Robust baud rate blind equalization for ATSC DTV receivers

A robust adaptive decision feedback equalizer (DFE) for ATSC standard terrestrial digital television (DTV) receivers is presented. Favorable transient and steady-state performance in representative channel conditions is achieved by adapting filter coefficients using a modified constant modulus algorithm. Computer simulations verify stable convergence of a DFE with an extended feedforward filter, which attenuates pre- echo aliases and thus reduces the steady-state mean-square error. Another contribution of the paper is to demonstrate sufficient resilience of a symbol-spaced feedforward filter to timing phase offsets, obviating the need for a fractionally-spaced feedforward section and consequently reducing the hardware requirements.