Bit detection threshold in a TDMA burst communication system
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United States of America Patent
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Jun 27, 2006
Grant Date -
Jan 10, 2002
app pub date -
Jun 26, 2001
filing date -
Jul 10, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
A method is disclosed for optimally adjusting the received bit detection threshold in a digital communication system, such as a TDMA system that is characterized by very short duration burst transmissions. In one embodiment of the invention, a half-duplex radio modem is used for transmission and receipt of messages for airborne and ground-based Automatic Dependent Surveillance-Broadcast (ADS-B) service. A feedback path is provided for in the transmission/receiver unit to provide the transmission signal to the receiver path. A bit detection threshold adjustment circuit receives the transmission signal. The circuit digitizes the analog baseband signal, detects the positive and negative peak values and calculates a peak-to-peak deviation value to define the bit detection threshold value.
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