CN106534010B - A kind of phase equivocation of OQPSK signal demodulation and compensation method - Google Patents
A kind of phase equivocation of OQPSK signal demodulation and compensation method Download PDFInfo
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- CN106534010B CN106534010B CN201611073120.XA CN201611073120A CN106534010B CN 106534010 B CN106534010 B CN 106534010B CN 201611073120 A CN201611073120 A CN 201611073120A CN 106534010 B CN106534010 B CN 106534010B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/20—Modulator circuits; Transmitter circuits
- H04L27/2003—Modulator circuits; Transmitter circuits for continuous phase modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
- H04L2027/0026—Correction of carrier offset
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- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
Phase equivocation and the compensation method of a kind of OQPSK signal demodulation is claimed in the present invention, is related to mobile communication technology field.In order to realize that OQPSK modulated signal accurate Carrier Phase synchronization, the method for the present invention include: to carry out biquadratic according to phase deviation estimation method to the signal after frequency offset estimation compensation and go to modulate, realize phase deviation according to a preliminary estimate；Taking phase deviation, value carries out actual phase interval mapping according to a preliminary estimate；Inherent spurious frequency deviation estimation is carried out using the last period actual phase value and this section of actual phase value, eliminating inherent spurious frequency deviation influences；It is detected between phase hit point the phase value that inherent spurious frequency deviation influences carries out section is eliminated, the number of segment for generating phase hit is carried outPhasing realizes that phase deviation is accurately estimated.The present invention is the longer OQPSK signal of time burst, and phase hit correction provides a kind of simple and effective solution between section and section.
Description
Technical field
The present invention relates to mobile communication digital modulating and demodulating signal field, specifically OQPSK signal demodulation phase deviation is estimated
Meter and compensation method.
Background technique
OQPSK (Offset Quadrature Phase Shift Keying, offset quadrature phase-shift-keying) is after QPSK
A kind of permanent envelope digital modulation technique to grow up later, compared with QPSK, quadrature branch symbol and in-phase branch code
Member offsets by a bit interval, i.e. half symbols period in time.The π phase that OQPSK signal eliminates adjacent-symbol is inclined
Turn phenomenon, in the limited practical communication system of bandwidth, envelope fluctuating is small, will not generate after nonlinear power amplifier bright
Aobvious power secondary lobe proliferative effect has the characteristics that operating factor of highband and high-power.Currently, OQPSK signal is widely used in defending
In star communication, such as TDMA, in cdma system, it has also become common a kind of modulation system in non-linear bandwidth efficient channel.
Since noise and self noise influence, the frequency offset estimation result obtained through frequency deviation estimating method is simultaneously not equal to practical frequency
Partially.Therefore, it receives signal of the signal after correcting frequency deviation and still has inherent spurious frequency deviation.Only because inherent spurious frequency deviation phase at this time
It is sufficiently small for character rate, so inherent spurious frequency deviation causes phase change slow in one time burst of burst signal,
In a time burst, carrier phase is expressed as formula (1):
Wherein,Indicate that average phase of the carrier wave in a time burst, n (k) are noise.Think to happen suddenly at one
Without frequency deviation in time, onlyRepresented skew.In order to reduce the influence generated by inherent spurious frequency deviation to system performance, need
It estimates after frequency deviation compensates included in signalInformation, i.e. carrier phase estimation of deviation.
If the signal burst time is shorter, a phase estimation is carried out in a time burst, but if when happening suddenly
Between it is longer, then assume again that in a time burst and exist just less rationally without inherent spurious frequency deviation.For the longer situation of time burst,
Assume to carry out phase equivocation without frequency deviation, and to every one piece of data in a period of time.The shortcomings that processing method generates is meeting
Generate the phase hit between section and section, i.e. phase ambiguity between section and section.It cannot complete OQPSK signal demodulation carrier phase
Accurate synchronization.
Summary of the invention
The present invention is directed to during existing digital phase modulation signal carrier phase synchronization, and phase hit method is not between processing section
Foot, designs a kind of method suitable for OQPSK modulated signal carrier phase accurate synchronization.OQPSK signal may be implemented in this method
The accurate estimation and adjustment of phase deviation, eliminate continuous data segment caused by phase hit caused by inherent spurious frequency deviation and random noise
Phase hit, realize long burst OQPSK signal carrier phase accurate synchronization.
To achieve the goals above the present invention adopts the following technical scheme: a kind of phase deviation of OQPSK signal demodulation is estimated
Meter and compensation method, comprising the following steps:
A, to the signal R that sign synchronization and frequency offset estimation and compensation is completedk, it carries out biquadratic and goes modulation treatment,
The preresearch estimates that phase deviation is carried out by phase deviation algorithm, obtains phase deviation φ according to a preliminary estimatei。
B, to phase deviation φ according to a preliminary estimateiActual phase interval mapping is carried out, actual phase value is obtained.
C, inherent spurious frequency deviation value is estimated to two sections before and after actual phase value, inherent spurious frequency deviation value is added by actual phase value, is estimated
Calculate accurate actual phase value.Inherent spurious frequency deviation is specially the actual phase difference of this section with the last period.
