CN101309100B - I/Q phase and gain compensating apparatus and method of orthogonal receiver - Google Patents
I/Q phase and gain compensating apparatus and method of orthogonal receiver Download PDFInfo
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Abstract
The invention relates to an I/Q phase and gain imbalance compensation device of a quadrature receiver and the method thereof. The device and the method use the statistic information of the received signal as the basis of the I/Q imbalance compensation. A symbol result from the product of the I channel signal and the Q channel signal is generated, and the symbol is used to compensate the phase imbalance between I channel signal and Q channel signal; a symbol result from the absolute value difference between the I channel signal and the Q channel signal is also generated, and the symbol is usedto compensate the gain imbalance between I channel signal and Q channel signal. Thereby, the method avoids the problem that using the fixed loop gain to control the phase imbalance error and the gainerror imbalance error can result in strong influence on the adjusting step by the received signal intensity, and using the variable loop gain can result in more resources demand in the signal level estimating.
Description
Technical field
The present invention relates to quadrature receiver, more particularly, relate to the apparatus and method that I/Q phase place and gain imbalance compensated at quadrature receiver.
Background technology
Quadrature receiver uses quadrature frequency conversion and the vector detection scheme on two branch roads.In this case, the error of the I channel of simulation and the phase shift of Q interchannel (specified 90 degree) and the mismatch of gain can cause the unbalance of phase place between I channel signal and the Q channel signal and gain, and it is unbalance to be herein referred to as I/Q.When I/Q occurring when unbalance, between in-phase channel and orthogonal channel, just occurred crosstalking.
If special training symbol is not used in unbalance detection for I/Q, utilizing the statistical property that receives signal to compensate is the basic scheme that solves the I/Q unbalance in the quadrature receiver.The article of FredHarris " Digital Filter Equalization of Analog Gain and PhaseMismatch in I-Q receiver " (Universal Personal communications, 1996.Record., 1,996 5
ThIEEE International Conference on, page793-796Vol.2), introduced a kind of method, the method utilizes phase place and gain balance ring to come phase place and gain mismatch are compensated.According to this article, U.S. Patent application No.10/839383 discloses a kind of like this method, and the variable loop that the method utilization becomes with the mean value of the error signal between I channel signal and the Q channel signal gains and comes compensation of phase and gain mismatch.
Fig. 1 and Fig. 2 show the method for Fred Harris.
As shown in Figure 1, multiply each other by first multiplier 101 pairs of in-phase channel signals I and orthogonal channel signal Q, obtained the phase imbalance error amount of current sampling instant.The second multiplier 102 is with this phase imbalance error amount and retainer ring gain μ
1Multiply each other, obtain the phase imbalance value, by the integrator output phase imbalance values that is consisted of by adder 103 and delayer 104, and by the phase compensating circuit that is consisted of by multiplier 105 and adder 106 this phase imbalance value is compensated.
As shown in Figure 2, generated the absolute value of in-phase channel signal I by absolute value maker 201, by the absolute value of absolute value maker 202 generating orthogonal channel signal Q, at adder 203 places two absolute values are subtracted each other, obtain the gain imbalance error amount of current sampling instant.Multiplier 204 is with this gain imbalance error amount and retainer ring gain μ
2Multiply each other, obtain the gain imbalance value.By the integrator output gain imbalance values that is made of adder 205 and delayer 206, and the gain compensation circuit that consists of by multiplier 207 compensates this gain imbalance value.
In the method, use respectively retainer ring gain μ
1And μ
2Come the unbalance error amount of control phase and gain imbalance error amount.Therefore, according to the method, the intensity that receives signal affects regulating step consumingly, thereby particularly under wireless environment, can't make regulating step keep constant.
If with the same in U.S. Patent application No.10/839383, use the variable loop gain, then signal level need to estimate more resource.
Summary of the invention
The present invention has been proposed in view of the above problems.The present invention is devoted to provide the apparatus and method that I/Q phase place and gain imbalance are compensated in a kind of quadrature receiver, and it has overcome one or more problem that causes owing to the limitation of prior art and shortcoming basically.
