Point-to-multipoint burst modem automatic gain control
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United States of America Patent
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N/A
Issued Date -
Mar 18, 2004
app pub date -
Feb 20, 2002
filing date -
Feb 20, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The methods and apparatuses described herein allow very rapid AGC lock onto a burst radio frequency transmission. The advantage of these methods and apparatuses is that they allow rapid acquisition of packets, i.e. there is no multi-packet AGC training time before the packet data can be demodulated. The methods and apparatuses also allow the portion of the packet allocated to AGC acquisition time to be shortened, increasing system efficiency as a higher percentage of time is available for user data. The AGC techniques described herein use a novel method to acquire lock rapidly. If the signal is observed to be hardlimiting the A/D output the gain is reduced substantially. If the signal is observed to be in the linear operating portion of the A/D outputs operating range a single measurement is made to pull the AGC loop into its desired operating point.
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