Pulse or digital communications – Equalizers – Automatic
Patent
1996-06-06
1999-01-12
Bocure, Tesfaldet
Pulse or digital communications
Equalizers
Automatic
375340, H03H 730
Patent
active
058598715
ABSTRACT:
Carrierless signals of first and second channels pass via filters having quadrature responses and are then added for transmission. A receiver uses adaptive filters which also need quadrature responses to separate the channels effectively. To accommodate misconvergence of the filters giving rise to (a) inverted responses, (b) differential delays, (c) similar or identical responses and/or (d) transposed responses, --and hence incorrect decoding: (a) the transmitter and receiver may employ different coding in each channel, (b) the receiver may calculate the group delay of its filters and correct any error, (c) the receiver may compare the filtered signals and if similar replace one filter response with a quadrature response calculated from the other and/or (d) the receiver may respond to a failure to recognize expected synchronization words by transposing the responses of the filters.
REFERENCES:
patent: 4032762 (1977-06-01), Caloyannides
patent: 4694413 (1987-09-01), Arbeiter
patent: 5027371 (1991-06-01), Sehier et al.
patent: 5056117 (1991-10-01), Gitlin et al.
patent: 5095495 (1992-03-01), Golden
patent: 5253271 (1993-10-01), Montgomery
patent: 5425057 (1995-06-01), Paff
patent: 5646957 (1997-07-01), Im et al.
patent: 5694423 (1997-12-01), Larsson et al.
Im et al, "51.84 Mb/s 16-CAP ATM LAN Standard", IEEE Journal on Selected Areas in Communications, vol. 13, No. 4, May 1995, New York, US, pp. 620-632, XP000501258.
Im et al, "Bandwidth-Efficient Digital Transmission Up to 155 Mb/s over Unshielded Twisted Pari Wiring", IEEE International Conference on Communications 1993, 23-26 May 1993, New York, US, pp. 1797-1803, vol. 3, XP000448432.
Zervos, "High-Speed Carrierless Passband Transmission Over the Local Cable Network", IEEE Global Telecommunications Conference 1990, 2-5 Dec. 1990, New York, US, pp. 1188-1195.
Sorbara et al, "Constellation Time Division Multiplexing For the 6Mb/s ADSL", IEEE International Conference on Communications 1994, 1-5 May 1994, New York, US, pp. 821-825, XP000438622.
Bocure Tesfaldet
British Telecommunications public limited company
LandOfFree
Transmitting digital signals does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Transmitting digital signals, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transmitting digital signals will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1522740