论文部分内容阅读
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 underwater acoustic multipath interference limits the further application of the underwater acoustic direct spread spectrum communication system. Selecting the better spreading sequence can improve the anti-jamming performance of the underwater acoustic spectrum spreading system. After discussing the characteristics of LS codes, this paper proposes the application of LS codes to underwater direct spread spectrum communication and analyzes the advantages of LS codes. Through the simulation of multipath Rayleigh underwater acoustic channel model, the good performance of LS code underwater acoustic spread spectrum communication is verified. The quadratic spectrum and singular value decomposition are used to estimate the spreading sequence of the LS code waterborne DSSS signals. The simulation results show that this method can accurately estimate the LS code when SNR is -11 dB.