Resource Allocation with Subcarrier Pairing in OFDMA Two-Way Relay Networks

TL;DR

This paper presents an efficient algorithm for resource allocation in OFDMA two-way relay networks, optimizing subcarrier pairing, relay selection, and power allocation to significantly enhance system performance.

Contribution

It introduces a dual method-based algorithm for joint optimization of subcarrier pairing, relay selection, and power allocation in OFDMA two-way relay networks.

Findings

Significant performance improvement over conventional methods

Efficient asymptotically optimal algorithm proposed

Effective joint optimization of multiple resource allocation aspects

Abstract

This study considers an orthogonal frequency-division multiple-access (OFDMA)-based multi-user two-way relay network where multiple mobile stations (MSs) communicate with a common base station (BS) via multiple relay stations (RSs). We study the joint optimization problem of subcarrier-pairing based relay-power allocation, relay selection, and subcarrier assignment. The problem is formulated as a mixed integer programming problem. By using the dual method, we propose an efficient algorithm to solve the problem in an asymptotically optimal manner. Simulation results show that the proposed method can improve system performance significantly over the conventional methods.