Adaptive transmit power control can be used to improve the spectrum efficiency of fixed links
by limiting the transmit power to that required to maintain a constant bit error rate (BER)
regardless of the propagation conditions. This results in a reduced transmit power being used
during clear sky conditions, meaning that the interference resulting from the ATPC link is
correspondingly lower. This improves the frequency reuse factor associated with a given band
and geographic area, providing a spectrum efficiency gain.
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