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\item The receiver obtains the channel vector ${\pmb h}$, picks the appropriate rate and transmit beamforming vector from $\mathcal{C}_R$ and $\mathcal{C}_b$ and sends their indices to the transmitter.  \end{enumerate}  Let $\mathcal{C}_{R} = \left\{0, \left\{R_0 = 0,  R_1, R_2, \ldots, R_{2^{B_1}}\right\}$ R_{2^{B_1}}\right\}$. The selected rate for the transmitter will be $R_{\star}$ such that $R_{\star} \leq \left|\left|\pmb h\right|\right|^2 \leq R_{\star}$  \section{Power Allocation for Non-Orthogonal Multiple-Access (NOMA) Systems with Limited Feedback}