Blind decision feedback equalization of time-varying channels with DPSK inputs

This paper presents a new method to the blind equalization of a class of li near time-varying mobile channels for differentially encoded channel input signals. Through reparameterization, the equivalent discrete system can be modeled as a single-input multiple-output system. Unlike some existing meth ods, this new algorithm does not require prior knowledge on the cyclic freq uency of the channel response. The algorithm is simple and relies only on a decision feedback structure and the differential encoding nature of the ch annel input signals. The convergence analysis of the decision feedback syst em is presented along with simulation examples.