正交频分复用循环移位扩频水声通信  

OFDM cyclic shift keying spread spectrum underwater acoustic communication

作　　者：景连友[1] 何成兵[1] 黄建国[1] 张群飞[1] 韩晶[1] 

机构地区：[1]西北工业大学航海学院,陕西西安710072

出　　处：《系统工程与电子技术》2015年第1期185-190,共6页Systems Engineering and Electronics

基　　金：国家自然科学基金(61101102;61271415);西北工业大学基础研究基金(JC20120219)资助课题

摘　　要：针对常规直接序列扩频水声通信数据传输速率低及M元扩频水声通信接收机复杂度高的问题,提出了一种正交频分复用(orthogonal frequency division multiplexing,OFDM)技术和循环移位键控(cyclic shift keying,CSK)技术相结合的调制方式,该调制能很大程度地提高系统的带宽使用率。从理论上对该方法在高斯白噪声信道条件下的误码率进行了分析。同时,采用Chu序列作为扩频序列,通过理论推导得出其峰均功率比(peak to average power ratio,PAPR)的上限为3dB。利用实际湖试测量得到的多径信道模型,与DSSS-OFDM方法进行了误码率性能的分析比较。结果表明,新提出的方法具有很好的抗多径性能,且具有带宽利用率高、复杂度低的特点,适用于中、远程及多用户水声通信。Aiming at solving the problems of low data transmission rate of direct sequence spread spectrum underwater acoustic communication and high complexity of the receiver design of M-ary spread spectrum under-water acoustic communication,an orthogonal frequency division multiplexing cyclic shift keying spread spectrum （CSK-OFDM）method is proposed to improve bandwidth efficiency.The bit error rate performance is analyzed under the additive white Gaussian noise channel condition in theory.The peak to the average power ratio（PA-PR）of the CSK-OFDM system is theoretically proved to be upper bounded by 3 dB using Chu sequences as spreading codes.Further simulation comparison to DSSS-OFDM is provided with the multi-path channel model based on lake-trial data.Simulation results show that the CSK-OFDM method has excellent anti-multipath capa-bility,low complexity as well as high bandwidth efficiency.Consequently,the proposed method is suitable for long-range and multi-users underwater acoustic communication.

关 键 词：水声通信 循环移位扩频 正交频分复用 仿真研究 

分 类 号：TN929.3[电子电信—通信与信息系统]