Research

RIS-Aided Localization and Sensing

Reconfigurable intelligent surfaces (RISs) constitute a promising emerging technology for extending coverage and dynamically programming signal propagation with almost zero-energy consumption. This technology can support or even enable wireless communications, as well as localization and sensing tasks in various scenarios. The research works on this topic include:

RIS-enabled sidelink positioning (localize all the UEs without BSs involved) [J10]: single sidelink with multiple RISs [J17], single RIS with cooperative UEs [*J19]
RIS calibration: joint RIS calibration and UE localization using passive RIS [C14], [J14], or HRIS [J12]
RIS Localization: multi-static sensing of a RIS target [C15]
RIS-aided monostatic sensing: sensing and object detection with double bounce multipath [C16], access-point-free SLAM [J11]

MmWave/Terahertz Signal Localization

MmWave and Terahertz signals are the main enablers in the fifth/sixth generation (5G/6G) communication systems. Benefiting from the large bandwidth and array size, improved radio localization performance can assist in communication and location-based services. The research works on this topic include:

THz band localization tutorial [J6] with new signal features [J5]
Localization under model mismatch: hardware impairment [C6], [J15], near-field [C12], [J16], geometry mismatch [C17]
Localization and sensing under mobility [C11], [C13]
Evaluation of experimental data from a 5G base station [C8], [*J18]
Coverage analysis [C10], [J13]
Requirements [C7] and visions for positioning and sensing in 6G [J10]

Target Positioning and Location‑based Applications

DOA estimation algorithms [C2], [C4], [C5], [J4]
Ultrasound-based gesture recognition/air-writing system [C1], [C3], [J2]
Joint time-/phase-difference-of-arrival localization [J1]
Maximum-likelihood TDOA localization using difference-of-convex programming [J3]
Constrained wrapped least squares for GNSS [J7]
Antenna selection via DOA threshold region approximation [J8]