Radial basis function network assisted space-time equalisation for dispersive fading environments - Electronics Letters

Introduction: The capability of receivers employing multiple antennas to increase the achievable system capacity and to suppress the effects of co-channel interference has motivated intense research in the field of space-time equalisation [1]. Most contributions, however, focus on sub-optimal linear receivers or investigate the performance of maximum-likelihood sequence estimators (MLSE), which suffer from an exponentially increasing complexity against the delay-spread encountered. Because it encounters non-minimum phase channels, the received signal constellation may become linearly non-separable and to counteract this problem we introduce a novel nonlinear radial basis function network (RBFN) [2] assisted space-time equaliser (STE) for uplink communication scenarios. For the sake of complexity reduction an RBF-aided decision feedback (DF) structure is used, which necessitates the detection of all users. The investigated scenario assumes multiple users communicating with the basestation (BS) over singleinput multiple-output (SIMO) Rayleigh fading channels.