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Optimal user scheduling and power control in multi-user cognitive broadcast systems

Science China(Information Sciences) 2012年第6期55卷 1402-1414页

作者： WANG QunHuan 1,2,3,WANG HuiMing 1,2,3 & YIN QinYe 1,3 1 School of Electronic and Information Engineering,Xi'an Jiaotong University,Xi'an 710049,China 2 State key lab for Integrated Services networks,Xidian University,Xi'an 710071,China 3 ministry of education key lab for intelligent networks and network security,Xi'an Jiaotong University,Xi'an 710071,China. School of Electronic and Information Engineering Xi’an Jiaotong University Xi’an China State key lab for Integrated Services networks Xidian University Xi’an China ministry of education key lab for intelligent networks and network security Xi’an Jiaotong University Xi’an China

Cognitive radio systems should not only have the ability to sense and exploit "frequency spectrum holes",but also the ability to sense and utilize "spatial spectrum holes".In this paper,we consider the issue of maximizing the throughput of the cognitive systems by fully utilizing "spatial spectrum holes" brought in by multiple cognitive users,in the scenario where a pair of licensed users and a cognitive broadcast system share multiple spectrum *** exploiting the channel reciprocity under the premise that the licensed system adopts the time-division-duplexing (TDD) mode,we propose a more practical cognitive access scheme that can sense the interference at the licensed user caused by the cognitive transmitter,based on the existing feedback signals from the licensed user to the licensed base *** both interferences from the licensed base station to the cognitive receiver and from the cognitive transmitter to the licensed user into consideration,we investigate the optimal user scheduling and power allocation scheme that can maximize the ergodic sum rate of the cognitive *** show that scheduling the user whose channel gain to interference and noise ratio (CGINR) is the largest for each frequency band is *** also derive the dynamic power allocation scheme meeting the three practical constraints,i.e.,the transmitter's average transmission power constraint,the power amplifier's instantaneous transmission power constraint,and the interference power constraint at the licensed *** result shows that in different coherent time intervals and different frequency bands,the power allocation has a multi-level waterfilling *** analysis shows that the strategy scheduling user with the largest CGINR introduces significant performance improvement compared with the traditional strategy scheduling user with the largest channel gain to noise ratio (CGNR).We also illustrate the impact of power constraints and the number of users on system p

关键词： cognitive radio distributed spatial spectrum holes opportunistic scheduling power allocation

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Dynamic output feedback robust model predictive control based on ellipsoidal estimation error bound for quasi-LPV systems

Dynamic output feedback robust model predictive control base...

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第25届中国控制与决策会议

作者： Xubin Ping Baocang Ding ministry of education key lab For intelligent networks and network security （MOE KLINNS lab） Department of Automation School of Electronic and Information Engineering Xi’an Jiaotong University

ISBN: (纸本)9781467355322

This paper presents a dynamic output feedback robust model predictive control （DOFRMPC） for the quasiLPV （quasi-linear parameter varying） systems with both polytopic uncertainty and bounded disturbance. Our previous studies have shown that the refreshment of the estimation error set （EES） is a key knob for improving the control performance. In our previous work, for calculating the EES, the recursion of polyhedral set is utilized, which also involves the polyhedral outer approximation of the ellipsoid and the outer ellipsoidal approximation of polyhedral set. By applying S-procedure, a new method for refreshing EES is proposed in this paper which directly utilizes the recursion of ellipsoidal EES. A numerical example is given to illustrate the effectiveness of the approach.

关键词： Dynamic output feedback model predictive control quasi-linear parameter varying systems estimation error set

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Efficient DPCA SAR imaging with fast iterative spectrum reconstruction method

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Science China(Information Sciences) 2012年第8期55卷 1838-1851页

作者： FANG Jian1,ZENG JinShan1,XU ZongBen1&ZHAO Yao2 1M inistry of education key lab for intelligent networks and network security Xi'an Jiaotong University,Xi'an 710049,China 2N ational key laboratory of Science and Technology on Microwave Imaging&Institute of Electronics,Chinese Academy of Sciences,Beijing 100049,China ministry of education key lab for intelligent networks and network security Xi’an Jiaotong University Xi’an China National key laboratory of Science and Technology on Microwave Imaging & Institute of Electronics Chinese Academy of Sciences Beijing China

