Decoupled Space-Time Equalization for CCI/ISI Suppression in Mobile Communication Systems

"In this contribution, we present a family of decoupled spacetime (D-ST) equalizers for improved reception in the presence of co-channel interference (CCI) and inter-symbol interference (ISI) in mobile communication systems. Basically, a D-ST equalizer separates CCI and ISI suppression in two processing stages. In the first one, an adaptive array (AA) spatially cancels only the co-channel interferers, while in the second one an equalizer performs temporal ISI suppression. The main idea of D-ST equalization is to use all the degrees of freedom of the array to improve CCI reduction and to preserve all ISI structure of the desired signal to be better exploited by a temporal equalizer following the array. In order to accomplish this task, a canceling filter is employed to generate a filtered version of the training sequence used to cancel the user signal in array coefficient adjustment. Simulation results are presented to compare the performance of some D-ST equalizers to that of conventional space-time structures in CCI/ISI-limited scenarios."