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:
Sep. 26, 2006
Filed:
Feb. 17, 1999
Mikael Isaksson, Luleå, SE;
Daniel Bengtsson, Luleå, SE;
Frank Sjöberg, Luleå, SE;
Per Ödling, Luleå, SE;
Rickard Nilsson, Luleå, SE;
Gunnar Bahlenberg, Luleå, SE;
Magnus Johansson, Luleå, SE;
Lennart Olsson, Luleå, SE;
Göran Ökvist, Luleå, SE;
Mikael Isaksson, Luleå, SE;
Daniel Bengtsson, Luleå, SE;
Frank Sjöberg, Luleå, SE;
Per Ödling, Luleå, SE;
Rickard Nilsson, Luleå, SE;
Gunnar Bahlenberg, Luleå, SE;
Magnus Johansson, Luleå, SE;
Lennart Olsson, Luleå, SE;
Göran Ökvist, Luleå, SE;
STMicroelectronics NV, Amsterdam, NL;
Abstract
Zipper is the time-synchronized frequency-division duplex implementation of discrete multi-tome (DMT) modulation. Two communicating Zipper modems transmit DMT symbols simultaneously with a common clock. When all transmitters are time synchronized, the near end cross-talk (NEXT) and near end echoes injected into the received signal are orthogonal to the desired signal. The present invention provides a telecommunications transmission system using zipper and having at least two VDSL systems. Each VDSL system comprises a pair of zipper modems communicating over a cable transmission path. The telecommunications transmission system handles zipper transmission transmitted over the common cable; at least partly mitigates NEXT; and permits transmissions in a first VDSL system which are asynchronous with transmissions in a second VDSL system.