Co-Designing Statistical MIMO Radar and In-band Full-Duplex Multi-User MIMO Communications

Abstract

We present a spectral co-design of a statistical multipleinput-multiple-output (MIMO) radar and an in-band full-duplex (IBFD) multi-user MIMO (MU-MIMO) communications system both of which concurrently operate within the same frequency band. Prior works on MIMO-radar-MIMO-communications (MRMC) problem either focus on colocated MIMO radars and half-duplex/single-user MIMO communications, seek coexistence solutions, do not jointly design waveforms and receiver processing or omit practical system constraints. Here, we jointly design statistical MIMO radar waveform, uplink (UL)/downlink (DL) precoders, and receive filters. To this end, we employ a novel performance measure, namely compounded-and-weighted sum mutual information (CWSM), that is subjected to multiple practical constraints of UL/DL transmit power, UL/DL quality of service, and peak-to-average-powerratio. We solve the resulting non-convex problem by incorporating block coordinate descent (BCD) and alternating projection (AP) methods in a single algorithmic framework called BCD-AP MRMC. We achieve this by exploiting the relationship between mutual information and weighted minimum mean-squared-error (WMMSE), which allows use of the Lagrange dual problem in finding closed-form solutions for precoders and radar waveform. Numerical experiments show that our proposed WMMSE-based method quickly achieves monotonic convergence, improves target detection by 6-13% compared to conventional radar coding, and provides 8.3-30% higher rate in IBFD MU-MIMO system than other precoding strategies.

Resource Allocation in Heterogeneously-Distributed Joint Radar-Communications Under Asynchronous Bayesian Tracking Framework

“…The distributed radar proposed in [20] exploits a communications waveform but operates in passive (receive-only) mode. The co-design framework in [21] develops new waveforms and precoders for a distributed but identical units of radar and communications. The displaced sensor imaging in [22] considers identical units of radar sensors on the same vehicular platform that coordinate timing via communications protocols.…”

Resource Allocation in Heterogeneously-Distributed Joint Radar-Communications under Asynchronous Bayesian Tracking Framework

“…The distributed radar proposed in [17] exploits a communications waveform but operates in passive (receive-only) mode. The co-design framework in [18] develops new waveforms and precoders for a distributed but identical units of radar and communications. The displaced sensor imaging in [19] considers identical units of radar sensors on the same vehicular platform that coordinate timing via communications protocols.…”

Terahertz-Band Joint Ultra-Massive MIMO Radar-Communications: Model-Based and Model-Free Hybrid Beamforming

“…With this recent rise of both radar and communications applications at THz, it has been suggested [27] to integrate radar sensing and communications functionalities in future wireless THz systems to facilitate spectrum sharing, enhance pencil beamforming, save hardware cost, and improve resource usage. This follows recent efforts in realizing such joint radarcommunications (JRC) architectures at mmWave [2], including for ultrashort ranges [28], joint MIMO-radar-MIMOcommunications [29], and distributed MIMO JRC [30]. In this paper, we focus on a UM-MIMO structure for JRC at THz band.…”