High speed quantization-level-sampling modem with equalization a

Details High speed quantization-level-sampling modem with equalization a High speed quantization-level-sampling modem with equalization a

1994-01-03

1996-06-18

Coles, Sr., Edward L.

Pulse or digital communications

Transceivers

Modems

375268, 375353, 375219, 379 93, H04L 516, H04L 2702, H03K 702, H04B 138

Patent

active

055286259

ABSTRACT:
The present invention is a quantization-level-sampling (QLS) modem which includes means for separately equalizing each loop of an end-to-end digital telephone system network connection by employing a plurality of transmitter filters and a plurality of receiver filters in such a way that, in the direction of transmission from modem to central office, the voltage samples seen by the coder/decoder stations are equivalent to the network quantization levels transmitted by the modem, and in the direction of transmission from central office to modem, the voltage samples seen by the modem are equivalent to the network quantization levels encoded by the coder/decoder stations. The invention also includes a QLS modem communications system which includes the aforesaid digital telephone system network and a plurality of QLS modems. In preferred embodiments, an adaptation service unit within the telephone system network assists in the determination of the settings of the transmitter and receiver filters.

REFERENCES:
patent: 3795865 (1974-04-01), Armstrong
patent: 4037160 (1977-07-01), Miloradovic et al.
patent: 4227250 (1980-10-01), Wyner
patent: 4367456 (1983-01-01), Munter
patent: 5115450 (1992-05-01), Arcuri
B. R. Peterson and D. D. Falconer, "Minimum Mean-Square Equalization in Cyclostationary and Stationary Interference-Analysis and Subscriber Line Calculations", IEEE JSAC, vol. SAC-9, No. 6, pp. 931-940.

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