检索结果-内蒙古大学图书馆

CLEO: Applications and Technology in CLEO 2024, CLEO: A and T 2024 - Part of Conference on Lasers and Electro-Optics

作者： Han, Changhao Qin, Jun Yang, Qipeng Zheng, Zhao Shu, Haowen Zhang, Yunhao Wu, Yichen Sun, Yu Lu, Junde Zhou, Yan Ge, Zhangfeng Wang, Lei He, Zhixue Yu, Shaohua Hu, Weiwei Peng, Chao Bowers, John E. Wang, Xingjun State Key Laboratory of Advanced Optical Communications System and Networks School of Electronics Peking University Beijing100871 China Department of Electrical and Computer Engineering University of California Santa BarbaraCA93106 United States Key Laboratory of Information and Communication Systems Ministry of Information Industry Beijing Information Science and Technology University Beijing100192 China Frontiers Science Center for Nano-optoelectronics Peking University Beijing100871 China Peng Cheng Laboratory Shenzhen518055 China Peking University Yangtze Delta Institute of Optoelectronics Nantong226010 China

We experimentally demonstrate PAM-4 optical transmission beyond 224 Gbps based on an ultrahigh-bandwidth slow-light silicon modulator in C-band with the combination of the artificial neural network equalizers. © ... 详细信息

关键词： Light modulators

来源：评论

学校读者我要写书评

暂无评论

Fast Transceiver Design for RIS-Assisted MIMO mmWave Wireless Communications

arXiv

引用

arXiv 2024年

作者： Jing, Haiyue Cheng, Wenchi Xia, Xiang-Gen The State Key Laboratory of Integrated Services Networks Xidian University Xi’an710071 China Xidian University Xi’an710071 China The Department of Electrical and Computer Engineering University of Delaware NewarkDE19716 United States

Due to high bandwidth and small antenna size, millimeter-wave (mmWave) integrated line-of-sight (LOS) multiple-input-multiple-output (MIMO) systems have attracted much attention. Reconfigurable intelligent surfaces (RISs), which have the potential to change the characteristics of incident electromagnetic waves with low power cost, can improve the performance for the MIMO mmWave wireless communications. Uniform circular array (UCA) is an effective antenna structure with low complexity transceiver. In this paper, UCA based RIS-assisted MIMO mmWave wireless communications with transmit UCA, the RIS UCAs, and receive UCA are investigated. Since the rotation angles between the transceiver make the channel matrix noncirculant, an algorithm is developed to derive the ranges of the rotation angles based on an acceptable error and reduce the impact of rotation angles on channel matrix. Then, we propose a low-complexity precoding scheme at the transmitter, phase designs at the RIS UCAs, and a phase compensation scheme at the receiver, which can convert the channel matrix into an equivalent circulant channel matrix with a small error. Then, a fast symbol-wise maximum likelihood (ML) detection scheme is proposed to recover the signals with low computational complexity. Simulation results are presented to illustrate the theory. Copyright © 2024, The Authors. All rights reserved.

关键词： Maximum likelihood estimation

来源：评论

学校读者我要写书评

暂无评论

Contrastive MLP Network Based on Adjacent Coordinates for Cross-Domain Zero-Shot Hyperspectral Image Classification

引用

IEEE Transactions on Circuits and Systems for Video Technology 2025年

作者： Li, Jiaojiao Zhang, Zhiyuan Song, Rui Xu, Haitao Li, Yunsong Du, Qian Xidian University State Key Laboratory of Integrated Service Networks Xi’an710071 China CAS Key Laboratory of Spectral Imaging Technology Xi’an710119 China Chinese Academy of Sciences National Space Science Center China Mississippi State University Department of Electrical and Computer Engineering StarkvilleMS39762 United States

With the breakthrough of transfer learning and meta-learning, cross-domain few-shot hyperspectral image classification (CDFSL HSIC) technology has recently achieved satisfactory performance under limited annotations. Nevertheless, the most practical applications are zero-shot scenarios, which are intractable for CDFSL technology, such as the extraterrestrial detection scene, where unexplored objects are recognized by scientists to be more valuable for research. To conquer the zero-shot problem under domain shift, a two-stage contrastive MLP network (MAC-CDZS) is proposed, which constitutes a pioneering effort in the cross-domain zero-shot (CDZS) HSIC task. Firstly, given the remarkable performance of MLPs within a diminutive model size and their enhanced capacity for extracting spatial-spectral features of HSIs, the MLP framework has been strategically chosen as the foundational backbone of the first stage in the MAC-CDZS for facilitating efficient feature extraction. Secondly, to alleviate the potential category collapse, the second-stage fine-tuning framework is introduced, which extends the first-stage backbone by incorporating the elaborate adjacent coordinate module and contrastive learning paradigm for more harmonious classification performance. Specifically, the adjacent coordinate module is creatively designed to adequately mine the adjacent coordinates among samples for ameliorating category collapse from the perspective of grasping more reliable priors. Furthermore, a contrastive learning paradigm is innovatively constructed, comprising a Spatial Augmentation (SA) module tailored for hyperspectral patches and a construction strategy of sample pair under zero-shot conditions, which aims to boost the representation capability and alleviate the class collapse. The superior performance of the MAC-CDZS is demonstrated by experimental results on four benchmark datasets. © 2025 IEEE. All rights reserved.

