Transmit Design for Joint MIMO Radar and Multiuser Communications With Transmit Covariance Constraint

In this paper, we consider the waveform design of a multiple-input multiple-output (MIMO) transmitter which simultaneously functions as MIMO radar and base station for downlink multiuser communications. addition to power constraint, require covariance transmit be equal given optimal radar, guarantee performance. With formulate solve signal-to-interference-plus-noise ratio (SINR) balancing problem beamforming via convex optimization. Considering that interference cannot completely eliminated with introduce dirty paper coding (DPC) further cancel interference, SINR sum rate maximization in DPC regime. Although both two problems are non-convex, show they can reformulated optimizations Lagrange downlink-uplink duality. addition, propose gradient projection based algorithms equivalent dual balancing, regimes. The simulation results demonstrate significant performance improvement over beamforming, also indicate degrees freedom communication is restricted by rank covariance.