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Let $\mathcal{Q}_{b}$ be the variable-length quantizer in our previous work. Then, for ${\pmb h}$ and the selected rate $R_s$, we can find an appropriate beamforming vector such that $\left|{\pmb h}^{+}{\pmb w}\right|^2 \geq R_s$, and the average feedback rate is finite.   The left remaining  problem is to design the codebook $\mathcal{C}_R$. $\mathcal{C}_b$. The average achieved rate of the MISO network is   \begin{align}  \end{align}  \section{Power Allocation for Non-Orthogonal Multiple-Access (NOMA) Systems with Limited Feedback}