CN109639385A - Broadband diversity synchronous method and system based on CAZAC sequence - Google Patents

Broadband diversity synchronous method and system based on CAZAC sequence Download PDF

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Publication number
CN109639385A
CN109639385A CN201811641949.4A CN201811641949A CN109639385A CN 109639385 A CN109639385 A CN 109639385A CN 201811641949 A CN201811641949 A CN 201811641949A CN 109639385 A CN109639385 A CN 109639385A
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diversity
cazac sequence
broadband
energy
sequence
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CN201811641949.4A
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CN109639385B (en
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姚璐
姚玉征
魏强
卢圣龙
程敏敏
朱正毅
赵利凯
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Shanghai Institute Of Microwave Technology (fiftieth Research Institute Of China Electronic Technology Group Corporation)
Shanghai Institute of Microwave Technology CETC 50 Research Institute
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Shanghai Institute Of Microwave Technology (fiftieth Research Institute Of China Electronic Technology Group Corporation)
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0602—Systems characterised by the synchronising information used
    • H04J3/0605—Special codes used as synchronising signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/0055—ZCZ [zero correlation zone]
    • H04J13/0059—CAZAC [constant-amplitude and zero auto-correlation]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0602—Systems characterised by the synchronising information used
    • H04J3/0605—Special codes used as synchronising signal
    • H04J3/0608—Detectors therefor, e.g. correlators, state machines

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Radio Transmission System (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present invention provides a kind of broadband diversity synchronous method and system based on CAZAC sequence, comprising: CAZAC sequence determines step: determining required CAZAC sequence；Broadband diversity synchronizes determining step: according to determining CAZAC sequence, obtaining sync bit by the synchronous operation of broadband diversity.The present invention is lifted at synchronous precision stability in the case of low signal-to-noise ratio by diversity simultaneous techniques, can effective guarantee overall communication system communication performance；Timing accuracy, the stability, reliability at wireless communication receiver end can effectively be improved.

