Performance Analysis for a Multistage Radio Resource Allocation Scheme in MIMO-OFDMA Multihop System with Fairness Consideration

In this paper, we investigate a radio resource allocation scheme for orthogonal frequency-division multiple-access (OFDMA)-based multiple-input multiple-output (MIMO) multihop networks. The half-duplex orthogonal relay channel construction method and related multihop transmission mechanism are designed to avoid the inter-hop interference. We propose a multistage resource allocation scheme for throughput maximization. And, the fairness consideration on sharing subcarriers among relay nodes is also discussed. Simulation results show that the spatial diversity gain offered by relay antenna array can effectively balance the tradeoff between the fairness performance and the system throughput. Results also show the proposed scheme is efficient with channel impairment when relay nodes are subject to severe shadowing effects.