CN106878229A - IQ based on initial phase compensation is uneven to be estimated and compensation method and device - Google Patents
IQ based on initial phase compensation is uneven to be estimated and compensation method and device Download PDFInfo
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- CN106878229A CN106878229A CN201710018194.1A CN201710018194A CN106878229A CN 106878229 A CN106878229 A CN 106878229A CN 201710018194 A CN201710018194 A CN 201710018194A CN 106878229 A CN106878229 A CN 106878229A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
- H04L27/362—Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated
- H04L27/364—Arrangements for overcoming imperfections in the modulator, e.g. quadrature error or unbalanced I and Q levels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
- H04L27/3845—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier
- H04L27/3854—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier using a non - coherent carrier, including systems with baseband correction for phase or frequency offset
- H04L27/3872—Compensation for phase rotation in the demodulated signal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate
Abstract
The present invention provides a kind of IQ imbalances based on initial phase compensation and estimates and compensation method and device, and the IQ is uneven to be estimated to be comprised the following steps with compensation method：Step S1, the docking collection of letters number synchronizes detection and obtains frame start position；Step S2, the initial phase of signal is received according to the frequency domain phase and the frequency domain phase estimation of local signal that receive signal, and the then docking collection of letters number carries out initial phase compensation；Step S3, the uneven estimations of IQ is carried out to the reception signal after compensation initial phase and is compensated.Present invention selection length instruction sequence carries out initial phase and estimates and the uneven estimations of IQ, realize the uneven estimations of IQ and compensation method based on initial phase compensation, it is capable of the influence of the effective initial phase offset that cancellation receiver local oscillator time error and signal transmission time bring, improve the uneven degrees of accuracy estimated of IQ, after IQ amount of unbalances are compensated, the performance for receiving signal is finally improved.
Description
Technical field
It is uneven the present invention relates to a kind of IQ imbalance methods of estimation, more particularly to a kind of IQ based on initial phase compensation
Estimate and compensation method, and be related to employ the device of the IQ imbalances estimation and compensation method for being based on initial phase compensation.
Background technology
The WLAN of IEEE802.11 standards uses Direct Conversion transmitter/receiver.Direct Conversion transmitter/receiver without
Intermediate frequency, directly by signal from base-band frequency conversion to radio frequency/radio frequency is converted to base band.Preferable Direct Conversion transmitter/receiver is in frequency conversion
When I roads and Q roads signal there is the property of complete orthogonal same amplitude.But in fact, due to device, Direct Conversion transmitting/
Receiver is difficult to reach perfect condition, can produce I, Q road amplitude, the deviation of phase, so as to cause demodulation performance to deteriorate, i.e., so-called
IQ imbalance problems.Direct Conversion transmitter/receiver is applied, it must just be compensated, eliminate IQ uneven
The influence weighed to system.
The content of the invention
The technical problems to be solved by the invention are to need to provide a kind of uneven estimations of the IQ based on initial phase compensation
And compensation method, and then reach and accurately estimate IQ unbalanced errors and compensated accordingly, to improve the demodulation of receiving terminal
The purpose of performance, and need to provide the device for employing the IQ imbalances estimation and compensation method for being based on initial phase compensation.
In this regard, the present invention is provided, a kind of IQ based on initial phase compensation is uneven to be estimated and compensation method, including following
Step：
Step S1, the docking collection of letters number synchronizes detection and obtains frame start position；
Step S2, the initial phase of signal is received according to the frequency domain phase and the frequency domain phase estimation of local signal that receive signal
Position, the then docking collection of letters number carries out initial phase compensation；
Step S3, the uneven estimations of IQ is carried out to the reception signal after compensation initial phase and is compensated.
Further improvement of the present invention is that the step S2 includes following sub-step：
Step S201, after the docking collection of letters number completes synchronous detection, navigates to the length instruction sequence for receiving signal, then with reception
The frequency domain phase of the frequency domain phase instruction sequence long with local signal of Chief Signal Boatswain instruction sequence carries out phase difference value computing by subcarrier, most
The average value of these phase difference values is asked for afterwards as the initial phase for receiving signal；
Step S202, after estimating the initial phase for receiving signal, at the beginning of the frequency domain compensation of the instruction sequence long of the docking collection of letters number
Beginning phase.
