Chip synchronization method by direct sequence spread spectrum based parallel dispreading

A direct sequence spread spectrum and chip technology, which is applied in the field of spread spectrum communication and high-speed transmission communication, can solve the problem of not being able to meet the needs of parallel despreading and synchronization, and achieve fast and convenient chip synchronization, and the calculation method is simple and efficient. Effect

Inactive Publication Date: 2013-01-02
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

Therefore, in the direct sequence spread spectrum communication system, the chip synchronization of parallel despreading needs to search ...

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  • Chip synchronization method by direct sequence spread spectrum based parallel dispreading
  • Chip synchronization method by direct sequence spread spectrum based parallel dispreading
  • Chip synchronization method by direct sequence spread spectrum based parallel dispreading

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation. This embodiment is carried out on the premise of the technical solution of the present invention, and the detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0025] Take D=4 in this embodiment, as figure 1 , 2 , shown in 3, the chip synchronization method of the parallel despreading of a kind of direct sequence spread spectrum of the present invention, its concrete steps are as follows:

[0026] (1) Extract the pseudo-random sequence S with a length of 1 generated by the sequence generator at a rate of 4 times, thereby obtaining 4 groups of pseudo-random code sequences:

[0027] S i =Dec| D (S), i=0,1,...,3;

[0028] Combining with single-channel or multi-channel AD analog-to-digital converters, the received signal Y with a lengt...

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Abstract

A chip synchronization method by direct sequence spread spectrum based parallel dispreading is completed by a parallel dispreading system based on the direct sequence spread spectrum. The parallel dispreading system comprises a computer, an AD (analog-to-digital converter), a correlator and a sequence generator. Received parallel data in each channel and pseudo-random code sequences in each group extracted according to set extraction rate are subjected to correlated traversal processing, and current chip offset is judged according to correlated peak values of processed results so that chip synchronization is achieved by means of adjustment. By the chip synchronization method, chip synchronization is achieved quickly and conveniently, a computing method is simple and efficient, and difficulty in synchronization by parallel dispreading in direct sequence spread spectrum communication is overcome.

Description

Technical field: [0001] The invention relates to the field of spread spectrum communication, in particular to a code chip synchronization method for parallel despreading by using pseudo-random sequences when the uplink of direct sequence spread spectrum has a large spread spectrum ratio. The invention is applicable to the communication field of high-speed transmission. Background technique: [0002] Spread spectrum communication was originally used in military communication. Because of its large capacity, high speed, easy signal concealment, strong confidentiality, strong anti-interference ability, etc., and can greatly improve spectrum utilization, it has great significance for modern communication. Appeal. One of the most widely used is the direct sequence spread spectrum technology. [0003] With the improvement of the spreading ratio of the spread spectrum communication system, parallel despreading has received more and more attention. Compared with the traditional se...

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Application Information

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IPC IPC(8): H04B1/7073
Inventor 杨华熊箭归琳刘勃马文峰
Owner SHANGHAI JIAO TONG UNIV
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