Abstract: With the goal of minimizing the overall transmit power while satisfying the required data rate, an adaptive algorithm combined exclusive manner with shared manner was proposed for multiuser MIMOOFDM systems in downlink scenario. Subcarriers allocation to users was conducted according to user spatial correlations in this algorithm. The users swith high spatial correlations were palced in same group, and on the basis of rule of propotion fairness, subcarriers were allocated in an exclusive manner in the same group. While in different groups, subcarriers were allocated in the shared manner using grouping zero forcing method. Then greedy method was used to allocate bits and power to different users. Simulation results show that the overall power of the proposed algorithm is less than both the exclusive manner and the shared manner, the spectrum efficiency is improved compared to the exclusive manner, and the number of antennas is less than that of the shared manner as well.

Key words: communication, MIMOOFDM, multiuser, adaptive resource allocation, zero forcing