CN103747517B - frequency synchronization method and device - Google Patents
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Abstract
The present invention relates to the communications fields, and in particular to a kind of frequency synchronization method and device.A kind of frequency synchronization method, including：The extraction burst head in burst；Frequency offset estimation and phase equivocation are carried out to the burst head；Frequency departure compensation is carried out to the burst received using the frequency offset estimation, phase deviation compensation is carried out to the burst received using affiliated phase equivocation；Unique word is extracted from the burst after phase deviation compensation；Phase ambiguity elimination is carried out to the burst after phase compensation using the unique word, carries out Frequency Synchronization.A kind of frequency synchronization device, including：First extraction module, estimation module, the first compensating module, the second extraction module and processing module.By the present invention, using the method for unbound nucleus into line frequency and phase equivocation, without using unique word, solve the problems, such as that accuracy of estimation is relatively low when unique word symbolic number is less.
Description
Technical field
The present invention relates to the communications fields, and in particular to a kind of frequency synchronization method and device.
Background technology
With the development of information communication industry, China's land mobile communication system is more flourishing.However, due to China
It is vast in territory, geographical environment is various, population distribution is uneven, land mobile communication system covers only the territory face in China 30%
Product, the national territorial area that there remains 70% lack Base communication guarantee.Satellite mobile communication system then can be effective by satellite
Its coverage area is extended, so that can user terminal be accessed into public or private wire network in the world.Therefore, satellite moves
A dynamic important component of the communication system as ICT industry, it is anti-in national information infrastructure construction, promotion country
Calamity emergency capability safeguards that national unipolitics economic interests etc. have critical role.
In satellite mobile communication system, due between the unstability of local crystal oscillator frequency and terminal and satellite
Doppler frequency shift caused by relative movement can cause to receive between the frequency of signal and the frequency of local crystal oscillator in the presence of centainly inclined
Difference.Particularly aviation terminal, movement speed maximum can reach 1000 kilometers/hour, so as to cause larger frequency departure.Only
Have and accurately estimate the frequency departure and compensate, normal demodulation decoding could be carried out.Therefore, it is logical in satellite movement
In letter system, Frequency Synchronization is the key that realize the premise normally received and raising system performance.
For Frequency Synchronization in the relevant technologies ratio of precision it is relatively low the problem of, do not propose solution so far.
Invention content
In order to achieve the above object, it is of the invention to provide a kind of frequency synchronization method and device.
According to an aspect of the invention, there is provided a kind of frequency synchronization method, is included in burst and extracts burst
Head；Frequency offset estimation and phase equivocation are carried out to the burst head；Using the frequency offset estimation to receiving
Burst carries out frequency departure compensation, and it is inclined to carry out phase to the burst received using the phase equivocation
Difference compensation；Unique word is extracted from the burst after phase deviation compensation；Phase deviation is mended using the unique word
Burst after repaying carries out phase ambiguity elimination, carries out Frequency Synchronization.
Preferably, after the frequency offset estimation is used to carry out frequency departure compensation to the burst received,
It further includes：Burst after being compensated using the method for unbound nucleus the frequency departure carries out phase equivocation；
Burst after being compensated using the phase equivocation the frequency departure carries out phase deviation compensation.
Preferably, the burst after being compensated using the unique word phase deviation carries out phase ambiguity elimination, carries out
Frequency Synchronization includes：The unique word of extraction and local unique word are subjected to relevant treatment and obtain phase ambiguity detected value；Make
Burst after being compensated with the phase ambiguity detected value the phase deviation carries out phase ambiguity elimination.
The embodiment of the present invention provides a kind of frequency synchronization device, including：First extraction module, for being carried in burst
Take burst head；Estimation module, for carrying out frequency offset estimation and phase equivocation to the burst head；First compensation mould
Block, it is inclined using the phase for carrying out frequency departure compensation to the burst received using the frequency offset estimation
Difference estimation carries out phase deviation compensation to the burst received；Second extraction module, for from the phase deviation
Unique word is extracted in burst after compensation；Processing module, for using the unique word to prominent after phase deviation compensation
It signals to carry out phase ambiguity elimination, carries out Frequency Synchronization.
Preferably, the device, further includes：Estimation module, for using the method for unbound nucleus to the frequency
Burst after deviation compensation carries out phase equivocation；Second compensating module, for using the phase equivocation
Burst after compensating the frequency departure carries out phase deviation compensation.
