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MU-MIMO Communications with MIMO Radar: From Co-existence to Joint Transmission

Liu, F; Masouros, C; Li, A; Sun, H; Hanzo, L; (2018) MU-MIMO Communications with MIMO Radar: From Co-existence to Joint Transmission. IEEE Transactions on Wireless Communications , 14 (4) pp. 2755-2770. 10.1109/TWC.2018.2803045. Green open access

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Abstract

Beamforming techniques are proposed for a joint multi-input-multi-output (MIMO) radar-communication (Rad- Com) system, where a single device acts both as a radar and a communication base station (BS) by simultaneously communicating with downlink users and detecting radar targets. Two operational options are considered, where we first split the antennas into two groups, one for radar and the other for communication. Under this deployment, the radar signal is designed to fall into the null-space of the downlink channel. The communication beamformer is optimized such that the beampattern obtained matches the radar & #x2019;s beampattern while satisfying the communication performance requirements. To reduce the optimizations & #x2019; constraints, we consider a second operational option, where all the antennas transmit a joint waveform that is shared by both radar and communications. In this case, we formulate an appropriate probing beampattern, while guaranteeing the performance of the downlink communications. By incorporating the SINR constraints into objective functions as penalty terms, we further simplify the original beamforming designs to weighted optimizations, and solve them by efficient manifold algorithms. Numerical results show that the shared deployment outperforms the separated case significantly, and the proposed weighted optimizations achieve a similar performance to the original optimizations, despite their significantly lower computational complexity.

Type: Article
Title: MU-MIMO Communications with MIMO Radar: From Co-existence to Joint Transmission
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/TWC.2018.2803045
Publisher version: http://doi.org/10.1109/TWC.2018.2803045
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 3.0 License. For more information, see http://creativecommons.org/licenses/by/3.0/.
Keywords: Radar, Radar antennas, Optimization, Downlink, Interference, Array signal processing, MIMO communication, MU-MISO downlink, radar-communication coexistence, beampattern design, beamforming, Riemannian manifold
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1563386
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