19 citations · 27 across the 31 of their papers we have counts for
34 papers
Exploiting Mutual Coupling Structure for Channel Estimation of Active RIS-Assisted Links
Simon Tarboush, Pinjun Zheng, Hadi Sarieddeen +2
Accurate channel modeling and estimation of active reconfigurable intelligent surface (RIS)-assisted links with densely integrated elements are essential to fully unleashing this t…
Fast Tri-Hybrid Beamforming via Deep Unfolding
Pinjun Zheng, Md. Jahangir Hossain, Anas Chaaban
Tri-hybrid multiple-input multiple-output architectures have recently emerged as a promising enabler for next-generation wireless systems, as they potentially provide enhanced desi…
Quantization-Aware EE Optimization and SE-EE Tradeoff for MiLAC-Aided MU-MISO Beamforming
Yuchen Zhang, Pinjun Zheng, Tareq Y. Al-Naffouri
In large antenna arrays, hardware power consumption becomes a dominant design constraint, making energy efficiency (EE) a first-class objective alongside spectral efficiency (SE).…
Millimeter-Wave RIS: Hardware Design and System-Level Considerations
Ruiqi Wang, Pinjun Zheng, Yiming Yang +6
Reconfigurable intelligent surfaces have emerged as a promising hardware platform for shaping wireless propagation environments at millimeter-wave (mm-Wave) frequencies and beyond.…
Integrated Positioning and Communication for Cooperative Multi-LEO Uplink Communications: A Dual-Timescale Kalman Filter-Aided Approach
Ali Hanif, Yuchen Zhang, Pinjun Zheng +1
Low Earth orbit (LEO) satellites are a crucial component of the future non-terrestrial networks (NTN) due to lower latency, robust signal strengths, shorter revisit times, and dens…
Orbital Errors in LEO Satellite Positioning: Modeling, Analysis, and Bayesian Calibration
Jie Ma, Pinjun Zheng, Xing Liu +3
Low-Earth orbit (LEO) satellites offer a promising alternative to global navigation satellite systems for precise positioning. However, their relatively low altitudes make them mor…
Model-Free Channel Estimation for Massive MIMO: A Channel Charting-Inspired Approach
Pinjun Zheng, Md. Jahangir Hossain, Anas Chaaban
Channel estimation is fundamental to wireless communications, yet it becomes increasingly challenging in massive multiple-input multiple-output (MIMO) systems where base stations e…
Reconfigurable Antennas for Next-Generation Wireless Communications: Technologies, Prototypes, Architectures, and Signal Processing
Pinjun Zheng, Ruiqi Wang, Yuchen Zhang +4
The transition to sixth-generation (6G) networks calls for wireless transceivers with enhanced adaptability and efficiency. Reconfigurable antennas (RAs) have emerged as a promisin…
Tri-Hybrid Multi-User Precoding Based on Electromagnetically Reconfigurable Antennas
Pinjun Zheng, Yuchen Zhang, Tareq Y. Al-Naffouri +2
The tri-hybrid precoding architecture based on electromagnetically reconfigurable antennas (ERAs) is a promising solution for overcoming key limitations in multiple-input multiple-…
Design and Channel Modeling of Electromagnetically Reconfigurable Antennas
Ruiqi Wang, Pinjun Zheng, Tareq Y. Al-Naffouri +1
In this work, a novel design of electromagnetically reconfigurable antennas (ERAs) based on a fluid antenna system (FAS) is proposed, and the corresponding wireless channel model i…
Tri-Hybrid Multi-User Precoding Using Pattern-Reconfigurable Antennas: Fundamental Models and Practical Algorithms
Pinjun Zheng, Yuchen Zhang, Tareq Y. Al-Naffouri +2
The integration of pattern-reconfigurable antennas into hybrid multiple-input multiple-output (MIMO) architectures presents a promising path toward high-efficiency and low-cost tra…
Enhanced Beampattern Synthesis Using Electromagnetically Reconfigurable Antennas
Pinjun Zheng, Md. Jahangir Hossain, Anas Chaaban
Beampattern synthesis seeks to optimize array weights to shape radiation patterns, playing a critical role in various wireless applications. In addition to theoretical advancements…
