BER performance assessment of linearized MIMO transmitters in presence of RF crosstalk

This paper investigates the effect of nonlinear crosstalk on the overall performance of the MIMO transmitter. It proposes a linearization technique to correct for the effect of crosstalk and hence enhance the BER performance of the MIMO system. Recently it was shown that in the presence of nonlinear crosstalk, the conventional digital predistortion technique is unable to linearize the transmitter, which leads to significant degradation in bit-error-rate of the MIMO system. In this regard, a new digital predistortion method known as crossover digital predistorter (CO-DPD) is developed and implemented. The simulation results show that the CO-DPD model is able to both compensate for the transmitter nonlinearity and achieve BER results close to the ideal MIMO transmitter.