New minimum error rate algorithms for DFE

Abstract

We propose new adaptive minimum symbol error rate algorithms (MSER) for decision feedback equalization over M‐ary PAM channels. In addition, we take into consideration biased as well as unbiased estimates leading to two major versions respectively called biased MSER (BMSER) and unbiased MSER (UMSER). The exact forms of these algorithms are computationally complex and require channel parameter information and thus must be processed off‐line. We thus modify the exact forms into stochastic and simplified versions to reduce computation load. The stochastic version requires no channel information and hence can be processed on‐line, but at the cost of convergence rate. Merits and characteristics of various versions are discussed and compared.