Method and modem for adaptive allocation of the pilot carrier in

Details Method and modem for adaptive allocation of the pilot carrier in Method and modem for adaptive allocation of the pilot carrier in

1997-01-16

1999-02-02

Le, Amanda

Pulse or digital communications

Transceivers

Modems

375260, 370206, 370491, 455 59, 455 63, 455452, 455513, H04J 116

Patent

active

058675280

ABSTRACT:
In a multi-carrier system, the pilot carrier which is transmitted between two stations for synchronisation purposes, is re-allocated to a new frequency whenever it is disturbed by noise or a single frequency disturber in the vicinity thereof. A less noisy frequency is selected by means of a specific criterion to be fulfilled, for instance based on signal to noise ratio measurements performed for all carriers in the multi-carrier system.

REFERENCES:
patent: 4792984 (1988-12-01), Matsuo
patent: 5375123 (1994-12-01), Andersson et al.
patent: 5491837 (1996-02-01), Haartsen
patent: 5577022 (1996-11-01), Padovani et al.
"Asymmetric Digital Subscriber Line (ADSL) Metallic Interface Specification", American Nat'l Stds. Institute, Inc. in Apr. 1994.
"Network and Customer Installation Interfaces, Asymmetric Digital Subscriber Line (ADSL) Metallic Interface" by American Nat'l Stds. Institute, Apr. 1994.
"Performance Evaluation of a Multichannel Transceiver System for ADSL and VHDSL Services" by Chow et al. from the IEEE Journal, vol. 9, No. 6, Aug. 1991 909-919.
"A multi-carrier E1-HDSL transceiver system with coded modulation" a by Chow et al European Transactions on Telec. and Related Tech. vol. 4, No. 3, May 1993, 257-266.

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