中继节点的选择是协作通信中的重要问题。
Relay selection is a crucial challenge in cooperative communication.
这样，卫星在SBS2的覆盖区域内选择中继节点。
In this case, satellite selects a relay node in the coverage region of SBS2.
因此，对信源和中继节点之间的功率优化分配有着极其重要的现实意义。
Therefore, there is great practical significance on optimal power allocation between source and relay nodes.
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