Joint Bistatic Positioning and Monostatic Sensing: Optimized Beamforming and Performance Tradeoff
Yuchen Zhang, Hui Chen, Pinjun Zheng +4
We investigate joint bistatic positioning (BP) and monostatic sensing (MS) within a multi-input multi-output orthogonal frequency-division system. Based on the derived Cramér-Rao B…
Optimized Beamforming for Joint Bistatic Positioning and Monostatic Sensing
Yuchen Zhang, Hui Chen, Pinjun Zheng +3
We investigate the performance tradeoff between \textit{bistatic positioning (BP)} and \textit{monostatic sensing (MS)} in a multi-input multi-output orthogonal frequency division…
Privacy Preservation in MIMO-OFDM Localization Systems: A Beamforming Approach
Yuchen Zhang, Hui Chen, Musa Furkan Keskin +4
We investigate an uplink MIMO-OFDM localization scenario where a legitimate base station (BS) aims to localize a user equipment (UE) using pilot signals transmitted by the UE, whil…
Electromagnetically Reconfigurable Fluid Antenna System for Wireless Communications: Design, Modeling, Algorithm, Fabrication, and Experiment
Ruiqi Wang, Pinjun Zheng, Vijith Varma Kotte +5
This paper presents the concept, design, channel modeling, beamforming algorithm development, prototype fabrication, and experimental measurement of an electromagnetically reconfig…
Positioning-Aided Channel Estimation for Multi-LEO Satellite Cooperative Beamforming
Yuchen Zhang, Pinjun Zheng, Jie Ma +2
We investigate a multi-low Earth orbit (LEO) satellite system that simultaneously provides positioning and communication services to terrestrial user terminals. To address the chal…
Integrated 6G TN and NTN Localization: Challenges, Opportunities, and Advancements
Sharief Saleh, Pinjun Zheng, Xing Liu +8
The rapid evolution of cellular networks has introduced groundbreaking technologies, including large and distributed antenna arrays and reconfigurable intelligent surfaces in terre…
6G RIS-aided Single-LEO Localization with Slow and Fast Doppler Effects
Sharief Saleh, Musa Furkan Keskin, Basuki Priyanto +5
6G networks aim to enable applications like autonomous driving by providing complementary localization services through key technologies such as non-terrestrial networks (NTNs) wit…
Mutual Coupling-Aware Channel Estimation and Beamforming for RIS-Assisted Communications
Pinjun Zheng, Simon Tarboush, Hadi Sarieddeen +1
This work studies the problems of channel estimation and beamforming for active reconfigurable intelligent surface (RIS)-assisted multiple-input multiple-output (MIMO) communicatio…
Calibration in RIS-aided Integrated Sensing, Localization and Communication Systems
Reza Ghazalian, Pinjun Zheng, Hui Chen +6
Reconfigurable intelligent surfaces (RISs) are key enablers for integrated sensing and communication (ISAC) systems in the 6G communication era. With the capability of dynamically…
A Statistical Evaluation of Coherence Time for Non-Terrestrial Communications
Pinjun Zheng, Anas Chaaban, Md. Jahangir Hossain +1
Non-terrestrial networks (NTNs) present significant challenges for reliable communication due to the dynamic nature of their channels. Studying channel coherence time is crucial, s…
LEO- and RIS-Empowered User Tracking: A Riemannian Manifold Approach
Pinjun Zheng, Xing Liu, Tareq Y. Al-Naffouri
Low Earth orbit (LEO) satellites and reconfigurable intelligent surfaces (RISs) have recently drawn significant attention as two transformative technologies, and the synergy betwee…
ELAA Near-Field Localization and Sensing with Partial Blockage Detection
Hui Chen, Pinjun Zheng, Yu Ge +4
High-frequency communication systems bring extremely large aperture arrays (ELAA) and large bandwidths, integrating localization and (bi-static) sensing functions without extra inf…