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  ______    _____     _  __   _    _             
 /_   _//  |  ___||  | |/ // | || | ||     ___   
   | ||    | ||__    | ' //  | || | ||    /   || 
  _| ||    | ||__    | . \\  | \\_/ ||   | [] || 
 /__//     |_____||  |_|\_\\  \____//     \__ || 
 `--`      `-----`   `-` --`   `---`       -|_|| 
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Text this: Frequency offset tracking for OFDM systems via scattered pilots and virtual carriers