Further improvement of the present invention is that the step S3 includes following sub-step：
Step S301, the frequency domain characteristic of the reception signal after being compensated using initial phase carries out the uneven estimations of IQ；
Step S302, after the uneven estimations of IQ, the docking collection of letters number is compensated.
Further improvement of the present invention is, in the step S201, by formula Ask for the initial phase of the reception signalWherein, NLTSThe frequency domain points of Fourier transformation are represented, k is carried for son
Wave train number, ΨX(k)_LTSLocal signal instruction sequence long frequency domain phase on sub-carrierk is represented,Represent and receive signal
Instruction sequence long frequency domain phase on sub-carrierk.
Further improvement of the present invention is, in the step S202, estimates the initial phase for receiving signalAfterwards, lead to
Cross formulaRealize being docked on frequency domain and receive Chief Signal Boatswain instruction sequenceCompensation is just
Beginning phase, i is imaginary unit.
Further improvement of the present invention is, in the step S301, after initial phase is compensatedFrequency
Domain characteristic, first passes through equationEstimate IQ not
Balance associated expression μrAnd vr, wherein, k1 and k2 is subcarrier, and k2 ≠ k1, N are the sum of subcarrier in frequency domain, and X (k) is this
The value of the subcarrier in frequency domain k of ground instruction sequence long, X*K () is the conjugation of X (k),To receive instruction sequence subcarrier in frequency domain long
Value after k compensation initial phases,ForConjugation, k ∈ { k1, k2, N-k1, N-k2 }.
Further improvement of the present invention is, in the step S301, according to IQ imbalance associated expressions μrAnd vrEstimate
IQ amplitude imbalances αrWith IQ unbalance in phase θr, formula is Wherein, η=- μr/vr *, Gain=(- b ± sqrt (b2- 4))/2,vr *For vrConjugation, real (η) is the real part of η, and imag (η) is the imaginary part of η, and arctan is
Negate tangent, η and b is the uneven intermediate computations amount estimated.
Further improvement of the present invention is, in the step S302, by formulaIt is right
Receive signalIQ imbalance compensations are carried out, wherein, μr' and vr' it is respectively IQ amplitude imbalances αrWith unbalance in phase θrBy answering that formula is constituted
Number.
Further improvement of the present invention is, in the step S1, using receiving, signal short training sequence is short with local signal
Instruction sequence enters line slip related operation, the starting point for receiving signal short training sequence is obtained by similarity degree, and then derive and connect
The original position of signal frame is received, this process is thick synchronizing process；According to the frame start position that thick synchronizing process is obtained, acquisition connects
The position that Chief Signal Boatswain instructs sequence is received, then local signal instruction sequence long enters line slip related operation with Chief Signal Boatswain instruction sequence is received,
Obtain the starting point of the instruction sequence long for receiving signal by similarity degree, so revise signal frame original position, this process
It is smart synchronizing process.
The present invention also provides a kind of uneven estimations of the IQ based on initial phase compensation and compensation device, employs as above institute
The IQ imbalance methods of estimation of the initial phase compensation stated, and including：
Synchronization module, by receiving the short training sequence of signal and local signal and the signal autocorrelation of instruction sequence long, inspection
The frame header position for receiving signal is measured, it is then determined that receiving the position of each data field in signal；
Initial phase is estimated and compensating module, using instruction sequence frequency domain characteristic long, instructs sequence and connect by the way that local signal is long
The frequency domain phase difference that Chief Signal Boatswain instructs sequence is received, initial phase is estimated, then by this initial phase compensation to reception Chief Signal Boatswain
In instruction sequence；
IQ is uneven to be estimated and compensating module, using the frequency domain characteristic for compensating the instruction sequence long after initial phase, estimates to connect
The IQ amplitude imbalances and IQ unbalance in phase of the collection of letters number, and IQ imbalance compensations are carried out to the whole signal that receives；
Channel estimation and parsing module, to completing the reception signal after IQ imbalance compensations, channel are done using instruction sequence long
Estimate, balancing operational and parsing are carried out to receiving data field.
