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Precoder Design for Joint In-Band Full-Duplex MIMO Communications and Widely-Distributed MIMO Radar

We present a precoder design algorithm for an in-band full-duplex (IBFD) multi-user multiple-input-multiple-output (MU-MIMO) communications system concurrently operating within the same frequency band with a widely-distributed MIMO radar (WDMR). Prior works on joint radar communications (JRC) problems primarily focus on colocated MIMO radars and half-duplex/single-user MIMO communications. We maximize the weighted sum rate (WSR) of the joint radar-communications system subjected to UL/DL power budgets and quality of service. We solve the WSR maximization problem as a weighted minimum mean-squared-error (WMMSE) minimization problem by exploiting the relationship between achievable rate and MSE. A block coordinate descent (BCD) algorithm is resorted to finding the precoders for all UEs sequentially. Our numerical experiments demonstrate that the proposed precoder design scheme outperforms conventional precoding strategies in the presence of a WDMR.