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Five runlength-limited codes for M-ary recording channels

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1 Author(s)
McLaughlin, S.W. ; Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA

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

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Magnetics, IEEE Transactions on  (Volume:33 ,  Issue: 3 )