Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Patent
1996-11-05
1999-06-08
Pham, Chi H.
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
371 431, 341 58, H03D 100
Patent
active
059109696
ABSTRACT:
A method of decoding a sequence of samples received over a communications channel, such as a partial response channel, in which the sequence represents a length k binary bit stream encoded as a sequence of bipolar symbols comprised of q groups of L symbols, each length L group of said symbols corresponding to one of 2.sup.m subwords having a predetermined block digital sum. The decoding method makes use of the structure of the encoding method by finding, in one illustrative embodiment, for each group of L samples, the maximum likelihood path through a time varying trellis supporting the sets of subwords having predetermined block digital sums to identify said subwords; recording the state metrics and branch metrics for each path and identifying, from the metrics the maximum likelihood path, the order of concatenation of the subwords.
REFERENCES:
patent: 4888779 (1989-12-01), Karabad
patent: 5208816 (1993-05-01), Seshadri
patent: 5257273 (1993-10-01), Fredrickson
patent: 5398073 (1995-03-01), Wei
patent: 5479448 (1995-12-01), Seshadri
patent: 5485472 (1996-01-01), Fredrickson
patent: 5497384 (1996-03-01), Fredrickson et al.
patent: 5608397 (1997-03-01), Soljanin
J. W. Rae, G. S. Christiansen, P. Siegel, R. Karabad, H. Thapar and S. Shih, "Design and Parformance of a VLSI 120 Mb/s Trellis-Coded Partial Response Channel", IEEE Transactions on Magnetic, vol. 31, No. 2, Mar. 1995.
L. Frederickson, R. Karabed, J. W. Rae, P. H. Siegel, H. Thapar, and R. Wood, "Improved trellis coding for partial response channels," IEEE Trans. Magn., vol. 31, No. 2, pp. 1141-1148, Mar. 1995.
K. J. Knudson, J. K. Wolf and L. B. Milstein, "A concatenated decoding scheme for (l-D) partial response with matched spectral-null decoding", Proc. 1993 IEEE Global Telecommun. Conf. (Globecom '93), Houston, TX, Nov. 1993, pp. 1960-1964.
G. Forney, Jr, "Multidimensional Constallations--Part I: Introduction, Figures of Merit, and Generalozed Cross Constellations", IEEE Journal on Selected Areas in Communications, vol. 7, No. 6, Aug. 1989.
A. R. Calderbank and N.J.A. Sloan "New Trellis Codes Based on Lattices and Cosets", IEEE Transactions on Information Theory, vol. IT-33, No. 2, Mar. 1987.
Tsie et al, "Concatenated Trellis-Coded 8-Ary PSK for Land Mobile Satellite Communications" ICC'92, pp. 0778-0782 1992.
G. Ferland, Modelling of a Trellis Decoder used as Inner Code in a concatenated coding system, CCECE/CCGEI pp. 259-26 1993.
Agazzi et al., Trellis-Based Postprocessing of Viterbi Decision for Noise Decorrelation and Compensation of Nonlinear Distorion, 1995 IEEE International Conference on Commuiniciations vol. 1, pp. 566-572, 1996.
Cherubini et al., "Concatenated Coding for Binary Partial-Response Channels", Proceeding of the ICC/Supercomm'94 vol. 3, p. 1789-94 1994.
Sayiner Necip
Soljanin Emina
Lucent Technologies - Inc.
Pham Chi H.
Webster Bryan
LandOfFree
Method of detecting DC-free sequences does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of detecting DC-free sequences, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of detecting DC-free sequences will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1686974