Multivariable decision feedback equalizer for space diversity in multi-input/output channel

The recent results of multiple antennas show that a substantial capacity improvement can be achieved. In particular, space-time spreading is a good example combining space-time coding and multiple antennas. To explore this, this paper proposes a multivariable DFE (decision feedback equalizer) which performs ISI (intersymbol interference) rejection by multiple transmit and receive antennas. Different multiple channels and paths are assumed between different transmit and receive antennas. Using the expression of multivariable DFE in a MIMO (multi-input multi-output) channel, we investigate the performance of multivariable DFE according to the number of Tx and Rx antennas by the effective average SNR in the discrete-time multipath channels.