Reduced complexity EPR4 post-processor for sampled data detectio

Pulse or digital communications – Receivers – Particular pulse demodulator or detector

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

375263, 375290, 371 43, 360 65, H03D 100

Patent

active

055219454

ABSTRACT:
An EPR4 detector comprises a PR4 Viterbi detector and an EPR4 post-processor for improving estimated output sequence at an output of the PR4 Viterbi. The PR4 Viterbi detector produces digital estimates of coded digital information values into the channel in accordance with a path through a PR4 trellis and produces other path information relating to other paths through the PR4 trellis. The EPR4 post-processor has a PR4 path storage circuit for receiving and storing the estimated sequence of coded digital information values which corresponds to a PR4 path through a sequence of states of an EPR4 trellis; an error-event selection circuit for receiving the other path information from the PR4 Viterbi detector for generating non-overlapping error-events from a set of error-events deviating from the PR4 path through the EPR4 trellis stored in the PR4 path storage circuit, and a path correction circuit connected to the PR4 path storage circuit and to the error-event selection circuit for correcting non-overlapping error-events deviating from the PR4 path through the EPR4 trellis, and for putting out a corrected estimated sequence of coded digital information values. An EPR4 detection method is also disclosed.

REFERENCES:
patent: 5341387 (1994-08-01), Nguyen
patent: 5408503 (1995-04-01), Kahlman
patent: 5430468 (1995-07-01), Minuhin et al.
Wood, Peterson, "Viterbi Detection of ClassIV Partial Response on a Magnetic Recording Channel," IEEE Tran. May 1986 pp. 454-461.
Knudson, Wolf and Milstein, "Dynamic Threshold Implementation of the Maximum Liklihood Detector for the EPR4 Channel", IEEE GlobeCom '91 Conf. Record, vol. 3, GlobeCom, Phoenix, AZ, Dec. 1991, pp. 60B.1.1-60B.1.5.
Knudson, Wolf and Milstein, "A Concatenated Decoding Scheme for (1-D) Partial Response With Matched Spectral-Null Coding", IEEE GlobeCom '93 Conf. Record, Globe Com, Houston, Texas, Nov. 29-Dec. 2, 1993, pp. 1960-1964.
Wood, "Turbo-PRML: A Compromise EPRML Detector", IEEE Transactions of Magnetics, vol. 29, No. 6, Nov. 1993.
Forney, "The Viterbi Algorithm", Proceedings of the IEEE, vol. 61, No. 3, Mar. 1973, pp. 268-2278.
Forney, "Maximum-Liklihood Sequence Estimation of Digital Sequence in the Presence of Inteersymbol Interference", IEEE Tranactions on Information Theory, vol. IT-18, No. 3, May 1972.
U.S. patent application Ser. No. 08/497,182 filed Jun. 30, 1995, for: "A Rate 16/17 (d.dbd.0, G.dbd.6/I.dbd.7) Modulation Code for a Magnetic RecordingChannel".

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Reduced complexity EPR4 post-processor for sampled data detectio does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Reduced complexity EPR4 post-processor for sampled data detectio, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reduced complexity EPR4 post-processor for sampled data detectio will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-793246

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.