Spectral and Energy Efficiency in 3-Way Relay Channels with Circular Message Exchanges

TL;DR

This paper analyzes spectral and energy efficiency in 3-way relay channels, deriving sum rate expressions, capacity bounds, and proposing power allocation algorithms, supported by numerical results.

Contribution

It introduces new achievable sum rate expressions, capacity bounds, and joint power allocation algorithms for 3-way relay channels, enhancing understanding of efficiency optimization.

Findings

Derived achievable sum rate expressions for various protocols

Presented an outer capacity bound for 3-way relay channels

Developed algorithms for joint power allocation to improve energy efficiency

Abstract

Spectral and energy efficiency in 3-way relay channels are studied in this paper. First, achievable sum rate expressions for 3-way relay channels are derived for different relaying protocols. Moreover, an outer bound for the capacity of the 3-way relay channel is presented. Next, leveraging the derived achievable sum rate expressions, two algorithms for joint power allocation at the users and at the relay are designed so as to maximize the system energy efficiency. Numerical results are provided to corroborate and provide insight on the theoretical findings.