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Research Towards Terahertz Power Amplifiers in Silicon-Based Process

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zte communications 2023年第2期21卷 88-94页

作者： CHEN Jixin ZHOU Peigen YU Jiayang LI Zekun LI Huanbo PENG Lin Southeast University Nanjing 211189China zte Corporation Shenzhen 518057China

In view of the existing design challenges for Terahertz(THz)power amplifiers(PAs),the common design methods and the efforts of the State Key Laboratory of Millimeter Wave,Southeast University,China in the development of silicon-based THz PAs,mainly including silicon-based PAs with operating frequencies covering 100–300 GHz,are summarized in this ***,we design an LC-balun-based two-stage differential cascode PA with a center frequency of 150 GHz and an output power of 14 *** on a Marchand balun,we report a 220 GHz three-stage differential cascode PA with a saturated output power of 9.5 *** further increase the output power of THz PA,based on a four-way differential power combining technique,we report a 211–263 GHz dual-LC-tank-based broadband PA with a recorded 14.7 dBm Psat and 16.4 dB peak *** the above circuits are designed in a standard 130 nm silicon germanium(SiGe)BiCMOS process.

关键词： power amplifier power combining SiGe silicon-based Terahertz

Deadlock Detection:Background,Techniques,and Future Improvements

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zte communications 2024年第2期22卷 71-79页

作者： LU Jiachen NIU Zhi CHEN Li DONG Luming SHEN Taoli Zhejiang University Hangzhou 310058China zte Corporation Xi’an 710114China

Deadlock detection is an essential aspect of concurrency control in parallel and distributed systems,as it ensures the efficient utilization of resources and prevents indefinite *** paper presents a comprehensive analysis of the various deadlock detection techniques,including static and dynamic *** discuss the future improvements associated with deadlock detection and provide a comparative evaluation of these techniques in terms of their accuracy,complexity,and ***,we outline potential future research directions to improve deadlock detection mechanisms and enhance system performance.

关键词： deadlock detection static analysis dynamic analysis

Multiple-Constraint-Aware RWA Algorithms Based on a Comprehensive Evaluation Model:Use in Wavelength-Switched Optical Networks

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zte communications 2012年第3期10卷 55-61页

作者： Hui Yang YongliZhao Shanguo Huang Dajiang Wang Xuping Cao Xuefeng Lin State Key Laboratory of Information Photonics and Optical communications Beijing University of Posts and Telecommunications Beijing 100876 China zte Corporation Shenzhen 518057 China

Because of explosive growth in Internet traffic and high complexity of heterogeneous networks, improving the routing and wavelength assignment （RWA） algorithm in underlying optical networks has become very important. Where there are multiple links between different the node pairs, a traditional wavelength-assignment algorithm may be invalid for a wavelength-switched optical networks （WSON） that has directional blocking constraints. Also, impairments in network nodes and subsequent degradation of optical signals may cause modulation failure in the optical network. In this paper, we propose an RWA algorithm based on a novel evaluation model for a WSQN that has multiple constraints. The algorithm includes comprehensive evaluation model （CEM） and directional blocking constraint RWA based on CEM （DB-RWA）. Diverse constraints are abstracted into various constraint conditions in order to better assign routing and wavelength. We propose using the novel CEM to optimize routing according to an assessed value of constraints on transmission performance. This eliminates the effects of physical transmission impairments in a WSON. DB-RWA based on CEM abstracts directional blocking conditions in multiple links between network nodes into directional blocking constraints. It also satisfies rigorous network specifications and provides flexibility, scalability, and first-fit rate for the backbone, especially in multiple links between WSON nodes.

关键词： RWA WSON multiple links between nodes pair directionalblocking constraint comprehensive evaluation model

Construction of Protograph LDPC Codes Based on the Convolution Neural Network

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China communications 2023年第5期20卷 84-92页

作者： Zhiyuan Xiao Liguang Li Jin Xu Jin Sha School of Electronic Science and Engineering Nanjing UniversityNanjing 210023China Institute of Wireless Research ZTE CorporationShenzhen 518055China

This paper presents an intelligent protograph construction *** LDPC codes have shown excellent error correction performance and play an important role in wireless *** search or manual construction are often used to obtain a good protograph,but the efficiency is not high enough and many experience and skills are *** this paper,a fast searching algorithm is proposed using the convolution neural network to predict the iterative decoding thresholds of protograph LDPC codes effectively.A special input data transformation rule is applied to provide stronger generalization *** proposed algorithm converges faster than other *** iterative decoding threshold of the constructed protograph surpasses greedy algorithm and random search by about 0.53 dB and 0.93 dB respectively under 100 times of density *** results show that quasi-cyclic LDPC(QC-LDPC)codes constructed from the proposed algorithm have competitive performance compared to other papers.

