Time reversal MFSK acoustic communication in underwater channel with large multipath spread

被引:21
作者
Cao, Xiu-ling [1 ]
Jiang, Wei-hua [1 ]
Tong, F. [1 ]
机构
[1] Xiamen Univ, Key Lab Underwater Acoust Commun & Marine Informa, Minister Educ, Xiamen, Peoples R China
关键词
Multipath; ISI; Down-conversion; Time reversal; MFSK; PASSIVE-PHASE-CONJUGATION; EXPERIMENT KAUAIEX; SPARSE CHANNELS; PERFORMANCE;
D O I
10.1016/j.oceaneng.2018.01.035
中图分类号
U6 [水路运输]; P75 [海洋工程];
学科分类号
0814 ; 081505 ; 0824 ; 082401 ;
摘要
It has been recognized that, compared with coherent acoustic communication, Multiple Frequency Shift Keying (MFSK) underwater acoustic communication offers the advantages of low complexity, easy-implementation and channel tolerance, but it is subject to significant performance degradation caused by inter-symbol interference (IS!) when the multipath spread is larger than symbol duration. The time reversal is capable of effectively suppressing the channel multipath by the means of temporal-spatial focusing, which has been widely examined and applied in coherent underwater acoustic communication systems. However, there is a lack of investigations to incorporate the time reversal with MFSK communication. In this paper, we report a multi-channel time reversal MFSK receiver, in which the channel estimate is initially obtained and periodically updated by matched filtering of the sync preamble, meanwhile, down-conversion is adopted to reduce computational complexity. The performance of the proposed receiver is evaluated in a shallow water channel with severe multipath spread, in terms of bit error rate (BER) and robustness upon time variations.
引用
收藏
页码:203 / 209
页数:7
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