Search Results for author: Yunlong Cai

Found 36 papers, 7 papers with code

Meta-Learning-Driven Adaptive Codebook Design for Near-Field Communications

no code implementations10 Oct 2024 Mianyi Zhang, Yunlong Cai, Jiaqi Xu, A. Lee Swindlehurst

Specifically, we first design a deep neural network (DNN) to learn the near-field codebook.

Meta-Learning

What If We Had Used a Different App? Reliable Counterfactual KPI Analysis in Wireless Systems

no code implementations30 Sep 2024 Qiushuo Hou, Sangwoo Park, Matteo Zecchin, Yunlong Cai, Guanding Yu, Osvaldo Simeone

In modern wireless network architectures, such as Open Radio Access Network (O-RAN), the operation of the radio access network (RAN) is managed by applications, or apps for short, deployed at intelligent controllers.

Conformal Prediction counterfactual +1

Rate-Adaptive Generative Semantic Communication Using Conditional Diffusion Models

no code implementations4 Sep 2024 Pujing Yang, Guangyi Zhang, Yunlong Cai

In this letter, we propose a novel generative DJSCC approach using conditional diffusion models to enhance the perceptual quality of transmitted images.

Decoder Image Reconstruction +2

Learned Image Transmission with Hierarchical Variational Autoencoder

no code implementations29 Aug 2024 Guangyi Zhang, Hanlei Li, Yunlong Cai, Qiyu Hu, Guanding Yu, Runmin Zhang

In this paper, we introduce an innovative hierarchical joint source-channel coding (HJSCC) framework for image transmission, utilizing a hierarchical variational autoencoder (VAE).

Automatic AI Model Selection for Wireless Systems: Online Learning via Digital Twinning

1 code implementation22 Jun 2024 Qiushuo Hou, Matteo Zecchin, Sangwoo Park, Yunlong Cai, Guanding Yu, Kaushik Chowdhury, Osvaldo Simeone

This paper proposes a novel method for the online optimization of AMS mapping that corrects for the bias of the simulator by means of limited real data collected from the physical system.

Graph Neural Network Model Selection +1

Digital Wireless Image Transmission via Distribution Matching

no code implementations16 Jun 2024 Pujing Yang, Guangyi Zhang, Yunlong Cai

Firstly, we introduce a uniform modulation scheme, where the distance between two constellations is adjustable to match the non-uniform nature of the distribution.

From Analog to Digital: Multi-Order Digital Joint Coding-Modulation for Semantic Communication

no code implementations8 Jun 2024 Guangyi Zhang, Pujing Yang, Yunlong Cai, Qiyu Hu, Guanding Yu

Herein, we treat modulation/demodulation as a constrained quantization process and introduce scaling operations alongside manually crafted noise to approximate this process.

Dimensionality Reduction Quantization +1

Feature Allocation for Semantic Communication with Space-Time Importance Awareness

no code implementations26 Jan 2024 Kequan Zhou, Guangyi Zhang, Yunlong Cai, Qiyu Hu, Guanding Yu, A. Lee Swindlehurst

To tackle this challenge, we introduce a framework called Feature Allocation for Semantic Transmission (FAST), which offers adaptability to channel fluctuations across both spatial and temporal domains.

Attribute Semantic Communication

Deep Refinement-Based Joint Source Channel Coding over Time-Varying Channels

no code implementations26 Nov 2023 Junyu Pan, Hanlei Li, Guangyi Zhang, Yunlong Cai, Guanding Yu

This specialization poses a limitation, as their performance tends to wane in practical scenarios marked by highly dynamic channels, given that a fixed SNR inadequately represents the dynamic nature of such channels.

Alleviating Distortion Accumulation in Multi-Hop Semantic Communication

1 code implementation22 Aug 2023 Guangyi Zhang, Qiyu Hu, Yunlong Cai, Guanding Yu

To address the problem of distortion accumulation, we introduce a novel recursive training method for the encoder and decoder of semantic communication systems.

Decoder Semantic Communication

SCAN: Semantic Communication with Adaptive Channel Feedback

no code implementations27 Jun 2023 Guangyi Zhang, Qiyu Hu, Yunlong Cai, Guanding Yu

Then, since the images with lower reconstruction quality are generally less robust and need to be allocated with more communication resources, we propose a novel framework of Semantic Communication with Adaptive chaNnel feedback (SCAN).

Semantic Communication

Meta-Gating Framework for Fast and Continuous Resource Optimization in Dynamic Wireless Environments

no code implementations23 Jun 2023 Qiushuo Hou, Mengyuan Lee, Guanding Yu, Yunlong Cai

The proposed framework, consisting of an inner network and an outer network, aims to adapt to the dynamic wireless environment by achieving three important goals, i. e., seamlessness, quickness and continuity.

