Linear transceiver and receiver design methods for multiuser MIMO channels

Multiuser multiple-input multiple-output (MU-MIMO) systems has attracted considerable interests due to the promising potentials. In this paper, we are trying to make some connections between linear transmitter/beamforming and receiver design in MU-MIMO systems with code-division multiple-access (CDMA) signature and receiver design methods. Some methods discussed previously in optimization of CDMA signatures and receivers may be applied to the multiuser MIMO systems, to design the linear beamforming and receiving vectors. With a general multiuser MIMO system model, we present three different design methods based on three different criteria: (i) Minimizing the effective TSC among all users; (ii) Minimizing the total mean square error (MSE); (iii) Maximizing the sum capacity of the system. We derive in details the design methods under those different design criteria. Simulation results show that different methods demonstrate differently under those criteria.