基于广义正弦调频信号的多用户M元扩频水声通信方法  

Multiuser M-ary spread spectrum modulation scheme for underwater acoustic communication based on GSFM signals

作　　者：朱莹莹 杨文捷 吴永胜 ZHU Yingying;YANG Wenjie;WU Yongsheng(Unit 92682,Zhanjiang 524000,China)

机构地区：[1]92682部队,广东湛江524000

出　　处：《应用科技》2024年第5期29-38,共10页Applied Science and Technology

摘　　要：针对多用户扩频水声通信中的强多址干扰导致解码性能不佳的问题,提出一种基于广义正弦调频(generalized sinusoidal frequency modulation,GSFM)信号的多用户M元扩频水声通信调制方案。GSFM信号可以通过改变参数和频率反射技术产生大量占据同一频带且彼此近似正交的波形,建立合适的优化模型可以从众多波形中优化得到所需数目的最佳波形构建正交波形集,解决M元码分多址(code division multiple access,CDMA)水声通信系统选码困难的问题。接收端采用复杂度较低的M元能量检测器(M-ary energy detector,MED)算法完成各用户的解码。仿真结果表明,该方案在保证较高频带利用率的同时可以较好地抑制多址干扰,验证了方案的有效性和鲁棒性。该方案为多用户扩频水声通信中的强多址干扰问题提供了有效解决方案,具有应用价值。In solve the problem of poor decoding performance caused by strong multi-access interference in multi-user spread spectrum underwater acoustic communication,a multi-user M-ary spread spectrum modulation scheme based on generalized sinusoidal frequency modulated(GSFM)signal is proposed.GSFM signal can generate a large number of waveforms occupying the same spectrum and approximately orthogonal to each other by changing parameters and frequency reflection.By establishing a suitable optimization model,the required number of optimal waveforms can be optimized from numerous waveforms to construct an orthogonal waveform set.The problem of code selection in M-ary code division multiple access(CDMA)underwater acoustic communication system is solved.The receiver uses the Mary energy detector(MED)algorithm with low complexity to complete the decoding of each user.Simulation result shows that the scheme can suppress multi-access interference well while ensuring high spectrum utilization,which verifies the effectiveness and robustness of the scheme.This scheme provides an effective solution to the problem of strong multiple access interference in multi-user spread spectrum underwater acoustic communication,and has application value.

关 键 词：水声通信 扩频通信 M元扩频 多用户 广义正弦调频 码分多址 M元能量检测器 波形优化 

分 类 号：TN929.3[电子电信—通信与信息系统]