Joint user and transmit antenna selection for uplink multi-user MIMO systems

This paper investigates the joint user and transmit antenna selection for uplink multi-user MIMO systems. Our goal is to maximize the sum-rate capacity. The naive exhaustive search algorithm which can get the optimal sum rate performance is impractical in the large system. To tradeoff the complexity and performance, two suboptimal low-complexity joint user and transmit antenna selection algorithms (called CB-JUTAS and NB-JUTAS) are proposed. Numerical results show that the sum rate performance can be improved significantly by implementing joint user and transmit antenna selection. And the proposed CB-JUTAS may reach about 98% of the optimal sum rate performance with the complexity increasing linearly rather than exceptionally with the number of users and antennas. The NB-JUTAS with an extreme low-complexity has a reduced performance when SNR grows large, especially when the number of the transmit antennas increases.