Preferably, the processing module includes：First processing units, for by the unique word extracted and locally unique
Word carries out relevant treatment and obtains phase ambiguity detected value；Second processing unit, for using the phase ambiguity detected value to institute
It states the burst after phase deviation compensation and carries out phase ambiguity elimination.
By the present invention, using the method for unbound nucleus into line frequency and phase equivocation, without using solely
Special word solves the problems, such as that accuracy of estimation is relatively low when unique word symbolic number is less.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Some bright embodiments, for those of ordinary skill in the art, without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the flow chart of frequency synchronization method according to the present invention；
Fig. 2 is the structure diagram of PNB2 according to the present invention (5,3) bursts；
Fig. 3 is simulation result schematic diagram according to the present invention.
Specific embodiment
Purpose, technical scheme and advantage to make the embodiment of the present invention are clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
All other embodiments obtained without creative efforts shall fall within the protection scope of the present invention.
It is described in detail with reference to preferred embodiment.
This preferred embodiment provides a kind of frequency synchronization method, and Fig. 1 is the stream of frequency synchronization method according to the present invention
Cheng Tu, as shown in Figure 1, this method comprises the following steps S101 to step S108.
S101, burst head extraction：Burst head is extracted from burst, for frequency and phase equivocation.
S102, frequency offset estimation：Using the head that happens suddenly, frequency offset estimation is carried out using the method for unbound nucleus.
S103, frequency departure compensation：According to frequency offset estimation value, frequency departure benefit is carried out to the burst of reception
It repays.
S104, phase equivocation：There are still random phase offsets for burst after being compensated due to frequency departure, utilize
Happen suddenly head, and phase equivocation is carried out using the method for unbound nucleus.
S105, phase deviation compensation：According to phase equivocation value, the burst after compensating frequency departure carries out phase
Position deviation compensation.
S106, unique word extraction：The unique word in burst after compensating phase deviation extracts, for phase
Blur estimation.
S107, phase ambiguity detection：Burst after being compensated due to phase deviation is there may be phase ambiguity, using only
Special word carries out phase ambiguity detection using method relevant with local unique word.
S108, phase ambiguity are eliminated：According to phase ambiguity detected value, the burst after compensating phase deviation carries out phase
Position is fuzzy to be eliminated, so as to accurately realize Frequency Synchronization.
This preferred embodiment provides a kind of frequency synchronization method, and the scene in the preferred embodiment is as follows：In certain synchronization
In earth-orbiting satellite mobile communication system, signal frame uses the structure of time division multiplexing (TDMA).Each superframe includes 4 again
Frame, each multi-frame include 16 TDMA frames, and for each TDMA frame again comprising 24 time slots, each time slot includes 39 symbols.
Different logic channels uses different bursts.For example, packet data traffic channel PDTCH2 (5,3) occupies 5
Subcarrier, 3 time slots, the structure of PNB2 (5, the 3) bursts of use are as shown in Figure 2.Wherein, burst head (Burst Header) exists
Before, including protection interval (Guard), unique word (UW), public information (PUI) and burst transition (TR), remainder includes private
People's information (PRI), unique word (UW) and protection interval (Guard).The head that happens suddenly is modulated using QPSK, personal information (PRI) basis
QPSK, 16APSK or 32APSK modulation may be used in system requirements.
It is specifically described below.
Step S201, burst head extraction
Burst head is extracted from burst, for frequency and phase equivocation.
If the burst received is r (k), k=0,1 ..., K-1, the burst head extracted from burst r (k) is x
(n), n=0, wherein 1 ..., N-1, K are burst symbolic number, and N is burst head symbolic number.It happens suddenly for PNB2 (5,3), K
=585, N=66.
Step S202, frequency offset estimation
Using the head that happens suddenly, frequency offset estimation is carried out using the method for unbound nucleus.
M power processing is carried out to burst head x (n), obtains xM(n), n=0,1 ..., N.Since burst head uses QPSK tune
It makes, M=4, can effectively reduce the complexity of calculating.
To xM(n) auto-correlation before and after carrying out, obtains auto-correlation function
Frequency offset estimation value can be obtained by auto-correlation function R (m)
Wherein arg () expressions take phase, TSFor the symbol time period, parameter D can be according to needed for frequency offset estimation
Range is suitably chosen.
Step S203, frequency departure compensation
According to frequency offset estimation value Δ f, frequency departure compensation is carried out to burst r (k), obtains frequency departure compensation
Burst afterwards
S (k)=r (k) exp (- j2 π Δs fkTS), k=0,1 ..., K-1
Step S204, phase equivocation.
