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Robust multiuser MIMO scheduling algorithms with imperfect CSI

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Science China(Information Sciences) 2012年第4期55卷 815-826页

作者： MAO JunLing 1,3,GAO JinChun 1,3,liu YuanAn 1,3,XIE gang 2,3 & ZHANG Jian 1,3 1 school of electronic engineering,beijing university of posts and telecommunications,beijing 100876,China 2 school of Information and Communication engineering,beijing university of posts and telecommunications,beijing 100876,China 3 Key Lab of Universal Wireless Communications,Ministry of Education,beijing university of posts and telecommunications,beijing 100876,China school of electronic engineering Beijing University of Posts and Telecommunications Beijing China Key Lab of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing China school of Information and Communication engineering Beijing University of Posts and Telecommunications Beijing China

Robust multiuser multiple-input-multiple-output (MIMO) scheduling algorithms are proposed in this *** imperfect channel state information (CSI),traditional scheduling algorithms for the multiuser MIMO system based on the zero forcing precoding scheme will lose some performance due to the multi-user interference (MUI).In order to improve the system average throughput,we study the robust multiuser MIMO scheduling problem with imperfect *** the average capacity formula,we derive a robust factor which can transform the robust multiuser MIMO scheduling problem into the traditional one,thus most existing non-robust scheduling algorithms can be robust if this factor is *** results show that compared with the traditional algorithms,the proposed robust algorithms can improve the system average throughput significantly under the CSI error environment.

关键词： multiuser MIMO (MU-MIMO) scheduling robust imperfect CSI

User-perceived e-mail service QoS parameters and measurement

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The Journal of China Universities of posts and telecommunications 2010年第3期17卷 85-90页

作者： LI Yong-zhi , liu Feng, LEI Zhen-ming, CHEN Ling school of Information and Communication engineering, beijing university of posts and telecommunications, beijing 100876, China school of Information and Communication engineering Beijing University of Posts and Telecommunications Beijing 100876 China

A group of quality of service （QoS） parameters of electronic mail （e-mail） traffic are proposed from users＇ perspective. These parameters cover three fields： delay, throughput and usability. Concept and algorithm of each parameter are presented and its effect on user perceptions is described. In order to evaluate the effectiveness of these parameters, an active measurement system is implemented. Measured results show that the group of QoS parameters we proposed can be used to get a comprehensive view of user-perceived e-mail service QoS.

关键词： user perceptions e-mail service QoS active measurement

Error exponents for two-hop Gaussian multiple source-destination relay channels

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Science China(Information Sciences) 2012年第2期55卷 348-359页

作者： DENG PanLiang1,3,liu YuanAn1,3,XIE gang2,3,WANG XiaoYu1,3,TANG BiHua1,3 & SUN JianFeng1,3 1school of electronic engineering,beijing university of posts and telecommunications,beijing 100876,China 2school of Information and Communication engineering,beijing university of posts and telecommunications,beijing 100876,China 3Key Laboratory of Universal Wireless Communication,Ministry of Education,beijing 100876,China school of electronic engineering Beijing University of Posts and Telecommunications Beijing China Key Laboratory of Universal Wireless Communication Ministry of Education Beijing China school of Information and Communication engineering Beijing University of Posts and Telecommunications Beijing China

We investigate the two-hop multiple source-destination relay channels using the rate splitting trans-mission scheme where each source can split its message into private and public *** determine the system error probability via integrated exponent function under amplify-and-forward(AF)and decode-and-forward(DF)relay *** most significant difference between AF and DF system error probability evaluations lies in a minimized cut-set bound of transmission rate under the DF *** are many cases among transmission rate intervals for different system parameters(*** power)and it is extremely complex to derive the system error probability for the DF *** obtain a relatively simple result,which unifies various cases by a few *** results show that the system error probability decreases with the increase of the public ***,in order to draw deep insight into the reliability requirement of each source node in this network,we provide the error exponent region(EER)for different source nodes to show the trade-off of error probability among source nodes.

