Abstract:

This paper presents an adaptive resource allocation scheme based on proportional fairness for MIMO-OFDMA downlink systems. Based on MIMO channel state information and by using the eigen channels to determine subcarrier and power allocation, the proposed scheme has the ability to simultaneously exploit space, frequency and multiuser diversity to improve spectrum efficiency. A non-iterative linear power allocation method with low complexity is derived with the proposed relaxation of strict user rate proportionality constraints. Simulation results show that the new adaptive allocation scheme can achieve good tradeoff between capacity and fairness, and provide much better capacity gain than conventional schemes, while requiring significantly less computation complexity.

Key words:

resource allocation, MIMO-OFDMA, proportional fairness, water-filling