Efficient Encoding of a Class of Maximum-Transition-Run and PRML Codes
نویسنده
چکیده
A large class of maximum-transition-run (MTR) block codes is presented that is based on a novel lowcomplexity enumerative encoding scheme. This new class of MTR codes is obtained by a general design method to construct capacity-efficient MTR codes with predetermined j and k constraints and reduced error propagation at the decoder. Typically, these codes are designed to improve the distance properties of a generalized partial-response detector trellis. Another way to use MTR codes consists in applying even/odd interleaving to construct long high-rate PRML(G,I,M) modulation codes that satisfy tight global G = 2k and interleaved I = k constraints. Furthermore, these (G,I) constrained codes satisfy the M = 2j constraint, i.e., they have limited runs of alternating 2T magnets at the channel input.
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