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  ______     ___     __   _      ___       _____  
 /_   _//   / _ \\  | || | ||   / _ \\    / ___// 
   | ||    | / \ || | '--' ||  / //\ \\   \___ \\ 
  _| ||    | \_/ || | .--. || |  ___  ||  /    // 
 /__//      \___//  |_|| |_|| |_||  |_|| /____//  
 `--`       `---`   `-`  `-`  `-`   `-` `-----`

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Text this: Impact of channel knowledge on cognitive radio system capacity