Text this: Pilot design for BEM-Based channel estimation in doubly selective channel

            _____     _____     _____      _____  
    ___    |  ___||  / ____||  |  ___||   / ___// 
   /   ||  | ||__   / //---`'  | ||__     \___ \\ 
  | [] ||  | ||__   \ \\___    | ||__     /    // 
   \__ ||  |_____||  \_____||  |_____||  /____//  
    -|_||  `-----`    `----`   `-----`  `-----`   
     `-`