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Conjugate adjoining problem in braid groups and new design of braid-based signatures

Science china(Information Sciences) 2010年第3期53卷 524-536页

作者： WANG LiCheng1,2, WANG LiHua2, CAO ZhenFu3. YANG YiXian1 & NIU XinXin1 Information Security Center, State Key Laboratory of Networking and Switching technology, beijing University of posts and telecommunications, beijing 100876, china 2National institute of Information and Communications technology, Tokyo 184-8795, Japan 3.rusted Digital technology Laboratory, Shanghai Jiao Tong University, Shanghai 200240, china 1. Information Security Center State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China2. National Institute of Information and Communications Technology Tokyo 184-8795 Japan3. Trusted Digital Technology Laboratory Shanghai Jiao Tong University Shanghai 200240 China

The development of quantum computation casts serious threats to the securities of most existing public-key cryptosystems. Braid-based cryptography is one of the alternatives that have potential advantages in resisting quantum attacks. In this paper, the state of the art of braid cryptography is surveyed, and then a new cryptographic problem-conjugate adjoining problem related to braid groups is proposed. Based on this problem, we design a new braid-based signature scheme. This scheme is efficient and provably secure in the random oracle model. Further, we present the comparison between braid-based signatures and rSA-based ones. The signing process of the braid-based schemes is more efficient than that of rSA-based ones, while the verifying process of the braid-based ones is observably slow. Hence, braid-based signatures are suitable for scenarios where the signing process has to be as quick as possible but delays are permitted in the verifying process, for example, in off-line e-cash systems. The key sizes in braid-based schemes are considerably large-about 2K bits in the case of secret keys and 12K bits in the case of public keys. However, braid operations are much simpler and more efficient than modular exponential operations. Therefore, braid-based schemes can be embedded into devices with low computational ability and large memory space. The capability of braid cryptosystems to resist currently known quantum attacks is also discussed from the perspective of hidden subgroup problems.

关键词： braid group conjugate adjoining problem digital signature provable security resistance to quantum attack

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G-MEr： Green Mobility Estimation- Based routing protocol in Wireless Sensor Network

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china Communications 2012年第5期9卷 10-21页

作者： Quan Wei Guan Jianfeng Xu Changqiao Zhang Hongke beijing Univ posts & Telecommun State Key Lab Networking & Switching Technol Beijing 100876 Peoples R China beijing Univ posts & Telecommun Inst Sensing Technol & Business Wuxi 214028 Peoples R China beijing Jiaotong Univ Natl Engn Lab Next Generat Internet Interconnect Beijing 100044 Peoples R China

As a core technology of Intemet of Things （loT）, Wireless Sensor Network （WSN） has become a research hotspot recently. More and more WSNs are being deployed in highly mobile environments. The fast moving sensor nodes bring significant challenges for the routing decision. In this paper, we propose an efficient logical location method, and designe a mobility estimating metric and derive a novel Green Mobility Estirmtion- based routing protocol （G-MEr） for WSNs. We also set up a full framework to evaluate its per- formance. Simulation results illustrate that G-MEr achieves a fairly better perforrmnce in terrm of broadcast times and link failures than AODV. What＇s more, it decreases the mean hops by about 0.25 and reduces energy consumption by about 10% during the whole experiment. All the results show that G-MEr can be effectively used in fast- moving and limited resource scenarios.

关键词： IoT WSN green routing protocol rmbility estimation dynamic window energy con-suming model

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A Simple Capacity Formula for Correlated Diversity rayleigh Fading Channels

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The Journal of china Universities of posts and telecommunications 2004年第z1期11卷 37-39页

作者： CHENG Xing-qing~1, SU Shu-chun~2, LI Dao-ben~1 1.beijing University of posts and telecommunications,beijing 100876, p.r. {3. 2.beijing Electronic Science technology institute,beijing 100070, p.r. {3. beijing University of posts and telecommunications Beijing 100876 P.R. China

The system capacity can be considerably increased if we appropriately exploit the randomness of multipath propagation. A simple average capacity formula is derived for correlated diversity rayleigh fading channels through linear transformation method. Numerical results that illustrate the effect of correlation parameter and diversity order on the diversity capacity are also presented.

