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

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Text this: Effect of feedback delay on downlink amplify-and-forward relaying with beamforming