DECISION-FEEDBACK EQUALIZATION OF TIME-DISPERSIVE CHANNELS WITH CODED MODULATION

This paper extends the work of Eyuboglu on decision-feedback equalization (DFE) applied to coded systems with interleaving. We study the adaptive implementation of the DFE using recursive least-sqnares algorithms (RLS). System performance on time-dispersive channels with spectral nulls as well as channels with relatively small intersymbol interference is investigated. A reference insertion method is used to improve system performance, and a two-stage processing technique is adopted to use the more reliable decisions from the decoder in equalizer coefficient adaptation. Simulation results show that the RLS implemented DFE systems with coded modulation can successfully combat severe channel distortion while maintaining the coding gain over corresponding nncoded systems. © 1990 IEEE