Advanced Coding for Recording Systems
Date Issued
2009
Date
2009
Author(s)
Chen, Hsin-Yi
Abstract
Abstractn this thesis, we study the run-length-limited (RLL) constrained coding and error-correcting coding (ECC) for storage recording systems. First, we introduce the characteristics and models of recording channel such as magnetic recording channel, optical recording channel and partial response channel. Then, we describe the ECC which be used in this thesis for the recording systems. There are two main research topics to be illustrated as follows.he first research topic, we use the binary RLL (d, k) coding with traditional ECC coding to apply to the recording systems, including the RLL (d, k) coding is needed to avoid the adverse effect of inter-symbol interference (ISI) and to facilitate the operation of synchronization. We propose two techniques for the low-density parity-check (LDPC) coded partial response channel with run-length-limited (RLL) constraints. The first is a modification of the selective flipping technique so that side information is not needed. The second is based on the estimation of flipped bits for the selective flipping technique. The second technique can achieve significant performance improvement over the simple selective flipping technique either with side information or without side information. We also incorporate these two techniques into a known technique to design LDPC coded recording systems that can meet strict RLL constraints without performance degradation.ultilevel recording technology increases the capacity of traditional binary recording systems such as standard compact disc (CD) and digital versatile disc (DVD) rewritable systems with no change to the optical/mechanical unit. In order to improve the performance of multilevel recording systems and increase the data storage capacity and density, we further investigate non-binary, or multilevel, M-level RLL coding techniques for multilevel recording system. Therefore, in second research topic, we investigate some capacity approaching M-level RLL codes for multilevel recording systems. We begin our study by searching for capacity-approaching primitive code constructions and derive the achievable rates of M-level RLL codes of finite code lengths. Then, we propose two practical code constructions for multilevel RLL block codes for which the rates are very close to the capacity. For each code construction, we propose a variation which has the merit of low complexity of encoding and decoding. Both the derived coding rates and coding rates of the constructed M-level RLL codes can closely approach the capacity. Simulation for two recording system models is implemented to see the combined effect of channel coding and the constructed RLL coding over a partial response channel and an optical recording channel. eywords: constrained codes, low-density parity-check (LDPC) codes, magnetic recording channel, multilevel, M-level, optical recording channel, partial response channel, run-length-limited (RLL) codes, Reed-Solomon (RS) codes.
Subjects
constrained codes
low-density parity-check (LDPC) codes
magnetic recording channel
multilevel
M-level
optical recording channel
partial response channel
run-length-limited (RLL) codes
Reed-Solomon (RS) codes.
Type
thesis
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