Performance Analysis of Decode-and-Forward Based SWIPT Systems with Direct Link

Abstract

The performances are investigated in the paper for the decode-and-forward (DF) based simultaneous wireless information and power transfer (SWIPT) system, which are evaluated by the outage probability and ergodic capacity. In the SWIPT system, the source node transmits the signal to the destination node via an energy constrained DF relay node. For utilizing the direct link from the source node to destination node, the destination node adopts the selection combining (SC) scheme to merge the signals coming from different links. The closed-form and integral results for the outage probability and the ergodic capacity of the system are derived, respectively. Simulation results show that the performance of the proposed DF SC scheme is superior to the existing schemes.