Compared with prior art, the beneficial effects of the present invention are：Selection instruction sequence long carries out initial phase estimation and IQ
Imbalance estimation, realizes the estimation and compensation method for receiving signal initial phase, the instruction sequence long after compensation initial phase, frequently
Each subcarrier is subject to the uneven influences of identical IQ on domain.Using its frequency domain IQ unbalance responses, realize that IQ is uneven and estimate,
After the uneven estimations of IQ are estimated, the docking collection of letters number carries out IQ imbalance compensations.After present invention compensation initial phase, effectively eliminate
The influence of the initial phase offset that receiver local oscillator time error and signal transmission time bring so that IQ is uneven to be estimated and mend
Repay very accurate, the demodulation performance of receiving terminal can be effectively improved.
Brief description of the drawings
Fig. 1 is the workflow schematic diagram of an embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings, preferably embodiment of the invention is described in further detail.
First, first term is explained, WLAN is Wireless Local Area Network line LANs, OFDM
It is Orthogonal Frequency Division Multiplexing OFDMs, STS is short training
Symbol Short training sequences, abbreviation short training sequence symbol；LTS is accorded with for long training symbol long training sequences
Number, instruction sequence symbol referred to as long.
This example considers preferable WLAN models, it is assumed that baseband complex signal is x (t)=xI(t)+i*xQ(t), Direct Conversion hair
Machine I, Q roads local oscillation signal is penetrated for aI(t)=cos (wct),aQ(t)=sin (wcT), wherein t is time, wcFor the load that radio frequency is used
The angular frequency of frequent rate.
Then transmitting radiofrequency signal is
Wherein x*T () is the conjugation of x (t),
Channel response from transmitting terminal to receiving terminal is designated as h (t), and interchannel noise is Gaussian noise n (t), then
The radiofrequency signal that Direct Conversion Receiver is received is represented by Wherein t is the time,Represent convolution algorithm.
Direct Conversion Receiver I roads and Q roads local oscillation signal are bI(t)=cos (wct),bQ(t)=- sin (wct).Assuming that
Direct Conversion Receiver is expressed as y (t)=y by what radiofrequency signal was transformed to complex baseband signalI(t)+i*yQ(t), then have Wherein, LPF was low pass filter, will be containedHFS is eliminated by wave filter.
Y can similarly be derivedQ(t)=i*LPF { bQ(t)rRF(t) }=i*xQ(t)。
In ideal communication channel h (t)=1 and in the case of ignoring noise, receiving terminal baseband signal and transmitting terminal baseband signal
Relation is as followsIllustrate that by local oscillator be a by the formulaI(t)=cos
(wct),aQ(t)=sin (wcT) emitter and local oscillator is bI(t)=cos (wct),bQ(t)=- sin (wcT) receiver,
The baseband signal for receiving can be regarded as the baseband signal of transmitting.
But in a practical situation, because the local oscillator of Direct Conversion Receiver is undesirable, I roads and Q roads can be caused after frequency conversion
Signal produces the imbalance of amplitude and phase, i.e. two-way amplitude to differ, phase difference is not 90.Then Direct Conversion Receiver I
Road and Q roads local oscillation signals bI(t)=cos (wct),bQ(t)=- sin (wcT) it is changed into bI(t)=(1+ αr)cos(wct-θr/ 2), bQ
(t)=- (1- αr)sin(wct+θr/ 2), wherein αrReceiver IQ amplitude imbalance amounts are represented,
Unit is dB.WithIt is respectively receiver I roads and Q roads amplitude gain.θrReceiver IQ unbalance in phase amounts are represented, is to receive
Deviation of the phase difference on machine I roads and Q roads with preferable 90 degree.
Now formulaIt is changed into Wherein μr、vrIt is by IQ amplitude imbalances αrWith IQ unbalance in phase θrThe correlated expression of composition
Formula.
