Throughput Analysis for Decode-and-Forward Relaying Protocol with Wireless Energy Harvesting and Information Processing

In this paper, we consider the time switching relaying (TSR) protocol for decode-and-forward (DF) based single-way and two-way relaying networks consisting of a source, one relay, and a destination. The relay is assumed to have a rechargeable battery with a limited amount of remaining energy that is used for harvesting energy from the signal transmitted by the source. Analytical expressions for delay-limited and delay-tolerant throughputs are derived. Numerical results are employed to show the effect of different system parameters on the achievable throughput at receiving nodes.

I. Introduction

Wireless sensor networks have been used for many years. In recent years, cheaper and smaller sensor nodes have been employed. In many cases, the lifespan of a sensor network is limited by the battery life of its sensors. As a results researchers have tried to lower the power consumption of the sensor nodes. At the same time, energy harvesting has emerged to further reduce the power consumption of these nodes. One approach is to use radio frequency (RF) signal as the source of energy harvesting [1]-[10]. Although other physical energy sources can also be used for recharging the nodes [2], [3], these techniques are unreliable and highly variable [4]. The main advantage of energy harvesting through RF signals over other conventional methods is that using this technique, the receiving nodes can obtain their required energy from the same source that is conveying data toward them [5]-[10].