Resonant Beam Multitarget DOA Estimation

Y. Jay Guo

doi:10.1109/JIOT.2026.3664085

Resonant Beam Multitarget DOA Estimation

2026-02-12

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DOI：10.1109/JIOT.2026.3664085

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With the increasing demand for Internet of Things (IoT) applications, especially for location-based services, how to locate passive mobile targets (MTs) with minimal beam adjustment has become a challenge. Resonant beam systems (RBSs) are considered promising IoT technologies with advantages such as beam self-alignment and energy concentration. However, resonant systems are difficult to apply to multiuser scenarios due to co-frequency interference. To establish a resonant system for multitarget localization, this article designs an innovative resonant system architecture based on frequency-division multiple access (FDMA), which enables a base station (BS) to establish connections with multiple MTs with different carriers and establishes a multichannel cyclic model through a retrodirective array (RDA) to achieve one-to-many electromagnetic wave propagation and MTs direction-of-arrival (DOA) estimation through echo signals. Simulation results show that the proposed system supports resonant establishment between the BS and multiple MTs. This helps the BS to maintain high DOA estimation accuracy when faced with multiple passive MTs, ensuring that the DOA error is less than 1° within a range of 5 m and 50° field of view, and the accuracy is higher than that of active beamforming localization systems (BFLSs) under the same conditions.

Keywords:

Beam self-alignment

direction of arrival (DOA)

multiple-input multiple-output (MIMO)

passive localization

resonant beam system (RBS)

space array signal processing

Resonant Beam Multitarget DOA Estimation

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