Protecting massive MIMO-radar coexistence: precoding design and power control

Mohamed Elfiatoure*, Mohammadali Mohammadi, Hien Quoc Ngo, Peter J. Smith, Michail Matthaiou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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This paper studies the coexistence between a downlink multiuser massive multi-input-multi-output (MIMO) communication system and MIMO radar. The performance of the massive MIMO system with maximum ratio (MR), zero-forcing (ZF), and protective ZF (PZF) precoding designs is characterized in terms of spectral efficiency (SE) and by taking the channel estimation errors and power control into account. The idea of PZF precoding relies on the projection of the information-bearing signal onto the null space of the radar channel to protect the radar against communication signals. We further derive closed-form expressions for the detection probability of the radar system for the considered precoding designs. By leveraging the closed-form expressions for the SE and detection probability, we formulate a power control problem at the radar and base station (BS) to maximize the detection probability while satisfying the per-user SE requirements. This optimization problem can be efficiently tackled via the bisection method by solving a linear feasibility problem. Our analysis and simulations show that the PZF design has the highest detection probability performance among all designs, with intermediate SE performance compared to the other two designs. Moreover, by optimally selecting the power control coefficients at the BS and radar, the detection probability improves significantly.

Original languageEnglish
Pages (from-to)276-293
Number of pages18
JournalIEEE Open Journal of the Communications Society
Publication statusPublished - 29 Dec 2023


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