Data transmission systems

Pulse or digital communications – Repeaters – Testing

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

371 43, H03D 100

Patent

active

044843380

ABSTRACT:
A method and apparatus for decoding received data signals using a Viterbi algorithm. To reduce the time required to decode a data signal, the system expands k received data vectors into nk vectors where n is smaller than m, m being the number of levels of the received data signal. Thereafter, k vectors are chosen from the nk expanded vectors and a "cost", defined herein is determined for each of said k vectors. The most likely identity of the received data signal is then determined on the basis of the computed costs.

REFERENCES:
patent: 4130818 (1978-12-01), Snyder, Jr.
patent: 4171516 (1979-10-01), Challen et al.
patent: 4240156 (1980-12-01), Doland
patent: 4293953 (1981-10-01), Gutleber
A Reduced State Variant of Maximum Likelihood Sequence Detection Attaining Optimum Performance for High Signal-to-Noise Ratios; Foschini; IEEE Transactions on Information Theory; vol. IT-23, No. 5, Sep. 1977; pp. 605-609.
Near-Maximum-Likelihood Detection Processes for Distorted Digital Signals; Clark et al.; The Radio and Electronic Engineer; vol. 48, No. 6, pp. 301-309, Jun. 1978.
Detection Processes for Severely Distorted Digital Signals; Clark et al.; Electronics Circuits and Systems, Jan. 1979, vol. 3, No. 1, pp. 27-37.
Adaptive Maximum-Likelihood Sequence Estimation for Digital Signaling in the Presence of Intersymbol Interference; Magee, Jr. et al.; IEEE Transactions on Information Theory, Jan. 1973; pp. 120-124.
Estimation of the Sampled Impulse-Response of a Channel; Clark et al.; Signal Processing 2 (1980), pp. 39-53; North Holland Publishing Company.
Detection of Distorted q.a.m. Signals; Clark et al., Electronic Circuits and Systems, Apr. 1977, vol. 1, No. 3, pp. 103-109.
Clark, A. P., "Principles of Digital Data Transmission" Pentech Press, London 1976, pp. 223-359, (Reference 1).
Clark, A. P., "Advanced Data-Transmission Systems" Pentech Press, London 1977, pp. 47-85, (Reference 5).
Feedback Equalization for Fading Dispersive Channels; Monsen; IEEE Transactions on Information Theory, Jan. 1971, pp. 56-64.
An Experimental Adaptively Equalized Modem for Data Transmission over the Switched Telephone Network; The Radio and Electronic Engineer; vol. 42, No. 11, Nov. 1972, pp. 499-507.
Linear and Non-Linear Transversal Equalizers for Baseband Channels; Clark et al., The Radio and Electronic Engineer, vol. 45, No. 6, Jun. 1975, pp. 271-283.
Maximum-Likelihood Sequence Estimation of Digital Sequences in the Presence of Intersymbol Interference; Forney, Jr.; IEEE Transactions on Information Theory, vol. IT-18, No. 3, May 1972; pp. 363-378.
The Viterbi Algorithm; Forney, Jr.; Proceedings of the IEEE, vol. 61, No. 3, Mar. 1973; pp. 268-278.
An Adaptive Receiver for Data Transmission over Time-Dispersive Channels; Qureshi et al.; IEEE Transactions on Information Theory, vol. IT-19, No. 4, Jul. 1973; pp. 448-457.
Adaptive Channel Memory Truncation for Maximum Likelihood Sequence Estimation; Falconer et al.; The Bell System Technical Journal; vol. 52, No. 9, Nov. 1973, pp. 1541-1562.
Further Results on the Viterbi Algorithm Equalizer; Cantoni et al.; IEEE Transactions on Information Theory, Nov. 1974; pp. 764-767.
Optimal Short Desired Impulse Response for Maximum Likelihood Sequence Estimation; Desblache; IEEE Transactions on Communications, Jul. 1977; pp. 735-738.

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

Data transmission systems does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Data transmission systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Data transmission systems will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2193922

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