At this time receive signalConjugate x comprising transmission signal*T (), i.e., disturbed by conjugate, cause to connect
Performance is received to be affected.Work as αr=0, θrWhen=0, there is μr=1, vr=0, this is precisely the reception mode on ideal I road and Q roads.
The unbalanced influences of IQ are considered from frequency domain, if xNIt is a time-domain representation of Symbol, DFT represents that Fourier becomes
Change, N is the points of Fourier transformation, XkIt is xNFrequency domain representation, i.e. Xk=DFT (xN), XconjIt is xNConjugation x* NFrequency domain table
Show, i.e.,Consider XkWithRelation, if
So
If receiver IQ amplitude imbalances are αr, IQ unbalance in phase is θr, combination IQ imbalance expression formulasConnecing after then being influenceed by IQ imbalances
Receiving model isIn a Symbol, it is considered to formulaFrequency domain, X=DFT (x (t)), So Y (k)=μrX
(k)+vrXconj(k)=μrX(k)+vrX*(N-k).I.e. from frequency domain, when there is IQ and be uneven, the reception of frequency domain carriers k
Introduce the interference of image carrier N-k.Likewise, there is Y (N-k)=μ on subcarrier N-krX(N-k)+vrX*(k)。
Simultaneous subcarrier k and N-k can obtain equationActually should
In, X (k) is obtained by local signal instruction sequence frequency domain representation long, and Y (k) is obtained by reception Chief Signal Boatswain instruction sequence frequency domain, but this
The characteristic of ground instruction sequence long, the matrix of composition is to degenerate, therefore this equation can not directly seek the unbalanced correlative μ of IQrWith
vr。
But, because IQ imbalances are identicals on frequency domain each subcarrier, then selection two subcarriers k1, k2, then
There is expressionNow can be rational by selection
K1, k2, construct invertible matrix such that it is able to try to achieve IQ imbalance intermediate quantities μrAnd vr。
Then, according to the IQ imbalance intermediate quantities μ for trying to achieverAnd vrIQ amplitude imbalances arWith IQ unbalance in phase θr, to IQ
Imbalance receives modelIQ imbalance compensations are carried out, compensating factor isThen compensate
After beAfter carrying out IQ imbalance compensationsEliminate conjugate
x*The interference of (t).
In the equipment of practical application, the above-mentioned two methods that are given estimate that IQ is uneven and the effect after compensating simultaneously
It is bad.Because transmitter and receiver is by local oscillator Time Inconsistency, adds signal transmission and be also required to a period of time, this is just
Result in formulaIt is not strict establishment.
Assuming that the initial time of transmitting x (t) transmission is t=τ0, the carrier frequency for using is f, receives signal y (t) and receives
Initial time to transmission signal is t=τ1, according to the transport property of electromagnetic wave, then y (t) and x (t) have an initial phase
Skew, sending and receiving end baseband signal relation is expressed as follows again：Y (t)=ei*Ψ* x (t), wherein It is to being rounded under x.Initial phase Ψ is carried out equivalent to the whole signal relative transmission signal that receives
The rotation of angle Ψ.
For normal receiving stream journey, initial phase Ψ can be balanced out by channel estimation and balanced two steps, because
This does not influence to receive, and is usually not considered.
Emitter, receiver local oscillator time difference and signal transmission need the time to cause the signal to have the rotation of phase Ψ,
Namely so-called initial phase, receiver IQ amplitude imbalances are αr, IQ unbalance in phase is θr, the uneven expression of combination IQ
FormulaIt is then uneven by initial phase Ψ and IQ
Weighing apparatus αr、θrReception model after influence isei*ΨRegard a constant as, by Symbol
Frequency domain is fourier transformed into, then frequency domain receives model and is expressed as again
So, under the influence of initial phase and IQ imbalances, the unbalanced formula of IQ are asked to be changed into Cannot be disappeared the influence of initial phase Ψ, and its result is certainly existed
Error.
