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Two-way relaying is one of the major applications of broadband communicationsatellites, for which an efficient technique is Physical Layer Network Coding(PLNC). Earlier studies have considered satellites employing PLNC with onboardprocessing. This paper investigates the performance of PLNC overnon-regenerative satellites, as a majority of the operational and plannedsatellites have no onboard processing. Assuming that the channel magnitudes ofthe two users are equal, two operating conditions are considered withuncoded-QPSK relaying. In the first condition, both users are completelysynchronized in phase and transmit power, and in the second condition, phase isnot synchronized. The peak power constraint imposed by the satellite amplifieris considered and the error performance bounds are derived for both theconditions. The simulation results for end-to-end Bit Error Rate (BER) andthroughput are provided. These results shall enable communication systemdesigners to decide system parameters like power and linearity, and performtradeoff analysis between different relaying schemes.

Performance Analysis of Physical Layer Network Coding for Two-way Relaying over Non-regenerative Communication Satellites