Carrier tracking technique and apparatus having automatic flywhe

Details Carrier tracking technique and apparatus having automatic flywhe Carrier tracking technique and apparatus having automatic flywhe

1996-02-01

1998-10-27

Chin, Stephen

Pulse or digital communications

Receivers

Angle modulation

375326, 375354, 375355, 375324, 375316, 375322, H04L 2714, H04L 2716, H04L 2722

Patent

active

058287051

ABSTRACT:
The carrier tracking loop technique and apparatus provides smooth, accurate frequency tracking, fast reacquisition and doppler tracking over a wide dynamic range. The loop parameters of the carrier tracking loop are varied as a function of mode, i.e. flywheel, tracking or reacquisition modes. The various modes of operation are automatically detected and loop operation is enhanced by non-linear techniques. The enhancements include fourth power sample normalization to improve performance over a large dynamic range and to ease fixed point scaling. A slope limiter is included which aids in coherent detection by reducing phase noise introduced by the carrier tracking loop. Also, a predifferentiation filter further aids in coherent detection by reducing phase noise.

REFERENCES:
patent: 4785463 (1988-11-01), Janc et al.
patent: 5541965 (1996-07-01), Daffara
patent: 5566214 (1996-10-01), Kroeger et al.
patent: 5579345 (1996-11-01), Kroeger et al.
patent: 5644606 (1997-07-01), Martinez et al.
patent: 5684842 (1997-11-01), Daffara
patent: 5696797 (1997-12-01), Bucher et al.
patent: 5699385 (1997-12-01), D'Sylva et al.

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