Study Of Spread Spectrum Code Synchronization Technology

Spread Spectrum Communications is a cutting technology developing rapdly in the information systems, it used more and more widely in mobile communications, wireless data communications and other areas for its high performance in anti-jamming and security. The concept of Spread Spectrum Communications has ripened since the 1950's; it has made headway development but only in partial development for more than twenty years. The PCS Provide Opportunity for spread spectrum technology. There was a great upsurge for PCS In the early 90s based on CDMA. A best way for PCS'development continuously is that PCS share the spectrum with other user. Spread spectrum technology made it possible for greater spectrum sharing. As more and more crowded wireless band interference is also increased. The Direct Sequence (DS) spread spectrum communications is one of the most typical spread spectrum modes. Synchronization is the key technology and is main diretion of Spread Spectrum Communications.The key of study communications systems is ability to effectively and reliably work.Synchronization of spread spectrum sequence spread-spectrum sequences are divided into two aspects of the capture and tracking. Now studies on Long PN Code are mainly. The purpose is to complete the acquisition time to come up short, occupy FPGA resources is small, the sprwading code to capture a small jitter is necessary to capture algorithm. The 4G drives spread spectrum technology extending in the high-speed data communication. New Technology and Wireless Communication for Integrated is two directions for 4G. spread spectrum technology will go a long way in the two aspects.To describe an improve algorithm for rapid capture, at this base and add to an auxiliary circuit enhancing the performance of PN.Without changing the judgement level and reduce the false aiarm effectively. Thus increase the acquisition capability.On the basis of acquisition time and acquisition performance the paper introduced aided circuit whitch can realize an algorithm of Fast Acquisition. Sp-read-spctrum code synchronization technology has made great progress in recent years. This paper focuses on the capture and tracking under normal condition improved algorithm and the existence of Doppler shift under the code capture and tracking algorithm and performing the simulation by using Matlab.The result shows this method can shorten the acquisition time and lower false alarm probability.