Separating ISI and CCI in a two-step FIR Bezout equalizer for MIMO systems of frequency-selective channels

The use of multiple antennas at both the transmitter and the receiver in wireless communications implies a great channel capacity, but the signal detection is a crucial problem in achieving channel capacity, particularly in the general case of frequency selective channels, where both intersymbol interference (ISI) and cochannel interference (CCI) are significant. We show that ISI and CCI can be separated and then be cancelled in two different steps. We develop a two-step FIR Bezout equalizer and deduce the theoretically smallest length of its equalization filter.