OFDM demodulation using virtual time reversal processing in underwater acoustic communication
OFDM demodulation using virtual time reversal processing in underwater acoustic communication
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DOI：
10.1142/s0218396x15400111
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发表时间：
2015-12
期刊：
影响因子：
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通讯作者：
Yanling Yin;Songzuo Liu;Gang Qiao;Yue Yang
中科院分区：
文献类型：
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作者：
Yanling Yin;Songzuo Liu;Gang Qiao;Yue Yang
超长的水下信道时延扩展会导致水声通信中严重的码间干扰。被动时间反转处理（PTRP）通过将接收到的数据包与时间反转的探测信号进行卷积，可以有效地降低信道的时间色散。然而，探测信号本身可能引入额外的噪声和干扰（探测信号的自相关）。本文提出了一种适用于单输入单输出（SISO）正交频分复用（OFDM）系统的虚拟时间反转处理（VTRP）。它将接收到的数据包与反向估计的信道进行卷积，而不是与探测信号进行卷积，以减少干扰。采用匹配追踪（MP）和基追踪去噪（BPDN）两种稀疏信道估计方法估计信道冲激响应（CIR）。通过MATLAB仿真和水池实验，我们比较了VTRP和PTRP以及没有任何时间反转处理的性能。结果表明，VTRP在时不变信道下具有优异的性能。
The extremely long underwater channel delay spread causes severe inter-symbol interference (ISI) for underwater acoustic communications. Passive time reversal processing (PTRP) can effectively reduce the channel time dispersion in a simple way via convolving the received packet with a time reversed probe signal. However the probe signal itself may introduce extra noise and interference (self-correlation of the probe signal). In this paper, we propose a virtual time reversal processing (VTRP) for single input single output (SISO) Orthogonal Frequency Division Multiplexing (OFDM) systems. It convolves the received packet with the reversed estimated channel, instead of the probe signal to reduce the interference. Two sparse channel estimation methods, matching pursuit (MP), and basis pursuit de-noising (BPDN), are adopted to estimate the channel impulse response (CIR). We compare the performance of VTRP with the PTRP and without any time reversal processing through MATLAB simulations and the pool experiments. The results reveal that VTRP has outstanding performance over time-invariant channels.