Burst after being compensated due to frequency departure is there are still random phase offset, using the head that happens suddenly, using non-data
The method of auxiliary carries out phase equivocation.
If the burst head extracted from burst s (k) is y (n), n=0,1 ..., N-1.
M power processing is carried out to burst head y (n), obtains yM(n), n=0,1 ..., N.Since burst head uses QPSK tune
It makes, M=4, can effectively reduce the complexity of calculating.
Phase equivocation value can be by yM(n) it obtains
Step S105, phase deviation compensation.
According to phase equivocation valueBurst s (k) after compensating frequency departure carries out phase deviation compensation,
Obtain the burst after phase deviation compensation
Step S106, unique word extraction.
The unique word in burst after compensating phase deviation extracts, and estimates for phase ambiguity.
If the unique word extracted from burst t (k) is z (l), l=0,1 ..., L-1, wherein L is unique word symbol
Number.It happens suddenly for PNB2 (5,3), L=25,14 or 13.
Step S107, phase ambiguity detection.
Burst after being compensated due to phase deviation is there may be phase ambiguity, using unique word, using only with local
The special relevant method of word carries out phase ambiguity detection.
By the unique word z (l) of extraction and local unique word u (l), l=0,1 ..., L-1 carry out cross-correlation, and to correlation
Value carries out phase place
Phase ambiguity value can be obtained by detecting the real part size of the correlation C (i) after phase place
I:C (I)=max (real (C (i))), i=0,1 ..., M-1
Wherein, real () expressions take real part, and max () expressions are maximized.
Step S108, phase ambiguity are eliminated.
Phase ambiguity elimination is carried out according to phase ambiguity detected value I, the burst t (k) after compensating phase deviation
So as to accurately realize Frequency Synchronization.
By the technical solution in above-described embodiment and preferred embodiment, under additive white Gaussian noise (AWGN) channel,
When frequency departure is 35Hz, using the above method carry out frequency offset estimation and compensation, phase equivocation and compensation and
After phase ambiguity is detected and eliminated, the error sign ratio for receiving burst is as shown in Figure 3.It is as can be seen that same using said frequencies
Performance after one step process almost under awgn channel without frequency departure when theoretical performance it is consistent.
A kind of frequency synchronization device is present embodiments provided, the device is described in detail below.
According to another aspect of the invention, a kind of frequency synchronization device is additionally provided, including：First extraction module, is used for
The extraction burst head in burst；Estimation module, for estimating to the burst head progress frequency offset estimation and phase deviation
Meter；First compensating module for carrying out frequency departure compensation to the burst received using the frequency offset estimation, makes
Phase deviation compensation is carried out to the signal received with the phase equivocation；Second extraction module, for from described
Unique word is extracted in burst after phase deviation compensation；Processing module, for the unique word to be used to mend phase deviation
Burst after repaying carries out phase ambiguity elimination, carries out Frequency Synchronization.
Preferably, above device further includes：Estimation module, for using the method for unbound nucleus to the frequency departure
Burst after compensation carries out phase equivocation；Second compensating module, for using the phase equivocation to institute
State the burst progress phase deviation compensation after frequency departure compensation.
Preferably, the processing module includes：First processing units, for by the unique word of the extraction and locally unique
Word carries out relevant treatment and obtains phase ambiguity detected value；Second processing unit, for using the phase ambiguity detected value to institute
It states the burst after phase deviation compensation and carries out phase ambiguity elimination.
By the above-mentioned technical proposal of the present invention, using the method for unbound nucleus into line frequency and phase equivocation,
Without using unique word, solve the problems, such as that accuracy of estimation is relatively low when unique word symbolic number is less.Utilize low-order-modulated
Burst head into line frequency and phase equivocation, can effectively reduce the complexity of calculating.It only needs to use a small amount of uniqueness
Word carries out phase ambiguity elimination, you can accurately realizes Frequency Synchronization.It should be noted that the technical solution of the application can be wide
It is general to be suitable for various satellite mobile communication systems.
