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Hybrid near- and far-field three-stage beam training with beam split for RIS-assisted OFDM communications

Frontiers of Information Technology & Electronic Engineering 2024年第12期25卷 1664-1678页

作者： Zhichao CHENG Shupei ZHANG Shu FU Boya DI School of Electronics Engineering and Computer Science Peking UniversityBeijing 100871China State Key Laboratory of Advanced Optical Communication Systems and Networks School of ElectronicsPeking UniversityBeijing 100871China Department of Microelectronics and Communication Engineering Chongqing UniversityChongqing 400044China

With the development of millimeter-wave(mmWave)communication systems,large-scale reconfigurable intelligent surfaces(RISs)have gained considerable attention as a promising technology for signal strength enhancement and coverage ***,as the antenna scale and bandwidth increase,RIS-assisted wideband orthogonal frequency division multiplexing(OFDM)communication systems face challenges due to the near-field range expansion and the beam split effect over the high-frequency band,complicating the acquisition of channel state information(CSI).To tackle these challenges,we present a codebook-based three-stage beam training scheme by using the beam split effect to bypass CSI ***,by analyzing the beam split effect in RIS-assisted OFDM communication systems,we propose a beam-split-aware codebook capable of covering both the near and far fields with fewer codewords compared to conventional narrow-band *** such a codebook,a three-stage beam training mechanism is adopted to obtain the optimal codeword with low time overhead,thereby facilitating subsequent *** results demonstrate that the proposed scheme outperforms existing near-and far-field codebook-based schemes in terms of the beam training resolution and sum rate in the hybrid near–far field.

关键词： Near-far field Beam split Codebook design Beam training Reconfigurable intelligent surfaces

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Parallel coherent LiDAR with low hardware requirements

Parallel coherent LiDAR with low hardware requirements

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Wang, Long Xie, Kunfeng Hu, Liang Chen, Jianping Wu, Kan Jiao, Wenhai Wu, Guiling State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Long University Shanghai200240 China Beijing Institute of Tracking and Telecommunication Technology Beijing100094 China

A high-performance parallel coherent LiDAR based on phase-coded subcarrier modulation with record-high imaging rate and high ranging precision is demonstrated, which also breaks through the high-hardware requirements ... 详细信息

ISBN: (纸本)9781957171258

关键词： optical radar

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Sensing-communication-Computation Integration for Federated Edge Learning with Controllable Model Dropout

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IEEE Internet of Things Journal 2025年第12期12卷 19767-19781页

作者： Jiao, Xiang Zhu, Guangxu Jiang, Wei Chen, Li Luo, Wu Wen, Dingzhu State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing China Shenzhen Research Institute of Big Data Shenzhen China The State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing China The CAS Key Laboratory of Wireless Optical Communication University of Science and Technology of China Hefei China Network Intelligence Center School of Information Science and Technology ShanghaiTech University Shanghai China

FEderated Edge Learning (FEEL) is an advanced paradigm in edge artificial intelligence, enabling privacy-preserving collaborative model training through periodic communication between edge devices and a central server. FEEL involves three key processes: sensing, computation, and communication for data acquisition, processing, and exchange, respectively. Due to limited system resources, optimizing each process individually may lead to suboptimal learning performance. This challenge has sparked research into Integrated Sensing-Computation-communication (ISCC) design for enhanced FEEL. While previous work has optimized general learning parameters such as batch size and computing frequency, there is a lack of customized designs considering the neural network architecture as an optimizable variable in ISCC for FEEL. To close this gap, we introduce a novel design where each device generates a sub-model through controllable weight dropout, adding flexibility by directly manipulating the learning process and reducing computation and communication overhead. To guide ISCC resource allocation in this new setting, we present a comprehensive convergence analysis, revealing the tight coupling of sensing, computation, and communication across devices and their impact on FEEL convergence. Building on these theoretical insights, we formulate an ISCC problem aiming to maximize the FEEL convergence rate through joint optimization of variables such as batch size, sensing power, dropout rate, and communication power. This non-convex problem is decomposed into two sub-problems via alternating optimization: one controls batch size using a sorting algorithm, while the other focuses on ISCC device parameters, transformable into a convex problem solved by successive convex approximation. Extensive experiments using human motion recognition datasets demonstrate the superiority of the proposed design over baseline schemes. © 2014 IEEE.

