Automatic transmit power level control in radio links
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United States of America Patent
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-
Feb 12, 1991
Grant Date -
N/A
app pub date -
Mar 23, 1989
filing date -
Mar 23, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The automatic transmit power level control in multiline radio links using a multilevel QAM modulation is basically comprised of: means to derive a threshold signal for each RF channel in each receiver, means to multiplex all threshold signals from the individual receivers, means to insert an appropriate signal in the said multiplexer as necessary to identify the station which it comes from, means to further multiplex the said multiplexed signal with other service signals, means to insert this dual-multiplexed signal in the frame of the main information signal sent to the other direction of transmission, means to receive and demultiplex the received signal two times, means to process the said demultiplexed signal so as to derive, on one hand, a transmit power level control signal, protected from possible faults or malfunctions of the main transmit digital channel and, on the other hand, the station identification signal, means to apply the said control signal to the pre-distortion circuit in the transmit power amplifier.
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