Abstract
In this paper, we study relay selection in decode-and-forward wireless energy harvesting cooperative networks. In contrast to conventional cooperative networks, the relays harvest energy from the source’s radio-frequency radiation and then use that energy to forward the source information. Considering power splitting receiver architecture used at relays to harvest energy, we are concerned with the performance of two popular relay selection schemes, namely, partial relay selection (PRS) scheme and optimal relay selection (ORS) scheme. In particular, we analyze the system performance in terms of outage probability (OP) over independent and non-identical (i.n.i.d.) Rayleigh fading channels. We derive the closed-form approximations for the system outage probabilities of both schemes and validate the analysis by the Monte-Carlo simulation. The numerical results provide comprehensive performance comparison between the PRS and ORS schemes and reveal the effect of wireless energy harvesting on the outage performances of both schemes. Additionally, we also show the advantages and drawbacks of the wireless energy harvesting cooperative networks and compare to the conventional cooperative networks.
Highlights
Energy harvesting from natural resources is unstable since it mainly depends on environment conditions
We are concerned with the outage performance of a dual-hop DF relaying network where the relays are equipped with wireless energy harvesting technology
Relay selection schemes are used in the network in order to increase the diversity gain
Summary
Energy harvesting from natural resources is unstable since it mainly depends on environment conditions. Several works in the literature have studied wireless energy harvesting using RF signal for classical cooperative networks which consist of one source, one destination, and one relay. Assuming that there are multiple available relays that assist the source-destination transmission, relay selection schemes have studied in wireless energy harvesting cooperative networks. In our previous work [14], the PRS scheme was investigated in wireless energy harvesting relay networks over independent and identical (i.i.d.) Rayleigh fading channels. Different from the above related works, this paper considers dual-hop DF cooperative networks with multiple WEH relays over independent and non-identical (i.n.i.d.) Rayleigh fading channels, where the direct link between source and destination is not available due to severe fading or shadowing. Optimal relay selection (ORS) schemes in wireless energy harvesting cooperative networks under independent and non-identical Rayleigh fading channels.
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