A Fast Acquisition Method of Parallel Combined Spread Spectrum Communication System Based on Correlator Group

Abstract

The invention belongs to the technical field of spread spectrum communication, and relates to a rapid capturing method of a parallel combination spread spectrum communication system based on a correlator group. The rapid capturing method comprises the following steps: transmitting identical synchronous head spread spectrum sequences before parallel combination spread spectrum data are transmitted, wherein the length is L, the synchronous head spread spectrum sequences are specific sequences of M PN code sequences of the parallel combination spread spectrum system, and a first sequence is taken as a synchronous head spread spectrum sequence; multiplying the synchronous head information received at a receiving end with a local carrier wave fc; by using M correlators of the receiving end, respectively performing ring shift left or ring rotate right on the synchronous head spread spectrum sequences of an ith correlator according to interval code elements that d=[L / (M-1)+1], wherein [] means rounding numbers, and i is equal to 0, 1, ..., M-1, and the ith correlator displaces for 1*d code elements. According to the rapid capturing method, due to the correlator group, the synchronous head capturing time is greatly shortened, synchronous heads can be rapidly captured due to acceleration of the correlator group, special capturing synchronous head circuits are reduced, the average capturing time of the synchronous head is greatly shortened, the contradiction of the synchronous capturing efficiency and the complexity in parallel combination spread spectrum communication is effectively solved, the sequence resource is saved, the complexity of a parallel combination spread spectrum system is alleviated, and furthermore the correlator group is adopted to ensure that a relatively great amount of hardware circuits is not needed in judging ending of synchronous head frames.

Description

technical field [0001] The invention belongs to the technical field of spread spectrum communication, and relates to a fast acquisition method of a parallel combined spread spectrum communication system based on correlator groups. Background technique [0002] Wideband digital communication has increasingly high requirements for system synchronization acquisition. Parallel combined spread spectrum communication is an improved method of soft spread spectrum communication. It is a spread spectrum communication method with high communication efficiency, and inherits the advantages of conventional spread spectrum communication such as anti-jamming and anti-detection. The parallel combined spread spectrum communication method has been well received by scholars at home and abroad, and has been introduced in academic journals by domestic and foreign scholars. Compared with other communication systems, the parallel combined spread spectrum communication system has a lower transmiss...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the synchronous head of the traditional parallel combined spread spectrum communication system takes too long to capture, consumes more hardware resources and sequence resources, and is prone to false capture in the follow-up, and provides a correlation-based A Fast Acquisition Method for the Parallel Combined Spread Spectrum Communication System of Device Groups

Images