The displaced phase center antenna(DPCA)technique is an effective strategy to achieve wide-swath synthetic aperture radar(SAR)imaging with high azimuth ***,traditionally,it requires strict limitation of the pulse repetition frequency(PRF)to avoid non-uniform ***,any deviation could bring serious ambiguity if the data are directly processed using a matched *** break this limitation,a recently proposed spectrum reconstruction method is capable of recovering the true spectrum from the nonuniform ***,the performance is sensitive to the selection of the *** regularization based imaging may provide a way to overcome this *** existing time-domain method,however,requires a large-scale observation matrix to be built,which brings a high computational *** this paper,we propose a frequency domain method,called the iterative spectrum reconstruction method,through integration of the sparse regularization technique with spectrum analysis of the DPCA *** approximately expressing the observation in the frequency domain,which is realized via a series of decoupled linear operations,the method performs SAR imaging which is then not directly based on the observation matrix,which reduces the computational cost from O(N2)to O(N log N)(where N is the number of range cells),and is therefore more efficient than the time domain *** sparse regularization scheme,realized via a fast thresholding iteration,has been adopted in this method,which brings the robustness of the imaging process to the PRF *** provide a series of simulations and ground based experiments to demonstrate the high efficiency and robustness of the *** simulations show that the new method is almost as fast as the traditional mono-channel algorithm,and works well almost independently of the PRF ***,the suggested method can be accepted as a practical and efficient wide-swath SAR imaging technique.

关键词： displaced phase center antenna sparse regularization iterative thresholding spectrum reconstruction

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Cryptanalysis of PRIMATEs

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Science China(Information Sciences) 2020年第1期63卷 130-139页

作者： Yanbin LI Meiqin WANG Wenqing LIU Wei WANG key laboratory of Cryptologic Technology and Information security Ministry of EducationShandong University Shandong Provincial key laboratory of Computer networks

PRIMATEs is a family of authenticated encryption design submitted to competition for authenticated encryption: security, applicability, and robustness. The three modes of operation in PRIMATEs family are: APE, HANUMAN, GIBBON with security levels: 80, 120 bits. APE is robust despite the nonce misusing. In this study, we revise the algebraic model and find new integral distinguishers for both PRIMATE permutation and its inverse permutation. Moreover, we construct a zero-sum distinguisher for full12-round PRIMATE-80/120 permutation with the 2;/2;complexity, improving over previous work. We also perform an integral attack on 8-round finalization of APE-80/120 with 2;chosen messages. The key recovery process is optimized using the FFT technique presented by Todo and Aoki. Our work is the best attack against APE, demonstrating the practical attack on 8-round finalization of APE-80. The new integral distinguishers apply to create forgeries on 5/6-round finalization of APE and HANUMAN that require2;/2;chosen messages, which is the first forgery attack against APE and HANUMAN.

关键词： PRIMATEs APE HANUMAN integral distinguisher key recovery attack forgery

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On cross-correlation indicators of an S-box

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Frontiers of Computer Science 2011年第4期5卷 448-453页

作者： Sheng GAO Wenping MA Zepeng ZHUO Fenghe WANG key laboratory of Computer network and Information security Ministry of Education Xidian University Xi＇an 710071 China State key laboratory of Integrated Service networks Xidian University Xi＇an 710071 China

Substitution boxes （S-boxes） are often used as the most important nonlinear components in many symmetric encryption algorithms. The cryptographic properties of an S-box directly affect the security of the whole cipher system. Recently, generalized global avalanche characteristics （GGAC） were introduced to measure the correlation between two arbitrary Boolean functions. In this paper, to better evaluate the security of an S-box, we present two cross-correlation indicators for it. In addition, by studying the related properties of the cross-correlation between two balanced Boolean func- tions, we propose the lower bounds on the sum-of-squares indicator related to GGAC for two balanced functions and also for an S-box.

关键词： cryptography Boolean functions substitu-tion boxes balancedness generalized global avalanchecharacteristics cross-correlation

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A wireless secret key generation method based on Chinese remainder theorem in FDD systems

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Science China(Information Sciences) 2012年第7期55卷 1605-1616页

作者： WANG WenJie 1,JIANG HongYan 1 ,XIA XiangGen 2,3 ,MU PengCheng 1 & YIN QinYe 1 1 ministry of education key lab for intelligent networks and network security,Xi’an Jiaotong University,Xi’an 710049,China 2 Electrical and Computer Engineering,University of Delaware,Newark,DE 19716,USA 3 Chonbuk National University,Jeonju,South Korea ministry of education key lab for intelligent networks and network security Xi’an Jiaotong University Xi’an China Electrical and Computer Engineering University of Delaware Newark USA Chonbuk National University Jeonju South Korea

The wireless physical channel parameters are recently used to provide secret ***,the key generation usually suffers from the quantization errors due to the noise,which decreases the key agreement ratio (KAR) between authorized *** existing approaches achieve high KAR by discarding some channel parameters which may lower the key generation efficiency and therefore lower the encryption *** the frequency-division duplex (FDD) systems,the number of reciprocal parameters,such as the multipath angle and delay,is *** how to find a quantization method with high KAR and encryption strength is one of the major problems for secret key generation in FDD *** this paper,a robust quantization scheme based on grouping and shifting is proposed,in which all the available parameters are used for key *** addition,a key mapping method with error correction based on Chinese remainder theorem (CRT) is proposed to further improve the KAR *** demonstrate the effectiveness of the proposed method.

