摘要
Ｄ Ｓ Ｓ Ｓ 扩频技术能提高 Ｄ Ｓ Ｓ Ｓ 扩频系统的信号检测能力和抗干扰性能．本文将 Ｄ Ｓ Ｓ Ｓ 扩频技术引入非 Ｄ Ｓ Ｓ Ｓ 扩频系统， 提出了将独特码序列成组重复发送，并通过解扩频来检测独特码序列的方法， 分析了瑞利衰落信道下，采用新方法进行一次检测、多次检测和多次累积后期检验的检测性能， 给出了解析表达式并进行了仿真验证．分析表明， 该方法使系统同步性能有了很大改善；若采用多次累积后期检验的检测方法， 系统的帧同步性能还能进一步提高．
DSSS technique improves the signal detectability of the DSSS system. By introducing such technique into non DSSS system, this paper proposes a new method that sending the signature code in groups repeatedly, performing frame synchronization by de spread spectrum detection. The detectability of the frame synchronization codes in such a system is analyzed under Rayleigh fading channel, using once detection, major decision detection and accumulation posterior detection methodes. The analysis shows that great improvement can be obtained and, better performance can be given by accumulation posterior detection method.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
1999年第5期31-35,共5页
Journal of Southeast University：Natural Science Edition
关键词
帧同步
独特码
多次检测
后期检验
扩频通信
frame synchronization
signature code
major decision detection
accumulation posterior detection
