Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via frequency channels
Reexamination Certificate
2005-06-28
2005-06-28
Pezzlo, John (Department: 2662)
Multiplex communications
Communication techniques for information carried in plural...
Combining or distributing information via frequency channels
C370S430000, C375S222000
Reexamination Certificate
active
06912233
ABSTRACT:
For synchronization purposes, a transmitter (TX) multiplexes a pilot carrier with carriers whereon data elements (DATA) are modulated, and transmits the pilot carrier together with the modulated carriers to a receiver (RX). The immunity of the pilot carrier for interferers, such as radio amateur signals, is improved by modulating the pilot carrier with a non-constant signal, for instance a random signal, an alternating signal or even scrambled data elements (DATA), before transmission thereof. Since demodulation of the pilot carrier in the receiver (RX) and averaging successive demodulated pilot carriers reduces the effect of the interference induced on the non-constantly modulated pilot carrier, the degradation of the synchronization between transmitter (TX and receiver (RX) is reduced significantly.
REFERENCES:
patent: 5103459 (1992-04-01), Gilhousen et al.
patent: 5241544 (1993-08-01), Jasper et al.
patent: 5311541 (1994-05-01), Sanderford, Jr.
patent: 5400322 (1995-03-01), Hunt et al.
patent: 5406551 (1995-04-01), Saito et al.
patent: 5414734 (1995-05-01), Marchetto et al.
patent: 5506865 (1996-04-01), Weaver, Jr.
patent: 5546190 (1996-08-01), Hill et al.
patent: 5548344 (1996-08-01), Park
patent: 5627863 (1997-05-01), Aslanis et al.
patent: 5703873 (1997-12-01), Ojanpera et al.
patent: 5745839 (1998-04-01), Leiberman
patent: 5748677 (1998-05-01), Kumar
patent: 5751761 (1998-05-01), Gilhousen
patent: 5790514 (1998-08-01), Marchok et al.
patent: 5867528 (1999-02-01), Verbueken
patent: 5910970 (1999-06-01), Lu
patent: 5943361 (1999-08-01), Gilhousen et al.
patent: 5991308 (1999-11-01), Fuhrmann et al.
patent: 6055268 (2000-04-01), Timm et al.
patent: 6118758 (2000-09-01), Marchok et al.
“Network and Customer Installation Interfaces-Asymmetric Digital Subscriber Line (ADSL) Metallic Interface”; ANSI Standard on ADSL; TIE1.413-1995; pp. 46 and 58.
“A Multicarrier E1-HDSL Tranceiver System with Coded Modulation”; P. S. Chow et al.; Journal of European Transactions on Telecommunications and Related Technologies (ETT); pp. 257-266.
Reusens Peter Paul Frans
Spruyt Paul Marie Pierre
Van der Putten Frank Octaaf
Alcatel Alsthom Compagnie Generale d'Electricite
Ware Fressola Van Der Sluys & Adolphson LLP
LandOfFree
Modulation/demodulation of a pilot carrier, and means to... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Modulation/demodulation of a pilot carrier, and means to..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modulation/demodulation of a pilot carrier, and means to... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3521431