关键词： error exponent error exponent region rate splitting multiple source-destination relay channel

Flexibility potential of Cs_(2)BX_(6)(B=Hf,Sn,Pt,Zr,Ti;X=I,Br,Cl)with application in photovoltaic devices and radiation detectors

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Journal of Energy Chemistry 2024年第8期95卷 271-287,I0006页

作者： Songya Wang Changcheng Chen Shaohang Shi Ziyi Zhang Yan Cai Shuli Gao Wen Chen Shuangna Guo Elyas Abduryim Chao Dong Xiaoning Guan Ying liu gang liu Pengfei Lu school of Science Xi’an University of Architecture and TechnologyXi’an 710055ShaanxiChina Key Laboratory of Eco Planning&Green Building Ministry of EducationTsinghua UniversityBeijing 100080China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876China school of Physics and Optoelectronic engineering Ludong UniversityYantai 264025ShandongChina

As interest in double perovskites is growing,especially in applications like photovoltaic devices,understanding their mechanical properties is vital for device *** extensive exploration of structure and optical properties,research on mechanical aspects is *** article builds a vacancyordered double perovskite model,employing first-principles calculations to analyze mechanical,bonding,electronic,and optical *** show Cs_(2)Hfl_(6),Cs_(2)SnBr_(6),Cs_(2)SnI_(6),and Cs_(2)PtBr_(6)have Young's moduli below 13 GPa,indicating *** parameters explain flexibility variations with the changes of B and X site *** characteristic exploration reveals the influence of B and X site electronegativity on mechanical ***_(2)SnBr_(6)and Cs_(2)PtBr_(6)are suitable for solar cells,while Cs_(2)HfI_(6)and Cs_(2)TiCl_(6)show potential for semi-transparent solar *** property calculations highlight the high light absorption coefficients of up to 3.5×10^(5) cm^(-1)for Cs_(2)HfI_(6)and Cs_(2)TiCl_(6).Solar cell simulation shows Cs_(2)PtBr_(6)achieves 22.4%of conversion ***_(2)ZrCl_(6)holds promise for ionizing radiation detection with its 3.68 eV bandgap and high absorption ***-ordered double perovskites offer superior flexibility,providing valuable insights for designing stable and flexible *** understanding enhances the development of functional devices based on these perovskites,especially for applications requiring high stability and flexibility.

关键词： Double perovskite Mechanical properties Flexible Photovoltaic Radiation detectors

Design and Realization of A Cryptographic and Certificate Authority Center for User in VoIP System

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Design and Realization of A Cryptographic and Certificate Au...

2006北京地区高校研究生学术交流会

作者： LIAO Wei liu gang HOU Bin ZHANG Ru (school of Sciences, beijing university of posts and telecommunications, beijing 100876, China) (school of electronic engineering, beijing university of posts and telecommunications, beijing 100876, China)

To authenticate the identity and distribute the private keys of users based on the stream media cryptographic system, a new scheme is proposed by integrating the idea of traditional PKI into IBE system, Certificate Authority and the concept of public-key certificate are used in the new scheme to set up the secure channel for transmitting the private key. The private key distribution problem is addressed in the new scheme, and the secure performance of the system is improved. At the same time, the number of authentications needed, the calculating amounts and communicative expenses of the system are greatly reduced.

关键词： certificate authority identity-based encryption stream media private key distribution

A STUDY OF MOBILE VALUE-ADDED SERVICE BASED ON P2P

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A STUDY OF MOBILE VALUE-ADDED SERVICE BASED ON P2P

2009 IEEE International Conference on Communication Technology and Applications（ICCTA2009）

作者： Chunxiao Fan Jie liu Xiaoying Zhang Changlu Gong school of electronic engineering beijing university of posts and telecommunications beijing 100876 China

＜正＞A project of mobile value-added service based on P2P is *** this project,wireless devices can build a P2P network dynamically and they can access and transmit information point to *** idea will adapt to the 3G wireless network and it will become a effective solution for mobile value-added services on *** JXTA and J2ME,a platform based the project is *** module of mobile network based P2P is proved feasible.

