Abstract: Taking users' demand for both QoS and fairness into account,a joint sub-carrier and power allocation algorithm was proposed for OFDMA-based cooperative cellular networks. Existing sub-carrier allocation algorithm considers only average power allocation, in which incomplete application of power in relaying nodes exists. As a versus, we studied the optimal residual power allocation on the completion of sub-carrier allocation. Consequently, a water-filling power allocation scheme ground on dichotomy was given. Simulation shows that our proposed joint allocation algorithm can satisfy users' need for QoS and fairness,while it boosts the networking throughput dramatically.

Key words: OFDMA, Cooperative communication, Resource allocation, Fairness