Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1992-12-17
1995-01-17
Chin, Stephen
Pulse or digital communications
Spread spectrum
Direct sequence
375107, 375113, 3701051, 370105, H04L 700
Patent
active
053832256
ABSTRACT:
A synchronizer operates to achieve initial synchronization with a TDMA acquisition signal exhibiting a potentially large Doppler. The synchronizer collects samples of a baseband signal during a timing window. A fast Fourier transform (FFT) is performed on the samples to generate a set of spectral data. The window is moved to an identical point in a subsequent frame and the FFT repeated until a high-confidence spectral data set is obtained. If the spectral data set indicates energy concentrated around a discrete frequency, then that discrete frequency represents an estimate of the acquisition signal's frequency. The timing window's timing parameters represent a time slot estimate of the acquisition signal. If the spectral data set indicates energy spread more or less uniformly over the spectrum, then no estimates are indicated and a new window is positioned at a different point in subsequent frames.
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Aguirre Sergio
Keate Christopher R.
Vatt Gregory B.
Chin Stephen
Gorrie Gregory J.
Handy Robert M.
Le Amanda T.
Motorola Inc.
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