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

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發送短信 : Frequency offset tracking for OFDM systems via scattered pilots and virtual carriers