Serial Maximum a Posteriori Detection of Two-Dimensional Generalized Partial Response Target for Holographic Data Storage Systems

Abstract

Holographic data storage (HDS) is an emerging technology that promises to revolutionize digital data storage and access. Unlike traditional storage media such as hard drives and flash memory, HDS uses light to write and read page-oriented two-dimensional (2D) data from volume media. This allows for significantly higher densities and faster data transfer rates in HDS systems. However, 2D interference is a serious issue in HDS due to hologram dispersion during the reading process. Therefore, we present a novel detection algorithm based on maximum a posteriori (MAP) detection to mitigate 2D interference. In our proposed model, we inherited the structure of the serial generalized partial response target to design the serial structure for MAP detection. The simulation results show that the proposed model can achieve a high bit error rate performance.

A Nonlinear Convolutional Neural Network-Based Equalizer for Holographic Data Storage Systems

“…In [17], to develop the 2D SOVA, the authors designed the iterative algorithm for 2D SOVA. Subsequently, based on the generalized PR (GPR) target, as specified in [18], Nguyen and Lee proposed serial detection and a maximum a posteriori (MAP) detection algorithm to improve BER performance [19]. For HDS systems, in [20], the authors proposed a modified 2D SOVA with 2D PR target to reduce 2D ISI.…”

“…In the HDS channel, based on [19], α = 0.85 can be shown to achieve the best performance for the HDS channel. Applying the minimum mean square error (MMSE) algorithm, as specified in [18], the parameters for F and T can be estimated as follows:…”

“…Therefore, received signal r[j,k] is passed through the nonlinear equalizer (CNN) to reduce the 2D ISI and electric noise. Because of using the serial target form, signal z[j,k] can be detected using serial detection, as in[19].Signal z[j,k] is passed through the horizontal detector to create signal b[j,k]. Signal b[j,k] is then passed through the vertical detector to restore modulated signal ŝ[j,k].…”