DocumentCode :
1346463
Title :
The performance of generalized maximum transition run trellis codes
Author :
Bliss, William G. ; She, Sian ; Sundell, Lisa C.
Author_Institution :
Cirrus Logic Inc., Broomfield, CO., USA
Volume :
34
Issue :
1
fYear :
1998
fDate :
1/1/1998 12:00:00 AM
Firstpage :
85
Lastpage :
90
Abstract :
There has been considerable recent activity in the design and implementation of codes for magnetic saturation recording which achieve a 2.2 dB gain on the ideal EEPR4 partial response channel. This paper compares the performance of one such 8/9 rate Generalized Maximum Transition Run (GMTR) code with a normal 16/17 rate RLL(0,k) code. The sensitivity of the comparison is considered for two idealized magnetic dipulse shapes, for two idealized signal sampling techniques, and for two idealized noise environments. Comparison of a blended Lorentzian and Gaussian dipulse to a pure Lorentzian show generally similar gross effects, but the blended dipulse shows the onset of high density effects at lower channel densities. Comparison of the ideal minimum bandwidth discrete time equivalent sampler to the ideal whitened matched filter sampler shows negligible differences. The GMTR code in Additive White Gaussian Noise (AWGN) achieves net coding gains from 0.2 to 1.7 dB on user densities from 2 to 3 depending on the sequence detector target. In a media noise model the GMTR code is shown to achieve significant coding gains with the EEPR4 or MLSD detector targets
Keywords :
Gaussian noise; magnetic recording; magnetic recording noise; partial response channels; runlength codes; signal sampling; trellis codes; white noise; 0.2 to 1.7 dB; 2.2 dB; EEPR4 partial response channel; Gaussian pulse; Lorentzian pulse; MLSD detector; RLL code; additive white Gaussian noise; discrete time equivalent sampler; generalized maximum transition run trellis code; magnetic dipulse shape; magnetic saturation recording; sequence detector; signal sampling; whitened matched filter sampler; AWGN; Additive white noise; Convolutional codes; Detectors; Gain; Gaussian noise; Magnetic recording; Partial response channels; Saturation magnetization; Shape;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/20.663455
Filename :
663455
Link To Document :
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