Description

Broadband diversity synchronous method and system based on CAZAC sequence
Technical field
The present invention relates to fields of communication technology, and in particular, to is based on CAZAC (Const Amplitude Zero Auto-Corelation, permanent envelope zero auto-correlation) sequence broadband diversity synchronous method and system.
Background technique
In a wireless communication system, especially in digital communication systems, synchronizing is an extremely important problem.In number In word communication system, OFDM (Orthogonal Frequency Division Multiplexing, i.e. orthogonal frequency division multiplexing) Technology has many advantages, such as band efficiency height, anti-multipath fading, but compared with single-carrier technology, OFDM is more quick to synchronous error Sense.Once synchronizing inaccuracy, caused intersymbol interference (ISI) and inter-sub-carrier interference (ICI) will weaken the excellent of OFDM significantly Point, so the realization synchronized to OFDM receiver is most important.Synchronize in OFDM mainly includes Timing Synchronization, carrier frequency synchronization Three parts synchronous with sampling clock, wherein Timing Synchronization is mostly important.Because once Timing Synchronization is inaccurate, other two kinds of synchronizations And channel estimation will not know where to begin.
In order to solve stationary problem, there are two class methods in principle.First kind method is exactly using insertion assist in synchronization information Method is inserted into synchronizing information in the frequency or in the time domain, it is fast that such methods establish the synchronous time, but occupies communication system Frequency resource and power resource.Second class method is not have to assist in synchronization information, and directly from receiving, extraction in signal is synchronous to be believed Breath, the synchronization settling time of such methods is longer, but saves the frequency resource and power resource of system occupancy.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide a kind of broadband diversity based on CAZAC sequence is same One step process and system.
A kind of broadband diversity synchronous method based on CAZAC sequence provided according to the present invention, comprising:
CAZAC sequence determines step: determining required CAZAC sequence；
Broadband diversity synchronizes determining step: according to determining CAZAC sequence, being synchronized by the synchronous operation of broadband diversity Position.
Preferably, the CAZAC sequence akDetermination method include:
Wherein, k=0,1 ..., N-1；N is sequence length；R is any positive integer relatively prime with N；E is；J is.
Preferably, the broadband diversity synchronizes determining step includes:
Computing cross-correlation sub-step: carrying out mobile recurrence read group total according to signal energy is received, and to recurrence summation after Energy value be averaging again, calculate threshold value；
Enhanced diversity operation sub-step: the energy value obtained to mobile recurrence read group total is divided into n diversity, to each Energy value carries out computing cross-correlation in diversity, obtains the gross energy of each diversity, and carry out summation fortune to all diversity gross energies It calculates；
Normalization operation sub-step: the gross energy of resulting each diversity and all diversity gross energies are normalized, Normalized result and the threshold value are compared, obtain synchronous position.
Preferably, the mobile recurrence read group total includes:
mn+1=mn+|rn+1|2-|rn-L+1|2
Wherein,
rnTo receive signal, ωnFor noise, snFor signal, mnFor receive signal energy length of window L under accumulation and, CnFor CAZAC sequence, C* nFor sequence CnConjugation.
Preferably, normalized result DnAre as follows:
Dn=| Bn|2/|An|2；
Wherein, BnFor the gross energy of all diversity, AnFor the gross energy of each diversity.
A kind of broadband diversity synchronization system based on CAZAC sequence provided according to the present invention, comprising:
CAZAC sequence determining module: required CAZAC sequence is determined；
Broadband diversity synchronizes determining module: according to determining CAZAC sequence, being synchronized by the synchronous operation of broadband diversity Position.
Preferably, the CAZAC sequence CkDetermination method include:
Wherein, k=0,1 ..., N-1；N is sequence length；R is any positive integer relatively prime with N；E is；J is.
Preferably, the synchronous determining module of the broadband diversity includes:
Computing cross-correlation submodule: carrying out mobile recurrence read group total according to signal energy is received, and to recurrence summation after Energy value be averaging again, calculate threshold value；
Enhanced diversity operation submodule: the energy value obtained to mobile recurrence read group total is divided into n diversity, to each Energy value carries out computing cross-correlation in diversity, obtains the gross energy of each diversity, and carry out summation fortune to all diversity gross energies It calculates；
Normalization operation submodule: the gross energy of resulting each diversity and all diversity gross energies are normalized, Normalized result and the threshold value are compared, obtain synchronous position.
Preferably, the mobile recurrence read group total includes:
mn+1=mn+|rn+1|2-|rn-L+1|2
Wherein,
rnTo receive signal, ωnFor noise, snFor signal, mnFor receive signal energy length of window L under accumulation and, CnFor CAZAC sequence, C* nFor sequence CnConjugation.
Preferably, normalized result DnAre as follows:
Dn=| Bn|2/|An|2；
Wherein, BnFor the gross energy of all diversity, AnFor the gross energy of each diversity.
Compared with prior art, the present invention have it is following the utility model has the advantages that
The present invention is lifted at the precision stability synchronized in the case of low signal-to-noise ratio, can effectively be protected by diversity simultaneous techniques Hinder the communication performance of overall communication system；Timing accuracy, the stability, reliability at wireless communication receiver end can effectively be improved.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention, Objects and advantages will become more apparent upon:
Fig. 1 is flow chart of the invention；
Fig. 2 is broadband diversity synchronized algorithm performance map；
