Orthogonal frequency-division multiplexing underwater acoustic communications with time reversal processing

2012 ◽  
Vol 131 (4) ◽  
pp. 3238-3238
Author(s):  
Xingyang Nie ◽  
Wen Xu
Keyword(s):  
Time Reversal ◽  
Orthogonal Frequency Division Multiplexing ◽  
Frequency Division Multiplexing ◽  
Underwater Acoustic Communications ◽  
Frequency Division ◽  
Acoustic Communications ◽  
Underwater Acoustic

OFDM Demodulation Using Virtual Time Reversal Processing in Underwater Acoustic Communications

2015 ◽  
Vol 23 (04) ◽  
pp. 1540011 ◽  
Author(s):  
Yanling Yin ◽  
Songzuo Liu ◽  
Gang Qiao ◽  
Yue Yang ◽  
Yue Yang
Keyword(s):  
Time Reversal ◽  
Orthogonal Frequency Division Multiplexing ◽  
Estimation Methods ◽  
Delay Spread ◽  
Underwater Acoustic Communications ◽  
Ofdm Systems ◽  
Acoustic Communications ◽  
Underwater Acoustic ◽  
Single Input Single Output ◽  
Virtual Time

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 (PS). However, the PS itself may introduce extra noise and interference (self-correlation of the PS). 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 PS to reduce the interference. Two sparse channel estimation methods, matching pursuit (MP), and basis pursuit denoising (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.

An OFDM System for Long-Range Underwater Acoustic Communications

2013 ◽  
Vol 321-324 ◽  
pp. 1274-1277 ◽  
Author(s):  
Xiao Lin Shi ◽  
Yi Xin Yang ◽  
Long Yang
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Data Stream ◽  
Underwater Acoustic Communications ◽  
Frequency Division ◽  
Ofdm System ◽  
Acoustic Communications ◽  
Underwater Acoustic ◽  
Frequency Domain Equalization ◽  
Convolutional Coding ◽  
Simulation Results

The Orthogonal Frequency Division Multiplexing (OFDM) technique is an effective method for suppressing multi-paths interference of underwater acoustic (UWA) channels. In this paper, a new communication system based on OFDM is presented, aiming at reliable 70km shallow water communications. The convolutional coding and frequency-domain equalization are also applied for the improvement of the OFDM system performance. The simulation results show that this proposed system can transmit data stream with low bit error rate (BER) in 70km UWA distance.

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