关键词： channel capacity fading channel and wireless SIMO systems

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A new navigation approach of terrain contour matching based on 3.D terrain reconstruction from onboard image sequence

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Science china(Technological Sciences) 2010年第5期53卷 1176-1183页

作者： LI LiChun1,2,YU QiFeng2,SHANG Yang2,YUAN Yun2,LU HongWei3.& LIU XiaoLin4 1 beijing Aerospace Control Center,beijing 100094,china 2 College of Aerospace and Material Engineering,National University of Defense {3.,Changsha 410073.china 3.Equipment research institute of pLA’s Second Artillery,beijing 100085,china 4 College of Mechatronic Engineering and Automation,National University of Defense {3.,Changsha 410073.china 1. beijing Aerospace Control Center Beijing 100094 China2. College of Aerospace and Material Engineering National University of Defense Technology Changsha 410073 China3. Equipment Research Institute of PLA’s Second Artillery Beijing 100085 China4. College of Mechatronic Engineering and Automation National University of Defense Technology Changsha 410073 China

This article presents a passive navigation method of terrain contour matching by reconstructing the 3.D terrain from the image sequence(acquired by the onboard camera).To achieve automation and simultaneity of the image sequence processing for navigation,a correspondence registration method based on control points tracking is proposed which tracks the sparse control points through the whole image sequence and uses them as correspondence in the relation geometry ***,a key frame selection method based on the images overlapping ratio and intersecting angles is explored,thereafter the requirement for the camera system configuration is *** proposed method also includes an optimal local homography estimating algorithm according to the control points,which helps correctly predict points to be matched and their speed ***,the real-time 3.D terrain of the trajectory thus reconstructed is matched with the referenced terrain map,and the result of which provides navigating *** digital simulation experiment and the real image based experiment have verified the proposed method.

关键词： terrain contour matching vision-based navigation 3.D reconstruction control points key frame registration optimal local homography

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Location based spectrum sensing performance analysis over fading channels in cognitive radio networks

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The Journal of china Universities of posts and telecommunications 2010年第5期17卷 26-31页

作者： YAO Hai-peng,ZHOU Zheng,SUN Xuan,LI Bin School of Information and Communication Engineering,beijing University of posts and telecommunications,beijing 100876,{3. [a] School of Information Communication Engineering Beijing University of Posts telecommunications Beijing 100876 China

This paper analyzes the spectrum sensing performance over fading channel,in which a licensee and multiple unlicensed users coexist and operate in the licensed channel in a local *** overall average probabilities of detection and false alarm by jointly taking the fading and the locations of all secondary users into account are derived,and a statistical model of cumulate interference is *** on the cumulate interference,a closed-form expression of outage probability at the primary user’s receiver according to a specific distribution of the fading is ***,the sensing parameters so as to minimize the total spectrum sensing error and maximize the average opportunistic throughput are *** is noted that the overall average performance analysis and results here enable to benchmark the design of specific spectrum sensing algorithms.

关键词： spectrum sensing cognitive radio cumulate interference outage probability

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Digital Cancellation Scheme and Hardware Implementation for High-Order passive Intermodulation Interference Based on Hammerstein Model

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china Communications 2019年第9期16卷 165-176页

作者： Xiaqing Miao Lu Tian School of Information and Electronics Beijing Institute of TechnologyBeijing 100081China china Academy of Electronics and Information technology Beijing 100041China

passive intermodulation(pIM)interference urgently needs to be solved in the satellite communication system,owing to degrading the whole *** research contributions to the cancellation method for pIM were focused on the analog domain,however,the pIM distortion cannot be eliminated completely with the ***,some researchers attempt to tackle the problem through digital signal processing,nevertheless,the proposed methods were not suitable for the practical satellite communication *** this paper,we present a general scheme for the adaptive feedforward pIM ***-order pIM signals at baseband are estimated by modeling the pIM distortion with Hammerstein model in the digital *** on the reconstructed pIM signal,we adopt the least mean square algorithm to adaptively mitigate the pIM interference for tracking the variation of *** time and frequency synchronization of pIM are based on the correlation of the peak of received signals with the corresponding reconstructed pIM *** experimental results show that the scheme can effectively cancel the pIM interference,and achieve an interference suppression gain more than 20dB.

