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4-ary (1,2) run-length limited code for optical storage channels

4-ary (1,2) run-length limited code for optical storage channels

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A 4-ary run-length limited (RLL) code with minimum run-length constraint d = 1 and maximum run-length constraint k = 2 is presented. The proposed code can be represented by a finite state diagram with two states. This is the lowest number of states necessary for representing the code yet presented. A simple docoding rule for the code is also introduced and a scheme for reducing the DC content of the coded sequence in the sense of multilevel running digital sum (RDS) is discussed.

References

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      • Ishida, T., Shoji, M., Miyabata, Y., Shibata, Y., Ohno, E., Ohara, S.: `High densitymark edge recording on a phase change rewritable disk by a 680-nm laser diode', Proc. SPIE(Optical Data Storage '94), 1994, 2338, p. 121–126.
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      • Gerpheide, J., Jain, A.: `Symbol discriminator for high density multilevel recording', Proc. SPIE (Optical Data Storage '95), 1995, 2514, p. 218–226.
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      • S.W. McLaughlin . Five runlength-limited codes for M-ary recording channels. IEEE Trans. , 3 , 2442 - 2450
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