Journal
IEEE TRANSACTIONS ON SIGNAL PROCESSING
Volume 70, Issue -, Pages 1749-1763Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TSP.2022.3157975
Keywords
Radar; Receivers; Radar detection; Wireless communication; Radar antennas; MIMO radar; Location awareness; MIMO radar; LOS; NLOS; bi; mono-static; target detection; reconfigurable intelligent surfaces
Categories
Funding
- Research Program Dipartimenti di Eccellenza 2018-2022 - Italian Ministry of Education, University and Research
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This study considers the problem of target detection in a RIS-aided MIMO radar. It proposes a general signal model and suitable optimization algorithms. The performance analysis shows the benefits of using RISs and emphasizes the importance of the RIS deployment location.
A reconfigurable intelligent surface (RIS) is a nearly-passive flat layer made of inexpensive elements that can add a tunable phase shift to the impinging electromagnetic wave and are controlled by a low-power electronic circuit. This paper considers the fundamental problem of target detection in a RIS-aided multiple-input multiple-output (MIMO) radar. At first, a general signal model is introduced, which includes the possibility of using up to two RISs (one close to the radar transmitter and one close to the radar receiver) and subsumes both a monostatic and a bistatic radar configuration with or without a line-of-sight view of the prospective target. Upon resorting to a generalized likelihood ratio test (GLRT), the design of the phase shifts introduced by the RIS elements is formulated as the maximization of the probability of detection in the location under inspection for a fixed probability of false alarm, and suitable optimization algorithms are proposed. The performance analysis shows the benefits granted by the presence of the RISs and shed light on the interplay among the key system parameters, such as the radar-RIS distance, the RIS size, and the location of the prospective target. A major finding is that the RISs should be better deployed in the near-field of the radar arrays at both the transmit and the receive side. The paper is concluded by discussing some open problems and foreseen applications.
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