The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 18, 2004
Filed:
Dec. 27, 2000
Mikael Isaksson, Lulea, SE;
Magnus Johansson, Lulea, SE;
Lennart Olsson, Lulea, SE;
Tomas Stefansson, Lulea, SE;
Hans Ohman, Lulea, SE;
Gunnar Bahlenberg, Lulea, SE;
Anders Isaksson, Lulea, SE;
Goran Okvist, Lulea, SE;
Lis-Marie Ljunggren, Lulea, SE;
Daniel Bengtsson, Lulea, SE;
Sven-Rune Olofsson, Lulea, SE;
Joachim Johansson, Lulea, SE;
Per Ola Borjesson, Morrum, SE;
Niklas Grip, Lulea, SE;
Richard Nilsson, Lulea, SE;
Frank Sjoberg, Lulea, SE;
Sarah Wilson, Menlo Park, CA (US);
Per Odling, Lulea, SE;
STMicroelectronics N.V., Amsterdam, NL;
Abstract
A RFI canceller, for use in a subscriber line system using multi-carrier modulation, measures a RFI disturbance in carriers falling within a band of frequencies causing the RFI. The RFI ingress into carriers outside the band of frequencies is estimated, and an error correcting signal derived from the estimation of the RFI ingress is subtracted from a received signal. The subscriber line system may be a VDSL system and the multi-carrier modulation may be DMT. The RFI canceller includes a demodulator for demodulating an incoming data stream to provide a first parallel data stream. A parallel to serial convertor converts the first parallel data stream to a first serial data stream. A digital to analogue convertor converts the first serial data stream to a first analogue signal. An analogue RFI canceller circuit combines the analogue signal with an analogue error correcting signal, to produce a second analogue signal. An analogue to digital convertor converts the second analogue signal to a second serial data signal. A serial to parallel convertor converts the second serial data stream to a second parallel data stream. A modulator modulates the second parallel data stream onto a multiplicity of carriers.