Abstract
This paper investigates the outage probability of an energy harvesting (EH) relay-aided cooperative network, where a source node transmits information to its destination node with the help of an energy harvesting cooperative node. For such a system, we derive an explicit closed-form expression of outage probability over Nakagami-m fading channels for both amplify-and-forward (AF) and decode-and-forward (DF) relay protocols, and we verify the explicit closed-form expressions of outage probability with the Monte Carlo method. It is shown that the simulation results match well with the numerical ones. From the numerical analysis and simulation results, it can be observed that the system parameters have great impact on both AF and DF relay systems. For the DF system, with the increment of the power splitting ratio, the system outage probability decreases, while for the AF system, with the increment of the power splitting ratio, it first increases and then decreases. Besides, for both DF and AF systems, when the relay is placed relatively closer to the source, better outage performance will be achieved.
Highlights
Nowadays, Energy harvesting has appeared as a promising approach to prolong lifetime of energy constrained wireless communication system [1,2,3,4], which is usually equipped with replacing or recharging batteries
Plenty of works have been done for various wireless networks, including cooperative relaying network [12,13,14,15,16], power allocation strategies [17,18,19], resource scheduling [20, 21], and multiple-input multiple-out (MIMO) system [22,23,24] or multiple-input single-output (MISO) [25, 26]
We focus on a two-way relay simultaneous wireless information and power transfer (SWIPT) system over Nakagami-m fading, which consists of a source-destination (S-D) pair and a relay node R embedded power splitting (PS)
Summary
Energy harvesting has appeared as a promising approach to prolong lifetime of energy constrained wireless communication system [1,2,3,4], which is usually equipped with replacing or recharging batteries. The authors in [13] investigated the outage performance of the relay network over rayleigh fading channels where both AF and DF protocols were considered. We focus on a two-way relay SWIPT system over Nakagami-m fading, which consists of a source-destination (S-D) pair and a relay node R embedded power splitting (PS) (see Fig. 1). The contributions are expressed as below: at first, we derive a closed-form expressions of outage probability at two-way relay cooperation group for AF and DF relaying schemes with Nakagami-m fading channels respectively. We simulate the outage probability of two-way relay SWIPT systems with Monte Carlo method; at the same time, we consider the impact of power splitting fraction, the position of the relay node between the source node and destination node, the buffer energy capacity of relay node harvesting from ambient environment, etc.
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