Pulse or digital communications – Repeaters – Testing
Patent
1992-04-17
1994-03-15
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375 40, 375 99, 375102, 371 681, H04K 110, H04L 2728, H04L 102, H04B 702
Patent
active
052951596
ABSTRACT:
Methodology, and associated circuitry, for encoding and decoding an incoming data stream utilize a coordinated code constellation that effects robust signal detection in the presence of channel interference. The encoder partitions the incoming data stream into contiguous data segments in proportion to the number of levels for a given coordinated code. Each data segment is mapped with reference to the coordinated code to signal levels suitable for transmission over a plurality of channels. The decoder measures the received signals on the channels and estimates noise statistics for the channels. A metric relationship engendered by the coordinated code is evaluated with reference to the received signals, estimates to the received signals, and the noise statistics. An output data stream is then generated based on the evaluation of the metric.
REFERENCES:
patent: 4821289 (1989-04-01), Peile
patent: 5181198 (1993-01-01), Lechleider
Kastoria et al., "Vector Coding With Decision Feedback Equalization For Partial Response Channels", 1988, Globelom 1988, pp. 853-857.
Forney, Jr. et al. "Multidimensional Constellations--Part I: Introduction, Figures of Merit, and Generalized Cross Constellations", Aug. 1989, IEEE Journal on Sel. Areas in Communications, vol. 7, No. 6, pp. 877-892.
"Coordinated Transmission for Two-Pair Digital Subscriber Lines", J. W. Lechleider, IEEE, vol. 9, No. 6, Aug. 1991, pp. 920-930.
"Study of the Feasibility and Advisability of Digital Subscriber Lines Operating at Rates substantially in excess of the Basic Access Rate", Bellcore, J. W. Lechleider, T1E1.4, Dec. 11, 1989, "Averaging of the Signal to Noise Ratios of the Constituent Pairs of a Two-pair DSL".
"Simple Reception Techniques for Coordinated Two-Pair Digital Transmission", D. D. Falconer and E. Arnon, IEEE Global Telecommunications Conference, Phoenix, Ariz., Dec. 2-5, 1991, vol. 1 of 3.
Bell Communications Research Inc.
Chin Stephen
Kobayashi Duane
Suchyta Leonard C.
Yeadon Loria B.
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