Statistical QoS-Aware Precoding Design for Downlink Multiuser MIMO Systems with Per-Antenna Power Constraints

In this letter, effective capacity is adopted as the performance metric to design precoding matrix for downlink multi-user MIMO (MU-MIMO) systems under statistical QoS constraints and per-antenna power constraints. An equivalent problem is formulated by exploiting the weighted minimum mean-square error (WMMSE) framework. An iteration algorithm employing block coordinate descent (BCD) method is subsequently proposed to solve the equivalent problem. Numerical results reveal that under strict delay constraints, the proposed scheme has significant performance improvement compared to existing schemes.