Search Results for author: Zaichen Zhang

Found 11 papers, 0 papers with code

Large-Scale RIS Enabled Air-Ground Channels: Near-Field Modeling and Analysis

no code implementations19 Mar 2024 Hao Jiang, Wangqi Shi, Zaichen Zhang, Cunhua Pan, Qingqing Wu, Feng Shu, Ruiqi Liu, Jiangzhou Wang

Then, we develop a beam domain channel model based on the proposed sub-array partition framework for large-scale RIS-enabled UAV-to-vehicle communication systems, which can be used to efficiently capture the sparse features in RIS-enabled UAV-to-vehicle channels in both near-field and far-field ranges.

Dynamic Sub-array Based Modeling for Large-Scale RIS-assisted mmWave UAV Channels

no code implementations24 Jul 2023 Baiping Xiong, Zaichen Zhang, Jiangzhou Wang

Large-scale reconfigurable intelligent surface (RIS) can effectively enhance the performance of millimeter wave (mmWave) unmanned aerial vehicle (UAV) to ground communication link with obstructed line-of-sight (LoS) path by exploiting more reflecting units.

Channel Modeling for Heterogeneous Vehicular ISAC System with Shared Clusters

no code implementations16 Jul 2023 Baiping Xiong, Zaichen Zhang, Yingmeng Ge, Haibo Wang, Hao Jiang, Liang Wu, Ziyang Zhang

In this paper, we consider the channel modeling of a heterogeneous vehicular integrated sensing and communication (ISAC) system, where a dual-functional multi-antenna base station (BS) intends to communicate with a multi-antenna vehicular receiver (MR) and sense the surrounding environments simultaneously.

Two-Timescale Transmission Design for RIS-Aided Cell-Free Massive MIMO Systems

no code implementations16 Oct 2022 Jianxin Dai, Jin Ge, Kangda Zhi, Cunhua Pan, Zaichen Zhang, Jiangzhou Wang, Xiaohu You

Finally, the numerical results demonstrate the correctness of our derived expressions and the benefits of deploying large-size RISs into cell-free mMIMO systems.

Fast and Arbitrary Beam Pattern Design for RIS-Assisted Terahertz Wireless Communication

no code implementations6 May 2022 Jian Dang, Zaichen Zhang, Yewei Li, Liang Wu, Bingcheng Zhu, Lei Wang

Reconfigurable intelligent surface (RIS) can assist terahertz wireless communication to restore the fragile line-of-sight links and facilitate beam steering.

Performance Analysis of Hybrid RF-Reconfigurable Intelligent Surfaces Assisted FSO Communication

no code implementations21 Jan 2022 Haibo Wang, Zaichen Zhang, Bingcheng Zhu, Yidi Zhang

Optical reconfigurable intelligent surface (ORIS) is an emerging technology that can achieve reconfigurable optical propagation environments by precisely adjusting signal's reflection and shape through a large number of passive reflecting elements.

A Novel Two-stage Design Scheme of Equalizers for Uplink FBMC/OQAM-based Massive MIMO Systems

no code implementations4 Dec 2021 Yuhao Qi, Jian Dang, Zaichen Zhang, Liang Wu, Yongpeng Wu

However, existing works show that there remains residual interference after single-tap equalization even with infinite number of BS antennas, leading to a limitation of achievable signal-to-interference-plus-noise ratio (SINR) performance.

A Novel Method to Estimate the Coordinates of LEDs in Wireless Optical Positioning Systems

no code implementations9 Sep 2021 Kehan Zhang, Zaichen Zhang, Bingcheng Zhu

Traditional visible light positioning (VLP) systems estimate receivers' coordinates based on the known light-emitting diode (LED) coordinates.

Acquisition of Channel State Information for mmWave Massive MIMO: Traditional and Machine Learning-based Approaches

no code implementations16 Jun 2020 Chenhao Qi, Peihao Dong, Wenyan Ma, Hua Zhang, Zaichen Zhang, Geoffrey Ye Li

The accuracy of channel state information (CSI) acquisition directly affects the performance of millimeter wave (mmWave) communications.

BIG-bench Machine Learning

Data-Rate Driven Transmission Strategy for Deep Learning Based Communication Systems

no code implementations20 Dec 2018 Xiao Chen, Julian Cheng, Zaichen Zhang, Liang Wu, Jian Dang

The GDR scheme can achieve higher data rate than the conventional one-hot vector scheme with comparable BLER performance.

Information Theory Information Theory

Improving Massive MIMO Belief Propagation Detector with Deep Neural Network

no code implementations2 Apr 2018 Xiaosi Tan, Weihong Xu, Yair Be'ery, Zaichen Zhang, Xiaohu You, Chuan Zhang

Numerical results are presented to demonstrate the performance of the DNN detectors in comparison with various BP modifications.

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