The differentiation of uplink and downlink carriers are important in
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The uplink frequency is higher than that of the down because the transmit amplifier in the down link has a limited power supply power budget as it is on board of the satellite where the satellite is powered by photovoltaic generators.
In this way the path loss of the downlink will be smaller and the link needs smaller transmit power to achieve the required energy per bit to noise density ratio Eb/N0 for certain certain bit error rate.
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