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MIMO Radar and Cellular Coexistence: A Power-Efficient Approach Enabled by Interference Exploitation

Liu, F; Masouros, C; Li, A; Ratnarajah, T; Zhou, J; (2018) MIMO Radar and Cellular Coexistence: A Power-Efficient Approach Enabled by Interference Exploitation. IEEE Transactions on Signal Processing , 66 (14) pp. 3681-3695. 10.1109/TSP.2018.2833813. Green open access

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Abstract

We propose a novel approach to enable the coexistence between Multi-Input-Multi-Output (MIMO) radar and downlink multiuser multi-input single-output communication system. By exploiting the constructive multiuser interference (MUI), the proposed approach tradeoff useful MUI power for reducing the transmit power, to obtain a power efficient transmission. This paper focuses on two optimization problems: a) Transmit power minimization at the base station (BS), while guaranteeing the receive signal-to-interference-plus-noise ratio (SINR) level of downlink users and the interference-to-noise ratio level to radar; b) Minimization of the interference from BS to radar for a given requirement of downlink SINR and transmit power budget. To reduce the computational overhead of the proposed scheme in practice, an algorithm based on gradient projection is designed to solve the power minimization problem. In addition, we investigate the tradeoff between the performance of radar and communication, and analytically derive the key metrics for MIMO radar in the presence of the interference from the BS. Finally, a robust power minimization problem is formulated to ensure the effectiveness of the proposed method in the case of imperfect channel state information. Numerical results show that the proposed method achieves a significant power saving compared to conventional approaches, while obtaining a favorable performance-complexity tradeoff.

Type: Article
Title: MIMO Radar and Cellular Coexistence: A Power-Efficient Approach Enabled by Interference Exploitation
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/TSP.2018.2833813
Publisher version: http://doi.org/10.1109/TSP.2018.2833813
Language: English
Additional information: Copyright: This work is licensed under a Creative Commons Attribution 3.0 License. For more information, see http://creativecommons.org/licenses/by/3.0/
Keywords: MU-MISO downlink, radar-communication coexistence, spectrum sharing, constructive interference.
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/10057377
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