Title :
Five runlength-limited codes for M-ary recording channels
Author :
McLaughlin, Steven W.
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA
fDate :
5/1/1997 12:00:00 AM
Abstract :
This paper is concerned with M-ary runlength-limited (RLL) codes for nonbinary recording channels. The codes have fixed-rate finite state encoders, sliding block decoders, and large coding density. Five codes are given achieving coding densities of 24 bit/minimum-recorded-mark as compared with 1-1.5 for binary recording channels. The codes are 93-98.5% efficient and either achieve or come close to achieving the fewest number of encoder states possible. One of these codes has been implemented in a prototype system that supports M=6 discrete recording levels
Keywords :
digital magnetic recording; runlength codes; 93 to 98.5 percent; M-ary runlength-limited code; coding density; constrained code; digital recording; finite state encoder; nonbinary recording channel; sliding block decoder; Decoding; Disk recording; Magnetic recording; Modulation coding; Optical recording; Optical saturation; Optical sensors; Prototypes; Saturation magnetization; Timing;
Journal_Title :
Magnetics, IEEE Transactions on
