Pulse or digital communications – Systems using alternating or pulsating current – Antinoise or distortion
Reexamination Certificate
2006-09-26
2006-09-26
Phu, Phoung (Department: 2631)
Pulse or digital communications
Systems using alternating or pulsating current
Antinoise or distortion
C375S296000, C375S346000, C375S222000, C375S257000
Reexamination Certificate
active
07113549
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.
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Bahlenberg Gunnar
Bengtsson Daniel
Isaksson Mikael
Johansson Magnus
Nilsson Rickard
Jorgenson Lisa K.
Morris James H.
Phu Phoung
STMicroelectronics NV
Wolf Greenfield & Sacks P.C.
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