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The remaining problem is to design the codebook $\mathcal{C}_b$. The average achieved rate of the MISO network is   \begin{align}  \sum_{i=0}^{2^{B_1}-2}\text{Prob}\left\{R_i < \left|\left|\pmb h\right|\right|^2 \leq R_{i+1}\right\}R_i  \end{align}