According to a first aspect of the invention, a kind of phase imbalance compensation arrangement is provided, it is used at quadrature receiver the phase imbalance between I channel signal and the Q channel signal being compensated, this phase imbalance compensation arrangement comprises phase imbalance detector and phase compensator, described phase imbalance detector detects received I channel signal and the phase error between the Q channel signal, thereby output phase imbalance values, and the phase imbalance value of described phase compensator by exporting in response to the phase imbalance detector, in described I channel signal and the described Q channel signal any one is as reference signal, revise in described I channel signal and the described Q channel signal another, thereby compensate described phase error, wherein, described phase imbalance detector comprises: symbol creation device, and it is for the symbol of the product that generates described I channel signal and described Q channel signal; Phase imbalance error generating apparatus, it utilizes predefined phase imbalance error base and described symbol to generate the phase imbalance error; And the phase imbalance value generation device, it utilizes the phase imbalance value of described phase imbalance error and last signal sampling to generate the phase imbalance value of current demand signal sampling.
According to a second aspect of the invention, a kind of phase imbalance compensation method is provided, it is used at quadrature receiver the phase imbalance between I channel signal and the Q channel signal being compensated, and described phase imbalance compensation method may further comprise the steps: the symbol that (a) generates the product of described I channel signal and described Q channel signal; (b) utilize predefined phase imbalance error base and described symbol to generate the phase imbalance error; (c) utilize the phase imbalance value of described phase imbalance error and last signal sampling to generate the phase imbalance value that current demand signal is sampled; And (d) based on described phase imbalance value, any one in described I channel signal and the described Q channel signal be as reference signal, revises in described I channel signal and the described Q channel signal another, thereby compensate described phase error.
According to a third aspect of the invention we, a kind of gain imbalance compensation arrangement is provided, it is used at quadrature receiver the gain imbalance between I channel signal and the Q channel signal being compensated, this gain imbalance compensation arrangement comprises gain imbalance detector and gain compensator, described gain imbalance detector detects received I channel signal and the gain error between the Q channel signal, thereby output gain imbalance values, and described gain compensator is based on described gain imbalance value, revise any in described I channel signal and the described Q channel signal, thereby compensate described gain error, wherein, described gain imbalance detector comprises: symbol creation device, and it is for the symbol of the difference of the absolute value of the absolute value that generates described I channel signal and described Q channel signal; Gain imbalance error generating apparatus, it utilizes predefined gain imbalance error base and described symbol to generate the gain imbalance error; And the gain imbalance value generation device, it utilizes the gain imbalance value of described gain imbalance error and last signal sampling to generate the gain imbalance value of current demand signal sampling.
According to a forth aspect of the invention, a kind of gain imbalance compensation method is provided, it is used at quadrature receiver the gain imbalance between I channel signal and the Q channel signal being compensated, wherein, described gain imbalance compensation method may further comprise the steps: (a) symbol of the difference of the absolute value of the absolute value of the described I channel signal of generation and described Q channel signal; (b) utilize predefined gain imbalance error base and described symbol to generate the gain imbalance error; (c) utilize the gain imbalance value of described gain imbalance error and last signal sampling to generate the gain imbalance value that current demand signal is sampled; And (d) based on described gain imbalance value, revise any in described I channel signal and the described Q channel signal, thereby compensate described gain error.
According to a fifth aspect of the invention, a kind of phase place and gain imbalance compensation arrangement are provided, it comprises according to the phase imbalance compensation arrangement of first aspect present invention with according to the gain imbalance compensation arrangement of third aspect present invention, described phase imbalance compensation arrangement carries out phase compensation to I channel signal and the Q channel signal that receives, generate thus through the I of phase compensation channel signal and Q channel signal, and input to described gain imbalance compensation arrangement with described through the I of phase compensation channel signal and Q channel signal, described gain imbalance compensation arrangement carries out gain compensation to the signal of inputting, thereby generates through the I of phase place and gain compensation channel signal and Q channel signal.
According to a sixth aspect of the invention, a kind of phase place and gain imbalance compensation method are provided, it is used at quadrature receiver phase place and gain imbalance between I channel signal and the Q channel signal being compensated, and this phase place and gain imbalance compensation method may further comprise the steps: the symbol that (a) generates the product of described I channel signal and described Q channel signal; (b) utilize the symbol of predefined phase imbalance error base and described product to generate the phase imbalance error; (c) utilize the phase imbalance value of described phase imbalance error and last signal sampling to generate the phase imbalance value that current demand signal is sampled; (d) based on described phase imbalance value, in described I channel signal and the described Q channel signal any one is as reference signal, revise in described I channel signal and the described Q channel signal another, thereby compensate described phase error, the symbol of the difference of the I channel signal of (e) generation process phase compensation and the absolute value of Q channel signal; (f) utilize the symbol of the difference of predefined gain imbalance error base and described absolute value to generate the gain imbalance error; (g) utilize the gain imbalance value of described gain imbalance error and last signal sampling to generate the gain imbalance value that current demand signal is sampled; And (h) based on described gain imbalance value, revise any in described I channel signal and the described Q channel signal, thereby compensate described gain error.
