Search Results for author: Kai-Kit Wong

Found 25 papers, 0 papers with code

Massive Wireless Energy Transfer without Channel State Information via Imperfect Intelligent Reflecting Surfaces

no code implementations15 Nov 2023 Cheng Luo, Jie Hu, Luping Xiang, Kun Yang, Kai-Kit Wong

Intelligent Reflecting Surface (IRS) utilizes low-cost, passive reflecting elements to enhance the passive beam gain, improve Wireless Energy Transfer (WET) efficiency, and enable its deployment for numerous Internet of Things (IoT) devices.

Proactive Monitoring via Jamming in Fluid Antenna Systems

no code implementations11 Oct 2023 Junteng Yao, Tuo Wu, Xiazhi Lai, Ming Jin, Cunhua Pan, Maged Elkashlan, Kai-Kit Wong

Our objective is to maximize the average monitoring rate, whose expression involves the integral of the first-order Marcum $Q$ function.

Pointing-and-Acquisition for Optical Wireless in 6G: From Algorithms to Performance Evaluation

no code implementations20 Sep 2023 Hyung-Joo Moon, Chan-Byoung Chae, Kai-Kit Wong, Mohamed-Slim Alouini

The increasing demand for wireless communication services has led to the development of non-terrestrial networks, which enables various air and space applications.

On Performance of Fluid Antenna System using Maximum Ratio Combining

no code implementations14 Sep 2023 Xiazhi Lai, Tuo Wu, Junteng Yao, Cunhua Pan, Maged Elkashlan, Kai-Kit Wong

This letter investigates a fluid antenna system (FAS) where multiple ports can be activated for signal combining for enhanced receiver performance.

A Partially Observable Deep Multi-Agent Active Inference Framework for Resource Allocation in 6G and Beyond Wireless Communications Networks

no code implementations22 Aug 2023 Fuhui Zhou, Rui Ding, Qihui Wu, Derrick Wing Kwan Ng, Kai-Kit Wong, Naofal Al-Dhahir

Simulation results demonstrate that our proposed framework can significantly improve the sum transmission rate of the secondary network compared to various benchmark schemes.

On the Generalization and Advancement of Half-Sine-Based Pulse Shaping Filters for Constant Envelope OQPSK Modulation

no code implementations14 Jun 2023 Pengcheng Mu, Yan Liu, Zihao Guo, Xiaoyan Hu, Kai-Kit Wong

The offset quadrature phase-shift keying (OQPSK) modulation is a key factor for the technique of ZigBee, which has been adopted in IEEE 802. 15. 4 for wireless communications of Internet of Things (IoT) and Internet of Vehicles (IoV), etc.

Resource Allocation for Cell-Free Massive MIMO-aided URLLC Systems Relying on Pilot Sharing

no code implementations21 Mar 2023 Qihao Peng, Hong Ren, Mianxiong Dong, Maged Elkashlan, Kai-Kit Wong, Lajos Hanzo

Specifically, to support multiple devices with limited pilot overhead, pilot reuse among the users is considered, where we formulate a joint pilot length and pilot allocation strategy for maximizing the number of devices admitted.

Pricing for Reconfigurable Intelligent Surface Aided Wireless Networks: Models and Principles

no code implementations1 Nov 2022 Yulan Gao, Yue Xiao, Xianfu Lei, Qiaonan Zhu, Dusit Niyato, Kai-Kit Wong, Pingzhi Fan, Rose Qingyang Hu

Specifically, we commence with a comprehensive introduction of RIS pricing with its potential applications in RIS networks, meanwhile the fundamentals of pricing models are summarized in order to benefit both RIS holders and WSPs.

Over-the-Air Split Machine Learning in Wireless MIMO Networks

no code implementations7 Oct 2022 Yuzhi Yang, Zhaoyang Zhang, Yuqing Tian, Zhaohui Yang, Chongwen Huang, Caijun Zhong, Kai-Kit Wong

In such a split ML system, the precoding and combining matrices are regarded as trainable parameters, while MIMO channel matrix is regarded as unknown (implicit) parameters.

Beamforming Design for the Performance Optimization of Intelligent Reflecting Surface Assisted Multicast MIMO Networks

no code implementations15 Aug 2022 Songling Zhang, Zhaohui Yang, Mingzhe Chen, Danpu Liu, Kai-Kit Wong, H. Vincent Poor

Then, substituting the expressions of the beamforming matrices of the BS and the users, the original sum-rate maximization problem can be transformed into a problem that only needs to optimize the phase shifts of the IRS.

Environment Sensing Considering the Occlusion Effect: A Multi-View Approach

no code implementations2 Jul 2022 Xin Tong, Zhaoyang Zhang, Yihan Zhang, Zhaohui Yang, Chongwen Huang, Kai-Kit Wong, Merouane Debbah

In this paper, we consider the problem of sensing the environment within a wireless cellular framework.

