MIMO blind second-order equalization method and conjugate cyclostationarity

The blind identification of vector-valued FIR transfer functions using excl usively second-order statistics of the output has become conventional. The so-called subspace method provides a nice and efficient way of solving the problem, However, the extension to the multi-input/multi-output (MIMO) case is not that straightforward, and, for instance, some indetermination drawb acks may occur. We show in this correspondence that the introduction of som e cyclostationarity at the input (which still leads to feasible systems) ma y lead to an algorithm that is far more satisfactory because for both, it i s less prone to indetermination problems, and the required assumptions are not too sophisticated.