Low complexity resource allocation scheme with fairness for MIMO-OFDMA downlink systems

This paper presents a new scheme based on proportional fairness for MIMO-OFDM downlink resource allocation, which considers allocation of subcarriers and power to each user to maximize the sum of user data rates, subject to constraints on total power, bit error rate, and proportionality among user data rates. A linear non-iterative power allocation method with low complexity is deduced by relaxation of strict user rate proportionality constraints. Simulation results show that this new adaptive allocation scheme can achieve good tradeoff between capacity and fairness as well as provide much better capacity gain than the conventional static TDMA allocation method, while requiring significantly less computation.