On the Uplink Spectral Efficiency of Full-Duplex Cooperative OFDMA Systems

TL;DR

This paper proposes a resource allocation algorithm for uplink full-duplex OFDMA cellular networks with relay users, optimizing subcarrier and power allocation to maximize sum rate while ensuring QoS, and demonstrates its effectiveness through simulations.

Contribution

It introduces a novel relay selection and resource allocation algorithm for full-duplex OFDMA systems, converting the problem into a convex optimization for efficient solving.

Findings

Increased sum rate with the proposed scheme.

Improved network coverage and efficiency.

Effective relay and subcarrier assignment results.

Abstract

In this paper, we develop a resource allocation algorithm for uplink of in-band full-duplex (FD) cellular networks. The FD cellular network is assumed to be based on orthogonal frequency division multiple access (OFDMA) and consists of a base station communicating with multiple users. Some of the users in the network act as relay for other users and help them to transmit their data to the base station. These relays are FD and work based on amplify and forward (AF) protocol. By appropriate selection of the relays and optimized allocation of subcarriers and powers to all users, we try to maximize the total sum rate of the network. During this optimization, we also impose some constraints on the users' quality of service (QoS) and power. We propose a new algorithm to select the best relays based on the users' maximum data rate and also use Linear Assignment Problem Jonker-Volgenant (LAPJV) algorithm for subcarrier assignment. It is proved that the resulting optimization problem can be converted to a convex problem, and hence it can be solved by standard numerical methods. The simulation results demonstrate the effect of the proposed scheme on the sum rate and coverage of the network.