Telephonic communications – Transmission line conditioning
Reexamination Certificate
2007-09-18
2008-11-11
Pham, Chi H (Department: 2616)
Telephonic communications
Transmission line conditioning
C379S401000, C379S402000, C379S405000, C379S399010, C379S391000, C375S258000, C375S259000, C375S268000, C375S269000, C370S314000, C370S319000, C370S321000, C370S322000, C370S330000, C370S343000, C370S344000, C370S347000
Reexamination Certificate
active
07450715
ABSTRACT:
The present invention relates to a transceiver for bidirectional frequency division multiplexed transmission, a communication system including one or more transceivers. Optionally, the communication system is a communication system for a digital subscriber line. The transceiver comprises transmission means with a voltage source output or a current source output for transmitting data in a transmission frequency range, receiving means for receiving data in a receiving frequency range, and a coupling impedance for connecting the transmission means and the receiving means to a transmission medium. The magnitude of the coupling impedance in the transmission frequency range is smaller than the magnitude of the coupling impedance in the receiving frequency range if the transmission means has a voltage source output and is higher than the magnitude of the coupling impedance in the receiving frequency range if the transmission means has a current source output. Due to the reduced magnitude or increased magnitude respectively in the transmitting frequency range, the transmit signal power requirement is reduced. In one variant of the invention, the magnitude of the coupling impedance is matched to the magnitude of the impedance of the transmission medium in order to increase the power of the received signals.
REFERENCES:
patent: 6898236 (2005-05-01), Sun
patent: 7020277 (2006-03-01), Lee et al.
patent: 901 221 (1999-03-01), None
patent: 1 220 444 (2002-07-01), None
Broadcom Corporation
Jain Raj K
Pham Chi H
Sterne Kessler Goldstein & Fox PLLC
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