On runlength-limited coding with DC control
نویسنده
چکیده
Constructions are presented of nite state encoders for certain d k RLL con straints with DC control In particular an example is provided for a rate encoder for the RLL constraint that requires no look ahead in decoding thus performing favorably compared to the EFMPlus code used in the DVD standard
منابع مشابه
Construction of E cient Dc-Free Runlength-Limited Codes for Optical Recording
We will report on new dc-free runlength-limited codes (DCRLL) intended for the next generation of digital versatile disc (DVD). The e ciency of the newly developed DCRLL schemes is extremely close to the theoretical maximum, and as a result, signi cant density gains can be obtained with respect to prior art coding schemes. Preferred embodiments of the codes (footprints) and respective hardware ...
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Basic trade-offs between the rate of combined DC-free runlength-limited (DCRLL) modulation codes and the amount of suppression of low-frequency components are presented. The main results are obtained by means of a numerical study of dependencies between statistical properties of ideal, ‘maxentropic’ DCRLL sequences. The numerical results are mathematically founded by proving the observed behavi...
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We present an enumerative technique for encoding and decoding dc-free runlength-limited sequences. This technique enables the encoding and decoding of sequences approaching the maxentropic performance bounds very closely in terms of code rate and low-frequency suppression capability. Use of finite-precision floating-point notation to express the weight coefficients results in channel encoders a...
متن کاملEfficient dc-free RLL codes for optical recording
We will report on new dc-free runlength-limited codes (DCRLL) intended for the next generation of DVD. The efficiency of the newly developed DCRLL schemes is extremely close to the theoretical maximum, and as a result, significant density gains can be obtained with respect to prior art coding schemes. With a newly developed DCRLL ( = 2) code we can achieve a 9% higher overall rate than that of ...
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New methods are presented to protect maximum runlength-limited sequences against random and burst errors and to avoid error propagation. The methods employ parallel conversion techniques and enumerative coding algorithms that transform binary user information into constrained codewords. The new schemes have a low complexity and are very efficient. The approach can be used for modulation coding ...
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عنوان ژورنال:
- IEEE Trans. Communications
دوره 48 شماره
صفحات -
تاریخ انتشار 2000