Power allocation for shared and frequency hopped transponder

This paper presents an approach to allocate power for multiple hopping signals, received from multiple uplink antennas for a shared power transponder. First, the end-to-end carrier-to-noise density ratio (CNRo) for a signal that hops within the transponder bandwidth is derived. This expression includes power-sharing factor, noise power robbing effects due to transponder noise, and intermodulation (IM) products. Next, the signal power allocation is determined to support the users´ requested data rates. Finally, the transponder gain is determined so that its traveling wave tube amplifier (TWTA) can operate at the desired nominal operating point (NOP).