Time-varying Viterbi detector for control of error event length

Details Time-varying Viterbi detector for control of error event length Time-varying Viterbi detector for control of error event length

1992-04-15

1994-01-18

Beausoliel, Jr., Robert W.

Excavating

371 43, 371 44, G06F 1120, H03M 1312

Patent

active

052804895

ABSTRACT:
A method and apparatus for detecting spectral null sequences of a spectrally-constrained code on a noisy communications channel. From a Viterbi detector with a trellis structure comprising a plurality of states and edges, predetermined ones of the states and edges in the trellis structure are deleted at preselected times modulo N, such as times .phi. modulo N and/or at intermediate times m modulo N, where m=.phi., thereby to create a time-varying trellis structure for limiting the maximum length of dominant error events. The deleted edges are generally those edges which would have entered or emanated from the deleted states if they were not deleted. The trellis structure may be a so-called systolic structure, in which case the spectral null sequences are preferably DC-free or Nyquist free.

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