Novel V-BLAST-based Adaptive Modulation for MIMO-OFDM Systems over Frequency Selective Fading Channels

While most of existing adaptive modulation techniques for MIMO-OFDM systems focus on either maximizing data rate or minimizing transmit power, our work aims at minimizing average bit error rate (BER) under transmit power constraint with fixed throughput. In this paper, a novel adaptive modulation algorithm for minimizing BER is proposed by introducing additional constraints. Performance of proposed algorithm in wireless local area network (WLAN) environment is evaluated by computer simulation. Frequency selective fading channel model is simulated. Numerical results show that our proposed algorithm with low complexity yields better performance than existing suboptimal scheme under certain conditions.