Analog Self-Interference Cancellation with Practical RF Components for Full-Duplex Radios

no code implementations21 Jun 2022 Jong Woo Kwak, Min Soo Sim, In-Woong Kang, Jaedon Park, Kai-Kit Wong, Chan-Byoung Chae

In this paper, we derive a closed-form expression for the SIC performance of the multi-tap circuit; we consider how the RF components must overcome such practical impairments as digitally-controlled attenuators, phase shifters, and PA. For a realistic performance analysis, we exploit the measured PA characteristics and carry out a 3D ray-tracing-based, system-level throughput analysis.

Safeguarding NOMA Networks via Reconfigurable Dual-Functional Surface under Imperfect CSI

no code implementations29 May 2022 Wen Wang, Wanli Ni, Hui Tian, Zhaohui Yang, Chongwen Huang, Kai-Kit Wong

This paper investigates the use of the reconfigurable dual-functional surface to guarantee the full-space secure transmission in non-orthogonal multiple access (NOMA) networks.

On the Diversity and Coded Modulation Design of Fluid Antenna Systems

no code implementations4 May 2022 Constantinos Psomas, Ghassan M. Kraidy, Kai-Kit Wong, Ioannis Krikidis

From a transceiver's standpoint, this can be materialized through the implementation of fluid antennas (FAs).


Beam Squint in Ultra-wideband mmWave Systems: RF Lens Array vs. Phase-Shifter-Based Array

no code implementations8 Dec 2021 Sang-Hyun Park, Byoungnam Kim, Dong Ku Kim, Linglong Dai, Kai-Kit Wong, Chan-Byoung Chae

In terms of the beam squint, we compare the proposed RF lens antenna with the phase shifter-based array for hybrid beamforming.

LEO Satellite Constellations for 5G and Beyond: How Will They Reshape Vertical Domains?

no code implementations18 Jun 2021 Shicong Liu, Zhen Gao, Yongpeng Wu, Derrick Wing Kwan Ng, Xiqi Gao, Kai-Kit Wong, Symeon Chatzinotas, Bjorn Ottersten

The rapid development of communication technologies in the past decades has provided immense vertical opportunities for individuals and enterprises.

Reconfigurable Intelligent Surface Aided Mobile Edge Computing: From Optimization-Based to Location-Only Learning-Based Solutions

no code implementations15 Feb 2021 Xiaoyan Hu, Christos Masouros, Kai-Kit Wong

In this paper, we explore optimization-based and data-driven solutions in a reconfigurable intelligent surface (RIS)-aided multi-user mobile edge computing (MEC) system, where the user equipment (UEs) can partially offload their computation tasks to the access point (AP).


User Cooperation for IRS-aided Secure SWIPT MIMO Systems

no code implementations9 Jun 2020 Gui Zhou, Cunhua Pan, Hong Ren, Kezhi Wang, Kok Keong Chai, Kai-Kit Wong

In this paper, intelligent reflecting surface (IRS) is proposed to enhance the physical layer security in the Rician fading channel where the angular direction of the eavesdropper is aligned with a legitimate user.

A Vision to Smart Radio Environment: Surface Wave Communication Superhighways

no code implementations28 May 2020 Kai-Kit Wong, Kin-Fai Tong, Zhiyuan Chu, Yangyang Zhang

Complementary to traditional approaches that focus on transceiver design for bringing the best out of unstable, lossy fading channels, one radical development in wireless communications that has recently emerged is to pursue a smart radio environment by using software-defined materials or programmable metasurfaces for establishing favourable propagation conditions.


Truly Intelligent Reflecting Surface-Aided Secure Communication Using Deep Learning

no code implementations7 Apr 2020 Yizhuo Song, Muhammad R. A. Khandaker, Faisal Tariq, Kai-Kit Wong, Apriana Toding

This paper considers machine learning for physical layer security design for communication in a challenging wireless environment.

BIG-bench Machine Learning

Model-Driven Beamforming Neural Networks

no code implementations15 Jan 2020 Wenchao Xia, Gan Zheng, Kai-Kit Wong, Hongbo Zhu

We also offer enhancement methods such as training-set augmentation and transfer learning in order to improve the generality of BNNs, accompanied by computer simulation results and testbed results showing the performance of such BNN solutions.

Transfer Learning

MIMO Transmission through Reconfigurable Intelligent Surface: System Design, Analysis, and Implementation

no code implementations20 Dec 2019 Wankai Tang, Jun Yan Dai, Ming Zheng Chen, Kai-Kit Wong, Xiao Li, Xinsheng Zhao, Shi Jin, Qiang Cheng, Tie Jun Cui

Reconfigurable intelligent surface (RIS) is a new paradigm that has great potential to achieve cost-effective, energy-efficient information modulation for wireless transmission, by the ability to change the reflection coefficients of the unit cells of a programmable metasurface.

Learning the Wireless V2I Channels Using Deep Neural Networks

no code implementations10 Jul 2019 Tian-Hao Li, Muhammad R. A. Khandaker, Faisal Tariq, Kai-Kit Wong, Risala T. Khan

For high data rate wireless communication systems, developing an efficient channel estimation approach is extremely vital for channel detection and signal recovery.

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