Text this: Global-max-volume algorithms for the user selection of the multiuser MIMO downlink systems with multiantenna users and block diagonalization

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