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Maximum Transition Run (MTR) Codes At linear bit densities around 2.5 bits/PW50 and higher, the BER performance of
near-optimal sequence detectors is dominated by errors in which the actual and
detected data (normalized to +/-1) differ by +/-(2,-2,2). At least one of
the patterns in each actual/detected data pair contains three or more
consecutive transitions. MTR codes improve the performance of these detectors
by constraining the maximum number of consecutive transitions in the written
magnetization pattern to two. In detectors such as
FDTS/DF
and E2PRML,
MTR coding has produce a gain of 1-2 dB over the RLL(0,k) coded channel. We
have developed specific block and sliding-block codes based on the MTR constraint
with rates ranging from 4/5 to 6/7. Because the MTR code may also find application
in magnetic tape recording, where the DC spectral components must be suppressed,
DC-Free MTR codes have also been developed. For more information see
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