Asymmetric digital subscriber loop transceivers

Details Asymmetric digital subscriber loop transceivers Asymmetric digital subscriber loop transceivers

1997-10-17

2000-02-29

Chin, Stephen

Pulse or digital communications

Transceivers

Modems

375219, 375220, H04B 138, H04L 516

Patent

active

060318686

ABSTRACT:
An asymmetrical modem system wherein a modem at a first location transmits information to a modem at a second location on a downstream signal and the modem at the second location transmits information to the modem at the first location on an upstream signal. The system includes a first location transmitter section, having an N-point inverse frequency transform, for converting information into the downstream signal having up to (N/2)-1 carriers. A second location transmitter section having, an [(NL)/(2K)-point inverse frequency transform, converts information into the upstream analog signal having up to [(NL)/(2K)]-1 carriers, where K is the ratio of downstream signal bandwidth to upstream signal bandwidth and L is greater one. A receiver section at the first location, having an [NM/K]-point frequency transform, separates the upstream signal into up to [(NM)/(2K)]-1 upstream carriers, where M is greater than one. A receiver section at the second location, having an N-point frequency transform, separates the downstream analog signal into up to (N/2)-1 downstream carriers.

REFERENCES:
patent: 5317596 (1994-05-01), Ho et al.
patent: 5557612 (1996-09-01), Bingham
patent: 5790514 (1998-08-01), Marchok et al.
patent: 5909463 (1999-06-01), Johnson et al.
Younce et al. "Echo Cancellation For Asymmetrical digital Subscriber Lines", Serving Humanity Through Commu-cations, Supercomm/ICC, New Orleans, May 1994, IEEE, vol. 1, pp 301-306.
"ADSL-Modems", Funkschau, vol. 1, No. 6, Feb. 28, 1997, pp 44-47.
PCT Search Report Mailed May 17, 1999 in Connection with Counterpart application PCT/US 98/21698.

Affiliated with

Also associated with

Rating

Asymmetric digital subscriber loop transceivers does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Asymmetric digital subscriber loop transceivers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Asymmetric digital subscriber loop transceivers will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-689741