Joint Equalization and Decoding for Nonlinear Two-Dimensional Intersymbol Interference Channels with Application to Optical Storage

摘要

An algorithm that performs joint equalization and decoding for nonlineartwo-dimensional intersymbol interference channels is presented. The algorithmperforms sum-product message-passing on a factor graph that represents theunderlying system. The two-dimensional optical storage (TWODOS) technology isan example of a system with nonlinear two-dimensional intersymbol interference.Simulations for the nonlinear channel model of TWODOS show significantimprovement in performance over uncoded performance. Noise tolerance thresholdsfor the algorithm for the TWODOS channel, computed using density evolution, arealso presented and accurately predict the limiting performance of the algorithmas the codeword length increases.