CN108494715A - A kind of primary synchronization signal catching method of lte-a system - Google Patents

A kind of primary synchronization signal catching method of lte-a system Download PDF

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Publication number
CN108494715A
CN108494715A CN201810084063.8A CN201810084063A CN108494715A CN 108494715 A CN108494715 A CN 108494715A CN 201810084063 A CN201810084063 A CN 201810084063A CN 108494715 A CN108494715 A CN 108494715A
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China
Prior art keywords
fft
data
lte
signal
synchronization signal
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CN201810084063.8A
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Inventor
陈发堂
李玉河
马昶
王华华
李小文
王丹
刘宇
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Chongqing University of Post and Telecommunications
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Chongqing University of Post and Telecommunications
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2647Arrangements specific to the receiver only
    • H04L27/2655Synchronisation arrangements
    • H04L27/2656Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

A kind of primary synchronization signal catching method of LTE A systems is claimed in the present invention.It is related to the correlation computations of synchronizing sequence in mobile communication system.Terminal needs, the i.e. capture and processing of synchronizing signal synchronous with the time into line frequency to received signal in mobile communication system.Frequency Synchronization mainly carries out Digital Down Convert operation to signal, and time synchronization mainly carries out sliding correlation by the synchronizing sequence for being from a locally generated baseband signal, to determine the initial position of synchronizing signal, to reach time synchronization.With the development of technology, high-speed, low delay character is presented in mobile communication system, and how quickly and accurately processing signal becomes the hot spot for research, the synchronous first step as mobile communication system, and synchronous efficiency directly determines the processing of follow-up signal with performance.Therefore, it herein by taking LTE A systems as an example, proposes that a kind of low complex degree based on FFT slides correlation technique, can significantly reduce the computation complexity in synchronizing process.

