Performance Analysis of MIMO SWIPT Relay Network with Imperfect CSI

Abstract

In this paper, we consider a dual-hop multiple-input multiple-output (MIMO) simultaneous wireless information and power transfer (SWIPT) relay network, where the source node (SN) uses a transmission antenna selection (TAS) scheme to concurrently send information and energy to the single-antenna relay node (RN). This helps to utilize the harvested energy to forward the received signal. In addition, the destination node (DN) employs the maximum ratio combining (MRC) scheme to process this forwarded signal. The performance of this MIMO SWIPT relay system is investigated in imperfect channel state information (CSI) condition. Specifically, we derive the exact and approximate closed-form expressions for the outage probability, the average capacity, and the symbol error probability (SEP). This is the first time the exact and approximate formulas for the SEP of the energy harvesting networks are investigated. The Monte Carlo simulation results are provided to demonstrate the relevance of the developed analytical results, showing that the system’s performance is significantly impacted by the CSI imperfection, the number of antennas, and the energy harvesting duration.