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  _____      ___     ______      ___              
 / ____||   / _ \\  |      \\   / _ \\      ___   
/ //---`'  / //\ \\ |  --  //  | / \ ||    /   || 
\ \\___   |  ___  |||  --  \\  | \_/ ||   | [] || 
 \_____|| |_||  |_|||______//   \___//     \__ || 
  `----`  `-`   `-` `------`    `---`       -|_|| 
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發送短信 : Mã lưới cho kênh Fading Rayleigh