Translator Disclaimer
2 October 1998 Construction of low-complexity highly efficient deterministic modulation codes with adjustable codeword length and error control capability
Author Affiliations +
Run-length limited RLL(0,k) modulation or k-constrained codes are being used in optical and magnetic recording systems. In this paper a new methodology for the construction of highly efficient modulation codes and in particular new enhanced RLL(0,k) coding schemes are presented. The new methodology generates modulation codes computationally simpler than the existing ones, empowered with partial error detection (PED) capability at the demodulator for improved error control reliability. An increased list of constraints is formed, rather than just constraints pertaining to d, k, I only. Even though concatenation of conventional RLL with ECC can reduce the effectiveness of the ECC, especially with a sliding block encoder/decoder subject to error propagation, a concatenated PED capability can boost the outer ECC performance. Note that in current system using low redundancy ECC, the overall rate is mainly determined by the modulation code rate which critically is to be maintained high. RLL/PED code rates of 8/9, 16/17, 24/25 and 32/33 or higher are achievable. The proposed fixed length block decodable RLL/PED, are generalized schemes of the type: n/n + 1(d equals 0, k equals n - 1/I equals n), and n/n + 1(d equals 0, k equals(n/2/I equals n) where n (epsilon) (Zeta) $GREG5. The encoding/decoding/error-control equations and the global k and interleave I-constraints, are expressed as functions of n, so that fixed encoder/decoder/error-control architectures are obtained in terms of any adjustable work length n, and consequently any code rate n/n + 1. They are characterized by computational simplicity irrespective of the codeword length n, or the code rate. Applicability of the proposed methodology in the construction of Maximum Transition Run codes, is also addressed.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Anthony G. Bessios "Construction of low-complexity highly efficient deterministic modulation codes with adjustable codeword length and error control capability", Proc. SPIE 3461, Advanced Signal Processing Algorithms, Architectures, and Implementations VIII, (2 October 1998);


The CubeSat Laser Infrared CrosslinK Mission (CLICK)
Proceedings of SPIE (July 11 2019)
Constrained coding for the deep-space optical channel
Proceedings of SPIE (April 25 2002)
Probability of undetected errors of optical wireless links
Proceedings of SPIE (December 07 1995)
Study on multi level encoding flow for optical storage based...
Proceedings of SPIE (September 15 2005)
High-performance parallel input device
Proceedings of SPIE (December 20 1993)

Back to Top