Fig. 3 is performance map of the broadband diversity synchronized algorithm under Gaussian white noise channel；
Fig. 4 is performance map of the broadband diversity synchronized algorithm under fading channel；
Fig. 5 is to compare figure using the ber curve of different rates under the conditions of Gaussian channel.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field For personnel, without departing from the inventive concept of the premise, several changes and improvements can also be made.These belong to the present invention Protection scope.
As shown in Figure 1, the broadband diversity synchronous method based on CAZAC sequence provided according to the present invention, including walk as follows It is rapid:
Step 1: determining CAZAC sequence；
Step 2: determining that broadband diversity is synchronous.
Wherein, step 1 includes the following steps:
Step 1.1: in, the method for CAZAC sequence needed for determining, CAZAC sequence full name is permanent envelope zero auto-correlation sequence, It realizes process are as follows:
Wherein, k=0,1 ..., N-1, N are sequence length.R is any positive integer relatively prime with N.
CAZAC sequence has the property that
A) permanent envelope trait.The constant amplitude of arbitrary CAZAC sequence, this characteristic can guarantee every in corresponding broadband A frequency point undergoes identical excitation, the unbiased esti-mator being easy to implement in relevant detection；
B) ideal periodical autocorrelation performance.It is mutual for any CAZAC original series and the sequence after its cyclic shift Uncorrelated, autocorrelation peak is sharp；
C) good cross correlation.I.e. different CAZAC takes root in sequence cross correlation value close to zero, and receiving end can be compared with Accurately carry out relevant detection；
D) low peak average ratio characteristic.The ratio of CAZAC sequence constant amplitude, time domain signal peak power and average power compared with It is low, it can reduce non-linearity of power amplifier distortion；
It e) is still CAZAC sequence after Fourier/inverse Fourier transform.
Wherein, step 2 determines that the synchronous method of broadband diversity includes the following steps:
Step 2.1: traditional computing cross-correlation based on CAZAC sequence
The energy that measurement receives signal is a kind of simplest Packet Detection Algorithms.When there is no data grouping arrival, connect Collection of letters rnIn only noise, i.e. rn=ωn；And when data grouping arrives, receive signal rnThe middle ingredient that signal is added, i.e. rn =sn+ωn, snFor signal,；CnFor CAZAC sequence, C* nFor sequence CnConjugation.It therefore, can be according to reception signal energy value It must change and be grouped detection.In order to avoid the influence for the big noise that happens suddenly, judgment variables mnIt is selected as receiving the window of signal energy Accumulation under length L and, be represented by
In fact, mnIt is the mobile summation for receiving signal energy, sliding window is also in the type summation, the basic principle is that In each moment n, summation can be added a new numerical value while abandon a numerical value just.Following formula is this mobile recurrence The calculating of summation
mn+1=mn+|rn+1|2-|rn-L+1|2 (3)
From the above equation, we can see that simplifying complicated multiplying using mobile recurrence summation, it is easier to realize.In order to avoid prominent The influence for sending out noise big, i.e., under the influence of noise, so that receiving energy occurs certain fluctuation in maximum value, so mn+1 When summation, the data after recurrence summation are averaging again, seek its threshold value.
Step 2.2: enhanced diversity operation
Traditional grouping energy measuring is compared the energy that 2.1 steps are found out with threshold value and obtains synchronous position, And 2.1 steps constitute just a subset of diversity operation in broadband diversity synchronizes.This step divides the energy value in 2.1 At n diversity, computing cross-correlation then is carried out to energy value in each diversity, so as to find out the gross energy A of each diversityn。
Summation operation is carried out to each diversity gross energy found out
Wherein, H is the different coefficients taken to different diversity.
Step 2.3: normalization operation
It is normalized to obtain D by the energy of the resulting each diversity of step 2.2 and the energy of total diversityn, then use institute The D obtainednValue and the threshold value of setting compare, to obtain synchronous position.
Dn=| Bn|2/|An|2 (6)
Simulation result from Fig. 2 to Fig. 5 can be seen that the concept for borrowing diversity technique, and synchronous performance is more preferable, passes through width The synchronous resulting sync bit of the operation sync bit more resulting than conventional procedures of band diversity is more acurrate and stablizes.
On the basis of the above-mentioned broadband diversity synchronous method based on CAZAC sequence, the present invention also provides one kind to be based on The broadband diversity synchronization system of CAZAC sequence, comprising:
CAZAC sequence determining module: required CAZAC sequence is determined；
Broadband diversity synchronizes determining module: according to determining CAZAC sequence, being synchronized by the synchronous operation of broadband diversity Position.
One skilled in the art will appreciate that in addition to realizing system provided by the invention in a manner of pure computer readable program code It, completely can be by the way that method and step be carried out programming in logic come so that the present invention provides and its other than each device, module, unit System and its each device, module, unit with logic gate, switch, specific integrated circuit, programmable logic controller (PLC) and embedding Enter the form of the controller that declines etc. to realize identical function.So system provided by the invention and its every device, module, list Member is considered a kind of hardware component, and to include in it can also for realizing the device of various functions, module, unit To be considered as the structure in hardware component；It can also will be considered as realizing the device of various functions, module, unit either real The software module of existing method can be the structure in hardware component again.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase Mutually combination.

