Table 1 Relative coding gains of SM using 4-QAM compared to SIMO using $\stackrel{\mathbf{~}}{\mathit{M}}$ -QAM

N _r

${\mathit{N}}_{\mathit{t}}^{\mathbf{\left(}\mathit{\xi }\mathbf{\right)}}\mathbf{=}{\mathbf{2}}^{\mathbf{1}}$

${\mathit{N}}_{\mathit{t}}^{\mathbf{\left(}\mathit{\xi }\mathbf{\right)}}\mathbf{=}{\mathbf{2}}^{\mathbf{2}}$

${\mathit{N}}_{\mathit{t}}^{\mathbf{\left(}\mathit{\xi }\mathbf{\right)}}\mathbf{=}{\mathbf{2}}^{\mathbf{3}}$

${\mathit{N}}_{\mathit{t}}^{\mathbf{\left(}\mathit{\xi }\mathbf{\right)}}\mathbf{=}{\mathbf{2}}^{\mathbf{4}}$

${\mathit{N}}_{\mathit{t}}^{\mathbf{\left(}\mathit{\xi }\mathbf{\right)}}\mathbf{=}{\mathbf{2}}^{\mathbf{5}}$

${\mathit{N}}_{\mathit{t}}^{\mathbf{\left(}\mathit{\xi }\mathbf{\right)}}\mathbf{=}{\mathbf{2}}^{\mathbf{6}}$