Abstract
This paper investigates the performance of an energy-harvesting (EH) relay network, where multiple sources communicate with a destination via multiple EH decode-and-forward (DF) relays. The EH relays all equip with a power splitter to divide the received signal power into two parts, which are used for signal processing and information forwarding, respectively. The power splitting ratio depicts the trade-off between the relaying energy and decoding energy. We propose an optimal power splitting and joint source-relay selection (OPS-JSRS) scheme where the optimal power-splitting ratio is obtained and the best source-relay pair is selected to transmit the message. For the purpose of comparison, we present the optimal power splitting and round-robin (OPS-RR) and the traditional power splitting and joint source-relay selection (TPS-JSRS) schemes. The exact and asymptotic closed-form expressions of outage probability for OPS-RR, TPS-JSRS and OPS-JSRS schemes are derived over Rayleigh fading channels . Numerical results show that the outage probability of OPS-JSRS scheme is lower than that of OPS-RR and TPS-JSRS schemes, explaining that the proposed OPS-JSRS scheme outperforms TPS-JSRS and OPS-RR schemes. Additionally, the outage probability performance of OPS-JSRS scheme can be improved by increasing the number of sources and/or relays.
Highlights
R Ecently, wireless cooperative communications have emerged as a promising technology to reduce channel fading loss and improve the transmission reliability [1]-[5]
For the purpose of comparison, we examine the optimal power splitting and round-robin (OPS-RR) scheme and the traditional power splitting and joint sourcerelay selection (TPS-JSRS) scheme
The optimal power splitting and round robin (OPSRR) and traditional power splitting and joint source-relay selection (TPS-JSRS) schemes are proposed for comparison
Summary
R Ecently, wireless cooperative communications have emerged as a promising technology to reduce channel fading loss and improve the transmission reliability [1]-[5]. [21] proposed an optimal power allocation scheme for EH cooperative wireless network and derived the closed-form solutions. Differing from [25] and [26], where the AF protocol was adopted, in this paper, we jointly consider the power splitting and source-relay selection to improve the outage probability performance in an EH DF relay network. We propose an optimal power splitting and joint source-relay selection (OPS-JSRS) scheme for an EH DF relay network, which differs from [25] and [26], where the AF protocol was used. The optimal power splitting and round robin (OPSRR) and traditional power splitting and joint source-relay selection (TPS-JSRS) schemes are proposed for comparison.
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