Digitally implemented fast frequency estimator/demodulator for l

Details Digitally implemented fast frequency estimator/demodulator for l Digitally implemented fast frequency estimator/demodulator for l

1992-08-17

1993-12-21

Grimm, Siegfried H.

Demodulators

Phase shift keying or quadrature amplitude demodulator

329310, 375 80, 375 83, 36472408, 364726, H04L 2722

Patent

active

052724468

ABSTRACT:
A low-bit-rate, low-cost, all-digital preambleless demodulator for maritime and mobile data communications operates under severe high noise conditions, fast Doppler frequency shifts, large frequency offsets, and multipath fading. Sophisticated algorithms, including an FFT-based burst acquisition system, a cycle-slip resistant carrier phase tracker, an innovative Doppler tracker, and a fast acquisition symbol synchronizer, provide reliable burst reception. The compact DSP-based demodulator includes an input buffer receiving a complex sampled baseband input signal and providing a baseband output to a coarse frequency estimator fast Fourier transform (FFT) or discrete Fourier transform (DFT) module which produces a first estimation of the carrier frequency. A fine frequency estimator FFT or DFT module receives the first estimation and provides a second estimation of the carrier frequency. An extra coarse frequency estimator FFT or DFT module may be provided between the buffer and the coarse frequency estimator.

REFERENCES:
patent: 3758870 (1973-09-01), Schmitt et al.
patent: 4245325 (1981-01-01), Kikuchi et al.
patent: 4466108 (1984-08-01), Rhodes
patent: 4912422 (1990-03-01), Kobayashi et al.

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