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 / ____|| | || | ||  \ \\/ //   / _ \\  | \  / || 
/ //---`' | || | ||   \   //   / //\ \\ |  \/  || 
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 \_____||  \____//   /_//\_\\ |_||  |_|||_|\/|_|| 
  `----`    `---`    `-`  --` `-`   `-` `-`  `-`

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發送短信 : Blind channel estimation for OFDM systems via a general non-redundant precoding