he term dirty paper coding comes Max Costa[1] who imagined a paper which is partially covered with dirt that is indistinguishable ink. The theorem says that if the writer knows where the dirt is to start with, she can convey just as much information

MU-MIMO is widely considered a key technology for system capacity improvement in modern wireless networks. In contrast to SU-MIMO, where the spatial multiplexing gain is confined to a single user, MU-MIMO allows multiple users to be co-sche