关键词： Zero-shot learning

来源：评论

学校读者我要写书评

暂无评论

PAM-4 optical transmission beyond 224 Gbps based on an ultrahigh-bandwidth slow-light silicon modulator

PAM-4 optical transmission beyond 224 Gbps based on an ultra...

引用

2024 Conference on Lasers and Electro-Optics, CLEO 2024

作者： Han, Changhao Qin, Jun Yang, Qipeng Zheng, Zhao Shu, Haowen Zhang, Yunhao Wu, Yichen Sun, Yu Lu, Junde Zhou, Yan Ge, Zhangfeng Wang, Lei He, Zhixue Yu, Shaohua Hu, Weiwei Peng, Chao Bowers, John E. Wang, Xingjun State Key Laboratory of Advanced Optical Communications System and Networks School of Electronics Peking University Beijing100871 China Department of Electrical and Computer Engineering University of California Santa BarbaraCA93106 United States Key Laboratory of Information and Communication Systems Ministry of Information Industry Beijing Information Science and Technology University Beijing100192 China Frontiers Science Center for Nano-Optoelectronics Peking University Beijing100871 China Peng Cheng Laboratory Shenzhen518055 China Peking University Yangtze Delta Institute of Optoelectronics Nantong226010 China

ISBN: (纸本)9781957171395

关键词： Silicon photonics

来源：评论

学校读者我要写书评

暂无评论

Intelligent Intra- and Inter-Channel Nonlinearity Compensation for Terabit-Per-Lambda 16QAM Long-Haul Transmission

Intelligent Intra- and Inter-Channel Nonlinearity Compensati...

引用

Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Xiansong Fang Lingjun Zhou Yixiao Zhu Jiayu Zheng Xiang Cai Fan Zhang State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Peking University Beijing China School of Electronic and Computer Engineering Peking University Shenzhen China State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China Pengcheng Laboratory Shenzhen China

We experimentally demonstrate the combination of learned modified DBP and adaptive equalizer to compensate for intra- and inter-channel nonlinearity, in an $8\times 125\text{Gbaud}$ 16QAM system over 1600km SSMF, sh...

关键词：

来源：评论

学校读者我要写书评

暂无评论

Design of Integrated Substrate Gap Waveguide 3-dB Rectangular-Junction Couplers 4

Design of Integrated Substrate Gap Waveguide 3-dB Rectangula...

引用

4th International Applied Computational Electromagnetics Society Symposium in China, ACES-China 2021

作者： Yang, Ruitian Ren, Wenping Shen, Dongya Zhang, Xiupu Yunnan Provincial Engineering Laboratory of Cloud Wireless Access Heterogeneous Networks Yunnan University Kunming China IPhotonics Labs Concordia University Department of Electrical and Computer Engineering MontrealQuebec Canada

ISBN: (纸本)9781733509619

A 3-dB rectangular-junction directional coupler is designed using integrated substrate gap waveguide (ISGW) technology. The coupler uses the odd mode and even mode of Q-TEM to phase difference of 90°. The proposed coupler has a coupling ratio of 3.8pm 0.5text{dB}, a phase deviation within 2.5° around 90°, above 20dB isolation and return loss from 27.8GHz to 33.2GHz centered at 30GHz. © 2021 Applied Computational Electromagnetics Society (ACES).

关键词： Millimeter waves

来源：评论

学校读者我要写书评

暂无评论

A Simple Channel Independent Beamforming Scheme With Parallel Uniform Circular Array

arXiv

引用

arXiv 2024年

In this letter, we consider a uniform circular array (UCA)-based line-of-sight multiple-input-multiple-output system, where the transmit and receive UCAs are parallel but non-coaxial with each other. We propose a simple channel-independent beamforming scheme with fast symbol-wise maximum likelihood detection. Copyright © 2024, The Authors. All rights reserved.

关键词： Beamforming

来源：评论

学校读者我要写书评

暂无评论

Bandpass Filtering Power Divider with High Selectivity and Wide Stopband Based on Integrated Substrate Gap Waveguide

Bandpass Filtering Power Divider with High Selectivity and W...

