Adaptive Trellis Using Interim Maximum-Likelihood Detector Output for a Holographic Storage System

Abstract

The performance of partial response maximum likelihood (PRML) for holographic data storage can be reduced by asymmetric channel characteristics such as radial/tangential tilts. Therefore, we proposed the adaptive trellis scheme to improve performance. The proposed algorithm updates the reference branch values through using interim maximum-likelihood detector output, using the changed channel condition. Thus, this system guarantees better bit error rate performance than conventional PRML detection. (C) 2011 The Japan Society of Applied Physics