Relay Selection for Simultaneous Information Transmission and Wireless Energy Transfer: A Tradeoff Perspective

Michalopoulos DS, Suraweera HA, Schober R (2014)

Publication Language: English

Publication Type: Journal article

Publication year: 2014

Journal

IEEE Journal on Selected Areas in Communications Institute of Electrical and Electronics Engineers (IEEE)

Book Volume: 33

Pages Range: 1578 - 1594

Journal Issue: 8

DOI: 10.1109/JSAC.2015.2391771

Abstract

In certain applications, relay terminals can be employed to simultaneously deliver information and energy to a designated receiver and a set of radio frequency (RF) energy harvesters, respectively. In such scenarios, the relay that is preferable for information transmission does not necessarily coincide with the relay that is preferable for energy transfer, since the corresponding channels fade independently. Relay selection thus entails a tradeoff between the efficiency of the information transmission to the receiver and the amount of energy transferred to the energy harvesters. The study of this tradeoff is the subject on which this work mainly focuses. Specifically, we investigate the dependence of the ergodic capacity and the outage probability of the information transmission to the receiver on the amount of energy transferred to the RF energy harvesters. We propose a relay selection policy that yields the optimal tradeoff in a maximum capacity/minimum outage probability sense, for a given energy transfer constraint. We also propose two suboptimal relay selection methods that apply to scenarios with limited availability of channel state information. Additionally, we propose a suboptimal scheme which approximates the optimal scheme for the special case of two relays and facilitates performance analysis. Interesting insights on the aforementioned tradeoffs are unveiled.

Authors with CRIS profile

Robert Schober Lehrstuhl für Digitale Übertragung

Involved external institutions

University of British Columbia CA Canada (CA) University of Peradeniya LK Sri Lanka (LK)

How to cite

APA:

Michalopoulos, D.S., Suraweera, H.A., & Schober, R. (2014). Relay Selection for Simultaneous Information Transmission and Wireless Energy Transfer: A Tradeoff Perspective. IEEE Journal on Selected Areas in Communications, 33(8), 1578 - 1594. https://dx.doi.org/10.1109/JSAC.2015.2391771

MLA:

Michalopoulos, Diomidis S., Himal A. Suraweera, and Robert Schober. "Relay Selection for Simultaneous Information Transmission and Wireless Energy Transfer: A Tradeoff Perspective." IEEE Journal on Selected Areas in Communications 33.8 (2014): 1578 - 1594.

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