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15th IEEE International Conference on Wireless Communications and Signal Processing, WCSP 2023

作者： Yao, Zhiwei Zhao, Ming Beijing National Research Center for Information Science and Technology Beijing China Tsinghua University Department of Electronic Engineering Beijing China

ISBN: (纸本)9798350324662

Unsupervised learning is an emerging technique in the field of signal processing that allows for autonomous feature learning without reliance on annotated data. In this paper, we propose a novel unsupervised learning network to address the challenges of Direction-of-Arrival (DoA) estimation in indoor localization for the Internet of Things (IoT). Our focus is on resolving the issue of inadequate DoA estimation performance in complex scenarios. The proposed network is based on a multilayer and multi-path feature extraction approach. We employ a multi-layer feature extraction approach to separately extract general and specialized features, and then implement multi-path feature extraction to extract different parameters. Through the design of multi-layer and multi-path, we can improve the estimation performance of the network. In addition, considering the impact of noise on the estimation performance of the network, we devise a novel decoding scheme in the decoder module, further enhancing the performance of the network. Simulation results demonstrate the superiority of the proposed method over existing approaches in terms of DoA estimation performance. © 2023 IEEE.

关键词： deep neural network Direction-of-Arrival estimation Internet of Things unsupervised learning

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Construction of a Digital Integrated Circuit Backend Design System Based on Machine Learning

Construction of a Digital Integrated Circuit Backend Design ...

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International Conference on Smart Applications and Sustainability in the Artificial Intelligence of Things, SAS-AIoT 2024

作者： Lin, Kongcheng Sun, Xiyan Ji, Yuanfa School of Information and Communication Guilin University of Electronic Technology Guangxi541004 China Guangxi Key Laboratory of Precision Navigation Technology and Application Guilin University of Electronic Technology Guangxi541004 China Nation & Local Joint Engineering Research Center of Satellite Navigation Positioning and Technology Guilin University of Electronic Technology Guangxi541004 China

ISBN: (纸本)9783031782756

With the increasing complexity of integrated circuit (IC) design, traditional backend design methods have become increasingly difficult to meet the requirements, and there is an urgent need for new technological means to improve system design efficiency and reduce system errors. This article can be based on machine learning to reconstruct the backend IC design process, and intelligently analyze and identify it, in order to optimize the layout and wiring. By predicting and optimizing the layout, signal transmission delay and power consumption can be effectively reduced, thereby improving the overall performance of the IC. In cross technology node testing, from the perspective of failure rate, as the number of technology nodes decreases, the failure rate gradually decreases, ranging from 1.5% to 55%. The research results of this article can greatly improve the design accuracy and processing speed of chips, while also greatly reducing the power consumption and cost of chips, providing a new approach for IC design. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Failure rate

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Real-Time Lightweight Convolutional Neural Network for Polyp Detection in Endoscope Images

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Journal of Shanghai Jiaotong University (Science) 2025年第3期30卷 521-534页

作者： Si, Bingqi Pang, Chenxi Wang, Zhiwu Jiang, Pingping Yan, Guozheng School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai200240 China Shanghai Engineering Research Center of Intelligent Drug Detoxification and Rehabilitation Shanghai200240 China College of Computer Science and Technology Jilin University Changchun130012 China

Colorectal cancer is the most common cancer with a second mortality rate. Polyp lesion is a precursor symptom of colorectal cancer. Detection and removal of polyps can effectively reduce the mortality of patients in the early period. However, mass images will be generated during an endoscopy, which will greatly increase the workload of doctors, and long-term mechanical screening of endoscopy images will also lead to a high misdiagnosis rate. Aiming at the problem that computer-aided diagnosis models deeply depend on the computational power in the polyp detection task, we propose a lightweight model, coordinate attention-YOLOv5-Lite-Prune, based on the YOLOv5 algorithm, which is different from state-of-the-art methods proposed by the existing research that applied object detection models or their variants directly to prediction task without any lightweight processing, such as faster region-based convolutional neural networks, YOLOv3, YOLOv4, and single shot multibox detector. The innovations of our model are as follows: First, the lightweight EfficientNetLite network is introduced as the new feature extraction network. Second, the depthwise separable convolution and its improved modules with different attention mechanisms are used to replace the standard convolution in the detection head structure. Then, the α-intersection over union loss function is applied to improve the precision and convergence speed of the model. Finally, the model size is compressed with a pruning algorithm. Our model effectively reduces parameter amount and computational complexity without significant accuracy loss. Therefore, the model can be successfully deployed on the embedded deep learning platform, and detect polyps with a speed above 30 frames per second, which means the model gets rid of the limitation that deep learning models must rely on high-performance servers. © Shanghai Jiao Tong University 2023.

