Optimal Power Allocation for the Two-Way Relay Channel with Data Rate Fairness

Abstract

Abstract-This letter studies data rate fairness on the twoway relay channel. It analytically determines the optimal power values at both nodes and at the relay, that lead to a maximization of the sum rate under the fairness constraint. Amplify-andForward (AF) and Decode-and-Forward (DF) relaying protocols are considered. For AF, the optimization problem is turned into a single-variable convex optimization problem. For DF, rate balancing between Multiple Access and broadcast phases must be performed prior to setting nodes powers. Both optimized protocols are compared with reference AF and DF in terms of data rates through numerical simulations.Index Terms-Two-way relay channel, power optimization, fairness, amplify-and-forward, decode-and-forward.

Joint Source-Channel Coding of JPEG 2000 Image Transmission Over Two-Way Multi-Relay Networks

“…In real-time image/video communications, this may cause severe degradation of the quality of service (QoS) for one user. In [15], a power allocation method is developed for two-way relay networks that considers the data rate fairness constraint. However, only one relay is considered in it.…”

Fairness-aware power allocation for asymmetric two-way AF relaying networks

“…In asymmetric traffic mode, one direction transmission may face outage with the other direction transmission at a certain data rate, even though data rate fairness [6] is achieved. Therefore, to ensure that both nodes play an identical role in the transmission, it makes more sense to study the outage performance fairness for asymmetric twoway AF relaying networks.In this Letter, we extend the existing work in [6], and consider outage performance fairness on asymmetric two-way AF relaying networks. We address the problem of power allocation for improving the poorer one's outage performance under a total power constraint so as to obtain an outage balance between the two end nodes.…”

“…In this Letter, we extend the existing work in [6], and consider outage performance fairness on asymmetric two-way AF relaying networks. We address the problem of power allocation for improving the poorer one's outage performance under a total power constraint so as to obtain an outage balance between the two end nodes.…”

“…Of particular interest is two-way amplify-andforward (AF) relaying networks [3,4]. Specifically, for a more efficient use of the power resources, considerable attention has been concentrated on the power allocation [5,6]. In [5], the power allocation is employed to achieve the trade-off of outage probability between two terminals under a total power constraint.…”

Two-Way Relaying Cooperative Wireless Networks: Resource Allocation and Performance Analysis

“…The joint resource allocation problem is formulated under total power constraints. Power allocation with data rate fairness is studied in [9] for Amplify-andForward (AF) and Decode-and-Forward (DF) protocols.…”