Outage Analysis of Cooperative Transmission with Energy Harvesting Relay: Time Switching vs Power Splitting

TL;DR

This paper compares two energy harvesting relay protocols, time switching and power splitting, for multiuser cooperative transmission, showing that both improve reliability and reduce outage probability without extra energy consumption.

Contribution

It introduces two novel protocols for EH relay systems and provides explicit outage probability analysis for each, highlighting their advantages over traditional schemes.

Findings

PSCMT protocol achieves lower outage probability than TSCMT.

Both protocols outperform non-cooperative schemes in reliability.

Analytical results match numerical simulations accurately.

Abstract

Recently, energy harvesting (EH) has emerged as a promising way to realize green communications. In this paper, we investigate the multiuser transmission network with an EH cooperative relay, where a source transmits independent information to multiple destinations with the help of an energy constrained relay. The relay can harvest energy from the radio frequency (RF) signals transmitted from the source, and it helps the multiuser transmission only by consuming the harvested energy. By adopting the time switching and the power-splitting relay receiver architectures, we firstly propose two protocols, the time-switching cooperative multiuser transmission (TSCMT) protocol and the power-splitting cooperative multiuser transmission (PSCMT) protocol, to enable the simultaneous information processing and EH at the relay for the system. To evaluate the system performance, we theoretically analyze the system outage probability for the two proposed protocols, and then derive explicit expressions for each of them, respectively. Moreover, we also discuss the effects of system configuration parameters, such as the source power and relay location on the system performance. Numerical results are provided to demonstrate the accuracy of our analytical results and reveal that compared with traditional non-cooperative scheme, our proposed protocols are green solutions to offer reliable communication and lower system outage probability without consuming additional energy. In particular, for the same transmit power at the source, the PSCMT protocol is superior to the TSCMT protocol to obtain lower system outage probability.