关键词： LDPC codes protograph codes iterative decoding threshold neural network

Simulation and Modeling of Common Mode EMI Noise in Planar Transformers

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zte communications 2023年第3期21卷 105-116页

作者： LI Wei JI Jingkang LIU Yuanlong SUN Jiawei LIN Subin zte Corporation Shenzhen 518057China Fuzhou University Fuzhou 350108China

The transformer is the key circuit component of the common-mode noise current when an isolated converter is *** highfrequency characteristics of the transformer have an important influence on the common-mode noise of the ***,the measurement method is used for transformer modeling,and a single lumped device is used to establish the transformer model,which cannot be predicted in the transformer design *** on the transformer common-mode noise transmission mechanism,this paper derives the transformer common-mode equivalent capacitance under ideal *** to the principle of experimental measurement of the network analyzer,the electromagnetic field finite element simulation software three-dimensional(3D)modeling and simulation method is used to obtain the two-port parameters of the transformer,extract the high-frequency parameters of the transformer,and establish its electromagnetic compatibility equivalent circuit ***,an experimental prototype is used to verify the correctness of the model by comparing the experimental measurement results with the simulation prediction results.

关键词： planar transformer electromagnetic compatibility common-mode noise simulation modeling

Learned Distributed Query Optimizer:Architecture and Challenges

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zte communications 2024年第2期22卷 49-54页

作者： GAO Jun HAN Yinjun LIN Yang MIAO Hao XU Mo Peking University Beijing 100871China zte Corporation Shenzhen 518057China

The query processing in distributed database management systems(DBMS)faces more challenges,such as more operators,and more factors in cost models and meta-data,than that in a single-node DMBS,in which query optimization is already an NP-hard *** query optimizers(mainly in the single-node DBMS)receive attention due to its capability to capture data distributions and flexible ways to avoid hard-craft rules in refinement and adaptation to new *** this paper,we focus on extensions of learned query optimizers to distributed ***,we propose one possible but general architecture of the learned query optimizer in the distributed context and highlight differences from the learned optimizer in the single-node *** addition,we discuss the challenges and possible solutions.

关键词： distributed query processing query optimization learned query optimizer

Log Anomaly Detection Through GPT-2 for Large Scale Systems

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zte communications 2023年第3期21卷 70-76页

作者： JI Yuhe HAN Jing ZHAO Yongxin ZHANG Shenglin GONG Zican Nankai University Tianjin 300071China zte Corporation Shenzhen 518057China

As the scale of software systems expands,maintaining their stable operation has become an extraordinary *** logs are semi-structured text generated by the recording function in the source code and have important research significance in software service anomaly *** log anomaly detection methods mainly focus on the statistical characteristics of logs,making it difficult to distinguish the semantic differences between normal and abnormal logs,and performing poorly on real-world industrial log *** this paper,we propose an unsupervised framework for log anomaly detection based on generative pre-training-2(GPT-2).We apply our approach to two industrial *** experimental results on two datasets show that our approach outperforms state-of-the-art approaches for log anomaly detection.

关键词： hybrid beamforming hybrid architecture weighted mean square error manifold optimization dynamic subarrays

Optimization of High-Concurrency Conflict Issues in Execute-Order-Validate Blockchain

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zte communications 2024年第2期22卷 19-29页

作者： MA Qianli ZHANG Shengli WANG Taotao YANG Qing WANG Jigang Shenzhen University Shenzhen 518000China zte Corporation Shenzhen 518057China

With the maturation and advancement of blockchain technology,a novel execute-order-validate(EOV)architecture has been proposed,allowing transactions to be executed in parallel during the execution ***,parallel execution may lead to multi-version concurrency control(MVCC)conflicts during the validation phase,resulting in transaction *** on different causes,we categorize conflicts in the EOV blockchain into two types:within-block conflicts and cross-block conflicts,and propose an optimization solution called FabricMan based on Fabric *** within-block conflicts,a reordering algorithm is designed to improve the transaction success rate and parallel validation is implemented based on the transaction conflict *** also merge transfer transactions to prevent triggering multiple version *** cross-block conflicts,a cache-based version validation mechanism is implemented to detect and terminate invalid transactions in *** comparisons are conducted between FabricMan and two other systems,Fabric and Fabric++.The results show that FabricMan outperforms the other two systems in terms of throughput,transaction abort rate,algorithm execution time,and other experimental metrics.

关键词： blockchain MVCC conflict reordering parallel validation transaction merging

Mobile Internet WebRTC and Related Technologies

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zte communications 2014年第1期12卷 46-51页

作者： Zhenjiang Dong Congbing Li Wei Wang Da Lyu zte Corporation

This paper describes an improved design for WebRTC technolo- gy. With this design, WebRTC communication at client side, server side, and between these two sides is improved. HTML5 WebSocket, media negotiation and synthesis, network address translator （NAT）/firewall traversal, Session Initiation Protocol （SIP） signaling interaction, and P2P communication security are all used in this improved design. This solution solves cross- browser running problem of WebRTC applications, reduces reli- ance on client-side processing capability, and reduces band- width consumption. With this design, WebRTC also become more scalable.

关键词： WebRTC technology application model running across brows-ers extension