D, judge the front and back data segment of data segment locating for accurate actual phase value phase estimation absolute value whether be more thanDetect the data segment of continuous phase jump.Phase hit caused by Removing Random No.
E, to there are the progress of the phase of phase jump data sectionPhase adjustment obtains accurate phase equivocation value,
The jump of continuous phase caused by Removing Random No.
F, phase compensation is carried out to OQPSK signal subsection according to accurate phase equivocation value, completes signal demodulation.
The phase deviation φ according to a preliminary estimateiIt is obtained by the following formula,Wherein M is
Phase number in OQPSK signal modulation mode, the value of M are that 4, L is observation data length.
In the step A, the signal R of sign synchronization and frequency offset estimation and compensation is completedkIt indicates are as follows:
Wherein, AkFor the compensated data of frequency deviation, nkIt is 0 for mean value, variance N0Additive white Gaussian noise, φiFor phase
Position deviation, L are observation data length, then observe the joint probability density function of data are as follows:
Wherein, N0Indicate the variance of white Gaussian noise,WithRespectively with φiAnd AkFor the stochastic variable of valued space.
p(φi,{Ak) indicate to receive the joint probability density function of data, outlier is removed, φ can be obtainedi{ AkJoint likelihood letter
Number are as follows:
Symbol sebolic addressing is averaging based on unbound nucleus algorithm:
φiMaximal possibility estimation be make remove outlier joint likelihood function Λ (φi) obtain maximum valueFor
Shortening carrier phase capture time, the carrier phase synchronization algorithm assisted using no clock, for OQPSK signal, realization side
Method is as follows:
Biquadratic operation is carried out to the compensated data of frequency deviation, carries out finding out corresponding angle value after adding up with certain length
In addition intrinsicConstant phase deviates to obtain phase deviation according to a preliminary estimate, after which eliminates phase hit, for driving numerical control to shake
It swings device and carries out phase compensation.
In above scheme actual phase interval mapping include will phase deviation φ according to a preliminary estimateiEstimate with being averaged for one piece of data
It calculates phase to be compared, taking the smallest average evaluation phase of difference in comparison is actual phase value.
The phase gone out by carrier phase bias estimation method calculationiIt is limited inIn range, and it is actual
Phase may be φi,In one.Assuming that the (n-1)th segment signal in a burst
Actual phase beWherein 0≤m≤M-1, since inherent spurious frequency deviation is minimum and practical phase
Position is in [0,2 π] interior continuity, the actual phase of the n-th segment signal
Centainly it is closest toThat value.The actual phase estimated value before the n-th segment signal is considered, when the reality of the n-th segment signal
Border phase is both less than relative to the changing value of N sections of actual phaseThen eliminate phase hit phenomenon.Last data section is real
Border phase value and notebook data section actual phase value are closest, the present invention by last data section phase value carry out interval mapping,
Inherent spurious frequency deviation value is estimated, inherent spurious frequency deviation is added by actual phase value, estimates the actual phase value of each data segment, is eliminated remaining
Phase hit caused by frequency deviation.
The present invention solves long burst OQPSK signal carrier and synchronizes, phase between divided carrier phase deviation finding process middle section
Position jump problem.On the basis of preliminary carrier phase deviation is sought, eliminates phase hit caused by inherent spurious frequency deviation and make an uproar at random
The phase hit of continuous segment caused by sound realizes the accurate synchronization of carrier phase.
Detailed description of the invention
Fig. 1 is flow chart of the invention；
The receiving end Fig. 2 OQPSK signal demodulates schematic diagram；
Fig. 3 phase compensation flow chart；
Fig. 4 phase deviation estimation algorithm flow chart；
Fig. 5 phase hit detects correcting algorithm flow chart.
Specific embodiment
The process of the method for the present invention is as shown in Figure 1.According to phase deviation estimation method, to the signal after frequency offset estimation compensation
It carries out biquadratic to go to modulate, realizes phase deviation according to a preliminary estimate；Taking phase deviation, value carries out the change of actual phase section according to a preliminary estimate
It changes；Inherent spurious frequency deviation estimation is carried out using the last period actual phase value and this section of actual phase value, eliminating inherent spurious frequency deviation influences；It offsets
Phase hit point detects between the phase value progress section influenced except inherent spurious frequency deviation, carries out to the number of segment for generating phase hitPhase school
Just, realize that phase deviation is accurately estimated.The carrier phase being segmented according to phase compensation mode shown in Fig. 3 to data compensates.
OQPSK signal receiving end demodulation as shown in Fig. 2, X (t) be send signal, n (t) be noise, signal by filtering,
After resampling processing, the estimation and compensation of sign synchronization timing and carrier wave frequency deviation are completed.Due to the influence of noise and self noise, warp
Frequency offset estimation result that frequency excursion algorithm obtains simultaneously is not equal to practical frequency deviation.Therefore, signal is received after correcting frequency deviation
Signal still has inherent spurious frequency deviation, so that receiving signal carrier, there are phase deviation, i.e. carrier phase offset, institutes with local carrier
To carry out the estimation and compensation of phase deviation by algorithm, to reach the accurate demodulation of signal.
