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  _  _      ___     _    _    _    _    __   __  
 | \| ||   / _ \\  | |  | || | || | ||  \ \\/ // 
 |  ' ||  / //\ \\ | |/\| || | || | ||   \   //  
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 |_|\_|| |_||  |_|||_// \_||  \____//   /_//\_\\ 
 `-` -`  `-`   `-` `-`   `-`   `---`    `-`  --`

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發送短信 : Symbol-error performance and bit-error performance of QAM signalling