关键词： Object detection

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Parallel Implementation of the CCSDS Turbo Decoder on GPU

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China Communications 2024年第10期21卷 70-77页

作者： Liu Zhanxian Liu Rongke Zhang Haijun Wang Ning Sun Lei Wang Jianquan School of Computer&Communication Engineering University of Science and Technology BeijingBeijing 100083China School of Electronic and Information Engineering Beihang UniversityBeijing 100191China Beijing Engineering and Technology Research Center for Convergence Networks and Ubiquitous Services Institute of Artificial IntelligenceUniversity of Science and Technology BeijingBeijing 100083China School of Information Engineering Zhengzhou UniversityZhengzhou 450001China School of Automation and Electrical Engineering University of Science and Technology BeijingBeijing 100083China

This paper presents a software turbo decoder on graphics processing units(GPU).Unlike previous works,the proposed decoding architecture for turbo codes mainly focuses on the Consultative Committee for Space Data Systems(CCSDS)***,the information frame lengths of the CCSDS turbo codes are not suitable for flexible sub-frame parallelism *** mitigate this issue,we propose a padding method that inserts several bits before the information frame *** obtain low-latency performance and high resource utilization,two-level intra-frame parallelisms and an efficient data structure are *** presented Max-Log-Map decoder can be adopted to decode the Long Term Evolution(LTE)turbo codes with only small *** proposed CCSDS turbo decoder at 10 iterations on NVIDIA RTX3070 achieves about 150 Mbps and 50Mbps throughputs for the code rates 1/6 and 1/2,respectively.

关键词： CCSDS CUDA GPU parallel decoding turbo codes

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Accelerated SF-PPP Convergence of BDS-3 B1 Band by Wideband Signal Observations 36

Accelerated SF-PPP Convergence of BDS-3 B1 Band by Wideband ...

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36th International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS+ 2023

作者： Qi, Yunhan Yao, Zheng Lu, Mingquan Department of Electronic Engineering Tsinghua University Beijing China Beijing National Research Center for Information Science and Technology Beijing China

ISBN: (纸本)9780936406350

The third-generation BeiDou Navigation Satellite System (BDS-3) officially provided Positioning, Navigation, and Timing (PNT) services to global users in 2020. BDS-3 B1 band not only retains the B1I signal broadcast at 1561.098 MHz, but also broadcast a new B1C signal with advanced modulation at 1575.42 MHz, which provides more various options for the PNT service of BDS-3 B1 band. In terms of high-precision positioning, although the Single Frequency Precise Point Positioning (SF-PPP) of the B1 band can provide centimeter-level positioning results, it requires serval hours of convergence time, which cannot meet the requirements of real-time applications. Therefore, in order to accelerate the convergence speed of B1 SF-PPP, unlike existing methods that focus on reducing the impact of atmospheric delays, this paper fully explores the excellent potential of the B1 wideband signal composed of B1I and B1C signals in anti-thermal noise and anti-multipath, and innovatively introduces the B1 wideband signal observations with higher precisions than B1I and B1C observations to B1 SF-PPP for the first time. The real-data experiment results show that, compared with the B1 SF-PPP using B1I and B1C observations, the B1 SF-PPP using B1 wideband signal observations has a significantly reduced convergence time, which is shortened by 43.2% and 33.7% respectively when convergence threshold is 2.5 dm, demonstrating the effectiveness of B1 wideband signal observations in accelerating B1 SF-PPP convergence. © 2023 Proceedings of the 36th International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS+ 2023. All rights reserved.

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RISMCNet: A Two-Timescale CSI Feedback Solution for RIS-aided Multi-Carrier systems 6

RISMCNet: A Two-Timescale CSI Feedback Solution for RIS-aide...