One of ordinary skill in the art will appreciate that：Realizing all or part of step of above method embodiment can pass through
The relevant hardware of program instruction is completed, and aforementioned program can be stored in a computer read/write memory medium, the program
When being executed, step including the steps of the foregoing method embodiments is performed；And aforementioned storage medium includes：ROM, RAM, magnetic disc or light
The various media that can store program code such as disk.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that：It still may be used
To modify to the technical solution recorded in foregoing embodiments or carry out equivalent replacement to which part technical characteristic；
And these modification or replace, various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (2)
1. a kind of frequency synchronization method, which is characterized in that the usage scenario of this method is：It is moved in certain geosynchronous earth orbit satellite
In communication system, signal frame uses the structure of time division multiplexing (TDMA)；Each superframe includes 4 multi-frames, and each multi-frame includes 16
A TDMA frame, for each TDMA frame again comprising 24 time slots, each time slot includes 39 symbols；
The method includes：
The extraction burst head in burst；
Frequency offset estimation and phase equivocation are carried out to the burst head；M power processing first is carried out to burst head, is being carried out
Front and rear auto-correlation obtains auto-correlation function R (m)；
Frequency departure compensation is carried out to the burst received using the frequency offset estimation, is estimated using the phase deviation
It counts and phase deviation compensation is carried out to the burst received；
Unique word is extracted from the burst after phase deviation compensation；
Burst after being compensated using the unique word phase deviation carries out phase ambiguity elimination, carries out Frequency Synchronization；
After the frequency offset estimation is used to carry out frequency departure compensation to the burst received, further include：
Burst after being compensated using the method for unbound nucleus the frequency departure carries out phase equivocation；
Burst after being compensated using the phase equivocation the frequency departure carries out phase deviation compensation；
Burst after being compensated using the unique word phase deviation carries out phase ambiguity elimination, carries out Frequency Synchronization packet
It includes：
The unique word of extraction and local unique word are subjected to relevant treatment and obtain phase ambiguity detected value；
Burst after being compensated using the phase ambiguity detected value the phase deviation carries out phase ambiguity elimination；
The numerical value of frequency offset estimation is calculated according to equation below：
Wherein, arg () expressions take phase, TSFor the symbol time period, parameter D can be according to the range needed for frequency offset estimation
Suitably chosen；
Burst after being compensated according to equation below phase deviation carries out phase ambiguity elimination：
Wherein, I is phase ambiguity detected value；S (k) is frequency departure
Burst after compensation；T (k) is the burst after phase deviation compensation.
2. a kind of frequency synchronization device, which is characterized in that including：
First extraction module, for the extraction burst head in burst；
Estimation module, for carrying out frequency offset estimation and phase equivocation to the burst head；First burst head is carried out M times
Side's processing, auto-correlation obtains auto-correlation function R (m) before and after progress；
First compensating module, for carrying out frequency departure compensation to the burst received using the frequency offset estimation,
Phase deviation compensation is carried out to the burst received using the phase equivocation；
Second extraction module, for extracting unique word from the burst after phase deviation compensation；
Processing module carries out phase ambiguity elimination for the burst after the unique word is used to compensate phase deviation, into
Line frequency synchronizes；
It further includes：
Estimation module, the burst after the method for using unbound nucleus compensates the frequency departure carry out phase
Estimation of deviation；
Second compensating module carries out for the burst after the phase equivocation is used to compensate the frequency departure
Phase deviation compensates；
The processing module includes：
First processing units obtain phase ambiguity inspection for the unique word extracted and local unique word to be carried out relevant treatment
Measured value；
Second processing unit carries out for the burst after the phase ambiguity detected value is used to compensate the phase deviation
Phase ambiguity is eliminated；
The numerical value of frequency offset estimation is calculated according to equation below：
Wherein, arg () expressions take phase, TSFor the symbol time period, parameter D can be according to the range needed for frequency offset estimation
Suitably chosen；
Burst after being compensated according to equation below phase deviation carries out phase ambiguity elimination：
Wherein, I is phase ambiguity detected value；S (k) is frequency departure
Burst after compensation；T (k) is the burst after phase deviation compensation.
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| CN105743563B (en) * | 2016-04-21 | 2018-10-09 | 中国电子科技集团公司第五十四研究所 | A kind of demodulation method of satellite mobile communication system DKAB |
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| CN101588333B (en) * | 2008-05-22 | 2012-05-23 | 赵力 | A Synchronization Method Applicable to China's National Standard for Digital TV Terrestrial Broadcasting |
| CN101553028B (en) * | 2009-04-30 | 2011-06-15 | 西南交通大学 | Frequency offset and phase estimation method based on differential phase in TD-SCDMA communication system receiving synchronization |
| CN101626357B (en) * | 2009-09-22 | 2012-05-09 | 北京理工大学 | A Carrier Synchronization Method for MPSK System Based on Maximum Likelihood Estimation |
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