In OFDMA-based wireless cooperative multicast systems,it is impossible to guarantee successful transmission of every data due to instant deep fading. Hence, in order to solve the problem,resource optimization algorithms form frequency and power resource was exploited.A cooperative joint subcarrier and power allocation scheme that minimizes the probability of multicast transmission failure were proposed.Cooperative proportional (CP) subcarrier allocation strategy and iterative power (IP) allocation strategy were proposed to achieve tradeoff between throughput and fairness,and fully utilize the limited power,respectively.Simulation results showed that system performance of the schemes with cooperation is significantly enhanced compared with that without cooperation and the scheme with IP remarkably outperform that without IP.Therefore,the schemes can overcome the effect of instant deep fading,and guarantee the reliable multicast transmission.
