Title :
Turbo-coded optical recording channels with DVD minimum mark size
Author :
McPheters, Laura L. ; McLaughlin, Steven W.
Author_Institution :
San Diego State Univ., CA, USA
fDate :
1/1/2002 12:00:00 AM
Abstract :
Recent work on turbo codes applied to partial response (PR) optical recording channels has focused on unconstrained channels. In this paper, we consider the application of turbo codes to a (1,7) constrained, PR-equalized optical recording channel with digital versatile disc (DVD) parameters. The addition of a (1,7) run-length-limited (RLL) constraint requires the use of a soft RLL decoder to communicate with the turbo code. Although soft RLL decoders were previously developed for use with iterative decoding, application to a practical optical channel has not been addressed until now. Here, results on both correlated noise and media noise optical recording channel models are given for two PR targets, 1+D and 1+D+D2+D 3. We achieved coding gains of 4 to 6.3 dB over a baseline RLL-coded system. We also evaluated system performance at smaller mark sizes, and found that density gains of 17% and 22% are achievable for the two targets, respectively
Keywords :
magneto-optical recording; maximum likelihood decoding; optical disc storage; optical transfer function; partial response channels; runlength codes; transient response; turbo codes; DVD minimum mark size; Gaussian MTF; PRML magneto-optical recording; RLL-constrained system; coding gains; correlated noise channel models; digital versatile disc parameters; impulse response; media noise channel models; modulation transfer function; partial response optical recording channels; soft RLL decoder; turbo-coded optical recording channels; AWGN; DVD; Iterative decoding; Maximum likelihood decoding; Optical modulation; Optical noise; Optical pulses; Optical recording; Pulse modulation; Turbo codes;
Journal_Title :
Magnetics, IEEE Transactions on
