Massive MIMO with Multi-cell MMSE Processing: Exploiting All Pilots for Interference Suppression

摘要: In this paper, a new state-of-the-art multi-cell MMSE scheme is proposed for massive MIMO networks, which includes an uplink detector and downlink precoder. The main novelty that it exploits all available pilots interference suppression. Specifically, let $K$ $B$ denote the number of users per cell orthogonal pilot sequences in network, respectively, where $\beta = B/K$ reuse factor. Then our utilizes channel directions, can be estimated locally at each base station, to actively suppress both intra-cell inter-cell interference. particularly practical general, since power control payload, imperfect estimation arbitrary allocation are accounted for. Simulations show significant spectral efficiency (SE) gains obtained over single-cell ZF, large $\beta$ and/or $K$. Furthermore, large-scale approximations SINRs derived, asymptotically tight large-system limit. easy compute very accurate even small system dimensions. Using these SINR approximations, low-complexity algorithm also maximize sum SE.