title: Soft-decision array decoding for volume holographic memory systems.
abstract: We study the use of soft-decision array decoding in a volume holographic memory (VHM) system that is corrupted by interpixel interference (IPI) and detector noise. Soft-decision methods can unify equalization and error decoding. A highly parallel array decoder is presented in the context of two-dimensional low-pass channel mitigation and error correction. The new decoding algorithm is motivated by iterative turbo-decoding methods and is capable of incorporating a priori knowledge of the corrupting IPI channel during decoding. The resulting joint detection decoding algorithm is shown to offer VHM capacity and density performance superior to that of hard-decision n = 255 Reed-Solomon codes in concatenation with a Wiener filter.
authors.affiliation: Department of Electrical and Computer Engineering, University of Arizona, Tucson 85721, USA. awc005@email.mot.com
authors.forename: W
authors.initials: W
authors.lastname: Chou
authors.forename: M A
authors.initials: MA
authors.lastname: Neifeld