In algorithm of the invention, two kinds of algorithms, i.e. phase equivocation algorithm and phase hit detection correction are contained
Algorithm.What Fig. 4 was indicated is phase equivocation algorithm, and specific step includes as follows:
Step 31, Symbol Timing and the compensated OQPSK signal subsection input of frequency offset estimation have been completed.
Step 32, the data all to data segment seek angle, and the angled summation of institute is averaged, and obtain phase value fi_i.
Step 33, biquadratic is asked to the segment data of input, goes to modulate, go modulated data, seek angle and make even
, initial estimation phase value fi is obtained.
Step 34, fi realizes possible phase interval transformation by interval mapping principle, i.e.,
Step 35, the size for comparing the absolute value deviation of fi_i and fi_n takes the smallest index value min_dex of deviation.
Step 36, this section of actual phase value is calculated,
Corresponding Fig. 5 is that phase hit detects correcting algorithm flow chart, and the specific method is as follows；
Step 41, all sections of segment data of actual phase value is inputted；
Step 42, it by the actual phase value of this section and N sections first (all sections of phases before this section) actual phase value, calculates
The value of all accumulative inherent spurious frequency deviations out, inherent spurious frequency deviation are specially the phase difference value of this section with the last period, later the practical phase of this section
Place value becomes the sum of the last period and inherent spurious frequency deviation, and so on.
Step 43, to all actual phase value foundationsWherein, θ (i), θ (i-1) are
The actual phase value of two sections of front and back, to discriminate whether there are phase hit point, if not, it is then the beginning of continuous phase jump
Section, ending segment be next number of segment for being unsatisfactory for phase determination, until next number of segment for being unsatisfactory for phase determination start it is new
Continuous segment phase hit.
Step 44, it to the phase value of phase hit section, carries outPhase adjustment so far obtains accurate phase equivocation
Value.
The present invention solves long burst OQPSK signal carrier and synchronizes, phase between divided carrier phase error finding process middle section
Position jump problem.On the basis of preliminary carrier error is sought, eliminates phase hit caused by inherent spurious frequency deviation and random noise is drawn
The phase hit of the continuous segment risen, realizes the accurate synchronization of carrier phase.
Claims (4)
1. phase equivocation and the compensation method of a kind of OQPSK signal demodulation, which comprises the following steps:
A, to the signal R that sign synchronization and frequency offset estimation and compensation is completedk, carry out biquadratic and go modulation treatment, pass through phase
Position deviation algorithm carries out the preresearch estimates of phase deviation, obtains phase deviation φ according to a preliminary estimatei；
B, to phase deviation φ according to a preliminary estimateiActual phase interval mapping is carried out, actual phase value is obtained；
C, inherent spurious frequency deviation value is estimated to two sections before and after actual phase value, inherent spurious frequency deviation value is added by actual phase value, is estimated
Accurate actual phase value；
D, judge the front and back data segment of data segment locating for accurate actual phase value phase estimation absolute value whether be more thanDetection
The data segment of continuous phase jump out, M are phase number in OQPSK signal modulation mode；
E, to there are the progress of the phase of phase jump data sectionPhase adjustment obtains accurate phase equivocation value；
F, phase compensation is carried out to OQPSK signal subsection according to accurate phase equivocation value, completes signal demodulation.
2. a kind of phase equivocation of OQPSK signal demodulation and compensation method according to claim 1, it is characterised in that:
The phase deviation φ according to a preliminary estimateiIt is obtained by the following formula,Wherein M is OQPSK signal
Phase number in modulation system, L are observation data length.
3. a kind of phase equivocation of OQPSK signal demodulation and compensation method according to claim 2, it is characterised in that:
The value of the M is 4.
4. a kind of phase equivocation of OQPSK signal demodulation and compensation method according to claim 1, it is characterised in that:
The actual phase interval mapping includes will phase deviation φ according to a preliminary estimateiReal transform phase interval and one piece of data it is flat
Equal evaluation phase is compared, and taking the smallest real transform phase of difference in comparison is actual phase value.
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| CN107864106A (en) * | 2017-11-24 | 2018-03-30 | 成都玖锦科技有限公司 | A kind of MPSK carrier synchronization methods suitable for unbound nucleus |
| CN108566353B (en) * | 2018-03-20 | 2020-12-15 | 北京睿信丰科技有限公司 | Continuously corrected carrier synchronization device and method |
| CN108900458B (en) * | 2018-06-05 | 2019-07-09 | 北京理工大学 | The compound qpsk modulation signal optimization method of ranging/communication under non-ideal quadrature carrier |
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| US7606342B1 (en) * | 2006-04-05 | 2009-10-20 | L-3 Communications Titan Corporation | Tracking the phase of a received signal |
| CN102075472A (en) * | 2011-02-16 | 2011-05-25 | 四川九洲电器集团有限责任公司 | Method for spreading intermediate frequency of OQPSK and despreading and demodulating spread intermediate frequency |
| CN103873160A (en) * | 2012-12-12 | 2014-06-18 | 北京普源精电科技有限公司 | Method and device for changing phase jump of phase shift keying (PSK) |
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