BER Enhancement of MIMO-OFDM Using an Optimized NLMS Receiver

In wireless communications, multi-channel transmission is utilized to obtain high capacity and better throughput efficiency. Multiple-Input Multiple-Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) is considered as a spectrally efficient approach to achieve high throughput communications. This paper investigates the performance of the MIMO-OFDM system using a NLMS adaptive receiver. The performances of using various values of the NLMS algorithm´s step-size were investigated and an optimum value was chosen, based on a trade-off between the convergence speed and the steady state Mean-Square-Error (MSE). Then, the bit error rate (BER) performance of the proposed NLMS adaptive receiver is compared with that of the conventional receiver.