Adaptive jitter canceller having sinusoidal accentuator and jitt

Details Adaptive jitter canceller having sinusoidal accentuator and jitt Adaptive jitter canceller having sinusoidal accentuator and jitt

1988-01-27

1988-12-20

Griffin, Robert L.

Pulse or digital communications

Spread spectrum

Direct sequence

375 12, 364574, H04L 700

Patent

active

047929642

ABSTRACT:
A signal representative of the carrier phase of a received digitally modulated signal is supplied to a first low-pass filter for band-limiting frequencies of the carrier phase signal below 1/(2NT), where N is an integer equal to or greater than two and T is a unit delay time. The band-limited signal is sampled at intervals NT and fed to a digital sinusoidal accentuator for accentuating the signal at intervals NT. An interpolator converts the output of accentuator to a series of samples spaced at intervals 1/T by inserting zero-bit samples between adjacent input samples. A second low-pass filter band-limits the frequencies of the output of the interpolator below 1/(2NT). A prediction filter receives the output of the second low-pass filter to produce a cancelling signal which is combined with the received signal to cancel the phase jitter.

REFERENCES:
patent: 4004226 (1977-01-01), Qureshi et al.
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patent: 4412341 (1983-10-01), Gersho et al.
patent: 4458355 (1984-07-01), Motley et al.
patent: 4481645 (1984-11-01), Karabinis
patent: 4541101 (1985-09-01), Potage et al.
patent: 4627080 (1986-12-01), Debus, Jr.
patent: 4639939 (1987-01-01), Hirosaki et al.
patent: 4694468 (1987-09-01), Cullum

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