System for evaluating transmission line impairments

Details System for evaluating transmission line impairments System for evaluating transmission line impairments

1981-10-28

1985-03-05

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375101, 364574, H04B 1502

Patent

active

045035458

ABSTRACT:
A data communication system which includes a transmitter and a receiver is used in QAM or PSK modulation. The receiver provides a signal space pattern wherein each point is defined in a coordinate system in which a first axis is the in-phase channel axis and a second axis is the quadrature channel axis in the signal space diagram. Additionally, the receiver determines the parameters for reducing the intersymbol interference of the received signal.

REFERENCES:
patent: 3611149 (1971-10-01), Kimball
patent: 3688196 (1972-08-01), Doelz
patent: 3988539 (1976-10-01), Motley et al.
patent: 4032847 (1977-06-01), Unkauf
patent: 4035625 (1977-07-01), Chiu et al.
patent: 4114710 (1978-09-01), Katoh et al.

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