Improved algorithm of multiuser dynamic subcarrier allocation in 0FDM system

In multiuser OFDM systems, because the subcarriers of each user undergo independent channel fading, then each subcarrier can be allocated to the most appropriate user to maximally improve the system capacity. In this paper, we study the optimal subcarrier and power allocation algorithm for wideband OFDM systems. To minimize total transmit power with constraints on BER and each user´s rate requirement, in the two steps joint allocation method, we proposed an improved rate craving greedy multiuser dynamic subcarrier allocation algorithm. Analysis and simulation results show that our algorithm offers comparable complexity and better performance than original method.