In contrast to this, this example is first estimated to receive the initial phase of signal, then compensates for this initial phase, and compensation is just
Reception data after beginning phase meet formula Y (k)=μ on frequency domainrX(k)+vrX*(N-k), that can just use the above method
It is correct to estimate that IQ is uneven.After having estimated IQ imbalances, IQ imbalance compensations are done in the docking collection of letters number, eliminate the dry of conjugate
Disturb, reach the purpose of lifting receptivity.
As shown in figure 1, this example is provided, a kind of IQ based on initial phase compensation is uneven to be estimated and compensation method, including with
Lower step：
Step S1, the docking collection of letters number synchronizes detection and obtains frame start position；
Step S2, the initial phase of signal is received according to the frequency domain phase and the frequency domain phase estimation of local signal that receive signal
Position, the then docking collection of letters number carries out initial phase compensation；
Step S3, the uneven estimations of IQ is carried out to the reception signal after compensation initial phase and is compensated.
In step S1 described in this example, enter that line slip is related to transport using signal short training sequence and local signal short training sequence is received
Calculate, the starting point for receiving signal short training sequence is obtained by similarity degree, and then derive the original position for receiving signal frame, this
Individual process is thick synchronizing process；According to the frame start position that thick synchronizing process is obtained, instruction sequence long is obtained, then by local letter
Instruction sequence number long enters line slip related operation with Chief Signal Boatswain instruction sequence is received, and obtains the length that reception signal is obtained by similarity degree
Instruct the starting point of sequence, so revise signal frame original position, this process is smart synchronizing process.
Specifically, in step S1 described in this example, according to signal IQ two paths of data is received, by the coherent detection of certain window
Afterwards, frame start position is obtained.Thick synchronizing process of the invention is carried out using signal short training sequence is received with local signal short training sequence
Related operation is slided, its similarity degree is judged, concrete operations Shi Dui IQ roads difference crosscorrelation, and take square cumulative after correlation
Value.The formula for being used is as follows, Cτ=CI,I_ideal+CI,Q_ideal+CQ,I_ideal+CQ,Q_idealAnd PointSTS
=Max (Cτ), whereinRepresent and receive signal with the real part that time τ is starting,Represent that receive signal is with time τ
The imaginary part of starting, xIT () _ STS represents local signal short training sequence STS signal real parts, xQT () _ STS represents local signal short training
Sequence STS signal imaginary parts, ∑ () represents cumulative, and Max () represents maximizing, PointSTSRepresent and receive short training on signal
The original position of sequence STS.
The synchronization of short training sequence STS has 10 peak values, is obtained according to peak value and receives signal short training sequence STS starting points, so
After derive reception signal frame start position, realize thick synchronizing process.It is repositioned on and receives the position that Chief Signal Boatswain instructs sequence, uses
Instruction sequence long and local instruction sequence long are received, thick synchronizing process is repeated and is realized that essence is synchronous.After instruction sequence related operation long
Two peak values, also derive the starting point for receiving signal frame, and final frame start position is with the starting point that smart synchronizing process is obtained
It is accurate.
Certainly, the collection of letters number is docked described in this example to synchronize detection is that, in order to obtain frame start position, this example lists one
Preferred method is planted, in actual applications, it is not limited to a kind of this synchronization detecting method, as long as obtaining frame start position i.e.
Can.
Step S2 described in this example estimates initial phase according to the frequency domain phase of signal and the frequency domain phase of local signal is received
Position, preferably includes following sub-step：
Step S201, after the docking collection of letters number completes synchronous detection, navigates to the length instruction sequence for receiving signal, then carries out Fu
In leaf transformation to frequency domain, carried by son with the frequency domain phase for receiving the frequency domain phase instruction sequence long with local signal that Chief Signal Boatswain instructs sequence
Ripple carries out phase difference value computing, finally asks for the average value of these phase difference values as the initial phase for receiving signal；
Step S202, after estimating the initial phase for receiving signal, at the beginning of the frequency domain compensation of the instruction sequence long of the docking collection of letters number
Beginning phase.
