Search Results for author: Kok Keong Chai

Found 8 papers, 0 papers with code

Over-the-Air Federated Averaging with Limited Power and Privacy Budgets

no code implementations5 May 2023 Na Yan, Kezhi Wang, Cunhua Pan, Kok Keong Chai, Feng Shu, Jiangzhou Wang

We aim to improve the learning performance by jointly designing the device scheduling, alignment coefficient, and the number of aggregation rounds of federated averaging (FedAvg) subject to sum power and privacy constraints.

Federated Learning Scheduling

Performance Analysis and Low-Complexity Design for XL-MIMO with Near-Field Spatial Non-Stationarities

no code implementations31 Mar 2023 Kangda Zhi, Cunhua Pan, Hong Ren, Kok Keong Chai, Cheng-Xiang Wang, Robert Schober, Xiaohu You

Our analytical results indicate that a limited part of the XL-array receives the majority of the signal power in the near field, which leads to a notion of visibility region (VR) of a user.

Device Scheduling for Over-the-Air Federated Learning with Differential Privacy

no code implementations31 Oct 2022 Na Yan, Kezhi Wang, Cunhua Pan, Kok Keong Chai

The scheme schedules the devices with better channel conditions in the training to avoid the problem that the alignment coefficient is limited by the device with the worst channel condition in the system.

Federated Learning Scheduling

Toward Secure and Private Over-the-Air Federated Learning

no code implementations14 Oct 2022 Na Yan, Kezhi Wang, Kangda Zhi, Cunhua Pan, Kok Keong Chai, H. Vincent Poor

In this paper, a novel secure and private over-the-air federated learning (SP-OTA-FL) framework is studied where noise is employed to protect data privacy and system security.

Federated Learning Scheduling +1

Active RIS Versus Passive RIS: Which Is Superior with the Same Power Budget?

no code implementations14 Dec 2021 Kangda Zhi, Cunhua Pan, Hong Ren, Kok Keong Chai, Maged Elkashlan

This letter theoretically compares the active reconfigurable intelligent surface (RIS)-aided system with the passive RIS-aided system.

Meta-learning for RIS-assisted NOMA Networks

no code implementations4 Nov 2021 Yixuan Zou, Yuanwei Liu, Kaifeng Han, Xiao Liu, Kok Keong Chai

Extensive simulation results demonstrate that the proposed QoS-based NOMA network achieves significantly higher transmission throughput compared to the conventional orthogonal multiple access (OMA) network.

Clustering Meta-Learning

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.

Robust Transmission Design for Intelligent Reflecting Surface Aided Secure Communication Systems with Imperfect Cascaded CSI

no code implementations24 Apr 2020 Sheng Hong, Cunhua Pan, Hong Ren, Kezhi Wang, Kok Keong Chai, Arumugam Nallanathan

To minimize the transmit power, the beamforming vector at the transmitter, the AN covariance matrix, and the IRS phase shifts are jointly optimized subject to the outage rate probability constraints under the statistical cascaded channel state information (CSI) error model that usually models the channel estimation error.

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