access icon free 4-ary 14/16 modulation code for reducing two-dimensional inter-symbol interference

© The Institution of Engineering and Technology
Received 24/07/2018, Accepted 14/02/2020, Revised 25/09/2019, Published 20/02/2020

Holographic data storage (HDS) can access data in a short amount of time and can also quickly transmit data because HDS records and reads data in units of pages. Thus HDS is regarded as a promising candidate for future optical recording storage systems. Conventional storage systems such as CD, DVD, and HDD have one-dimensional (1D) inter-symbol interference (ISI). However, HDS has a 2D ISI that degrades performance. In this study, to avoid and overcome the 2D-ISI problem, the authors propose a 14/16 modulation code for 4-ary HDS systems which represents 2 bits on each pixel. The proposed 14/16 modulation code allows a bit of unwanted ISI cases in order to raise the code rate, but it has a higher code rate but similar performance compared to a 3/4 modulation code that has no unwanted ISI cases.

Inspec keywords: holographic storage; intersymbol interference; modulation coding

Other keywords: 2D-ISI problem; two-dimensional intersymbol interference; holographic data storage; code rate; word length 2.0 bit; optical recording storage systems; 4-ary 14/16 modulation code; HDS records; 4-ary HDS systems

Subjects: Optical storage and retrieval; Holography; Codes; Optical storage and retrieval; Electromagnetic compatibility and interference; Optical storage

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