Title :
A high rate matched spectral null code
Author_Institution :
Adv. Dev. Labs., Sony Corp., Tokyo, Japan
fDate :
7/1/1998 12:00:00 AM
Abstract :
A new method to construct a sliding-block matched spectral null (MSN) code with a high code rate above 0.8 for the partial response class IV (PR4) channel is described. The method partially prunes a running digital sum (RDS) trellis in a novel manner, and is approximately 1.5 times as efficient in generating available codewords compared to a conventional RDS pruning method when their digital sum variations (DSV) are the same. Simulated results with Lorentzian channels showed that practical codes with rates of 12/14 and 24/27 constructed using this method had coding gains of approximately 1 dB and 1.5 dB, respectively, in their signal-to-noise ratio (SNR) compared with the conventional code with a rate of 12/15 at a user bit density of 2
Keywords :
block codes; magnetic recording; partial response channels; trellis codes; 1 dB; 1.5 dB; Lorentzian channels; code rate; coding gains; digital sum variations; matched spectral null code; partial response class IV channel; running digital sum trellis; signal-to-noise ratio; sliding-block code; user bit density; Convolutional codes; Detectors; Laboratories; Signal to noise ratio;
Journal_Title :
Magnetics, IEEE Transactions on