关键词： Federated learning

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Chip-Scale optical Clock Scheme Based on Dual-Wavelength Modulation Transfer Spectroscopy

Chip-Scale Optical Clock Scheme Based on Dual-Wavelength Mod...

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IEEE International Frequency Control Symposium

作者： Jie Miao Qiaohui Yang Jiqing Lian Tianyu Liu Duo Pan Jingbiao Chen Department of Electronics State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Mechano-Electronic Engineering Xidian University Xi’an China State Key Laboratory of Advanced Optical Communication Systems and Networks Lanzhou Institute of Physics Lanzhou China

In this paper we propose a new scheme to realize the chip-scale optical clock by using a dual-wavelength modulation transfer spectroscopy (DWMTS). The electro-optical modulator (EOM) and isolator in conventional modulation transfer spectroscopy which is complicated to be built on chip can thus be avoided. We remove the EOM and isolator at the price of an extra laser, which perform the volume optimization of the entire optical system, making the optical clock based on DWMTS to be a competitive candidate.

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External Cavity Laser for Chip-Scale Atomic Clock

External Cavity Laser for Chip-Scale Atomic Clock

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IEEE International Frequency Control Symposium

作者： Jie Miao Jiqing Lian Tianyu Liu Duo Pan Jingbiao Chen Department of Electronics State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Mechano-Electronic Engineering Xidian University Xi’an China State Key Laboratory of Advanced Optical Communication Systems and Networks Lanzhou Institute of Physics Lanzhou China

In this paper we report a new coherent population trapping (CPT) atomic clock based on external cavity laser. Unlike usual CPT atomic clocks, where used the vertical cavity surface emitting laser (VCSEL), we combine the external cavity laser (ECL) with CPT atomic clock to improve the stability. Compared with VCSEL, the ECL has higher laser power of 10 mW and narrower linewidth of 0.8 MHz, meaning that the signal-to-noise ratio of clock can be further improved.

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Up to 320-GBaud Coherent optical system Based on Broadband Segmented TFLN I/Q Modulator

Up to 320-GBaud Coherent Optical System Based on Broadband S...

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Asia communications and Photonics Conference and Exhibition (ACP)

作者： Lingjun Zhou Xiansong Fang Yixiao Zhu Junbo Zhu Yunchen Li Xiaomin Nie Xian Zhou Chuanchuan Yang Lei Wang Weisheng Hu Ke Li Zhixue He Fan Zhang School of Electronic and Computer Engineering Peking University Shenzhen China Pengcheng Laboratory Shenzhen China State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Peking University Beijing China State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China School of Computer & Communication Engineering University of Science and Technology Beijing Beijing China

We demonstrate the record 320-GBd single-polarization QPSK and 300-GBd dual-polarization QPSK signal generation and intradyne coherent detection. This result is achieved with a novel broadband segmented TFLN I/Q modul... 详细信息

ISBN: (数字)9798350379266

ISBN: (纸本)9798350379273

关键词： Partial response signaling Phase shift keying optical recording optical device fabrication Lithium optical fiber communication Encoding Broadband communication optical modulation Photonics

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Intelligent metasurfaces:control,communication and computing

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eLight 2022年第1期2卷 75-98页

作者： Lianlin Li Hanting Zhao Che Liu Long Li Tie Jun Cui State Key Laboratory of Advanced Optical Communication Systems and Networks School of ElectronicsPeking UniversityBeijing 100871China Key Laboratory of High‑Speed Circuit Design and EMC of Ministry of Education School of Electronic EngineeringXidian UniversityXi’an 710071China State Key Laboratory of Millimeter Waves Southeast UniversityNanjing 210096China

