On Spatio-temporal Interference Rejection Combining with Antenna Arrays

In this work, space-time processing for co-channel interference (CCI) reduction and intersymbol interference (ISI) equalization with antenna arrays is studied. As compared to spatial-only processing, the space-time processing proposed takes the temporal correlation of the CCI into account by modeling the noise and CCI as a Gaussian vector valued autoregressive process. This is a good approximation in interference limited scenarios and suitable for implementation with a maximum likelihood sequence estimator. For spatial-only processing, the time dispersion of the CCI may limit the performance, whereas this is not the case with space-time processing. Space-time processing provides large gains in interference rejection as compared to spatial-only processing when time dispersion increases the dimension of the subspace to which the interference is confined.