Joint decision feedback equalization and carrier recovery adapta

Details Joint decision feedback equalization and carrier recovery adapta Joint decision feedback equalization and carrier recovery adapta

1975-03-21

1976-08-10

Griffin, Robert L.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

325 42, 333 18, 333 28R, H04B 116

Patent

active

039744493

ABSTRACT:
An adaptive feedforward transversal equalizer acting jointly with a data decision-directed demodulating carrier recovery system to achieve substantially jitter-free passband equalization of a suppressed-carrier coherent data signal without the use of pilot tones is improved by adding a feedback transversal filter section operating on past demodulated data symbols. The weighted output of the feedback section is subtracted from the demodulated output output of the feedforward section to provide signals from which data decisions are made and common error signals are derived. Tap-gain coefficients for both feedforward and feedback filter sections and phase angle for the demodulating carrier recovery system are adaptively updated in accordance with the common error signal. Severe frequency offset and phase jitter are simultaneously compensated.

REFERENCES:
patent: 3375473 (1968-03-01), Lucky
patent: 3581207 (1971-05-01), Chang
patent: 3715665 (1973-02-01), Chang
patent: 3755738 (1973-08-01), Gitlin et al.
patent: 3787762 (1974-01-01), Sato
patent: 3875515 (1975-04-01), Stuart et al.
patent: 3878468 (1975-04-01), Falconer et al.
patent: 3879664 (1975-04-01), Monsen
D. D. Falconer, "Theory of Minimum Mean-Square Error QAM Systems Employing Decision Feedback Equalization," Bell System Technical Journal, (1973), pp. 1821-1849.

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