MIMO designs for mmWave wireless LAN systems

In this paper, we explore unique aspects of MIMO designs for mmWave wireless LAN systems, focusing on SU-MIMO feasibility at 60 GHz and implications on the MAC protocol design. We study the spectral efficiency gains achievable by using and MIMO with dual polarization in an indoor environment. We show that beyond 2 streams, MIMO gains (for SU-case) are rather limited and that fine beamforming with narrow beams is important for MIMO capacity gains. In this paper, we also provide efficient association and beamforming techniques for SU/MU-MIMO, enabling greater number of STAs to associate and refine beams in a given amount of time compared to the IEEE 802.11ad protocol.