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>&amp;rsqb;</mo> <mo>/</mo> <mo>&amp;lsqb;</mo> <msub> <mi>g</mi> <mn>4</mn> </msub> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <msub> <mi>g</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>-</mo> <msub> <mi>g</mi> <mn>3</mn> </msub> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <msub> <mi>g</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>&amp;rsqb;</mo> <mo>,</mo> <mi>k</mi> <mo>=</mo> <mn>1</mn> <mo>,</mo> <mn>2</mn> <mo>,</mo> <mn>...</mn> <mo>,</mo> <mi>N</mi> </mrow> </mtd> </mtr> </mtable> </mfenced>
    S9. by two paths of signals XrAnd XiMerge into signal X, XrAs signal X signal real part, XiSignal imaginary part as signal X； X is the frequency-region signal by IQ compensation and channel equalization；
    S10. IDFT processing is carried out to signal X and obtains the time-domain signal s by IQ compensation and channel equalizationm。
  2. 2. the channel equalization method of joint IQ compensation according to claim 1, it is characterised in that：The step S4 obtains frequency Domain estimate GlsDetailed process it is as follows：
    <mrow> <mi>d</mi> <mi>i</mi> <mi>a</mi> <mi>g</mi> <mrow> <mo>(</mo> <msub> <mi>G</mi> <mrow> <mi>l</mi> <mi>s</mi> </mrow> </msub> <mo>)</mo> </mrow> <mo>=</mo> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>n</mi> <mo>=</mo> <mn>0</mn> </mrow> <mrow> <mi>L</mi> <mo>-</mo> <mn>1</mn> </mrow> </munderover> <msub> <mi>h</mi> <mrow> <mi>l</mi> <mi>s</mi> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msup> <mi>e</mi> <mrow> <mo>-</mo> <mi>j</mi> <mfrac> <mrow> <mn>2</mn> <mi>&amp;pi;</mi> <mi>k</mi> <mi>n</mi> </mrow> <mi>N</mi> </mfrac> </mrow> </msup> </mrow>
    Wherein L be multipath channel path number, hls(n) it is to live through the time domain estimate of zero padding and DFT channel parameter, N For the length of data sequence.
  3. 3. the channel equalization method of joint IQ compensation according to claim 1, it is characterised in that：The step S7 is carried out The detailed process that DFT is converted to frequency-region signal R is as follows：
    <mrow> <mi>R</mi> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>=</mo> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>n</mi> <mo>=</mo> <mn>0</mn> </mrow> <mrow> <mi>N</mi> <mo>-</mo> <mn>1</mn> </mrow> </munderover> <mi>r</mi> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msup> <mi>e</mi> <mrow> <mo>-</mo> <mi>j</mi> <mfrac> <mrow> <mn>2</mn> <mi>&amp;pi;</mi> <mi>k</mi> <mi>n</mi> </mrow> <mi>N</mi> </mfrac> </mrow> </msup> </mrow>
    Wherein N is the length of data sequence.
  4. 4. the channel equalization method of joint IQ compensation according to claim 1, it is characterised in that：Signal X is expressed as：X=Xr +j×Xi。
  5. 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 it is as follows：
    <mrow> <msub> <mi>s</mi> <mi>m</mi> </msub> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>=</mo> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>n</mi> <mo>=</mo> <mn>0</mn> </mrow> <mrow> <mi>N</mi> <mo>-</mo> <mn>1</mn> </mrow> </munderover> <mi>X</mi> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msup> <mi>e</mi> <mrow> <mi>j</mi> <mfrac> <mrow> <mn>2</mn> <mi>&amp;pi;</mi> <mi>k</mi> <mi>n</mi> </mrow> <mi>N</mi> </mfrac> </mrow> </msup> </mrow>
    N 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
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