基于多用户MIMO-OFDM系统的子信道和功率分配算法

在多用户MIMO-OFDM系统中，当总功率受限时，为了使整个系统的数据传输速率最大．已有的最优算法的计算十分复杂，这里采用了一种次最优算法。在发射端，基于已知信道状态信息。应用奇异值分解将MIMO信道转化为并行的子信道，并将表征信道增益的信道特征值用于子信道自适应调制优化设计中。在自适应过程中．用到了子信道和功率联合分配算法。仿真结果表明，这种算法能使系统的性能明显提高。

Adaptive Subchannel and Power Allocation Algorithm Based on Multiuser MIMO-OFDM Systems

To maximize the overall rate under a total power constraint in multiuser MIMO-OFDM,Achieving the optimal solution is computationally demanding thereby necessitating the use of sub-optimal techniques.At the transmitter,singular value decomposition(SVD)method was utilized to transform the spatial multiplexing channel into parallel subchannels based on the known channel state information.The eigenvalues of channel matrix representing the subchannel gains were employed in the optimization design of subchannel's adaptive modulation scheme.In adaptive we propose an algorithm that performs joint subchannel and power allocation.Simulation results are shown this algorithm may enhance the system performance.