Energy-Efficient Path Selection Using SNR Correlation for Wireless Multi-Hop Cooperative Communications

In-Ho Lee and Haejoon Jung
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In-Ho Lee: Department of Electrical, Electronic and Control Engineering, Hankyong National University, Anseong 17579, Korea
Haejoon Jung: Department of Information and Telecommunication Engineering, Incheon National University, Incheon 22012, Korea

Energies, 2018, vol. 11, issue 11, 1-17

Abstract: In this paper, we consider partial path selection (PPS) for a multi-hop decode-and-forward cooperative system with limited channel state information (CSI) feedback, where the PPS utilizes local CSI only for a subset of hops on each of all independent paths between a source and a destination to reduce the energy consumption for CSI feedback. To enhance the end-to-end performance of the PPS, we propose a novel PPS method with local CSI chosen by the correlation between the end-to-end signal-to-noise ratios (SNRs) based on global and local CSI under Nakagami- m fading channels. For each path, we pick a subset of hops to report CSI with the highest correlation for a given CSI feedback overhead requirement, which can achieve the similar end-to-end outage probability to the best path selection with global CSI. We provide an exact and closed-form expression for the SNR correlation coefficient and present an impact of the SNR correlation on the end-to-end outage probability.

Keywords: multi-hop decode-and-forward relaying; limited channel feedback; SNR correlation; relay selection; Nakagami fading channels (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
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