Institute of Chinese Electronic Equipment System Engineering Corporation

Beijing, China

Institute of Chinese Electronic Equipment System Engineering Corporation

Beijing, China
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Wang C.,Institute of Chinese Electronic Equipment System Engineering Corporation | Guo C.,Institute of Chinese Electronic Equipment System Engineering Corporation | Liu D.,Institute of Chinese Electronic Equipment System Engineering Corporation | Li A.,College of Logistics | Wang H.,National University of Defense Technology
Guofang Keji Daxue Xuebao/Journal of National University of Defense Technology | Year: 2014

In order to solve the problems of unified identity management in large organizations' information systems, a new identity management alliance for large organizations is proposed. Through consulting the Liberty Framework raised by the Liberty Alliance Organization, as well as reforming its structure and its pattern of building trust relationships among IDPs, the new identity management alliance is more suitable than the Liberty Framework for large organizations, which are distributed, autonomous, globally unified, and coordinated. In terms of physical structure, the new identity management alliance can be regarded as a tree consisting of multiple IDP nodes while each node must and can only develop trust relationships with its father node and child nodes. This is totally in line with the tree-like hierarchy of every large organization in the real world. In the system realization, based on the tree-like structure of the new identity management alliance, a hierarchical storage of the authentication data is achieved by adopting LDAP. In addition, the user access control was conducted by a security authentication gateway at the network layer, which consequently makes it possible to support B/S and C/S application systems at the same time.


Li Y.,Xidian University | Tian B.,Xidian University | Yi K.,Xidian University | Yu Q.,Xidian University | Yu Q.,Institute of Chinese Electronic Equipment System Engineering Corporation
IEEE Communications Letters | Year: 2017

In this letter, a robust hybrid carrier frequency offset (CFO) estimation scheme based on training symbols is devised for universal-filtered multi-carrier (UFMC) based systems. In this scheme, the CFO estimator based on a least square (LS) criterion is first derived to acquire a coarse frequency offset estimation with the use of a large frequency searching step. And then, the residual frequency offset is accurately estimated through the auto-correlation operation of received signals, which have been compensated. This algorithm has the features of larger estimation range as well as higher estimation precision. Through numerical simulations, it is validated that the performance of the proposed algorithm is better than that of existing algorithms. © 1997-2012 IEEE.


Xu S.-Q.,No.75779 Troop | Luo Q.-Y.,Institute of Chinese Electronic Equipment System Engineering Corporation | Liang S.,Institute of Chinese Electronic Equipment System Engineering Corporation
Xitong Fangzhen Xuebao / Journal of System Simulation | Year: 2010

Interval time series data exists widely, but no related research is focused on this type of data in time series value prediction approaches. The SVM algorithm was used, based on the interval time series regression algorithm and the interval phase space reconstruction, the Support vector Interval Prediction (SVIP) approach of time series was established. The good performance of proposed approach was verified by two simulations, and the results of SVIP were compared with that of Elman NN, and then the advantage of SVIP was made out by the analysis.


Yu Q.,National University of Defense Technology | Jiang C.,Institute of Chinese Electronic Equipment System Engineering Corporation | Wang J.,Institute of Chinese Electronic Equipment System Engineering Corporation
Proceedings - 2013 5th Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2013 | Year: 2013

Ontology evaluation is a key challenge in the field of ontology development and reuse. Current methods of evaluation sometimes can not cover the users' requirements because they are based on isolated ontology. This paper proposes that the evaluation can be based on the relations among domain-specific ontology, defines an ontology co-relation network with mapping relations, and introduces a Page Rank-like method to obtain the rank of ontology. Following we validate our method by experiment on a real ontology dataset, and finally indicate the signification of score in our method. © 2013 IEEE.


Li Y.-H.,Xidian University | Tian B.,Xidian University | Yi K.-C.,Xidian University | Yu Q.,Xidian University | And 2 more authors.
Xi Tong Gong Cheng Yu Dian Zi Ji Shu/Systems Engineering and Electronics | Year: 2016

For carrier synchronization in the case of symbol rate sampling and low signal to noise ratios (SNRs), a novel hybrid carrier tracking loop is proposed, and an intuitive method of determining loop parameters is also investigated. The carrier synchronous loop improves the estimated accuracy of the carrier frequency offset and the phase offset in low SNR environments through modifying the original symbol hard decision method and adding sampling rate conversion blocks which enable the digital frequency-locked loop (FLL) and digital phase-locked loop (PLL) to operate under the condition of different rate sampling. The parameter determination method selects optimal parameters in the z-domain directly according to the stability and unit step response characteristics of the closed-loop systems. Simulation results confirm the feasibility of this algorithm in terms of determining the parameters and indicate that the proposed carrier tracking loop achieves better synchronization performance at relatively low SNRs. © 2016, Chinese Institute of Electronics. All right reserved.


