The Research For The Capture Of PCSS Communication System Based On Serial And Parallel Synchronous Head

Spread spectrum technology is the forefront of rapid development in modern digital communication technology,because of its strong anti-interference ability,low probability of intercept,strong confidentiality,strong multiple access channel,strong ability to adapt to channels and other characteristics,it is widely used in mobile communications,navigation,location and other fields.PCSS communication technology develops on the basis of soft spread spectrum communication technology,the inheritance of spread spectrum communication technology advantages of strong anti-interference,strong confidentiality,but also has high frequency efficiency,the advantages of high transmission rate,is suitable for the high rate of information spread spectrum communication applications,has a broad application prospect.In spread spectrum communication technology,the research of the spread spectrum pseudo code capture technology has been the emphasis and difficulty in spread spectrum communication research.Because of the complex of the PCSS system structure,the parallel combination of the spread spectrum communication combination PN code acquisition is much more complicated than the capture of the spread spectrum communication system,the capturing circuit is not easy to implement.And in capturing ruling cross-correlation interference with other sequence,influence the capture performance of the PCSS system.In this paper,in order to improve the capture performance,to reduce the capture circuit complexity,the structure characteristics of the play and enlarge receiver as the prerequisite,put forward the PCSS communication system based on parallel synchronous head and based on serial and parallel synchronous head.This paper mainly do the following:(1)Analyzed the PCSS communication technology and spread spectrum pseudo code capture technology and researched the traditional PCSS communication capture circuit structure of the algorithm,capture the computation.(2)Put forward PCSS communication system based on parallel synchronous head,and analysis the PCSS's principle and its capture algorithm principle system based on parallel synchronous head.In capture system introducing correlator capture structure,simulation analysis expansion system correlator quick capture to capture the performance of the algorithm based on parallel synchronous head.(3)Put forward PCSS communication system based on serial and parallel synchronous head,the analysis was based on string and synchronization of the head and expanding principle and the principle of the capture system.Simulation analysis the capture performance of the system based on the serial and parallel synchronous head,compared to the capture performance of the system based on the parallel synchronous head,and discussed the capture of algorithm which is suitable for PCSS system.Research show that the PCSS system which is based on parallel synchronous head greatly reduced the capture of processing,reduce the capture the complexity of the circuit compared to the traditional PCSS system.Capture the correlator group structure,make full use of the correlator in the receiver group,improve the performance of capture speed and capture.The weak condition judgment method to improve the reliability and stability of the PCSS system.The PCSS system adds serial synchronization head based on serial and parallel synchronous head,using the serial synchronization head realize the rapid guidance of capture and improve the capture performance of the system.