Phase-directed decision feedback equalizer

Details Phase-directed decision feedback equalizer Phase-directed decision feedback equalizer

1976-01-15

1977-05-24

Safourek, Benedict V.

Telegraphy

Systems

Alternating or pulsating current

325 42, H04L 2718

Patent

active

040257193

ABSTRACT:
A decision feedback equalizer is described wherein an approximate value .alpha..sub.0 of the phase of the signal being received at sampling time t.sub.0 is obtained by subtracting a phase error (.theta..sub.0 - .alpha..sub.0) from the value .theta..sub.0 of the phase of the signal received at t.sub.0. Value .DELTA..sub.0 is fed to a decision logic which provides an estimated value .DELTA..sub.0 of the phase of the transmitted signal, which value is representative of the detected data. Value .alpha..sub.0 is fed to a decoder which provides its components in a Cartesian coordinates system. These components are fed to the inputs of a complex, cross-coupled equalizer which supplies the approximate values .DELTA.u.sub.0 and .DELTA.v.sub.O of the components, in a Cartesian coordinates system, of the distorting signal representative of all distortions introduced by the communication channel. The phase error (.theta..sub.0 - .alpha..sub.0) is obtained from the relation

REFERENCES:
patent: 3539930 (1970-11-01), Strole
patent: 3943468 (1976-03-01), Cox et al.
patent: 3947768 (1976-03-01), Desblanche et al.
patent: 3963990 (1976-06-01), DiFonzo
patent: 3965433 (1976-06-01), Yeh

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