引用

2021 International Conference on Electronics, Circuits and Information engineering, ECIE 2021

作者： He, Weida Shen, Dongya Zhang, Xiupu Ruan, Zhidong Yunnan University Yunnan Provincial Engineering Laboratory of Cloud Wireless Access Heterogeneous Networks Kunming China Concordia University IPhotonics Labs Department of Electrical and Computer Engineering MontrealQC Canada

ISBN: (纸本)9781665418690

A bandpass filtering power divider (FPD) using integrated substrate gap waveguide (ISGW) technology is proposed, which has high selectivity and wide stopband. The filtering power divider includes three-layer substrates. The top layer substrate realizes a perfect magnetic conductor (PMC) using periodic plated vias and metallic patches. It is applied for packaging filter power divider composed of substrate integrated waveguide (SIW) and microstrip to avoid interference and losses induced by external radiation emission and internal radiation leakage. The middle layer substrate generates a gap layer. and the bottom layer substrate etch the slots on the metal plane and place a metal through hole in the middle of the metal layer to generate resonance and transmission zeros, and connect the microstrip to form a filter power divider circuit. The results show that FPD has multiple transmission zeros, the passband is 13.2 to 15.5 GHz, and an insertion loss of -4 dB. The return loss in the passband is less than -15 dB, and the isolation below is -16.5 dB. © 2021 IEEE.

关键词： Substrates

来源：评论

学校读者我要写书评

暂无评论

Split Fine-Tuning for Large Language Models in Wireless networks

arXiv

引用

arXiv 2025年

作者： Zhang, Songge Cheng, Guoliang Huang, Xinyu Li, Zuguang Wu, Wen Song, Lingyang Shen, Xuemin School of Electronic and Computer Engineering Peking University Shenzhen518000 China Frontier Research Center Pengcheng Laboratory Shenzhen518055 China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing100871 China School of Electronic and Computer Engineering Peking University Shenzhen Graduate School Shenzhen518055 China Department of Electrical and Computer Engineering University of Waterloo WaterlooN2L 3G1 Canada

Fine-tuning is the process of adapting the pre-trained large language models (LLMs) for downstream tasks. Due to substantial parameters, fine-tuning LLMs on mobile devices demands considerable memory resources, and suffers from high communication overhead and long fine-tuning delay. In this paper, we propose an efficient LLM fine-tuning scheme in wireless networks, named Split Fine-Tuning (SFT), which can accommodate LLM fine-tuning on mobile devices. Specifically, an LLM is split into a server-side part on the edge server and a device-side part on the mobile device to satisfy the device-side memory constraint. All devices share a server-side model and perform parallel fine-tuning to reduce fine-tuning delay. In addition, to reduce significant communication overhead incurred by data exchange between devices and the edge server, we propose a data compression scheme by jointly leveraging sparsification, stochastic quantization, and lossless encoding methods. Furthermore, we formulate a fine-tuning delay minimization problem under accuracy and memory constraints, taking device heterogeneity and channel dynamics into account. To solve the problem, the nonlinear mixed-integer problem is decoupled into two subproblems in different timescales. The two-timescale resource management algorithm is proposed to jointly optimize the compression rate and transformer block allocation in the large timescale using the augmented Lagrangian method, and determine spectrum resource allocation in the small timescale via sequential quadratic programming. Extensive simulation results demonstrate that the proposed scheme can reduce the fine-tuning delay by up to 80.2% and communication overhead by 93.6% compared to state-of-the-art benchmarks, while satisfying device-side memory and model accuracy constraints. Copyright © 2025, The Authors. All rights reserved.

关键词： Quadratic programming

来源：评论

学校读者我要写书评

暂无评论

Source Camera Device Identification Combining Sensor Intrinsic Features and Tag

Source Camera Device Identification Combining Sensor Intrins...

引用

International Conference on Networking and Network Applications (NaNA)

作者： Hui Tian Haibao Chen Yuyan Zhao Pinchang Zhang Yan Xu Yangyang Liu School of Computer Science and Technology Anhui University Hefei China School of Computer and Information Engineering Chuzhou University Chuzhou China School of Computer Science Nanjing University of Posts and Telecommunications Nanjing China State Key Laboratory of Integrated Services Networks (Xidian University) Xi’an China School of Computer Science and Technology Xidian University Xi’an China

ISBN: (数字)9798350376777

ISBN: (纸本)9798350376784

Source camera identification method is crucial in digital image forensics for determining the authentic source of an image. In this paper, we propose a new source camera identification method by combining the intrinsic features of the camera with a carefully designed tag. Our method establishes a hybrid fingerprint model involving two parameters as the unique camera fingerprints of a digital image. Utilizing hypothesis testing theory, we develop a generalized likelihood ratio test (GLRT) to identify the source camera of digital images. Finally, we provide numerical results to validate the performance of the proposed method and demonstrate its effectiveness in identifying source camera devices.

关键词： Performance evaluation Digital images Forensics Fingerprint recognition Cameras Numerical models Object recognition

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：