A Block Factor Analysis Based Receiver for Blind Multi-User Access in Wireless Communications

In this paper, we present a technique for the blind separation of DS-CDMA signals received on an antenna array, for a multi-path propagation scenario with inter symbol interference. Our method relies on a new third-order tensor decomposition, which is a generalization of the parallel factor model. We start with the observation that the temporal, spatial and spectral diversities give a third-order tensor structure to the received data. This tensor is then decomposed in a sum of contributions by means of an alternating least squares algorithm, where each contribution fully characterizes one user