关键词： satellite communication passiveintermodulation interference digital cancellation Hammerstein model

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research on the passivation Function of Si＿3.＿4 Film to YBCO Superconducting Film

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The Journal of china Universities of posts and telecommunications 1995年第1期2卷 59-62页

作者： Zhang Yutian Jin Bo AND Qian pingkai(Department of Applied Science and technology, beijing University of posts and telecommunications beijing 100088, p. r. china)Yang Bingchuan Wang Xiaoping (beijing General research institute for Non-ferrous Metals Beiji

We made the high critical temperature superconducting film YBa_2Cu_3._(7-8). (YBCO) with wonderful prop-erties by magnetic sputtering, and deposited Si_3._4 protected covering on YBCO by microwave plasma Chemical Va-par Deposition (CVD) method and completed a moisture test to study this structure. The analysis of X-ray diffract-ing energy spectral of this structure had been made. The results showed that the Si_3._4 film made no obviously influ-ence on YBCO and the Si_3._4 film had better passivation to water obviously.

关键词： superconducting films passivation moisture experiment

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principle and Key Technologies of OFDM-roF

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ZTE Communications 2009年第3期7卷 36-40页

作者： Li Weilin,Zhang Jie,Gu Wanyi(institute of Optical Communication and Optoelectronics,beijing University of posts and telecommunications,beijing 100876,p.r.china)

The merging of optical communication and wireless communication is a tendency in the development of future *** Frequency Division Multiplexing (OFDM) technology is becoming a core technology in the physical layer of next generation wireless communication *** advantages of both wireless communication and optical communication,OFDM radio over Fiber (OFDM-roF) system is characterized by high speed,large capacity and high spectral ***,it still has some problems to be addressed,including dispersion and nonlinearity *** nonlinearity effect of fiber and modulator can be mitigated by pApr reduction algorithms,the dispersion effect can be eliminated using Cyclic prefix (Cp) and channel estimation,and the fiber nonlinearity can be reduced by techniques such as digital phase conjugation,partial Carrier Filling (pCF),nonlinearity precompensation and serial correlation reduction.

关键词： OFDM principle and Key Technologies of OFDM-roF

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Impurity in pairwise Entanglement of Heisenberg XX Open Chain

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Communications in Theoretical physics 2007年第12期 1009-1016页

作者： XI Xiao-Qiang~(1,2)CHEN Wen-Xue~1 LIU Qi~3.and YUE rui-Hong~3.1 Department of Applied Mathematics and physics,Xi’an institute of posts and telecommunications,Xi’an 710061,china~2 Joint Laboratory of Advanced {3. in Measurements,beijing National Laboratory for Condensed Matter physics,institute of physics,the Chinese Academy of Sciences,beijing 100080,china~3.institute of Modern physics,North-West University,Xi’an 710069,china Department of Applied Mathematics and physics Xi'an Institute of Posts and Telecommunications Xi'an 710061 China Joint Laboratory of Advanced technology in Measurements Beijing National Laboratory for Condensed Matter Physics Institute of Physics the Chinese Academy of Sciences Beijing 100080 China Department of Applied Mathematics and physics Xi'an Institute of Posts and Telecommunications Xi'an 710061 China institute of Modern physics North-West University Xi'an 710069 China

We calculate the concurrence of all pairwise entanglement of Heisenberg XX open chain with single systemimpurity in three-qubit and four-qubit cases,and find that the impurity parameter J_i has great effect on *** the proper parameter J_i,we can obtain the maximal pairwise entanglement of the nearestqubits and make the non-nearest qubits entangle.

关键词： system impurity pairwise entanglement Heisenberg XX chain

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Cognition Based reconfigurable Wireless Network technology

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ZTE Communications 2009年第2期7卷 1-5页

作者： Feng Zhiyong, Su Meiyu, Zhang Qixun (Wireless technology Innovation institute of beijing University of posts and {3. , beijing 100876 , p . r . china )

The End-to-End reconfigurability (E2r) project aims at realizing the convergence of the heterogeneous radio networks and the optimal utilization of the radio resources. With the continuous development of E2r technology and cognitive theory, the evolution from existing radio networks to future reconfigurable radio networks with the cognitive ability becomes possible. Nowadays the research aspects of E2r include the system architecture of reconfigurable radio networks and some key technologies for their evolution.

关键词： real Cognition Based reconfigurable Wireless Network technology

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