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. 1. INTRODUCTION To meet the increasing demands on higher data rates, quality, coverage and capacity of wireless systems, the use of an..

Modified Array Manifold for Signal Waveform Estimation in Wireless Communications

In wireless communication scenarios, local scatterers in the vicinity of the sources cause angular spreading. Herein, a parameterization of the spatial signature in the presence of local scattering is presented which applies to uniform linear arrays (ULAs). The spatial signature is shown to be approximately a Vandermonde vector for a ULA in environments with small angular spread. An estimator of the spatial signature is formulated based on ESPRIT. For a simple signal waveform estimator, the gain may be considerable in scenarios with multiple sources, as compared with using the ideal manifold parameterized by direction of arrival (DOA). 1. Introduction The use of antenna arrays at base stations in wireless communication systems has received substantial interest, see e.g. [3, 9]. Increased range and decreased co-channel interference may be obtained, leading to increased coverage and increased capacity of the system. The problem of uplink (mobile to base) signal waveform estimation in en..