Controlling electromagnetic waves and information simultaneously by information metasurfaces is of central importance in modern *** metasurfaces are smart platforms to manipulate the wave-information-matter interactions without manual intervention by synergizing engineered ultrathin structures with active devices and algorithms,which evolve from the passive composite materials for tailoring wave-matter interactions that cannot be achieved in ***,we review the recent progress of intelligent metasurfaces in wave-information-matter controls by providing the historical background and underlying physical *** we explore the application of intelligent metasurfaces in developing novel wireless communication architectures,with particular emphasis on metasurface-modulated backscatter wireless *** also explore the wave-based computing by using the intelligent metasurfaces,focusing on the emerging research direction in intelligent ***,we comment on the challenges and highlight the potential routes for the further developments of the intelligent metasurfaces for controls,communications and computing.

关键词： communication computing intelligent

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Continuous-variable quantum key distribution with on-chip light sources

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Photonics Research 2023年第4期11卷 504-516页

作者： LANG LI TAO WANG XINHANG LI PENG HUANG YUYAO GUO LIANGJUN LU LINJIE ZHOU GUIHUA ZENG State Key Laboratory of Advanced Optical Communication Systems and Networks Center for Quantum Sensing and Information ProcessingDepartment of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai Research Center for Quantum Sciences Shanghai 201315China State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Key Laboratory of Navigation and Location ServicesDepartment of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China SJTU-Pinghu Institute of Intelligent Optoelectronics Pinghu 314200China

Integrated quantum key distribution(QKD)systems based on photonic chips have high scalability and stability,and are promising for further construction of global quantum communications ***-chip quantum light sources are a critical component of a fully integrated QKD system;especially a continuous-variable QKD(CVQKD)system based on coherent detection,which has extremely high requirements for the light ***,for what we believe is the first time,we designed and fabricated two on-chip tunable lasers for CV-QKD,and demonstrated a high-performance system based on these *** of the high output power,fine tunability,and narrow linewidth,the involved on-chip lasers guarantee the accurate shot-noise-limited detection of quantum signals,center wavelength alignment of nonhomologous lasers,and suppression of untrusted excess *** system’s secret key rate can reach 0.75 Mb/s at a 50 km fiber distance,and the secure transmission distance can exceed 100 *** results mark a breakthrough toward building a fully integrated CV-QKD,and pave the way for a reliable and efficient terrestrial quantum-secure metropolitan area network.

关键词： quantum sources distribution

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Beyond 100Gb/s Nyquist 128/256/512-QAM subcarrier modulation direct detection transmission using O-band DML with digital nonlinearity mitigation 26

Beyond 100Gb/s Nyquist 128/256/512-QAM subcarrier modulation...

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26th Optoelectronics and communications Conference, OECC 2021

作者： Zhu, Yixiao Guo, Zidong Wu, Qi Hu, Weisheng State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai200240 China

We experimentally demonstrate high-order QAM SCM signals 20km transmission with O-band DML and digital nonlinearity mitigation. 147Gb/s, 136Gb/s, and 108Gb/s line rates are achieved with 128/256/512-QAM formats below ... 详细信息

ISBN: (纸本)9781557528209

关键词： optical fibers

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Cluster mobile fronthaul over WDM-PON with remote port irrelevance based on cyclic-AWG and coarse filters 26

Cluster mobile fronthaul over WDM-PON with remote port irrel...

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26th Optoelectronics and communications Conference, OECC 2021

作者： Cheng, Ziyu Guo, Zidong Zhu, Yixiao Hu, Weisheng State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai200240 China

A cluster mobile fronthaul over WDM-PON based on cyclic-AWG and coarse filters is presented, which largely decreases the number of ODN interfaces and drop fibers to base stations while maintains remote port irrelevanc... 详细信息

ISBN: (纸本)9781557528209

关键词： optical fibers

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