In step S201 described in this example, by formulaDescribed reception is asked for believe
Number initial phaseWherein, NLTSThe frequency domain points of Fourier transformation are represented, k is subcarrier sequence number, ΨX(k)_LTSRepresent local
Frequency domain phase on Chief Signal Boatswain instruction sequence subcarrier k,Represent the frequency domain phase received on Chief Signal Boatswain instruction sequence subcarrier k
Position.
In step S202 described in this example, the initial phase for receiving signal is estimatedAfterwards, by formula Realize being docked on frequency domain and receive Chief Signal Boatswain instruction sequenceCompensation initial phase.
Step S3 described in this example is using the instruction sequence long after compensation initial phaseEstimated, using IQ not
The characteristic on frequency domain is balanced, the uneven estimations of IQ are carried out, following sub-step is preferably included：
Step S301, the frequency domain characteristic of the reception signal after being compensated using initial phase carries out the uneven estimations of IQ；
Step S302, after the uneven estimations of IQ, the docking collection of letters number is compensated.
802.11a/p/g/n/ac standards are modulated on frequency domain without all subcarriers are used, and effective t easet ofasubcarriers are with mould
Formula is different and different, and by taking 802.11a as an example, subcarrier in frequency domain sum is designated as N=64, and the frequency domain of instruction sequence long is for estimating IQ not
The sub-carrier positions of balance are K=1 ... 26, N-26 ..., N-1, wherein X and XconjDo not possess the subcarrier k=0 of conjugacy,
N/2 is will not to carry real data, therefore is neglected.In the subcarrier k=1 of carrying real data ... 26, N-26 ..., N-1
In, all possess propertyWherein, X (k) is local signal instruction sequence long in sub- load
Expression on ripple k,It is the expression on sub-carrierk of the Chief Signal Boatswain instruction sequence after compensation initial phase.Described in this example
In step S301, after initial phase is compensatedFrequency domain characteristic, first estimate IQ imbalances correlative μrAnd vr,
Also referred to as IQ imbalance associated expressions.Estimate that the IQ on subcarrier k1 is uneven, appoint and take a subcarrier k2 ≠ k1 and matrixWhen being full rank, IQ imbalance associated expressions are first sought, according to equationAsk for, wherein, N is the sum of subcarrier in frequency domain, and X (k1) is instruction sequence long
The value of the subcarrier in frequency domain k1 of row, X*(k1) it is the conjugation of X (k1)..To ensure stability, ask the IQ on multiple subcarriers uneven
Weighing apparatus intermediate expression μrAnd vr, then it is averaging processing.
Then, according to IQ imbalance associated expressions μrAnd vrEstimate IQ amplitude imbalances αrWith IQ unbalance in phase θr, it is public
Formula isWherein, η=- μr/vr *, Gain
=(- b ± sqrt (b2- 4))/2,vr *For vrConjugation, real (η) is the real part of η, imag
(η) is the imaginary part of η, and arctan is tangent of negating.
In step S302 described in this example, by formulaThe docking collection of letters numberCarry out IQ
Imbalance compensation, wherein,μr' and
vr' it is respectively IQ amplitude imbalances αrWith unbalance in phase θrBy the plural number that formula is constituted.
This example also provides a kind of uneven estimations of the IQ based on initial phase compensation and compensation device, employs as described above
Initial phase compensation IQ it is uneven estimate and compensation method, and including：
Synchronization module, by receiving the short training sequence of signal and local signal and the signal autocorrelation of instruction sequence long, inspection
The frame header position for receiving signal is measured, it is then determined that receiving the position of each data field in signal；
Initial phase is estimated and compensating module, using instruction sequence frequency domain characteristic long, instructs sequence and connect by the way that local signal is long
The frequency domain phase difference that Chief Signal Boatswain instructs sequence is received, initial phase is estimated, then by this initial phase compensation to reception Chief Signal Boatswain
In instruction sequence；
IQ is uneven to be estimated and compensating module, using the frequency domain characteristic for compensating the instruction sequence long after initial phase, estimates to connect
The IQ amplitude imbalances and IQ unbalance in phase of the collection of letters number, and IQ imbalance compensations are carried out to the whole signal that receives；
Channel estimation and parsing module, to completing the reception signal after IQ imbalance compensations, channel are done using instruction sequence long
Estimate, balancing operational and parsing are carried out to receiving data field.
