Relay Selection with Network Coding in Two-Way Relay Channels

TL;DR

This paper introduces relay selection schemes with network coding for two-way relay channels, demonstrating improved error rates and performance gains over existing methods through analysis and simulations.

Contribution

It proposes novel relay selection schemes with network coding for two-way channels, providing analytical BER expressions and showing performance improvements.

Findings

Dual relay selection with NC outperforms other schemes

Proposed schemes offer selection and network coding gains

Analytical BER expressions validated by simulations

Abstract

In this paper, we consider the design of joint network coding (NC)and relay selection (RS) in two-way relay channels. In the proposed schemes, two users first sequentially broadcast their respective information to all the relays. We propose two RS schemes, a single relay selection with NC and a dual relay selection with NC. For both schemes, the selected relay(s) perform NC on the received signals sent from the two users and forward them to both users. The proposed schemes are analyzed and the exact bit error rate (BER) expressions are derived and verified through Monte Carlo simulations. It is shown that the dual relay selection with NC outperforms other considered relay selection schemes in two-way relay channels. The results also reveal that the proposed NC relay selection schemes provide a selection gain compared to a NC scheme with no relay selection, and a network coding gain relative to a conventional relay selection scheme with no NC.