Claims (10)

1. a kind of broadband diversity synchronous method based on CAZAC sequence characterized by comprising
CAZAC sequence determines step: determining required CAZAC sequence；
Broadband diversity synchronizes determining step: according to determining CAZAC sequence, obtaining sync bit by the synchronous operation of broadband diversity It sets.
2. the broadband diversity synchronous method according to claim 1 based on CAZAC sequence, which is characterized in that the CAZAC Sequence akDetermination method include:
Wherein, k=0,1 ..., N-1；N is sequence length；R is any positive integer relatively prime with N；E is；J is.
3. the broadband diversity synchronous method according to claim 1 based on CAZAC sequence, which is characterized in that the broadband Diversity synchronizes determining step
Computing cross-correlation sub-step: mobile recurrence read group total is carried out according to signal energy is received, and to the energy after recurrence summation Magnitude is averaging again, calculates threshold value；
Enhanced diversity operation sub-step: the energy value obtained to mobile recurrence read group total is divided into n diversity, to each diversity Middle energy value carries out computing cross-correlation, obtains the gross energy of each diversity, and carry out summation operation to all diversity gross energies；
Normalization operation sub-step: the gross energy of resulting each diversity and all diversity gross energies are normalized, will be returned One result changed is compared with the threshold value, obtains synchronous position.
4. the broadband diversity synchronous method according to claim 3 based on CAZAC sequence, which is characterized in that the movement Recurrence read group total includes:
mn+1=mn+|rn+1|2-|rn-L+1|2
Wherein,rn=sn+ωn；
rnTo receive signal, ωnFor noise, snFor signal, mnFor receive signal energy length of window L under accumulation and, CnFor CAZAC sequence, C* nFor sequence CnConjugation.
5. the broadband diversity synchronous method according to claim 4 based on CAZAC sequence, which is characterized in that normalized As a result DnAre as follows:
Dn=| Bn|2/|An|2；
Wherein, BnFor the gross energy of all diversity, AnFor the gross energy of each diversity.
6. a kind of broadband diversity synchronization system based on CAZAC sequence characterized by comprising
CAZAC sequence determining module: required CAZAC sequence is determined；
Broadband diversity synchronizes determining module: according to determining CAZAC sequence, obtaining sync bit by the synchronous operation of broadband diversity It sets.
7. the broadband diversity synchronization system according to claim 6 based on CAZAC sequence, which is characterized in that the CAZAC Sequence CkDetermination method include:
Wherein, k=0,1 ..., N-1；N is sequence length；R is any positive integer relatively prime with N；E is；J is.
8. the broadband diversity synchronization system according to claim 6 based on CAZAC sequence, which is characterized in that the broadband Diversity synchronizes determining module
Computing cross-correlation submodule: mobile recurrence read group total is carried out according to signal energy is received, and to the energy after recurrence summation Magnitude is averaging again, calculates threshold value；
Enhanced diversity operation submodule: the energy value obtained to mobile recurrence read group total is divided into n diversity, to each diversity Middle energy value carries out computing cross-correlation, obtains the gross energy of each diversity, and carry out summation operation to all diversity gross energies；
Normalization operation submodule: the gross energy of resulting each diversity and all diversity gross energies are normalized, will be returned One result changed is compared with the threshold value, obtains synchronous position.
9. the broadband diversity synchronization system according to claim 8 based on CAZAC sequence, which is characterized in that the movement Recurrence read group total includes:
mn+1=mn+|rn+1|2-|rn-L+1|2
Wherein,rn=sn+ωn；
rnTo receive signal, ωnFor noise, snFor signal, mnFor receive signal energy length of window L under accumulation and, CnFor CAZAC sequence, C* nFor sequence CnConjugation.
10. the broadband diversity synchronization system according to claim 9 based on CAZAC sequence, which is characterized in that normalized As a result DnAre as follows:
Dn=| Bn|2/|An|2；
Wherein, BnFor the gross energy of all diversity, AnFor the gross energy of each diversity.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101039499A (en) * 2006-03-13 2007-09-19 上海无线通信研究中心 CAZAC sequence-based cell searching structure of multi-carrier communication and searching method thereof
US20080267137A1 (en) * 2007-04-24 2008-10-30 Texas Instruments Incorporated Computer generated sequences for downlink and uplink signals in wireless communication systems
CN103188196A (en) * 2011-12-31 2013-07-03 中国电子科技集团公司第五十研究所 Synchronized method of orthogonal frequency division multiplexing system
CN103532898A (en) * 2013-04-22 2014-01-22 上海数字电视国家工程研究中心有限公司 OFDM training symbol generation and synchronization method based on CAZAC sequence

Non-Patent Citations (1)

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Title
B.N.ARDRA LEKSHMI,S.H.ASWINI,SUMA SEKHAR,SAKUNTALA S P: "Timing synchronization for MIMO-OFDM using orthogonal sequences in Rayleigh fading channel", 《2014 FIRST INTERNATIONAL CONFERENCE ON COMPUTATIONAL SYSTEMS AND COMMUNICATIONS (ICCSC)》 *

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