QoS-oriented scheduling algorithm for mobile multimedia in OFDM

In this paper, we propose and evaluate a new algorithm to schedule multimedia data in the multi-user OFDM wireless system. This algorithm allocates the resource dynamically in both time domain and frequency domain, based on the feedback channel state, packet QoS requirement and the amount of the data to be transmitted. It tries to guarantees the maximum delay, BER requirement and priority of the packet and improve system throughput, even with worse channel condition. Several neighboring subcarriers in OFDM are allocated together and by utilizing adaptive coding & modulation, they are transmitted with multiple data rates based on the channel state information. We study its performance on the channel model with Doppler fading, multi-path fading and path-loss. Simulation results show it is efficient to guarantee QoS for high rate multimedia data in OFDM system.