Synchronization module described in this example is used to realize that the docking collection of letters number of step S1 to synchronize detection to obtain start of frame bits
Put, synchronization module mainly using short training sequence and the autocorrelation of instruction sequence long, detects the frame header position for receiving signal, then
It is determined that receiving the position of each data field in signal.
Initial phase described in this example is estimated and compensating module is used to realize that the initial phase of step S2 to be estimated and compensated.Initially
Phase estimation and compensating module mainly using instruction sequence frequency domain characteristic long, are instructed sequence and receive the frequency for instructing sequence long by local length
Domain phase difference, estimates initial phase, and then the compensation of this initial phase is instructed in sequence to Chief Signal Boatswain is received.
IQ described in this example is uneven to be estimated and compensating module method, the main instruction sequence long utilized after compensating initial phase
Frequency domain characteristic, using the uneven Fourier transform properties the same to data influence on each subcarrier and conjugate sequence of IQ,
By selecting rational subcarrier pair, construct non degenerate matrix and estimate IQ amplitude imbalances and IQ unbalance in phase, then will
The IQ amount of unbalances estimated are compensated onto reception signal.
Channel estimation described in this example and parsing module, for realizing after step S3 completes the uneven estimations of IQ and compensation,
Reception data after IQ imbalance compensations are sent into receiver module processor, routinely flow carries out channel estimation and parsing number
According to.
This example selection length instruction sequence carries out initial phase and estimates and the uneven estimations of IQ, realizes reception signal initial phase
Estimation and compensation method, the instruction sequence long after compensation initial phase, each subcarrier is subject to identical IQ uneven on frequency domain
Influence.Using its frequency domain IQ unbalance responses, the uneven estimations of IQ are realized, after the uneven estimations of IQ are estimated, the docking collection of letters number
Carry out IQ imbalance compensations.After present invention compensation initial phase, when effective cancellation receiver local oscillator time error and signal transmission
Between the influence of initial phase offset that brings so that IQ is uneven to be estimated and compensation is very accurate, can effectively improve receiving terminal
Demodulation performance.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to assert
Specific implementation of the invention is confined to these explanations.For general technical staff of the technical field of the invention,
On the premise of not departing from present inventive concept, some simple deduction or replace can also be made, should be all considered as belonging to of the invention
Protection domain.
Claims (10)
1. a kind of IQ based on initial phase compensation is uneven estimates and compensation method, it is characterised in that comprise the following steps：
Step S1, the docking collection of letters number synchronizes detection and obtains frame start position；
Step S2, the initial phase of signal is received according to the frequency domain phase and the frequency domain phase estimation of local signal that receive signal,
Then the docking collection of letters number carries out initial phase compensation；
Step S3, the uneven estimations of IQ is carried out to the reception signal after compensation initial phase and is compensated.
2. the IQ based on initial phase compensation according to claim 1 is uneven estimates and compensation method, it is characterised in that
The step S2 includes following sub-step：
Step S201, after the docking collection of letters number completes synchronous detection, navigates to the length instruction sequence for receiving signal, then with reception signal
The frequency domain phase of the frequency domain phase instruction sequence long with local signal of instruction sequence long carries out phase difference value computing by subcarrier, finally asks
The average value of these phase difference values is taken as the initial phase for receiving signal；
Step S202, after estimating the initial phase for receiving signal, the frequency domain compensation initial phase of the instruction sequence long of the docking collection of letters number
Position.
3. the IQ based on initial phase compensation according to claim 2 is uneven estimates and compensation method, it is characterised in that
The step S3 includes following sub-step：
Step S301, the frequency domain characteristic of the reception signal after being compensated using initial phase carries out the uneven estimations of IQ；
Step S302, after the uneven estimations of IQ, the docking collection of letters number carries out IQ imbalance compensations.