Description

A kind of primary synchronization signal catching method of lte-a system
Technical field
The invention belongs to the treatment technologies of the primary synchronization signal of LTE-A technical fields more particularly to lte-a system.
Background technology
Auto-correlation and cross-correlation statistics communicate and Digital Signal Processing in it is all particularly significant.In Digital Signal Processing, profit The similarity degree of two signals is described with related.In communication system, in order to accurately find out the spy that base station is sent out in specific position Different sequence, generally use related algorithm is related to sequence progress is received by local tectonic sequence, so that it is determined that running time-frequency resource position It sets.Therefore to the research important in inhibiting of related algorithm.
LTE-A is the evolution version of LTE, and the systematic parameter of LTE-A improves a lot compared with LTE, and can carry Power system capacity for bigger and lower Time Delay of Systems.With the performance boost of LTE-A, become after 3G in the world Mainstream mobile communication standard of new generation.It carries out cell searching in lte-a system after starting up of terminal first, finds terminal region Interior cell, line frequency of going forward side by side are synchronous with the time.After in terminal and cell synchronous, the reception processing of follow-up signal could be carried out, Therefore synchronization is most important in lte-a system.
In lte-a system, primary synchronization signal uses Zadoff-Chu (ZC) sequence.Primary synchronization signal in TD-LTE system PSS is mapped to the third OFDM symbol of subframe 1 and subframe 6, as long as therefore terminal can calculate the initial positions PSS just can half Frame synchronization, the position that secondary synchronization signal SSS is found secondly by the position and CP types of PSS carry out frame synchronization closer to a step, To achieve the effect that time synchronization, therefore it is most important accurately to find the positions PSS.Existing PSS related algorithms, mainly when It is related that domain carries out sliding, but its computationally intensive does not meet the following green communications theory, it is therefore desirable to which the related of more low complex degree is calculated Method synchronizes calculating.
Invention content
Present invention seek to address that the above problem of the prior art.Propose a kind of master for the lte-a system reducing complexity Synchronizing signal catching method.Technical scheme is as follows:
A kind of primary synchronization signal catching method of lte-a system comprising following steps:
Step 1:Signal r (t) will be received and be divided into n segment datas, every section of length is k, k { { r (1), r (2) ..., r (k) } ..., r (nk+1), r (nk+2) ..., r ((n+1) k) }, wherein n=0,1,2 ...;
Step 2:Adjacent two segment data that step 1 is divided equally, which is spliced, to be merged, and then carrying out N points FFT, (fast Fourier becomes Change) operation;Wherein N indicates to carry out the points of FFT;
Step 3:Main synchronizing sequence is divided into the data that every segment length is k, and FFT is carried out to every segment data, then is taken altogether Yoke;
Step 4:Data of the sequence after step 2 FFT and the data corresponding points phase after local sequence FFT will be received Multiply, obtains the median of correlated results;
Step 5:Result in step 4 is carried out relevant portion median to add up, is then N point IFFT again, it is final to protect K point before staying, as correlated results;
Step 6:Aforesaid operations are repeated, until correlation terminates, primary synchronization signal is obtained and terminates.
Further, local sequence is divided into the data that every segment length is k by the step 3, and is carried out to every segment data FFT, then conjugation is taken, specifically include step:Pass throughFFT behaviour is carried out to receiving data Make.
Further, the step 4:Data a+bi of the sequence after step 2 FFT and local sequence FFT will be received Data c+di corresponding points afterwards are multiplied, and obtain the median of correlated results, specifically include step:
The real part of correlated results median is ac-bd, imaginary part ad+bc.
Further, the step 5 adds up the result progress relevant portion median in step 4, then does N points again IFFT, it is final to retain preceding k point, as correlated results, specifically include step:
1. passing through formulaCarry out IFFT operations
2. k point is as correlated results before the result of IFFT is retained
It advantages of the present invention and has the beneficial effect that:
The method of the present invention present invention will be slided on correlating transforms to frequency domain and be carried out, and with circumference correlation theorem knowledge, be utilized Circumference correlation replaces linear correlation, significantly reduces sliding correlation computations amount.Meanwhile the present invention is segmented sequence is received again The mode of adjacent merging can reduce the consumption of resource during realization.Major calculations amount of the present invention concentrates on FFT and IFFT In the process, the FFT operation calculation amounts of N points are:Complex addition number is Nlog2N, complex multiplication number areTherefore It is ο (Nlog to be derived from correlation value calculation complexity of the present invention2N), traditional time domain sliding correlation calculation complexity is ο (Nk), k counts for correlation value calculation.As can be seen that with the increase of associated numbers of times, calculation amount of the invention significantly reduces.
Description of the drawings
Fig. 1 is that the present invention provides the relevant structure diagram of preferred embodiment conventional slip;
Fig. 2 is the structure diagram of the present invention;
Fig. 3 is that the present invention carries out correlated results analogous diagram to 4 frame data.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, detailed Carefully describe.Described embodiment is only a part of the embodiment of the present invention.
Traditional sliding correlation method finds out sliding by comparing by the way that baseband signal and local PSS are carried out relevant operation The maximum value of correlated results, so that it is determined thatAnd the position of PSS, specific implementation are as shown in Figure 1.Although the program walks It is rapid simple, but computation complexity and the linear growth of associated numbers of times, implementation complexity are still higher.
By taking lte-a system as an example, it is described as follows in conjunction with Fig. 2 and way of example:
Step 1:Signal r (t) will be received and carry out the segment processing that length is 1024, baseband signal is divided into many sections 1024 data.
Step 2:Data in step 1 are subjected to contiguous concatenation merging, i.e., 1,2 section of splicing, 2,3 sections of splicings, 3,4 spell It connects, and so on.
Step 3:The every segment data spliced in step 2 is carried out 2048 point FFT to operate after obtaining baseband signal segmentation Frequency-domain expression.
Step 4:Local synchronization sequence is divided into the data that 2 segment length are 1024,2048 point FFT will be carried out per segment data Processing, then takes conjugation to obtain the segment frequence expression formula of local synchronization sequence.
Step 5:Step 3 is multiplied with step 4 acquired results corresponding points, obtains the median of correlated results.
Step 6:When calculating the related median of two sections and the above splicing result, by adjacent median related twice It is added, then carries out step 7.Otherwise step 3 is carried out.
Step 7:It will add up result and carry out 2048 point IFFT, and it is correlated results to retain preceding 1024 values.It repeats above-mentioned Step, until calculating 153600 point (field) correlations.
Fig. 3 is that the present invention carries out correlated results analogous diagram to 4 frame data, and dotted line indicates half frame boundaries in figure, according to main same It includes synchronizing signal to walk each half frame data known to the time-domain position of signal.Within the scope of each field, find out by comparing most The peak value of big relevant peaks, position, so that it is determined that interior number of cell groupMaximum correlation peak in each field of coordinate representation in figure Peak value and position.
The above embodiment is interpreted as being merely to illustrate the present invention rather than limit the scope of the invention. After the content for having read the record of the present invention, technical staff can make various changes or modifications the present invention, these equivalent changes Change and modification equally falls into the scope of the claims in the present invention.