Compared with prior art, above-mentioned phase place of the present invention and gain imbalance compensation arrangement and method have the following advantages:
(1) in each phase place and gain error estimation, the absolute value of phase place or gain imbalance error is fixed, and therefore, is not subjected to the impact of the amplitude of I channel signal and Q channel signal;
(2) compensation speed of phase imbalance and precision only are subjected to the impact of phase imbalance error base;
(3) compensation speed of gain imbalance and precision only are subjected to the impact of gain imbalance error base;
(4) hardware is realized very simple.
Description of drawings
Accompanying drawing shows the preferred embodiments of the present invention, has consisted of the part of specification, is used for explaining in further detail principle of the present invention with explanatory note.Wherein:
Fig. 1 is the figure that illustrates according to the phase imbalance compensation arrangement of prior art;
Fig. 2 is the figure that illustrates according to the gain imbalance compensation arrangement of prior art;
Fig. 3 be illustrate in ofdm system, use according to the preferred embodiment of the invention for detection of and compensate the figure of the quadrature demodulator of phase place between I channel signal and the Q channel signal and gain imbalance;
Fig. 4 be another illustrate in ofdm system, use according to the preferred embodiment of the invention for detection of and compensate the figure of the quadrature demodulator of phase place between I channel signal and the Q channel signal and gain imbalance;
Fig. 5 A is the planisphere without the I channel signal in the ofdm system in phase place and the gain imbalance situation and Q channel signal, Fig. 5 B has phase imbalance and without the planisphere of the I channel signal in the ofdm system in the gain imbalance situation and Q channel signal, Fig. 5 C is I channel signal in the ofdm system that has without phase imbalance in the gain imbalance situation and the planisphere of Q channel signal, and Fig. 5 D is existing phase imbalance I channel signal in the ofdm system in the gain imbalance situation and the planisphere of Q channel signal is arranged;
Fig. 6 illustrates the according to the preferred embodiment of the invention figure of phase imbalance compensation arrangement; And
Fig. 7 illustrates the according to the preferred embodiment of the invention figure of gain imbalance compensation arrangement.
Embodiment
Below, with reference to accompanying drawing, to a preferred embodiment of the present invention will be described in detail.
Fig. 3 be illustrate in ofdm system, use according to the preferred embodiment of the invention for detection of and compensate the figure of the quadrature demodulator of phase place between I channel signal and the Q channel signal and gain imbalance.Wherein, with the I channel signal as reference signal.
As shown in Figure 3, quadrature demodulator 300 comprises simulation part 330, digital time domain section 340 and digital frequency domain section 350.
Simulation part 330 comprises signal splitter 301, the first multiplier 302, the second multiplier 303, local carrier generator 304,90 ° of phase shifters 305, the first analog to digital converter (ADC) 306 and second analog to digital converters 307.
Digital time domain section 340 comprises phase imbalance detector 308, phase compensator 309, gain imbalance detector 310, gain compensator 311 and deserializer 312.
The I channel signal that gain imbalance detector 310 receives after phase compensation
With the Q channel signal
Detect the gain imbalance value between them, and the output gain imbalance values.Gain compensator 311 compensates the Q channel signal in response to the gain imbalance value from 310 outputs of gain imbalance detector
Gain, generate the signal through gain compensation
Will
Be rewritten as
Like this,
With
Just become I channel signal and Q channel signal behind gain compensation.
Numeral frequency domain section 350 comprises fast fourier transform (FFT) module 313 and Base-Band Processing section 314.These are known technology contents of this area, and not critical to the present invention, therefore no longer they are described in detail at this.
Need to prove, although do not illustrate among Fig. 3, for the purpose of correctly receiving operation, may also need other assembly, such as filter etc.Those skilled in the art can make to this suitable layout fully, therefore, repeat no more their concrete layout, so that main points of the present invention are more outstanding.
