Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093-0238, USA.
J Acoust Soc Am. 2011 Oct;130(4):EL161-6. doi: 10.1121/1.3629138.
Recently time reversal (TR) communications has been extended to time-varying channels. The basic idea is to implement it on a block-by-block basis such that within each block the channel remains time-invariant and subsequently is updated using detected symbols (decision-directed mode). Using experimental data (12-20 kHz) collected in shallow water, this letter investigates three different block-based TR approaches: (1) without explicit phase tracking, (2) with phase tracking, and (3) exploiting channel sparsity. The TR approaches then are compared to a conventional adaptive multichannel equalizer. It is found that approach (3) generally provides the best performance and robustness.
最近，时反（TR）通信已扩展到时变信道。其基本思想是在逐块的基础上实现它，使得在每个块内信道保持时不变，然后使用检测到的符号进行更新（判决导向模式）。使用在浅水中收集的实验数据（12-20 kHz），本信研究了三种不同的基于块的 TR 方法：（1）无显式相位跟踪，（2）相位跟踪，和（3）利用信道稀疏性。然后将 TR 方法与传统的自适应多通道均衡器进行比较。结果表明，方法（3）通常提供最佳的性能和鲁棒性。
