Performance Evaluation of MU-MIMO Transmissions with Joint Interference Constraint in HetNet

In this paper, we investigate the per-tier outage probability of multiuser multiple-input multiple-output (MU-MIMO) transmissions in heterogeneous networks (HetNets) with joint interference constraint. tier cellular cell, user equipment (UE) is required to report measured channel information and base station (BS) adopts ZF-based precoding MU-MIMO transmission achieve diversity gain. With constraint cross-tier unpredicted inter-beam interference, derive closed-form expression downlink transmissions. Considering capacity nodes ad hoc networks, a max-SINR scheduler codebook-based are employed. The selects best receiving for each beam predefined codebook according signal plus noise ratio (SINR), transmitting node performs data using orthogonal beams. presence inter-node obtain when or uplink occur cell. Additionally, case that should satisfy quality service (QoS) requirement, restricted area cell which not greater than threshold explored. Numerical results show unpredictable degrades slightly. increases threshold.