Coherent detection without transmission preamble
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United States of America Patent
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Sep 29, 2009
Grant Date -
Apr 24, 2008
app pub date -
Oct 22, 2007
filing date -
Feb 28, 2000
priority date (Note) -
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Abstract
A receiving system allows for the coherent detection of a spread-spectrum transmission at any point in time during the transmission, thereby avoiding the need to identify the start of the transmission during the transmission-detection process. An input buffer captures the transmissions on a communication channel using a moving time-window. A detector processes a time-slice from the input buffer and identifies all of the simultaneously transmitting transmitters during that time-slice. As each transmitter is identified, the demodulator traces back-in-time to identify where the message can first be detected in the input buffer. The transmission includes suitable characteristics to facilitate detection and demodulation of the message content, but need not contain a preamble to allow the detection process.
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