Error tracking loop incorporating simplified cosine look-up tabl

Details Error tracking loop incorporating simplified cosine look-up tabl Error tracking loop incorporating simplified cosine look-up tabl

1994-12-30

1996-07-02

Chin, Stephen

Pulse or digital communications

Receivers

Interference or noise reduction

H04L 100, H04L 2508

Patent

active

055330711

ABSTRACT:
A circuit for error correcting a received complex data signal comprises a synchronous detector for recovering an in-phase data component from the received signal and a Hilbert transform filter for estimating the related quadrature component from the recovered in-phase data component, the recovered in-phase data component including a periodically recurring reference signal. A decision feedback loop is periodically operable in response to the reference signal for initially error correcting a selected characteristic of the received signal at a first relatively rapid rate and for subsequently error correcting the selected characteristic at a rate which is less than the first rate and which is dependent upon the estimated S/N ratio of the received signal. In one embodiment, phase errors are corrected at a rate which is also directly related to the value of the estimated quadrature component. In another embodiment, amplitude errors, e.g. gain and offset, are corrected at a rate which is inversely related to the value of the estimated quadrature component.

REFERENCES:
patent: 3800228 (1974-03-01), Acker
patent: 3849730 (1974-11-01), Yu-Shang-Ho
patent: 4947409 (1990-08-01), Raith
patent: 5157697 (1992-10-01), Anvari
patent: 5177611 (1993-01-01), Gibson
patent: 5260974 (1993-11-01), Johnson

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