PTV-CMA blind equalization and interference suppression

The problem of blindly equalizing a digital communication signal distorted by a linear time-invariant channel, and contaminated by severe co-channel or adjacent-channel digital interference, is considered in this paper. We propose here to adopt a two-stage periodically time-varying (PTV) equalizer; in the first stage, partial interference suppression is achieved by resorting to linear PTV filtering, which allows the second stage, based on a PTV version of the constant modulus algorithm (CMA), to reliably recover the transmitted information symbols. The effectiveness of the new approach is corroborated by the results of computer simulations.