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研究了一种针对MIMO-OFDM系统的自适应分步功率分配算法,在通信系统总功率约束的情况下,采用速率最大化准则计算开关信道的临界值,从而利用最小均方误差准则进行自适应分步功率分配.仿真表明:基于分步算法自适应功率分配的MIMO-OFDM系统误码率低于采用注水算法和MMSE算法的系统误码率,其频谱效率也优于另外两种算法;同时,对于分步算法,随着天线数目的增加,系统的误码率明显降低,频谱效率明显提高,验证了该算法没有奇异性.
An adaptive step-by-step power allocation algorithm for MIMO-OFDM systems is studied. In the case of total power constraints of the communication system, the critical value of the switching channel is calculated using the rate maximization criterion, so that the minimum mean square error criterion The simulation results show that the BER of MIMO-OFDM system based on step-by-step adaptive power allocation is lower than the system error rate of watermarking algorithm and MMSE algorithm, and the spectral efficiency is better than the other two algorithms For the step-by-step algorithm, as the number of antennas increases, the bit error rate of the system is significantly reduced, and the spectrum efficiency is obviously improved, which proves that the algorithm has no singularity.