浅海水声信道下抗多径OCDM通信研究-《集美大学学报（自然科学版）》

文章信息/Info

Title:: Research on Anti-Multipath OCDM Communication in Shallow Water Acoustic Channel

作者:: 朱培斌1; 陈文1; 许肖梅2; (1.集美大学海洋信息工程学院，福建厦门 361021；2.厦门大学海洋与地球学院，福建厦门 361005）

Author(s):: ZHU Peibin1; CHEN Wen1; XU Xiaomei2; (1.School of Ocean Information Engineering,Jimei University,Xiamen 361021,China;2.College of Ocean and Earth Sciences,Xiamen University,Xiamen 361005,China)

Keywords:: shallow water acoustic channel; orthogonal chirp-division multiplexing; underwater acoustic communication; Rake receiver; anti-multipath

摘要:: 基于正交chirp复用技术，提出一种新的抗多径浅海水声通信方法(DP-Rake OCDM)。采用经调制的chirp信号，利用多径分集来提高鲁棒性，同时在接收端解调中加入基于数据分拣的Rake接收机，用多个时间窗分析数据帧来消除多径引起的载波间干扰，从而在短保护间隔时提高通信性能。与OCDM、OFDM、DP-Rake OFDM方案通过系统仿真进行性能比较，结果表明，在强多径条件下（时延扩展大于保护间隔），DP-Rake抗多径OCDM的BER floor可达到10-6，DP-Rake OFDM的BER floor为10-5，而OCDM和OFDM都只有10-3，仿真结果验证了该方案的可行性和抗多径性能的优越性。

Abstract:: This paper proposes a new anti-multipath shallow seawater acoustic communication method(DP-Rake OCDM) based on orthogonal chirp multiplexing.Orthogonal chirp multiplexing uses modulated chirp signals to improve robustness by taking advantage of multipath diversity.This method also adds a data pick Rake receiver to the demodulation at the receiver and uses multiple time windows to analyze the data frame to eliminate the ICI caused by multipath，thereby improving the communication performance when the guard interval is short.It describe the implementation and parameter selection of the shallow water anti-multipath OCDM system and compares its performance with the OFDM through system simulation.Under strong multipath conditions(the delay spread is greater than the guard interval)，the BER floor of the DPRake OCDM system can reach 10-6,while the BER floor of DP-Rake OFDM is 10-5,and BER floor of OCDM and OFDM are both only 10-3.The simulation results verify the feasibility of the scheme and the superiority of anti-multipath performance.