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As in terrestrial reliable multicasting, feedback implosion is a major problem in satellite multicast. The feedback implosion occurs when a large number of receivers sends their feedback to the satellite. A poker-game-based feedback suppression (PFS) algorithm is proposed for scalable satellite reliable multicast protocols. An analytical model is provided for the feedback suppression performance of the PFS scheme. This model is validated by simulation results. Numerical examples show that feedback can be effectively suppressed by introducing the PFS algorithm.