Time-Switching Based SWIPT for Network-Coded Two-Way Relay Transmission with Data Rate Fairness

TL;DR

This paper proposes a time-switching based SWIPT protocol for network-coded two-way relay systems, optimizing throughput with data rate fairness and analyzing performance trade-offs under power constraints.

Contribution

It introduces a novel TS-based two-way relaying protocol and formulates an optimization problem to maximize throughput with fairness, providing explicit results and an efficient solution.

Findings

TS-TWR achieves comparable performance to traditional relaying at certain SNR levels.

Performance loss due to energy harvesting is small in low and high SNR regimes.

Numerical results validate the effectiveness of the proposed protocol and optimization.

Abstract

This paper investigates the simultaneous wireless power and information transfer (SWPIT) for network-coded two-way re- lay transmission from an information theoretical viewpoint, where two sources exchange information via an energy har- vesting relay. By considering the time switching (TS) relay receiver architecture, we present the TS-based two-way re- laying (TS-TWR) protocol. In order to explore the system throughput limit with data rate fairness, we formulate an op- timization problem under total power constraint. To solve the problem, we first derive some explicit results and then de- sign an efficient algorithm. Numerical results show that with the same total available power, TS-TWR has a certain per- formance loss compared with conventional non-EH two-way relaying due to the path loss effect on energy transfer, where in relatively low and relatively high SNR regimes, the perfor- mance losses are relatively small.