URL：https://www.researchgate.net/publication/350601147/figure/fig1/AS:1009713755992064@1617745927637/The-constellation-diagram-of-the-superimposed-symbol-for-2-20.ppm
掲載元：https://www.researchgate.net/figure/The-constellation-diagram-of-the-superimposed-symbol-for-2-20_fig1_350601147
