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The authors consider the Random Access CHannel (RACH) of a multi-beam satellite system with universal frequency reuse. They benefit from the spatial diversity and the strong directivity of multiple antennas at the satellite to resolve contentions and perform channel estimation. They propose two approaches to detect active Satellite Terminals (ST) and estimate the channel coefficients of some or all the colliding STs: Grid Reduction (GR) and Successive Channel Cancelation (SCC) algorithm. The performance of the proposed approaches is assessed by numerical results and compared with the conventional satellite RACH system.
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