ABSTRACT
There are different channel access methods for shared medium networks. Different network users might be separated in the time domain (time division duplex [TDD]), in the frequency domain (frequency division duplex [FDD]) or in the code domain (code division multiple access [CDMA]). However, if the transmitters and receivers have multiple transmit and receive ports (multiple-input multiple-output [MIMO]), different users might also be separated by the spatial dimension. Using MIMO in the multi-user (MU) context is called MU-MIMO. MU-MIMO has already proven to be a successful way of enhancing the MIMO performance of wireless transmissions [1–4]. The use of MIMO algorithms allows the transmission of several simultaneous spatial streams to different users on the same frequency band and time slot. Potentially, the total throughput is increased.