关键词： wireless communication security secret key generation FDD CRT angle and delay estimation

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Cyclic-delay time-reversal space-time block codes for single-carrier transmission with frequency-domain decision-feedback equalization

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Science China(Information Sciences) 2011年第9期54卷 1905-1915页

作者： FENG Ang,YIN QinYe & WANG HuiMing MOE key laboratory for intelligent networks and network security,Xi’an Jiaotong University,Xi’an 710049,China MOE key laboratory for intelligent networks and network security Xi’an Jiaotong University Xi’an China

Transmit diversity is an important multiple-input multiple-output (MIMO) approach to improve the transmission reliability;however,it is usually designed with maximum-likelihood *** this paper,we investigate a simple transceiver structure for single-carrier MIMO systems,in which the cyclic-delay time-reversal space-time block code (CDTR-STBC) is employed at the transmitter,and the frequency-domain decision-feedback equalization (FD-DFE) is used at the *** separate the transmit antennas into two groups,and then,encode the groups by STBC and cyclically delay the data streams within each *** processing can mitigate the impact of error-propagation and reduce the signal-to-noise ratio (SNR) loss when FD-DFE is employed,in which SNR is defined as the ratio of the received signal power over the noise power at each receive *** support our proposal,this paper also provides the performance analysis of *** is shown that the proposed scheme can achieve full diversity and full transmission rate for a MIMO system employing arbitrary ***,it has considerable performance improvement over the existing schemes.

关键词： single-carrier frequency-domain equalization cyclic delay space-time block code diversity order

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Cryptanalysis and Improvement of a Quantum Secret Sharing Protocol between Multiparty and Multiparty with Single Photons and Unitary Transformations

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Chinese Physics Letters 2010年第6期27卷 13-15页

作者： ZHU Zhen-Chao ZHANG Yu-Qing key lab of Computer networks and Information security of ministry of education Xidian University Xi'an 710071 National Computer network Intrusion Protection Center Graduate University Chinese Academy of Sciences Beijing 100049

In a recent paper [Chin. Phys. Lett 25（2008）1187], a quantum secret sharing scheme between multiparty and multiparty was presented. We show that the protocol is not secure because the last member in Alice＇s group can illegally obtain most secret messages without introducing any error. Finally, a possible way to avoid the security flaw is suggested.

关键词： Secretion Cryptanalysis Improvement of a Quantum

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AOD estimation in WSN localization system with synthetic aperture technique

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Science China(Information Sciences) 2012年第10期55卷 2216-2225页

作者： WANG WenJie,YAO BoBin & YIN QinYe MOE key lab for intelligent networks and network security,School of Electronic and Information Engineering,Xi’an Jiaotong University,Xi’an 710049,China MOE key lab for intelligent networks and network security School of Electronic and Information Engineering Xi’an Jiaotong University Xi’an China

Angel of departure(AOD) based distributed localization scheme in wireless sensor networks allows the single antenna sensor node to estimate its own AOD information by an equivalent antenna array for further position ***,the condition that the number of antennas at the multi-antenna agent/anchor node should be larger than the number of multipath signal components(MPCs) constrains its actual *** this paper,we provide a more practical approach to achieve AOD information estimation under multipath *** that the sensor node can not identify the line of sight(LOS) signal component due to the insufficient degree of freedom,which is determined by the above limiting condition,we introduce a synthetic aperture technique with the aid of a fast moving multi-antenna agent/anchor *** operation greatly enlarges the degree of freedom of the equivalent antenna array constructed at sensor node end but without requiring other extra physical antennas equipped at agent/anchor node or sensor node end,which means that it relaxes the limiting ***,the AOD information of LOS signal component can be estimated and extracted successfully in complex multipath *** analysis proves the effectiveness of our proposed synthetic aperture technique and numerical simulations show great performance improvement.

关键词： angle of departure degree of freedom synthetic aperture wireless sensor networks

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Weak generalized self-shrinking generators

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Journal of Systems Engineering and Electronics 2007年第2期18卷 407-411页

作者： Dong Lihua Hu Yupu The key lab. of Computer networks and Information security the Ministry of Education Xidian Univ. Xi'an 710071 P. R. China

The security of certain classes of the generalized self-shrinking sequence （GSS） generators is analyzed. Firstly, it is shown that the security of these GSS generators is equivalent to the security of the GSS generators of the class-1, after which two effective key recovery attacks on the GSS generators of the class-1 are developed to evaluate their security.

关键词： Cryptography Stream cipher, key recovery attacks Generalized self-shrinking sequence.

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