Adaptive phase-jitter tracker

Details Adaptive phase-jitter tracker Adaptive phase-jitter tracker

1980-03-03

1982-03-16

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

Direct sequence

375 14, 370 79, 333 18, H04B 110

Patent

active

043205267

ABSTRACT:
An adaptive phase-jitter compensator, which is frequency selective, is disclosed for use in data receivers. The filter section (28) of the adaptive compensator receives a derived phase error signal and its own weighted sum output to provide the difference between them as selective noisy estimates of the actual phase via taps of a delay line (52-1 to 52-L). A multiplier (57) accepts each tap signal and the phase error to form a product used to update the coefficients or tap weights used in the filter section. An upmodulator (29) impresses the weighted sum output on a carrier signal whose output is used by a lookup table (31) to form components to be compatible with the received data signal. A complex multiplier, (23), multiplies the components and the data signal which has been previously split into components and equalized, to provide both demodulation and phase-jitter compensation.

REFERENCES:
patent: 3878468 (1975-04-01), Falconer
patent: 3935535 (1976-01-01), Motley
patent: 3943448 (1976-03-01), Motley
patent: 4021738 (1977-05-01), Gitlin
patent: 4061977 (1977-12-01), Motley
patent: 4061978 (1977-12-01), Motley
Bell System Technical Journal vol. 55, No. 3, Mar. 1976, Jointly Adaptive Equalization and Carrier Recovery in Two Dimensional Digital Communication System DD Falconer, pp. 317-334.

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