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 tran-sponder 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).