Image Classification Meta-Learning +2

Radar Sensing via OTFS Signaling

no code implementations20 Jun 2023 Kecheng Zhang, Zhongjie Li, Weijie Yuan, Yunlong Cai, Feifei Gao

By multiplexing information symbols in the delay-Doppler (DD) domain, orthogonal time frequency space (OTFS) is a promising candidate for future wireless communication in high-mobility scenarios.

One-shot Learning for Channel Estimation in Massive MIMO Systems

no code implementations9 Jun 2023 Kai Kang, Qiyu Hu, Yunlong Cai, Yonina C. Eldar

In this work, we propose a one-shot self-supervised learning framework for channel estimation in multi-input multi-output (MIMO) systems.

Denoising One-Shot Learning +1

Rate-Adaptive Coding Mechanism for Semantic Communications With Multi-Modal Data

no code implementations18 May 2023 Yangshuo He, Guanding Yu, Yunlong Cai

Based on the proposed framework, we further establish a general rate-adaptive coding mechanism for various types of multi-modal semantic tasks.

Decoder Semantic Communication

Deep-Unfolding for Next-Generation Transceivers

no code implementations15 May 2023 Qiyu Hu, Yunlong Cai, Guangyi Zhang, Guanding Yu, Geoffrey Ye Li

Then, some endeavors in applying deep-unfolding approaches in next-generation advanced transceiver design are presented.

Adaptive CSI Feedback for Deep Learning-Enabled Image Transmission

no code implementations27 Feb 2023 Guangyi Zhang, Qiyu Hu, Yunlong Cai, Guanding Yu

In particular, we develop a performance evaluator to predict the reconstruction quality of each image, so that the proposed scheme can adaptively decrease the CSI feedback overhead for the transmitted images with high predicted reconstruction qualities in the JSCC system.

Deep Learning

Design and Performance Analysis of Wireless Legitimate Surveillance Systems with Radar Function

no code implementations13 Feb 2023 Mianyi Zhang, Yinghui He, Yunlong Cai, Guanding Yu, Naofal Al-Dhahir

We seek to jointly optimize the receive and transmit beamforming vectors to maximize the eavesdropping success probability which is transformed into the difference of signal-to-interference-plus-noise ratios (SINRs) subject to the performance requirements of radar and surveillance.

Radar Sensing via OTFS Signaling: A Delay Doppler Signal Processing Perspective

no code implementations24 Jan 2023 Kecheng Zhang, Weijie Yuan, Shuangyang Li, Fan Liu, Feifei Gao, Pingzhi Fan, Yunlong Cai

The recently proposed orthogonal time frequency space (OTFS) modulation multiplexes data symbols in the delay-Doppler (DD) domain.

Simultaneously Transmitting and Reflecting (STAR) RIS Assisted Over-the-Air Computation Systems

no code implementations5 Jan 2023 Xiongfei Zhai, Guojun Han, Yunlong Cai, Yuanwei Liu, Lajos Hanzo

The performance of over-the-air computation (AirComp) systems degrades due to the hostile channel conditions of wireless devices (WDs), which can be significantly improved by the employment of reconfigurable intelligent surfaces (RISs).

Latency Minimization for mmWave D2D Mobile Edge Computing Systems: Joint Task Allocation and Hybrid Beamforming Design

no code implementations17 Jul 2022 Yanzhen Liu, Yunlong Cai, An Liu, MinJian Zhao, Lajos Hanzo

Mobile edge computing (MEC) and millimeter wave (mmWave) communications are capable of significantly reducing the network's delay and enhancing its capacity.

Edge-computing

Multiband Delay Estimation for Localization Using a Two-Stage Global Estimation Scheme

no code implementations20 Jun 2022 Yubo Wan, An Liu, Qiyu Hu, Mianyi Zhang, Yunlong Cai

In the coarse stage, we exploit the group sparsity structure of the multiband channel and propose a Turbo Bayesian inference (Turbo-BI) algorithm to achieve a good initial delay estimation based on a coarse signal model, which is transformed from the original multiband signal model by absorbing the carrier frequency terms.

Bayesian Inference

Robust Semantic Communications with Masked VQ-VAE Enabled Codebook

1 code implementation8 Jun 2022 Qiyu Hu, Guangyi Zhang, Zhijin Qin, Yunlong Cai, Guanding Yu, Geoffrey Ye Li

Although semantic communications have exhibited satisfactory performance for a large number of tasks, the impact of semantic noise and the robustness of the systems have not been well investigated.

