多径衰落信道中导引辅助二维扩频的导引功率优化  

Analysis and Optimization of Pilot Symbol Assisted Two Dimensional Spread Spectrum Systems in Multi-path Fading Channels

作　　者：邵士海[1] 唐友喜[1] 戚骥[1] 李少谦[1] 宋立军[1] 

机构地区：[1]电子科技大学通信抗干扰技术国家级重点实验室,成都610054

出　　处：《电子与信息学报》2006年第8期1373-1378,共6页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(60272009;60472045;60496313);教育部博士点基金(20020614001);国家"863"计划(2003AA12331006)资助课题

摘　　要：在多径衰落信道中,针对BPSK调制的广义二维扩频系统,该文分析了导引符号与数据符号的功率比对导引辅助相干解调的误码率性能的影响,在系统总的发射功率一定的条件下,优化了导引符号与数据符号的功率比。结果表明,分析结果与仿真结果相吻合,导引符号与数据符号功率比的最优值是由多径信道的信噪比、多普勒频移、多径时延、低通滤波器的特性等因素决定的。This paper investigates the bit error rate performance influence due to variation of the power of the pilots in pilot symbol assisted BPSK modulated general two-dimensional spread spectrum systems in Rayleigh fading propagation environments. Under the circumstance, that the system＇s total transmitting power is fixed, the pilot to data power ratio is optimized analytically. Simulation results accord with theoretical conclusions, both of which illuminate that the optimum pilot to data power ratio is determined by the parameters of multipath fading channels such as SNR, Doppler frequency and multipath delay. The characteristic of low pass filter also affects the optimum pilot to data power ratio.

关 键 词：二维扩频通信 导引符号辅助调制 导引符号与数据符号功率比 误码率 衰落信道 

分 类 号：TN914.42[电子电信—通信与信息系统]