As mentioned above, phase place and gain imbalance produce in simulation part 330.
Fig. 4 shows according to another embodiment of the present invention quadrature demodulator 400.Different with embodiment among Fig. 3 is, in Fig. 4, the Q channel signal as reference signal, and is carried out phase place and gain imbalance compensation to the I channel signal.Adopt with Fig. 3 in similar label come modules corresponding in the sign picture 4 and the quadrature demodulator shown in Figure 3.Simulation part 430 and frequency domain section 450 respectively with Fig. 3 in simulation part 330 and frequency domain section 350 identical, no longer be described here.The below is briefly described digital time domain section 440.
Digital time domain section 440 comprises phase imbalance detector 408, phase compensator 409, gain imbalance detector 410, gain compensator 411 and deserializer 412.
The I channel signal that gain imbalance detector 410 receives after phase compensation
With the Q channel signal
Detect the gain imbalance value between them, and the output gain imbalance values.Gain compensator 411 compensates the I channel signal in response to the gain imbalance value from 410 outputs of gain imbalance detector
Gain, generate the signal through gain compensation
Will
Be rewritten as
Like this,
With
Just become I channel signal and Q channel signal behind gain compensation.
In the OFDM radio communications system, the amplitude of signal is rayleigh distributed, and angle is evenly distributed.If there is not I/Q unbalance, then the planisphere of signal is the circle shown in Fig. 5 A.If have phase imbalance or gain imbalance between I channel signal and the Q channel signal, perhaps not only there is phase imbalance but also have gain imbalance, the planisphere of signal no longer is round.Fig. 5 B has phase imbalance and without the planisphere of the I channel signal in the ofdm system in the gain imbalance situation and Q channel signal, Fig. 5 C is I channel signal in the ofdm system that has without phase imbalance in the gain imbalance situation and the planisphere of Q channel signal, and Fig. 5 D is existing phase imbalance I channel signal in the ofdm system in the gain imbalance situation and the planisphere of Q channel signal is arranged.
The present invention is based on above-mentioned planisphere distributes.
Fig. 6 shows in detail phase imbalance detector 308 among Fig. 3 and the concrete structure of phase compensator 309.Phase imbalance detector 308 and phase compensator 309 have consisted of the phase imbalance compensation arrangement jointly.
The below describes the operation of phase imbalance detector 308.
The product of the first multiplier 601 output I channel signals and Q channel signal.Symbol maker 602 generates the symbol S (k) of the product of I channel signal and Q channel signal.Can utilize two kinds of methods to generate described symbol:
(1) works as μ
10 o'clock, for
S (k)=1; Otherwise S (k)=-1; Perhaps
(2) work as μ
1＜0 o'clock, for
S (k)=1; Otherwise S (k)=-1.
Aforesaid operations can by at first getting the symbol of I channel signal and Q channel signal, then multiply each other to realize that with these two symbols this is so that multiplier can be simpler.Phase imbalance error e (k)=S (k) * μ
1Generated by multiplier 603.μ
1It is predefined phase imbalance error base.Here, μ
1Can be the usually nonzero value more much smaller than the mean amplitude of tide of signal of absolute value.
The phase imbalance value that Postponement module 605 storages detect
And with this phase imbalance value that detects
Be deferred to next signal sampling.
The below is described the operation of phase compensator 309.
At multiplier 606 places, with the phase imbalance value of the last signal sampling that detects
With the I channel signal
Multiply each other.Then, by at adder 607 places from the Q channel signal
Middle elimination I channel signal
Obtain the channel signal through the Q of phase compensation
Fig. 7 shows in detail gain imbalance detector 310 among Fig. 3 and the concrete structure of gain compensator 311.Gain imbalance detector 310 and gain compensator 311 have consisted of the gain imbalance compensation arrangement jointly.
The below describes the operation of gain imbalance detector 310.
704 outputs of symbol maker
With
The symbol s (k) of difference.Can utilize two kinds of methods to generate described symbol:
(1) works as μ
20 o'clock, for
S (k)=1; Otherwise S (k)=-1; Perhaps
(2) work as μ
2＜0 o'clock, for
S (k)=1; Otherwise S (k)=-1.
μ
2It is predefined gain imbalance error base.Here, μ 2 can be the usually nonzero value more much smaller than the mean amplitude of tide of signal of absolute value.
