4 papers
Freeform super-oscillatory optics for CMOS-integrated THz super-resolution imaging
Jin Chen, Liang Gao, Hao Guo +5
The diffraction limit fundamentally constrains the spatial resolution of far-field imaging systems. While near-field techniques can circumvent this limit, their inherently short wo…
An integrated super resolution THz 3D imaging system based on a linear nonlocal achromatic freeform Bessel beam lens and high power oscillator radiator array
Jin Chen, Liang Gao, Hao Guo +5
High performance terahertz (THz) 3D imaging is critical for non-destructive evaluation. However, conventional architectures are fundamentally limited by severe chromatic aberration…
Near-Field Wideband Channel Estimation for Extremely Large-Scale RIS-Aided Communication Systems
Lanqing Zhi, Hongwei Wang, Lingxiang Li +1
This paper studies wideband channel estimation for OFDM systems assisted by extremely large RIS (XL-RIS). Due to the large aperture of XL-RISs, the user equipment may operate in th…
Near-Field Channel Estimation for mmWave/THz Communications with Extremely Large-Scale UPAs
Yiming Chen, Hongwei Wang, Lingxiang Li +1
Extremely large antenna arrays (ELAAs) are widely adopted in mmWave/THz communications to compensate for the severe path loss, wherein the channel estimation remains a significant…