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Very Efficient 6-ary Runlength-Limited Code Approaching Shannon Capacity for Optical Storage Channels  

Jhee, Yoon-Kyoo (Dept. of Information Electronics Engineering, Ewha Womans University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.45, no.3, 2008 , pp. 29-35 More about this Journal
Abstract
Very efficient 6-ary runlength-limited codes for a six-level optical recording channel are presented when d = 3. The 6-ary(3, 15) code of rate 6/7 is given achieving coding efficiency of 98.87%. The efficiency of rate 13/15, (3, 20) code is 99.95%, which approaches the Shannon capacity. To increase the accurary of reading 6-ary signal, partial response modes are also investigated.
Keywords
code efficiency; Shannon capacity; optical recording; runlength-limited code;
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