The gain imbalance value that Postponement module 707 storages detect
And with this gain imbalance value
Postpone to be used for next signal sampling.
The below describes the operation of gain compensator 311.
At multiplier 708 places, with the gain imbalance value of the last signal sampling that detects
With through the Q of phase compensation channel signal
Multiply each other, to form through the Q of phase place and gain compensation channel signal
In the embodiment of Fig. 6 and Fig. 7, take the I channel signal as reference signal the Q channel signal is carried out phase place and gain compensation.Yet, as previously mentioned, can be take the Q channel signal as reference signal, and the I channel signal is carried out phase place and gain compensation.Here no longer be described in detail.
In addition, based on above embodiment, those skilled in the art are easy to envision take the I channel signal as reference signal the Q channel signal are carried out phase compensation, and the I channel signal are carried out the embodiment of gain compensation take the Q channel signal as reference signal.In concrete application, according to actual conditions, also can only compensate one of people in phase place and the gain.Here no longer these modified examples are elaborated.
According to the abovementioned embodiments of the present invention, can prevent the performance degradation that the I channel signal that causes because of defective quadrature demodulator and the phase place between the Q channel signal and/or gain imbalance cause.
Need to prove that scope of the present invention also comprises be used to the computer program of carrying out above-mentioned phase place and gain compensating method and the computer readable recording medium storing program for performing that records this program.As recording medium, can use computer-readable floppy disk, hard disk, semiconductor memory, CD-ROM, DVD, magneto optical disk (MO) and other medium here.
Although below only selected preferred embodiment to come illustration the present invention, those skilled in the art are easy to carry out variations and modifications according to content disclosed herein in the situation that does not break away from the invention scope that is defined by the following claims.The explanation of above-described embodiment only is exemplary, and does not consist of the restriction to the invention that is limited by claims and equivalent thereof.
Claims (22)
1. phase imbalance compensation arrangement, it is used at quadrature receiver the phase imbalance between I channel signal and the Q channel signal being compensated, this phase imbalance compensation arrangement comprises phase imbalance detector and phase compensator, described phase imbalance detector detects received I channel signal and the phase error between the Q channel signal, thereby output phase imbalance values, and the phase imbalance value of described phase compensator by exporting in response to the phase imbalance detector, in described I channel signal and the described Q channel signal any one is as reference signal, revise in described I channel signal and the described Q channel signal another, thereby compensate described phase error
Wherein, described phase imbalance detector comprises:
Symbol creation device, it is used for the symbol of the product of generation current I channel signal and current Q channel signal;
Phase imbalance error generating apparatus, it utilizes predefined phase imbalance error base and described symbol to generate the phase imbalance error; And
The phase imbalance value generation device, it generates phase imbalance value between the sampling of current I channel signal and the sampling of current Q channel signal with the phase imbalance value addition between the sampling of described phase imbalance error and last I channel signal and the sampling of last Q channel signal,
Wherein, described symbol creation device generates described symbol in the following manner:
When described phase imbalance error base greater than 0 the time, if the product of described current I channel signal and described current Q channel signal is not less than 0, then getting described symbol is 1, otherwise, if the product of described current I channel signal and described current Q channel signal is less than 0, then getting described symbol is-1;
When described phase imbalance error base less than 0 the time, if it is 1 that the product of described current I channel signal and described current Q channel signal less than 0, is then got described symbol, otherwise, if the product of described current I channel signal and described current Q channel signal is not less than 0, then getting described symbol is-1.
2. phase imbalance compensation arrangement according to claim 1, wherein, described phase imbalance error base is that absolute value is much smaller than the nonzero value of signal averaging amplitude.
3. phase imbalance compensation arrangement according to claim 1, wherein, described phase imbalance error generating apparatus is by multiplying each other to generate described phase imbalance error with described phase imbalance error base and described symbol.
4. phase imbalance compensation arrangement according to claim 1, wherein, described phase imbalance value generation device comprises a deferred mount, the current I channel signal sampling that the storage of this deferred mount detects and the phase imbalance value between the sampling of current Q channel signal, and will current I channel signal sampling and the sampling of current Q channel signal between the phase imbalance value postpone to sample to be used for next I channel signal sampling and next Q channel signal.
