Ensemble modem structure for imperfect transmission media

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

1989-06-15

1991-10-01

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375118, 370 941, 370108, H04B 138, H04B 350, H04L 516

Patent

active

050540343

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 for tracking variations in line parameters are disclosed.

REFERENCES:
patent: 4438511 (1984-03-01), Baran
patent: 4679227 (1987-07-01), Hughes-Hartogs
patent: 4731816 (1988-02-01), Hughes-Hartogs
patent: 4794620 (1988-12-01), Moore et al.
patent: 4833696 (1989-05-01), Ichiyoshi
patent: 4852122 (1989-07-01), Nelson et al.
Gallagher, "Information Theory and Reliable Communications", pp. 383-431, John Wiley & Sons, New York, 1968.

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