Quadriphase shift keyed adaptive equalizer

Details Quadriphase shift keyed adaptive equalizer Quadriphase shift keyed adaptive equalizer

1976-11-26

1977-10-11

Safourek, Benedict V.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

333 18, H03H 736

Patent

active

040538370

ABSTRACT:
A quadriphase shift keyed (QPSK) adaptive equalizer includes baseband inphase (I) and quadrature (Q) adaptive filters for receiving demodulated OPSK signals. The I and Q channel filters are designed to operate independent of each other and adapt their characteristics continuously in a predetermined manner in response to an incoming received QPSK signal, distorted in an unknown time varying manner.

REFERENCES:
patent: 3400332 (1968-09-01), O'Neill, Jr. et al.
patent: 3755738 (1973-08-01), Gitlin et al.
patent: 3878468 (1975-04-01), Falconer et al.
patent: 3906347 (1975-09-01), Motley et al.
patent: 3914691 (1975-10-01), Meadors, Jr.
patent: 3947768 (1976-03-01), Desblache et al.

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