4. the IQ based on initial phase compensation according to claim 3 is uneven estimates and compensation method, it is characterised in that
In the step S201, by formulaAsk for the initial phase of the reception signal
PositionWherein, NLTSThe frequency domain points of Fourier transformation are represented, k is subcarrier sequence number, ΨX(k)_LTSRepresent local signal instruction sequence long
Row frequency domain phase on sub-carrierk,Represent and receive Chief Signal Boatswain instruction sequence frequency domain phase on sub-carrierk.
5. the IQ based on initial phase compensation according to claim 4 is uneven estimates and compensation method, it is characterised in that
In the step S202, the initial phase for receiving signal is estimatedAfterwards, by formula Realize being docked on frequency domain and receive Chief Signal Boatswain instruction sequenceCompensation initial phase.
6. the IQ based on initial phase compensation according to claim 5 is uneven estimates and compensation method, it is characterised in that
In the step S301, after initial phase is compensatedFrequency domain characteristic, first pass through equationEstimate IQ imbalance associated expressions μr
And vr, wherein, k1 and k2 is subcarrier, and k2 ≠ k1, N are the sum of subcarrier in frequency domain, and X (k) is the frequency of local instruction sequence long
The value of domain subcarrier k, X*K () is the conjugation of X (k),To receive instruction sequence subcarrier in frequency domain k compensation initial phases long
Value afterwards,ForConjugation, k ∈ { k1, k2, N-k1, N-k2 }.
7. the IQ based on initial phase compensation according to claim 6 is uneven estimates and compensation method, it is characterised in that
In the step S301, according to IQ imbalance associated expressions μrAnd vrEstimate IQ amplitude imbalances αrWith IQ unbalance in phase θr,
Formula isWherein, η=- μr/vr *,
Gain=(- b ± sqrt (b2- 4))/2,vr *For vrConjugation, real (η) is the real part of η,
Imag (η) is the imaginary part of η, and arctan is tangent of negating.
8. the IQ based on initial phase compensation according to claim 7 is uneven estimates and compensation method, it is characterised in that
In the step S302, by formulaThe docking collection of letters numberIQ imbalance compensations are carried out, its
In,μr' and vr' it is respectively IQ width
Degree imbalance αrWith unbalance in phase θrBy the plural number that formula is constituted.
9. the uneven estimations of the IQ based on initial phase compensation and compensation method according to claim 1 to 8 any one,
Characterized in that, in the step S1, enter that line slip is related to transport with local signal short training sequence using signal short training sequence is received
Calculate, the starting point for receiving signal short training sequence is obtained by similarity degree, and then derive the original position for receiving signal frame, this
Individual process is thick synchronizing process；According to the frame start position that thick synchronizing process is obtained, obtain and receive the position that Chief Signal Boatswain instructs sequence,
Then local signal instruction sequence long enters line slip related operation with Chief Signal Boatswain instruction sequence is received, and is obtained by similarity degree and receives letter
Number instruction sequence long starting point, and then corrected received signal frame original position, this process is smart synchronizing process.
10. a kind of IQ based on initial phase compensation is uneven estimates and compensation device, it is characterised in that employing right such as will
The uneven estimations of IQ and compensation method for asking the initial phase described in 1 to 9 any one to compensate, and including：
Synchronization module, by receiving the short training sequence of signal and local signal and the signal autocorrelation of instruction sequence long, detects
The frame header position of signal is received, it is then determined that receiving the position of each data field in signal；
Initial phase estimation and compensating module, using instruction sequence frequency domain characteristic long, are believed by local signal instruction sequence long and reception
The frequency domain phase difference of instruction sequence number long, estimates initial phase, then by the compensation of this initial phase to receiving Chief Signal Boatswain instruction sequence
On row；
IQ is uneven to be estimated and compensating module, using the frequency domain characteristic for compensating the instruction sequence long after initial phase, estimates to receive letter
Number IQ amplitude imbalances and IQ unbalance in phase, and IQ imbalance compensations are carried out to the whole signal that receives；
Channel estimation and parsing module, to completing the reception signal after IQ imbalance compensations, channel estimation are done using instruction sequence long,
Balancing operational and parsing are carried out to receiving data field.
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