Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via frequency channels
Reexamination Certificate
2006-04-25
2006-04-25
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
07035288
ABSTRACT:
For synchronisation 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 averageing successive demodulated pilot carriers reduces the effect of the interference induced on the non-constantly modulated pilot carrier, the degradation of the synchronisation between transmitter (TX) and receiver (RX) is reduced significantly.
REFERENCES:
patent: 6044107 (2000-03-01), Gatherer et al.
patent: 6055268 (2000-04-01), Timm et al.
“American National Standard for Telecommunications—Network and Customer Installation Interfaces—Asymmetric Digital Subscriber Line (ADSL) Metallic Interface;” American National Standards Institute; ANSI TI.431-1995; pp. 46 and 58.
“A Multicarrier E1-HDSL Transceiver System with Coded Modulation;” Peter S. Chow, et al; vol. 4, No. 3, May-Jun. 1993.
Reusens Peter Paul Frans
Spruyt Paul Marie Pierre
Van Der Putten Frank Octaaf
Alcatel
Fressola Alfred A.
Pezzlo John
Ware Fressola Van Der Sluys & Adolphson LLP
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