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6th International Conference on electronics technology, ICET 2023

作者： Tang, Xinyi Xiao, Limin Zhao, Ming Li, Yunzhou Beijing National Research Center for Information Science and Technology Beijing China Tsinghua University Department of Electronic Engineering Beijing China

ISBN: (纸本)9798350337693

In this letter, a novel deep learning-based solution named RISMCNet is introduced to tackle the challenge of high overhead and low accuracy in RIS-aided multi-carrier communication channel state information (CSI) feedback. The proposed method utilizes the two-timescale feature of the RIS-aided systems by designing separate feedback periods for the base station (BS)-RIS and RIS-user equipment (UE) channels. RISM-CNet leverages the sparsity of the angular-delay domain channel and apply an attention-based encoder at the UE end to compress the channel for limited feedback overhead. A multi-resolution decoder is designed at the BS end to recover high-precision CSI. Simulations results reveal that RISMCNet outperforms conventional compressive sensing (CS)-based and deep learning-based methods in CSI recovery accuracy. Moreover, RISMCNet achieves 270 to 810 times faster running times compared to CS-based methods. © 2023 IEEE.

关键词： Channel state information

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A novel SAR sparse imaging algorithm based on low rank matrix completion

A novel SAR sparse imaging algorithm based on low rank matri...

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2024 Conference on Spectral technology and Applications, CSTA 2024

作者： Xie, Feihong Deng, Honggao Xie, Ningbo Liao, Kefei Liao, Guisheng Chen, Hanbo Ouyang, Shan School of Information and Communication Guilin University of Electronic Technology Guangxi Guilin541004 China State and Local Joint Engineering Research Center for Satellite Navigation and Location Service Guilin University of Electronic Technology Guangxi Guilin541004 China

ISBN: (纸本)9781510683082

Due to the complex electromagnetic environment, the airborne Synthetic Aperture Radar (SAR) system is faced with the challenge of missing part of the echo data, leading to the degradation on SAR imaging performance. To solve this problems, a novel SAR sparse imaging algorithm based on low rank matrix completion is proposed in this paper. Based on the mechanism of joint aperture and bandwidth synthesis, a two-dimensional BP-based SAR sparse imaging model is constructed at first. And then, on the basis of the above model,the concept of low rank matrix completion is introduced in this paper,to reconstruct the missing elements of the SAR signals in the frequency domain, due to the sparse sampling. Specifically, the sparse signal reconstruction problem is transformed into a regularized least squares optimization problem. Which can be solved iteratively by using the imprecise augmented Lagrange multiplier (IALM) method alternately. Therefore, the issue of failure for compressed sensing based sparse imaging under low sampling rate can be resolved effectively. Numerical results demonstrate the effectiveness of the proposed method, and it also shows that the Integrated Side Lobe Ratio (ISLR) of the proposed algorithm is lower than that of the existed methods. © 2024 SPIE.

关键词： Lagrange multipliers

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Imperfect-Spectrum-Sensing-Aware DRL-Based Dynamic Spectrum Access for Underlay Satellite Systems with Multiple Primary Transmit Power Levels Sensing 2

Imperfect-Spectrum-Sensing-Aware DRL-Based Dynamic Spectrum ...

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2nd International Conference on Frontiers of Communications, information System and Data Science, CISDS 2023

作者： Yu, Boren Yang, Kunze Ni, ZuYao Su, Ming Information Science and Technology Xiamen University Department of Electronic Science Xiamen China Tsinghua University Department of Electronic Engineering Beijing China Tsinghua University Beijing National Research Center for Information Science and Technology Beijing China

ISBN: (纸本)9798350381474

This paper investigates a dynamic spectrum access (DSA) scheme for the underlay scenario of coexistence between geostationary orbit (GSO) and nongeostationary orbit (NGSO) satellite systems, in which NGSO satellites can estimate the status of GSO satellites via spectrum sensing to avoid interfering with GSO systems when selecting a spectrum sharing strategy. However, in practice, an NGSO system cannot obtain completely correct information because of sensing errors. Therefore, the DSA problem considering imperfect spectrum sensing is regarded as a partially observable Markov decision process (POMDP) in this work. A deep reinforcement learning (DRL)- based algorithm is proposed to update the access strategy of the NGSO system every slot, including channel selection and power control. In addition, a more practical scenario in which the GSO satellites transmit with multiple power levels is considered in the proposed DSA scheme. We simulate the proposed algorithm in several sensing cases in which different capabilities and accuracies of NGSO spectrum sensing are considered, and the simulation results prove the effectiveness and superiority of the proposed DRL-based DSA algorithm. © 2023 IEEE.

