Device for detecting BPSK modulated singular words suitable for a TDMA analog modem and detection method used therein
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United States of America Patent
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Aug 20, 1996
Grant Date -
N/A
app pub date -
Jun 27, 1994
filing date -
Jun 29, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A device for recovering the carrier of a TDMA signal supplies the complex envelope of this signal on a real channel and an imaginary channel. Circuitry for offsetting the constellation of the complex envelope by .pi./4 supply a complex signal on a main channel and on an auxiliary channel. An energy detector arrangement controls a multiplexer so that it supplies to a correlator whichever of the real or imaginary channels conveys the greater energy. The correlator calculates the correlation level between the multiplexer output signal and a reference singular word. An arrangement for comparing the correlation level with a threshold value indicates detection of the singular word in the signal on the channel applied to the correlator.
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