UACE2017 Proceedings: PLNC using a multichannel DFE receiver at the relay for shallow-water acoustic communications

Session:
Underwater Communications and Networking
Paper:
PLNC using a multichannel DFE receiver at the relay for shallow-water acoustic communications
Author(s):
Alaa Ahmed, Charalampos Tsimenidis, Jeffrey Neasham
Abstract:
Two-way relay networks typically require three time slots to complete an end-to-end packet exchange. In contrast, utilizing physical layer network coding (PLNC) in such systems results in a capacity improvement since only two time slots are required for the same information exchange. However, using PLNC in underwater acoustic networks poses a challenge due to the frequency-selective nature of the underlying channels. In this paper, we propose a denoise-and-forward (DNF) approach at the relay in conjunction with a linear antenna array and a pair of optimum decision-feedback equalizers to compensate for the channel dispersion. Simulation results show that for a relatively small number of antennas, the bit error rate performance is almost identical to that of a point-to-point frequency-selective channel system with one DFE equalizer and outperforms in orthogonal frequency division multiplexing (OFDM) PLNC based systems under the same channel conditions.
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