关键词： Reinforcement learning

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Realizing high thermoelectric performance for p-type SiGe in medium temperature region via TaC compositing

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Journal of Materiomics 2023年第5期9卷 984-991页

作者： Zheng Fan JiSheng Liang Jun-Liang Chen Ying Peng Huajun Lai Jian Nong Chengyan Liu Wangyang Ding Lei Miao Guangxi Key Laboratory for Relativity Astrophysics State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite StructuresSchool of Physical Science and TechnologyGuangxi UniversityNanning530004China Engineering Research Center of Electronic Information Materials and Devices Ministry of EducationGuangxi Key Laboratory of Information MaterialGuilin University of Electronic TechnologyGuilin541004China Guangxi Key Laboratory of Precision Navigation Technology and Application Guilin University of Electronic TechnologyGuilin541004China Guangxi Academy of Sciences Nanning530007China

SiGe is recognised as an excellent thermoelectric material with superior mechanical properties and thermal stability in regions with high *** study explores a novel strategy for coregulating thermoelectric transport parameters to achieve high thermoelectric properties of p-type SiGe in the mid-temperature region by incorporating nano-TaC into SiGe combined ball milling with spark plasma *** optimizing the amount of TaC in the SiGe matrix,the power factors were significantly increased due to the modulation doping effect based on the work function matching of SiGe with ***,the ensemble effect of the nanostructure leads to a significant decrease in thermal ***,a high ZT of 1.06 was accomplished at 873 K,which is 64%higher than that of typical radioisotope thermoelectric *** research offers a novel strategy for expanding and enhancing the thermoelectric properties of SiGe materials in the medium temperature range.

关键词： SiGe Thermoelectric Work function matching Modulation doping effect Phonon scattering

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Two efficient beamforming methods for hybrid IRS-aided AF relay wireless networks

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Science China(information Sciences) 2025年第4期68卷 363-379页

作者： Xuehui WANG Qingbo LI Wen ZHU Feng SHU Mengxing HUANG Fuhui ZHOU Riqing CHEN Cunhua PAN Yongpeng WU Jiangzhou WANG School of Mathematics and Statistics Hainan Normal University Key Laboratory of Data Science and Smart Education Ministry of Education Hainan Normal University School of Information and Communication Engineering Hainan University Collaborative Innovation Center of Information Technology Hainan University School of Electronic and Optical Engineering Nanjing University of Science and Technology College of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics Digital Fujian Institute of Big Data for Agriculture Fujian Agriculture and Forestry University National Mobile Communications Research Laboratory Southeast University Shanghai Key Laboratory of Navigation and Location Based Services Shanghai Jiao Tong University School of Engineering University of Kent

Owing to its ability to mitigate the double-fading effect by amplifying the reflected signal, the active intelligent reflecting surface(IRS) has garnered significant attention. In this paper, an amplify-and-forward(AF) relay network assisted by a hybrid IRS consisting of both passive and active units is developed. A signal-to-noise ratio(SNR) maximization problem is formulated, where the AF relay beamforming matrix and the hybrid IRS reflecting coefficient matrices for two-time slots need to be optimized. To address the SNR maximization problem, this paper proposes both a high-performance(HP) method and a low-complexity(LC) method. The HP method is based on the semidefinite relaxation and fractional programming(SDR-FP)algorithm, with rank-1 solutions obtained through Gaussian randomization. For the LC method, the amplification coefficient of each active IRS element is assumed to be equal. The SNR maximization problem is then addressed using the whitening filter,generalized power iteration, and generalized Rayleigh-Ritz(WF-GPI-GRR) approach. Simulation results show that compared with the benchmarks, such as the passive IRS-aided AF relay network, the proposed HP-SDR-FP and WF-GPI-GRR methods achieve significant rate improvements. In particular, the HP-SDR-FP and WF-GPI-GRR methods yield more than a 135.0%rate gain when the transmit power Ps of the source is 10 dBm. Furthermore, the proposed HP-SDR-FP method outperforms the WF-GPI-GRR method in terms of rate performance.

关键词： double-fading intelligent reflecting surface active elements passive elements hybrid IRS AF relay

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