关键词： Mobile Communications mobile value added service P2P JXTA

Cocktail effect of ionic patch driven by triboelectric nanogenerator for diabetic wound healing

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Chinese Chemical Letters 2024年第8期35卷 460-465页

作者： Yixia Zhang Caili Xue Yunpeng Zhang Qi Zhang Kai Zhang Yulin liu Zhaohui Shan Wu Qiu gang Chen Na Li Hulin Zhang Jiang Zhao Da-Peng Yang College of Biomedical engineering Taiyuan University of TechnologyTaiyuan 030024China College of electronic Information and Optical engineering Taiyuan University of TechnologyTaiyuan 030024China Shanxi-Zheda Institute of Advanced Materials and Chemical engineering Taiyuan 030024China College of Integrated Circuit Science and engineering Nanjing University of Posts and TelecommunicationsNanjing 210023China school of Rehabilitation Science and engineering University of Health and Rehabilitation SciencesQingdao 266024China school of Materials and Chemical engineering Quanzhou Normal UniversityQuanzhou 362000China

There is increasing evidence shows that either electrical stimulation(ES)or metal ion is an effective way to accelerate ulcerative wound ***,less attention is paid to investigating the synergistic effect between ***,we explore the combined effects of ES and multiple metal ions on dia-betic wound healing assisted by a triboelectric nanogenerator(TENG).Firstly,the novel Eggshell@CuFe_(2)O_(4)nanocomposites(NCs)are prepared,which show unique structure and intrinsic antimicrobial ***,the as-prepared nanocomposites are embedded in oxidized starch hydrogel to form a mul-tifunctional composite gel,which is further assembled into a wearable ionic triboelectric nanogenerator(iTENG)patch with polydimethylsiloxane(PDMS).It can convert the mechanical energy produced by a human body motion to electric energy and mediate the sequential release of metal ions(Fe^(2+)/Ca^(2+)/Cu^(2+)),thereby resulting in the“cocktail effect”on impaired *** their effects,a satisfying healing re-sult in diabetic mouse is identified,which can effectively accelerate wound healing process by relieving inflammation,promoting angiogenesis and collagen *** work puts forward the cocktail effect of electric simulation coupled with the multiple metal ions,and opens up a new perspective in designing iTENG patch towards repair of hard-to-heal wounds.

关键词： iTENG Cocktail effect CuFe_(2)O_(4) Eggshell Diabetic wound

Candidate Expansion Algorithm Based on WeightedSyllable Confusion Matrix for Mandarin LVCSR

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China Communications 2013年第7期10卷 104-112页

作者：常凤香李宝祥刘刚郭军 school of Information and Communication engineering Beijing University of Posts and Telecommunications

The inclusion of more potentially correct words in the candidate sets is important to improve the accuracy of Large Vocabulary Continuous Speech Recognition （LVCSR）. A candidate expansion algorithm based on the Weighted Syllable Confusion Matrix （WSCM） is proposed. First, WSCM is derived from a confusion network. Then, the reeognised candidates in the confusion network is used to conjeeture the most likely correct words based on WSCM, after which, the conjectured words are combined with the recognised candidates to produce an expanded candidate set. Finally, a combined model having mutual information and a trigram language model is used to rerank the candidates. The experiments on Mandarin film data show that an improvement of 9.57% in the character correction rate is obtained over the initial recognition performance on those light erroneous utterances.

关键词： speech recognition candidate expansion confusion matrix

Ultra-High-Speed WLAN Resource Allocation Based on Cloud Decision Algorithm

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Ultra-High-Speed WLAN Resource Allocation Based on Cloud Dec...

教育部中南地区高等学校电子电气基础课教学研究会第二十届学术年会

作者： Zu Yunxiao~1,Zhou Jie~1,Zeng Changchang~1,Wang Yuting~1,Song Yutian~2,liu Xiao~2 (1.school of electronic engineering,beijing university of posts and telecommunications,beijing,China, 100876.2.International school,beijing university of posts and telecommunications,beijing,China, 100876)

The cloud decision algorithm(CDA) for ultra-high-speed WLAN resource allocation is proposed. CDA is a combination of cloud computing system with parallel genetic *** are conducted to compare CDA with dynamic programming algorithm and simple genetic algorithm under cloud computing *** results show that the performance of CDA is better than that of the dynamic programming algorithm and the simple genetic *** transmission rate is increased markedly,the iteration number and computing time is declined *** can meet the real-time requirement of resource allocation in ultra-high-speed WLAN *** transmission rate of CDA with different nodes is also compared by *** results show that the transmission rate is the biggest with moderate nodes,and the transmission rate will be decreased with too many or too few nodes.

关键词： ultra-high-speed WLAN cloud decision algorithm cloud computing parallel genetic algorithms resource allocation