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             ___     _    _      ___     _    _   
  ____      / _ \\  | |  | ||   / _ \\  | || | || 
 |    \\   / //\ \\ | |/\| ||  / //\ \\ | || | || 
 | [] ||  |  ___  |||  /\  || |  ___  ||| \\_/ || 
 |  __//  |_||  |_|||_// \_|| |_||  |_|| \____//  
 |_|`-`   `-`   `-` `-`   `-` `-`   `-`   `---`   
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Text this: Effect of feedback delay on downlink amplify-and-forward relaying with beamforming