5. phase imbalance compensation arrangement according to claim 4, wherein, described phase compensator by in last I channel signal sampling that described phase imbalance detector is detected and the phase imbalance value between the sampling of last Q channel signal and described current I channel signal and the described current Q channel signal as a signal multiplication of reference signal, another signal from described current I channel signal and described current Q channel signal deducts the result who multiplies each other again, comes described another signal is carried out phase compensation.
6. phase imbalance compensation method, it is used at quadrature receiver the phase imbalance between I channel signal and the Q channel signal being compensated,
Described phase imbalance compensation method may further comprise the steps:
(a) symbol of the product of generation current I channel signal and current Q channel signal;
(b) utilize predefined phase imbalance error base and described symbol to generate the phase imbalance error;
(c) with the phase imbalance value addition generation current I channel signal sampling between described phase imbalance error and the sampling of last I channel signal and the sampling of last Q channel signal and the phase imbalance value between the sampling of current Q channel signal; And
(d) based on the described phase imbalance value between described current I channel signal sampling and the sampling of current Q channel signal, in described current I channel signal and the described current Q channel signal any one is as reference signal, revise in described current I channel signal and the described current Q channel signal another, thereby compensate described phase imbalance value
Wherein, in step (a), generate in the following manner described symbol:
When described phase imbalance error base greater than 0 the time, if the product of described current I channel signal and described current Q channel signal is not less than 0, then getting described symbol is 1, otherwise, if the product of described current I channel signal and described current Q channel signal is less than 0, then getting described symbol is-1;
When described phase imbalance error base less than 0 the time, if it is 1 that the product of described current I channel signal and described current Q channel signal less than 0, is then got described symbol, otherwise, if the product of described current I channel signal and described current Q channel signal is not less than 0, then getting described symbol is-1.
7. phase imbalance compensation method according to claim 6, wherein, described phase imbalance error base is that absolute value is much smaller than the nonzero value of signal averaging amplitude.
8. phase imbalance compensation method according to claim 6, wherein, in step (b), by described phase imbalance error base and described symbol are multiplied each other to generate described phase imbalance error.
9. phase imbalance compensation method according to claim 6, wherein, store the phase imbalance value between the current I channel signal that detects is sampled and current Q channel signal is sampled, and the phase imbalance value between the sampling of current I channel signal and the sampling of current Q channel signal is postponed to sample for next I channel signal and next Q channel signal sampling.
10. phase imbalance compensation method according to claim 9, wherein, in step (d), by with in delayed phase imbalance value and described current I channel signal and the described current Q channel signal as a signal multiplication of reference signal, another signal from described current I channel signal and described current Q channel signal deducts the result who multiplies each other again, comes described another signal is carried out phase compensation.
11. gain imbalance compensation arrangement, it is for compensating the gain imbalance between I channel signal and Q channel signal at quadrature receiver, this gain imbalance compensation arrangement comprises gain imbalance detector and gain compensator, described gain imbalance detector detects received I channel signal and the gain error between the Q channel signal, thereby output gain imbalance values, and described gain compensator is based on described gain imbalance value, revise any in described I channel signal and described Q channel signal, thereby compensate described gain error
Wherein, described gain imbalance detector comprises:
Symbol creation device, it is for the symbol of the difference of the absolute value of the absolute value that generates the current I channel signal and current Q channel signal;
Gain imbalance error generating apparatus, it utilizes predefined gain imbalance error base and described symbol to generate the gain imbalance error; And
The gain imbalance value generation device, it utilizes gain imbalance value between the sampling of described gain imbalance error and last I channel signal and the sampling of last Q channel signal to generate gain imbalance value between the sampling of current I channel signal and the sampling of current Q channel signal,
Wherein, described symbol creation device generates described symbol in the following manner:
When described gain imbalance error base greater than 0 the time, if the difference of the absolute value of the absolute value of described current I channel signal and described current Q channel signal is not less than 0, then getting described symbol is 1, otherwise, if it is-1 that the difference of the absolute value of the absolute value of described current I channel signal and described current Q channel signal, is then got described symbol less than 0;
When described gain imbalance error base less than 0 the time, if the difference of the absolute value of the absolute value of described current I channel signal and described current Q channel signal is less than 0, then getting described symbol is 1, otherwise, if the difference of the absolute value of the absolute value of described current I channel signal and described current Q channel signal is not less than 0, then getting described symbol is-1.
