A space-time constant modulus algorithm for SDMA systems

We consider the problem of blind recovery of p synchronous i.i.d. communication signals that are transmitted through a linear spatio-temporal channel and captured by an m-element array. Such a situation may arise for example in a space-division-multiple-access (SDMA) mobile communication system. We propose an approach of the constant-modulus (CM) type in order to construct optimization criteria that may allow joint blind recovery of the transmitted signals with low computational complexity. Several aspects of the proposed algorithms related to their convergence and implementation are discussed and computer simulations are provided as experimental evidence to the algorithms´ performance