Ensemble modem structure for imperfect transmission media

Details Ensemble modem structure for imperfect transmission media Ensemble modem structure for imperfect transmission media

1988-01-05

1989-05-23

Ng, Jin F.

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

370 19, 375 39, H04M 1100

Patent

active

048337064

ABSTRACT:
A high-speed modem that transmits and receives digital data on an ensemble of carrier frequencies spanning the usable band of a dial-up telephone line. The modem includes a system for variably allocating data and power among the carriers to compensate for equivalent noise and to maximize the data rate. Additionally, systems for eliminating the need for an equalization network, for adaptively allocating control of a channel, and the tracking variations in line parameters are disclosed.

REFERENCES:
patent: 4206320 (1980-06-01), Keasler et al.
patent: 4438511 (1984-03-01), Baran
"Information Theory and Reliable Communication", R. Gallager, John Wiley & Sons, New York 1968, pp. 383-431.

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