12. gain imbalance compensation arrangement according to claim 11, wherein, described gain imbalance error base is that absolute value is much smaller than the nonzero value of signal averaging amplitude.
13. gain imbalance compensation arrangement according to claim 11, wherein, described gain imbalance error generating apparatus is by multiplying each other to generate described gain imbalance error with described gain imbalance error base and described symbol.
14. gain imbalance compensation arrangement according to claim 11, wherein, described gain imbalance value generation device comprises a deferred mount, the current I channel signal sampling that the storage of this deferred mount detects and the gain imbalance value between the sampling of current Q channel signal, and will current I channel signal sampling and the sampling of current Q channel signal between the gain imbalance value postpone to sample to be used for next I channel signal sampling and next Q channel signal.
15. gain imbalance compensation arrangement according to claim 14, wherein, described gain compensator last I channel signal sampling and the gain imbalance value between the sampling of last Q channel signal and any signal multiplication in described current I channel signal and the described current Q channel signal by described gain imbalance detector is detected carries out gain compensation to this signal.
16. a gain imbalance compensation method, it is used at quadrature receiver the gain imbalance between I channel signal and the Q channel signal being compensated,
Wherein, described gain imbalance compensation method may further comprise the steps:
(a) symbol of the difference of the absolute value of the absolute value of generation current I channel signal and current Q channel signal;
(b) utilize predefined gain imbalance error base and described symbol to generate the gain imbalance error;
(c) with the gain imbalance value addition generation current I channel signal sampling between described gain imbalance error and the sampling of last I channel signal and the sampling of last Q channel signal and the gain imbalance value between the sampling of current Q channel signal; And
(d) based on the gain imbalance value between described current I channel signal and the current Q channel signal, revise any in described I channel signal sampling and the sampling of described Q channel signal, thereby compensate described gain imbalance value,
Wherein, in step (a), generate in the following manner described symbol:
When described gain imbalance error base greater than 0 the time, if the difference of the absolute value of the absolute value of described current I channel signal and described current Q channel signal is not less than 0, then getting described symbol is 1, otherwise, if it is-1 that the difference of the absolute value of the absolute value of described current I channel signal and described current Q channel signal, is then got described symbol less than 0;
When described gain imbalance error base less than 0 the time, if the difference of the absolute value of the absolute value of described current I channel signal and described current Q channel signal is less than 0, then getting described symbol is 1, otherwise, if the difference of the absolute value of the absolute value of described current I channel signal and described current Q channel signal is not less than 0, then getting described symbol is-1.
17. gain imbalance compensation method according to claim 16, wherein, described gain imbalance error base is that absolute value is much smaller than the nonzero value of signal averaging amplitude.
18. gain imbalance compensation method according to claim 16, wherein, in step (b), by described gain imbalance error base and described symbol are multiplied each other to generate described gain imbalance error.
19. gain imbalance compensation method according to claim 16, wherein, in step (c), gain imbalance value between the current I channel signal sampling that storage detects and the sampling of current Q channel signal, and will current I channel signal sampling and the sampling of current Q channel signal between the gain imbalance value postpone to sample to be used for next I channel signal sampling and next Q channel signal.
20. gain imbalance compensation method according to claim 19, wherein, in step (d), by with any signal multiplication in delayed gain imbalance value and described current I channel signal and the described current Q channel signal, this signal is carried out gain compensation.
21. a phase place and gain imbalance compensation arrangement, it comprises phase imbalance compensation arrangement as claimed in claim 1 and gain imbalance compensation arrangement as claimed in claim 11, described phase imbalance compensation arrangement carries out the phase imbalance compensation to I channel signal and the Q channel signal that receives, generate thus I channel signal and Q channel signal through the phase imbalance compensation, and input to described gain imbalance compensation arrangement with described through the I of phase compensation channel signal and Q channel signal, described gain imbalance compensation arrangement carries out the gain imbalance compensation to the signal of inputting, thereby generates I channel signal and Q channel signal through phase place and gain imbalance compensation.
