具有超长延迟传播的深水水声信道OFDM

Zhaohui Wang, Shengli Zhou, J. Catipovic, Jie Huang
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引用次数: 7

摘要

深水水平水道通常比浅水水道具有很长的延迟扩展。延迟扩展可达数百毫秒,覆盖了正交频分复用(OFDM)传输的多个块,导致严重的块间干扰(IBI)。通常有两个重要的分离良好的星团,一个来自直接路径,另一个来自表面反射。将沿两个集群到达的信号视为来自两个虚拟用户,我们开发了一个基于多用户的OFDM接收器来解决IBI,其中提出了信道估计和数据检测算法。该接收机可以有效地组合来自多个具有不同延迟扩展结构的传感器的信号,其中每个块在多个不同块的干扰下进行解码。来自大西洋海底测试和评估中心(AUTEC)环境的实验数据用于验证所提出的接收机的性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
OFDM in deep water acoustic channels with extremely long delay spread
Deep water horizontal channels usually have very long delay spreads relative to shallow water channels. The delay spread can be several hundreds of milliseconds, which covers several blocks of orthogonal frequency division multiplexing (OFDM) transmissions, leading to severe inter-block-interference (IBI). There are usually two significant well-separated clusters, one from direct paths and the other from surface reflections. Viewing the signals arrived along the two clusters as from two virtual users, we develop a multiuser based OFDM receiver to address IBI, where both channel estimation and data detection algorithms are presented. This receiver can effectively combine signals from multiple senors with different delay spread structures, where each block is decoded in the presence of interference from multiple different blocks. Experimental data from the Atlantic Undersea Test and Evaluation Center (AUTEC) environment are used to validate the performance of the proposed receiver.
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