Li Y.,Xidian University | Tian B.,Xidian University | Yi K.-C.,Xidian University | Yu Q.,Xidian University | Yu Q.,Institute of Chinese Electronic Equipment System Engineering Corporation
IEEE Wireless Communications Letters | Year: 2016

In this letter, an efficient parameter design guideline is proposed for closed-loop synchronization architectures. Firstly, the feasible ranges of loop parameters are directly provided in the z-domain according to the closed-loop stability. Secondly, depending upon unit step response characteristics of synchronization loops, accurate parameters are ascertained by minimizing the variance of the thermal noise induced phase error conditionally. Compared with available methods, this method not only has the features of better intuition, but also does not need repeated trial and adjustment operations. Simulation results are presented to corroborate the effectiveness and feasibility of the proposed design guideline. © 2012 IEEE.


Li Y.,Xidian University | Tian B.,Xidian University | Yi K.-C.,Xidian University | Yu Q.,Xidian University | Yu Q.,Institute of Chinese Electronic Equipment System Engineering Corporation
IEICE Transactions on Communications | Year: 2016

In modern communication systems, it is a critical and challenging issue for existing carrier tracking techniques to achieve nearideal carrier synchronization without the help of pilot signals in the case of symbol rate sampling and low signal-To-noise ratio (SNR). To overcome this issue, this paper proposes an effective carrier frequency and phase offset tracking scheme which has a robust confluent synchronization architecture whose main components are a digital frequency-locked loop (FLL), a digital phase-locked loop (PLL), a modified symbol hard decision block and some sampling rate conversion blocks. As received signals are sampled at symbol baud rate, this carrier tracking scheme is still able to obtain precise estimated values of carrier synchronization parameters under the condition of very low SNRs. The performance of the proposed carrier synchronization scheme is also evaluated by usingMonte-Carlo method. Simulation results confirm the feasibility of this carrier tracking scheme and demonstrate that it ensures that both the rate-3/4 irregular low-density parity-code (LDPC) coded system and the military voice transmission system utilizing the direct sequence spread spectrum (DSSS) technique achieve satisfactory bit-error rate (BER) performance at correspondingly low SNRs. Copyright © 2016 The Institute of Electronics, Information and Communication Engineers.


Li Y.,Xidian University | Tian B.,Xidian University | Yi K.,Xidian University | Yu Q.,Xidian University | Yu Q.,Institute of Chinese Electronic Equipment System Engineering Corporation
Digital Signal Processing: A Review Journal | Year: 2016

In digital communication systems, typical methodologies in determining loop parameters of the digital phase-locked loop (DPLL) are based on the mapping transformation from the analog domain to the digital domain. However, such transform based algorithms are relatively complicated and not straightforward, and they also cause the problem that loop parameters are affected by the pre-detection integration time greatly. To solve these issues, an effective direct method of determining loop parameters of the second-order DPLL in the z-domain is proposed in this paper. Through ascertaining specific positions of the closed-loop system function's poles inside the right-hand side of the z-plane's unit circle, unknown parameters are calculated directly and flexibly in this method, which enables the DPLL to acquire good low-pass filtering characteristic and system stability. This novel method not only reduces the complexity of solving the parameters, but also eliminates the effect of the pre-detection integration time on loop parameters. Simulation results are provided to confirm the feasibility of the proposed method and to show that the DPLL obtained by this method achieves the similar tracking performance to the discretized PLL. © 2016 Elsevier Inc. All rights reserved.


Xu Y.,PLA Military Transportation University | Cao J.,PLA Military Transportation University | Jia P.,PLA Military Transportation University | Jia P.,Institute of Chinese Electronic Equipment System Engineering Company | Zhang Z.,PLA Military Transportation University
Proceedings - 2012 IEEE 2nd International Conference on Cloud Computing and Intelligence Systems, IEEE CCIS 2012 | Year: 2012

In order to obtain obstacle information in the cross-county environment for an unmanned ground vehicle (UGV), AK-means clustering algorithm is applied in four-layer laser radar data mining in this paper. The result of clustering serves as candidate obstacles. To overcome the false clustering due to vibration of UGV, weighted Euclidean distance is used to improve Davies-Bouldin Index (DBI). The experimental results show that the proposed obstacle detection algorithm is reliable and robust in low speed driving. © 2012 IEEE.


Zhao J.,PLA Military Transportation University | Jia P.,PLA Military Transportation University | Jia P.,Institute of Chinese Electronic Equipment System Engineering Company | Fu S.,PLA Military Transportation University
Proceedings - 2012 IEEE 2nd International Conference on Cloud Computing and Intelligence Systems, IEEE CCIS 2012 | Year: 2012

In the research domain of intelligent driving technology, modeling of the dynamic and uncertain environment is very important for path planning. The accuracy and computational efficiency of path planning depend on environment modeling to a great extent. Inspired by selective attention mechanism of human, this paper proposes multi-scale grid method to model the road environment of intelligent vehicle. The road environment is divided into multi-scale grids. The grids representing the regions close to the vehicle are of large size. The grids representing the regions far away from the vehicle are of small size. The multi-scale gird function is presented to calculate the size of grid. Experimental results show that the proposed algorithm provides an efficient solution to the conflict between computational complexity and modeling accuracy. © 2012 IEEE.

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