22. a phase place and gain imbalance compensation method, it is used at quadrature receiver phase place and gain imbalance between I channel signal and the Q channel signal being compensated,
This phase place and gain imbalance compensation method may further comprise the steps:
(a) symbol of the product of generation current I channel signal and current Q channel signal;
(b) utilize the symbol of predefined phase imbalance error base and described product to generate the phase imbalance error;
(c) with the phase imbalance value addition generation current I channel signal sampling between described phase imbalance error and the sampling of last I channel signal and the sampling of last Q channel signal and the phase imbalance value between the sampling of current Q channel signal;
(d) based on the phase imbalance value between described current I channel signal and the current Q channel signal, in described current I channel signal and the described current Q channel signal any one is as reference signal, revise in described current I channel signal and the described current Q channel signal another, thereby compensate described phase error;
(e) symbol of the difference of the absolute value of the current I channel signal of generation process phase compensation and current Q channel signal;
(f) utilize the symbol of the difference of predefined gain imbalance error base and described absolute value to generate the gain imbalance error;
(g) utilize gain imbalance value between the sampling of described gain imbalance error and last I channel signal and the last Q channel signal sampling to generate gain imbalance value between the sampling of current I channel signal and the sampling of current Q channel signal; And
(h) based on the gain imbalance value between described current I channel signal and the current Q channel signal, revise any in described current I channel signal and the described current Q channel signal, thereby compensate described gain error,
Wherein, in step (a), generate in the following manner described symbol:
When described phase imbalance error base greater than 0 the time, if the product of described current I channel signal and described current Q channel signal is not less than 0, then getting described symbol is 1, otherwise, if the product of described current I channel signal and described current Q channel signal is less than 0, then getting described symbol is-1;
When described phase imbalance error base less than 0 the time, be 1 if the product of described current I channel signal and described current Q channel signal less than 0, is then got described symbol, otherwise, if the product of described current I channel signal and described current Q channel signal is not less than 0, then getting described symbol is-1
Wherein, in step (e), generate in the following manner described symbol:
When described gain imbalance error base greater than 0 the time, if the difference of the absolute value of the absolute value of described current I channel signal and described current Q channel signal is not less than 0, then getting described symbol is 1, otherwise, if it is-1 that the difference of the absolute value of the absolute value of described current I channel signal and described current Q channel signal, is then got described symbol less than 0;
When described gain imbalance error base less than 0 the time, if the difference of the absolute value of the absolute value of described current I channel signal and described current Q channel signal is less than 0, then getting described symbol is 1, otherwise, if the difference of the absolute value of the absolute value of described current I channel signal and described current Q channel signal is not less than 0, then getting described symbol is-1.
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| CN101562591B (en) * | 2009-05-12 | 2013-07-31 | 复旦大学 | I/Q mismatch estimating and compensating method of training sequence based on phase rotation |
| CN101989862B (en) * | 2009-08-05 | 2014-08-06 | 立积电子股份有限公司 | Receiver and method for receiving wireless signal |
| WO2012124586A1 (en) * | 2011-03-14 | 2012-09-20 | 古河電気工業株式会社 | Quadrature demodulator |
| CN102868650B (en) * | 2012-09-13 | 2015-02-11 | 江苏物联网研究发展中心 | Orthogonal I/O (Input/Output) signal phase unbalance correcting circuit |
| CN104811215B (en) * | 2015-04-14 | 2017-10-10 | 华南理工大学 | A kind of IQ imbalance compensations apparatus and method |
| CN113922894B (en) * | 2021-10-19 | 2023-02-10 | 浙江大学 | Multi-channel phase calibration method, system, medium and terminal of quadrature modulation digital receiver |
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| CN1663214A (en) * | 2002-06-18 | 2005-08-31 | 诺基亚公司 | Amplitude imbalance compensation of quadrature modulator |
| WO2006030481A1 (en) * | 2004-09-13 | 2006-03-23 | Mitsubishi Denki Kabushiki Kaisha | Distortion compensating apparatus |
| CN1780280A (en) * | 2004-11-24 | 2006-05-31 | 朗迅科技公司 | Inphase/quadrature phase imbalance compensation |
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| CN1663214A (en) * | 2002-06-18 | 2005-08-31 | 诺基亚公司 | Amplitude imbalance compensation of quadrature modulator |
| WO2006030481A1 (en) * | 2004-09-13 | 2006-03-23 | Mitsubishi Denki Kabushiki Kaisha | Distortion compensating apparatus |
| CN1780280A (en) * | 2004-11-24 | 2006-05-31 | 朗迅科技公司 | Inphase/quadrature phase imbalance compensation |
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