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   _____     ___      _____     ______    ______  
  / ___//   / _ \\   /  ___||  /_   _//  /_____// 
  \___ \\  / //\ \\ | // __     -| ||-   `____ `  
  /    // |  ___  ||| \\_\ ||   _| ||_   /___//   
 /____//  |_||  |_|| \____//   /_____//  `__ `    
`-----`   `-`   `-`   `---`    `-----`   /_//     
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Text this: Resource allocation in multiuser OFDM based cognitive radio systems