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y_n = h_n \sqrt{P}\sum_{m = 1}^N \sqrt{\alpha_m} x_m + v_n.  \nonumber  \end{align}  When the channels are ordered as $\left|h_1\right|^2 \leq \left|h_2\right|^2 \leq \cdots \left|h_N\right|^2$ \left|h_N\right|^2$, SIC will be performed at the users. Therefore, ${\sf U}_n$ will detect ${\sf U}_i$'s message when $i < n$, and then remove the detected message from its received signal $y_n$, in a successive way. The messages for $i > n$ are treated as noises. As a result,