Combining blind equalization with constant modulus properties

TL;DR: In this article, the authors proposed an approach to multi-user blind space-time equalization exploiting the constant modulus modulation properties of the source signals. But this approach requires both a blind equalization and a blind source separation based on the modulation properties.

Abstract: This paper presents an approach to multi-user blind space-time equalization exploiting the constant modulus (e.g. BPSK, m-PSK or QAM) modulation properties of the source signals. This is a problem that asks for both a blind equalization and a blind source separation based on the modulation properties. Previously proposed algorithms have consisted of two steps in sequence: equalization to linear mixtures of the source signals followed by separation of these mixtures, or separation into constant modulus source signals at several delays followed by assigning outputs to corresponding users. We combine both types of properties into a one-stage algebraic technique.