基于码相扩展的TTCM直序扩频系统研究  

Investigation of TTCM DS/SS System Based on Expanding Spread Spectrum Series Phase

作　　者：王京[1] 杨波[1] 王跃科[1] 

机构地区：[1]国防科技大学机电工程与自动化学院,湖南长沙410073

出　　处：《国防科技大学学报》2007年第1期86-90,共5页Journal of National University of Defense Technology

摘　　要：提出了一种基于码相扩展扩频信号集上的TTCM直接序列扩频系统方案,通过将Turbo编码与扩频映射相结合,使得信号之间的最小欧氏距离增加,从而在不增加发射功率、不减小信息速率、不改变调制方式的前提下提高了系统的误码率性能。仿真结果表明,基于码相扩展的TTCM直序扩频系统可以比单纯直序扩频多获得1-3dB的编码增益,同时对载波初相估计误差和相位噪声的敏感程度并不增加。A new TTCM direct series spread spectrum system scheme was put forward. It is based on the signal sets through expanding spread spectrum series phase. This scheme can increase the minimum Euclidean distance and improve the BER performance without any increase of the signal power, slowdown of the information speed or change of the modulation mode. The simulation results show that the proposed system can achieve 13dB coding gain more than the ordinary TCM system while increasing no sensitivity to initial phase error or the phase noise of the carrier wave.

关 键 词：直接序列扩频 TURBO码 码元判决 TCM 

分 类 号：TN911.22[电子电信—通信与信息系统]