Subcarrier Allocation Algorithm for an OFDMA Relay Network with Multicells

In this paper, a new subcarrier allocation algorithm is proposed for an OFDMA relay network with multicells. In the proposed algorithm, subcarriers are allocated to users and relays so as to maximize the overall sum of the achievable rate under fairness constraints. Fairness constraints are imposed on the minimum rate requirement of users and the maximum power of base stations and relays. Simulation results show that the proposed algorithm achieves higher spectral efficiency than the static algorithm and reduces the outage probability compared to the static and greedy algorithms. Index terms — Cooperative communication, OFDMA, fairness, resource allocation.