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Anti-Doppler frequency shift synchronization method based on pseudo-random sequence differential coding

A pseudo-random sequence, Doppler frequency shift technology, applied in the field of wireless communication, can solve problems such as inability to guarantee effective synchronization, performance degradation, correlation peak ambiguity, etc., to achieve resistance to Doppler frequency shift, accurate synchronization, and low complexity Effect

Active Publication Date: 2018-12-07
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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Problems solved by technology

[0011] The present invention aims at the problem that the existing guide-assisted synchronization technology is high-dynamic, that is, when a large Doppler frequency offset is generated at both ends of the transceiver, the correlation peak is blurred, the performance drops sharply, and the effective synchronization cannot be guaranteed, and further provides a method that can suppress strong A time and bit timing synchronization method based on guidance assistance based on Doppler frequency shift, which can be applied to single / multi-carrier digital communication systems

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  • Anti-Doppler frequency shift synchronization method based on pseudo-random sequence differential coding

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[0041] The specific implementation mode is described according to the accompanying drawings, and the generation of differentially coded pilot symbols, the simple centralized insertion frame structure and the synchronization processing process of the receiving end of the present invention are further described.

[0042] The sending end consists of m-sequence generator, differential encoding, polarity conversion and synchronous frame.

[0043] Flowchart such as figure 1 shown.

[0044] The m-sequence generator parameters adopted include the generator polynomial and the initial state (seed) of the shift register;

[0045] Select generator polynomials according to the m-sequence period length required by confidentiality, and set sequence generation seeds in combination with physical time information;

[0046] According to the set guide sequence length L, select the first L symbols output by the m-sequence generator:

[0047] m L =(m 1 ,m 2 ,...,m L ),m l ∈(0,1)

[0048] F...

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Abstract

The invention discloses an anti-Doppler frequency shift synchronization method based on pseudo-random sequence differential coding. The anti-Doppler frequency shift synchronization method can simultaneously realize time and bit timing synchronization in the case of strong Doppler frequency shift, is suitable for a single / multi-carrier system, and comprises the steps of: (1) performing differentialencoding on a pseudo-random sequence at a transmitting end, regarding the pseudo-random sequence after differential encoding as pilots, and maintaining autocorrelation property thereof; (2) performing de-differentiation processing on two orthogonal sampling signals before sliding correlation detection of the receiving end; (3) realizing correlation operation of received signals and local pilot symbols by means of filtering, comparing a correlation peak value output by a filter with a set threshold, and further determining a time synchronization moment; (4) and comparing a signal sequence extracted from different clock skew with a correlation peak of the local pilot, determining the optimal extraction clock, and realizing bit timing synchronization. The anti-Doppler frequency shift synchronization method adopts interceptive m sequences, suppresses the influence of Doppler frequency shift on synchronization through differential encoding, and can apply the pilot sequence to frequency offset and channel estimation, thereby laying a foundation for the subsequent frequency offset compensation and demodulation processing.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, in particular to an anti-Doppler frequency shift synchronization method based on pseudo-random sequence differential coding, including time and bit timing synchronization. Background technique [0002] Digital wireless communication has the advantages of strong anti-interference ability, error controllability and easy confidentiality, and has become a necessary way to support 0 and 1 bit data transmission in the information age. However, the reliable and effective transmission of digital communication must be based on strict synchronization between the two communication parties. Among them, time and bit timing synchronization are the most important, and the two are the key to realize the digital wireless communication system. [0003] Synchronization algorithms can be divided into two categories: data-assisted synchronization algorithms and non-data-assisted synchronization algorit...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06H04L27/26
CPCH04J3/0635H04L27/2655
Inventor 刘建成郝学坤王赛宇李勇任计林
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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