水声通信系统基于分布式的导频放置

针对基于正交频分复用水声通信系统的频率选择性信道，传统的导频放置方式不能获取较好的信道估计性能，本文提出了一种分布式导频放置方式，该方法通过设定相邻导频符号的间距大于信道相关带宽，从而来减小信道的频率响应波谷对信道估计性能的影响。仿真结果表明：本文提出的分布式导频放置方式较传统的等间距和集中式导频放置方式具有更优的性能。

Distributed Pilot Pattern for Underwater Acoustic Communication System

In frequency-selective underwater acoustic channel based on orthogonal frequency division multiplexing (OFDM), conventional pilot pattern cannot achieve a better channel estimation performance. To avoid this poor situation, we proposed a random distributed pilot pattern, this pattern effectively reduces the frequency selective fading impact by placing pilot symbols such that distance between any two adjacent pilot symbol being larger than or equal to coherent bandwidth. From our simulation results, we find : the proposed distributed pilot pattern has a better bit error rate performance compared to conventional equi-spaced and consecutive patterns.