Wireless-Powered Filter-and-Forward Relaying in Frequency-Selective Channels


IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E103-A   No.9   pp.1095-1102
Publication Date: 2020/09/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.2019EAP1150
Type of Manuscript: PAPER
Category: Communication Theory and Signals
wireless energy harvesting,  filter-and-forward relaying,  inter-symbol interference,  self-energy recycling,  full-duplex,  

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In this paper, we propose a filter-and-forward relay scheme with energy harvesting for single-carrier transmission in frequency-selective channels. The relay node harvests energy from both the source node transmit signal and its own transmit signal by self-energy recycling. The signal received by the relay node is filtered to suppress the inter-symbol interference and then forwarded to the destination node using the harvested energy. We consider a filter design method based on the signal-to-interference-plus-noise power ratio maximization, subject to a constraint that limits the relay transmit power. In addition, we provide a golden-section search based algorithm to optimize the power splitting ratio of the power splitting protocol. The simulation results show that filtering and self-energy recycling of the proposed scheme are effective in improving performance. It is also shown that the proposed scheme is useful even when only partial channel state information is available.