LS码在水声扩频中的应用及估计  

Application and Estimation of LS Code in Underwater Acoustic Spread-spectrum Communication

作　　者：张帅[1] 高勇[1] 

机构地区：[1]四川大学电子信息学院,四川成都610065

出　　处：《通信技术》2013年第11期20-24,共5页Communications Technology

摘　　要：水声多径干扰限制了水声直接扩频通信系统的进一步应用,选取性能更好的扩频序列可以提高水声扩频系统的抗干扰性能。在讨论了LS码特性的基础上,提出了将LS码应用于水声直接扩频通信中,并分析了LS码应用的优势。通过多径瑞利水声信道模型仿真,验证了LS码水声扩频通信的良好性能。利用了二次谱和奇异值分解的方法对LS码水声直扩信号的扩频序列进行了估计。仿真结果表明,该方法在信噪比为-11 dB时还能准确的估计出LS码。The further application of underwater acoustic spread-spectrum communication system is limited by multipath interference, so the choice of spread spectrum sequences with better performances can im- prove the anti-jamming performances of underwater acoustic spread spectrum system. Based on discussion of LS code properties, LS codes is proposed for underwater acoustic spread- spectrum communication , and the superiority of its application also analyzed in this paper. Simulation on rayleigh channel model of un- derwater acoustic indicates good performances of the spread-spectrum communication based on LS code. With power- spectrum processing and singular value decomposition, the spread spectrum sequence of un- derwater acoustic spread-spectrum signal based on LS code is estimated. The simulation results shows that with this method,the LS code can be estimated correctly in the condition of SNR =- 11 dB.

关 键 词：LS码 水声直扩 瑞利水声信道模型 LS码估计 

分 类 号：TN911[电子电信—通信与信息系统]