Method and system for detection of short digital radio messages
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United States of America Patent
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Feb 17, 2004
Grant Date -
N/A
app pub date -
Oct 5, 1999
filing date -
Oct 5, 1999
priority date (Note) -
Expired
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Abstract
Digital signals transmitted on an RF carrier modulated in phase and amplitude and subject to noise constitute separate bursts each comprising information symbols of data and a pair of separated unique words. The signals are subjected to processing which involves reception of the signals and an initial conversion to approximate baseband and then analog to digital sampling. Quadrature and in phase samples are then stored in a buffer. The buffered samples are subjected to coarse timing, coarse frequency synchronization, a first phase correction, fine timing, further phase and amplitude correction and finally to fine frequency correction and subsequent reliability estimation.
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