Claims (4)

1. a kind of primary synchronization signal catching method of lte-a system, which is characterized in that include the following steps:
Step 1:Signal r (t) will be received and be divided into n segment datas, every section of length is k, k { { r (1), r (2) ..., r (k) } ..., r (nk+1), r (nk+2) ..., r ((n+1) k) }, wherein n=0,1,2 ...;
Step 2:Adjacent two segment data that step 1 is divided equally, which is spliced, to be merged, and N point FFT Fast Fourier Transform (FFT)s behaviour is then carried out Make;Wherein N indicates to carry out the points of FFT;
Step 3:Main synchronizing sequence is divided into the data that every segment length is k, and FFT is carried out to every segment data, then takes conjugation;
Step 4:Data of the sequence after step 2 FFT will be received to be multiplied with the data corresponding points after local sequence FFT, obtained To the median of correlated results;
Step 5:Result in step 4 is carried out relevant portion median to add up, is then N point IFFT again, it is final to retain preceding k It is a, as correlated results;
Step 6:Aforesaid operations are repeated, until correlation terminates, primary synchronization signal is obtained and terminates.
2. a kind of primary synchronization signal catching method of lte-a system according to claim 1, which is characterized in that the step Rapid three are divided into local sequence the data that every segment length is k, and carry out FFT to every segment data, then take conjugation, specifically include step Suddenly:Pass throughFFT operations are carried out to receiving data.
3. a kind of primary synchronization signal catching method of lte-a system according to claim 1, which is characterized in that the step Rapid four:Data a+bi of the sequence after step 2 FFT will be received to be multiplied with the data c+di corresponding points after local sequence FFT, The median of correlated results is obtained, step is specifically included:
The real part of median is ac-bd, imaginary part ad+bc.
4. a kind of primary synchronization signal catching method of lte-a system according to claim 1, which is characterized in that the step Result in step 4 is carried out relevant portion median by rapid five to add up, and is then N point IFFT again, final to retain preceding k point, i.e., For correlated results, step is specifically included:
1. passing through formulaCarry out IFFT operations;
2. k point is as correlated results before the result of IFFT is retained.
CN201810084063.8A 2018-01-29 2018-01-29 A kind of primary synchronization signal catching method of lte-a system Pending CN108494715A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111224908A (en) * 2018-11-26 2020-06-02 展讯通信(上海)有限公司 Signal sequence detection method and device, storage medium and terminal

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CN101699774A (en) * 2009-11-10 2010-04-28 京信通信系统(中国)有限公司 Downstream synchronic PN sequence capturing method for CDMA 2000 1x system
CN102026231A (en) * 2010-12-14 2011-04-20 中国科学院声学研究所 Method for detecting random access of wireless communication system
US20140086266A1 (en) * 2012-09-26 2014-03-27 Metanoia Communications Inc. LTE-Advanced Primary Synchronization Signal Detection
CN105553507A (en) * 2015-12-22 2016-05-04 北京理工大学 Full coherence accumulation time-frequency domain parallel capturing method based on FFT

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101699774A (en) * 2009-11-10 2010-04-28 京信通信系统(中国)有限公司 Downstream synchronic PN sequence capturing method for CDMA 2000 1x system
CN102026231A (en) * 2010-12-14 2011-04-20 中国科学院声学研究所 Method for detecting random access of wireless communication system
US20140086266A1 (en) * 2012-09-26 2014-03-27 Metanoia Communications Inc. LTE-Advanced Primary Synchronization Signal Detection
CN105553507A (en) * 2015-12-22 2016-05-04 北京理工大学 Full coherence accumulation time-frequency domain parallel capturing method based on FFT

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111224908A (en) * 2018-11-26 2020-06-02 展讯通信(上海)有限公司 Signal sequence detection method and device, storage medium and terminal

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