摘要
针对采用码相位循环移位获得的M元扩频需要额外同步信息的问题,提出一种改进型扩频通信算法.该算法采用m序列及其倒序序列构成系统扩频码集;在同相支路上利用扩频码的码极性调制进行传输,同时在正交支路利用扩频码码相位调制,实现M元扩频.该算法利用2种扩频方式的自身特点可快速准确地获取载波相位信息,具有不需要额外提供同步资源的优势.仿真结果表明,该算法可有效提高系统资源的利用率.
An improved M-ary spread spectrum communication algorithm was proposed based on the problem that M-ary spread spectrum adopting code phase shift keying（CPSK） needs synchronization information.The scheme is easy to realize because all spread spectrum codes comes from one SS code and its reverse order sequence.The scheme adopts BPSK modulation based on polarity modulation of PN in in-phase branch,and CPSK modulation based on phase modulation of PN code in orthogonal branch.The system has the advantages which can achieve carrier synchronization accurately and fleetly,but rather offer additional synchronization resource.The simulation results demonstrate that the algorithm is effective in improving the utilization ratio of system resources.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2010年第7期1010-1013,1018,共5页
Journal of Shanghai Jiaotong University
基金
国家自然科学基金资助项目(60276028)
关键词
扩频通信
M元扩频
载波同步
spread spectrum communication
M-ary spread spectrum
carrier synchronization
