Modified Two-Dimensional Soft Output Viterbi Algorithm for Holographic Data Storage

Abstract

We propose an alternate two-dimensional soft output Viterbi algorithm (2D SOVA) for holographic data storage. The proposed 2D SOVA uses a one-dimensional (1D) SOVA for both the horizontal and vertical directions. The 1D SOVA detects each direction with extrinsic information on the other direction's 1D SOVA. This proposed 2D SOVA has a better performance than a conventional 2D SOVA in terms of output bit error rate. (C) 2010 The Japan Society of Applied Physics