MODULATION CODING WITH RLL (1, K) AND MTR (2) CONSTRAINTS.

摘要

This invention relates to a method of converting a user bitstream into a codedbitstream by means of a runlengh limited (d, k) channel code where the channelcode has a constraint of d=1. In order to ensure an improvement in bit detectionperformance an additional RMTR constraint of r=2 is imposed limiting to two themaximum number of minimum runs allowed by the d=1 constraint. An additional advantageof such a code is a limitation of the back-tracking depth of a Viterbi bit-detectorBased on two different k constraints the construction of such d=1 and r=2 codesis disclosed.