Feature Importance Semantic Communication

A Unified Multi-Task Semantic Communication System with Domain Adaptation

no code implementations1 Jun 2022 Guangyi Zhang, Qiyu Hu, Zhijin Qin, Yunlong Cai, Guanding Yu

Simulation results demonstrate that our proposed U-DeepSC achieves comparable performance to the task-oriented semantic communication system designed for a specific task with significant transmission overhead reduction and much less number of model parameters.

Domain Adaptation Semantic Communication

Robust Semantic Communications Against Semantic Noise

no code implementations7 Feb 2022 Qiyu Hu, Guangyi Zhang, Zhijin Qin, Yunlong Cai, Guanding Yu, Geoffrey Ye Li

In this paper, we first propose a framework for the robust end-to-end semantic communication systems to combat the semantic noise.

Quantization Semantic Communication

DDPG-Driven Deep-Unfolding with Adaptive Depth for Channel Estimation with Sparse Bayesian Learning

no code implementations20 Jan 2022 Qiyu Hu, Shuhan Shi, Yunlong Cai, Guanding Yu

Furthermore, the proposed framework is extended to realize the adaptive depth of the general deep neural networks (DNNs).

Deep-Unfolding Beamforming for Intelligent Reflecting Surface assisted Full-Duplex Systems

no code implementations4 Dec 2021 Yanzhen Liu, Qiyu Hu, Yunlong Cai, Guanding Yu, Geoffrey Ye Li

Moreover, due to the high computational complexity caused by the matrix inversion computation in the SSCA-based optimization algorithm, we further develop a deep-unfolding neural network (NN) to address this issue.

Two-Timescale End-to-End Learning for Channel Acquisition and Hybrid Precoding

1 code implementation22 Oct 2021 Qiyu Hu, Yunlong Cai, Kai Kang, Guanding Yu, Jakob Hoydis, Yonina C. Eldar

To reduce the signaling overhead and channel state information (CSI) mismatch caused by the transmission delay, a two-timescale DNN composed of a long-term DNN and a short-term DNN is developed.

Latency Minimization in Intelligent Reflecting Surface Assisted D2D Offloading Systems

no code implementations12 Jan 2021 Yanzhen Liu, Qiyu Hu, Yunlong Cai, Markku Juntti

In this letter, we investigate an intelligent reflecting surface (IRS) aided device-to-device (D2D) offloading system, where an IRS is employed to assist in computation offloading from a group of users with intensive tasks to another group of idle users.

Channel Estimation for IRS-aided Multiuser Communications with Reduced Error Propagation

no code implementations9 Jan 2021 Yi Wei, Ming-Min Zhao, Min-Jian Zhao, Yunlong Cai

Intelligent reflecting surface (IRS) has emerged as a promising paradigm to improve the capacity and reliability of a wireless communication system by smartly reconfiguring the wireless propagation environment.

Joint Deep Reinforcement Learning and Unfolding: Beam Selection and Precoding for mmWave Multiuser MIMO with Lens Arrays

1 code implementation5 Jan 2021 Qiyu Hu, Yanzhen Liu, Yunlong Cai, Guanding Yu, Zhi Ding

In this work, we investigate the joint design of beam selection and digital precoding matrices for mmWave MU-MIMO systems with DLA to maximize the sum-rate subject to the transmit power constraint and the constraints of the selection matrix structure.

Stochastic Hybrid Combining Design for Quantized Massive MIMO Systems

no code implementations24 Aug 2020 Yalin Wang, Xihan Chen, Yunlong Cai, Lajos Hanzo

Both the power-dissipation and cost of massive multiple-input multiple-output (mMIMO) systems may be substantially reduced by using low-resolution analog-to-digital converters (LADCs) at the receivers.

Quantization Stochastic Optimization

Low-Complexity Joint Power Allocation and Trajectory Design for UAV-Enabled Secure Communications with Power Splitting

no code implementations23 Aug 2020 Kaidi Xu, Ming-Min Zhao, Yunlong Cai, Lajos Hanzo

An unmanned aerial vehicle (UAV)-aided secure communication system is conceived and investigated, where the UAV transmits legitimate information to a ground user in the presence of an eavesdropper (Eve).

Iterative Algorithm Induced Deep-Unfolding Neural Networks: Precoding Design for Multiuser MIMO Systems

1 code implementation15 Jun 2020 Qiyu Hu, Yunlong Cai, Qingjiang Shi, Kaidi Xu, Guanding Yu, Zhi Ding

Then, we implement the proposed deepunfolding framework to solve the sum-rate maximization problem for precoding design in MU-MIMO systems.

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