Table 1 Example of PC mapping using the Gray code for $\left(\genfrac{}{}{0ex}{}{{\mathit{M}}_{\mathit{c}}}{{\mathit{M}}_{\mathit{p}}}\right)\mathbf{=}\left(\genfrac{}{}{0ex}{}{\mathbf{8}}{\mathbf{2}}\right)$

Message data

${\mathcal{B}}_{\mathit{i}}$

Frequencies

${\mathbf{\text{x}}}_{{\mathcal{B}}_{\mathit{i}}}\mathbf{=}{\mathbf{[}{\mathit{x}}_{\mathit{i}\mathbf{,}\mathbf{1}}{\mathit{x}}_{\mathit{i}\mathbf{,}\mathbf{2}}\mathbf{\dots }{\mathit{x}}_{\mathit{i}\mathbf{,}\mathbf{8}}\mathbf{]}}^{\mathit{T}}$