CDMA通信中扩频解扩技术分析  

Analysis of Spread and De-spread Spectrum Technology in CDMA Communication

作　　者：李雪华[1] 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《无线电通信技术》2011年第3期30-32,64,共4页Radio Communications Technology

摘　　要：扩频通信具有抗干扰、抗衰落以及抗侦察等特点,并且可以实现码分多址(CDMA)。简要介绍了CDMA的通信体制,针对CDMA中扩频解扩这一关键技术进行了分析,阐述了扩频处理中的信息加扰及码元变换的必要性、扩频码的选取原则和实现方法,重点介绍了数字化解扩处理的实现方法,并对数字化解扩中搜索、捕获、初步跟踪、精确跟踪和解扩5个阶段进行了分析,最终实现数字化解调。Spread spectrum communication has characteristics of anti-interference,anti-fading and counter reconnaissance,and it can implement code division multiple access（CDMA）.The CDMA communication system is introduced briefly.The critical technology in CDMA communication,namely the spread and de-spread spectrum technology is analyzed,and the necessity of scrambling and code transformation in spread spectrum process as well as the selection rule and implementation method of spread spectrum code is expatiated.Emphases are put on the implementation methods of digital de-spread spectrum process.In digital de-spread spectrum process,five stages of the process are analyzed including searching,capturing,initial tracking,accurate tracking and de-spread spectrum,and digital demodulation is implemented.

关 键 词：扩频通信 CDMA 扩频调制 解扩解调 

分 类 号：TN929.5[电子电信—通信与信息系统]