Zhongxing Telecommunication Equipment Corporation

Nanjing, China

Zhongxing Telecommunication Equipment Corporation

Nanjing, China
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Zou T.,Harbin Institute of Technology | Ni F.,Harbin Institute of Technology | Guo C.,Harbin Institute of Technology | Li K.,Zhongxing Telecommunication Equipment Corporation | Liu H.,Harbin Institute of Technology
2016 IEEE International Conference on Robotics and Biomimetics, ROBIO 2016 | Year: 2016

This paper is to introduce a 6-DOF acceleration sensor by utilizing multiple linear accelerometers, which possesses the advantages of small volume, high reliability and easy-to-integrate, etc. A cylindrical spatial geometrical configuration is proposed as the distribution basis of linear accelerometers, which avoids the accumulative errors arising from the integral operation. Moreover, error model of the sensor is deduced and calibrated for further error compensation. Static experiments illustrate that errors of the sensor are compensated effectively. In order to compensate the inertial force and attenuate the bounce of end-effector at the contact transition instant of impedance control, a Kalman filter is adopted to compensated the inertial force of end-effector, which fuses tip position, orientation, acceleration and force/torque. Experimental results indicate the effectiveness of the proposed acceleration sensor, and the inertial force of the end-effector can be compensated effectively in impedance control. © 2016 IEEE.

Wang J.,Jilin University | Du H.,Jilin University | Ming G.,Zhongxing Telecommunication Equipment Corporation | Xinli N.,Jilin University | And 2 more authors.
2017 IEEE International Conference on Imaging, Vision and Pattern Recognition, icIVPR 2017 | Year: 2017

This paper presents an improved locally optimized short-time fractional Fourier transform (STFRFT), HHT-based locally optimized STFRFT, by finding the optimal order using phase information ignoring the premise of the known chirp rate of signal and pre-estimated pitch of speech. The feature derived from the optimal order FRFT's magnitude spectrum, HHT-based locally optimized STFRFT Mel-frequency cepstral coefficients (HLO-STFRFT-MFCC), reveals the definite advantage in speaker recognition experiments on the TIMIT database. Furthermore, HLO-STFRFT-MFCC yields a gain of 13.0% relative to the baseline feature of Mel-frequency cepstral coefficients (MFCC) in the recognition accuracy on 2004 NIST SRE corpora. © 2017 IEEE.

Cao B.,Chongqing University | Sun X.,Chongqing University | Sun X.,China Mobile | Li Y.,Chongqing University | And 2 more authors.
IEEE Transactions on Vehicular Technology | Year: 2017

Cooperative transmission (CT) has been proposed to effectively improve the communication performance like the transmission rate. This is because a relay node (RN) has the advantage of providing more cooperation diversity and a better two-hop cooperation channel than a one-hop direct transmission channel. To this aim, various RN selection algorithms are researched and proposed. Although the benefit of employing RN to wireless networks has been well studied, unfortunately, it introduces some adverse effect at the same time. In this paper, one of these adverse impacts as flow-level cooperation competition (FCC) incurred by RN in CT mode has been investigated. The main problem of FCC is that it may lead to CT mode that is not as beneficial as expected. Considering the pros and cons, an RN in a multiple-hop wireless networks with a game theoretic framework is analyzed, and its performance is investigated. Following this, a Nash equilibrium based strategy is proposed in the process of employing an RN. With this technique, a maximum system performance is achieved, namely, the Nash equilibrium cooperative transmission strategy (NECTS). NECTS guarantees the gain of each flow but also effectively maximizes system performance. Simulation results show that NECTS uses the advantage of cooperative communications but avoids the unnecessary competition. Therefore, the proposed NECTS outperforms the conventional methods. © 2016 IEEE.

Luo B.,Nanjing University of Posts and Telecommunications | Jin Y.,Zhongxing Telecommunication Equipment Corporation | Luo S.,Zhongxing Telecommunication Equipment Corporation | Sun Z.,Nanjing University of Posts and Telecommunications
KSII Transactions on Internet and Information Systems | Year: 2016

To prevent structured peer to peer (P2P) overlay networksfrom being attacked by malicious nodes, a symmetric lookup-based routing algorithm referred to as Symmetric-Chord is proposed in this paper. The proposed algorithm determines the precision of routing lookup by constructing multiple paths to the destination. The selective routing algorithm is used to acquire information on the neighbors of the root. Authenticity of the root is validated via consistency shown between the information ascertained from the neighbors and information from the yet-to-be-verified root, resulting in greater efficiency of resource lookup. Simulation results demonstrate that Symmetric-Chordhas the capability of detecting malicious nodes both accurately and efficiently, so as to identify which root holds the correct key, and provides an effective approach to the routing security for the P2P overlay network. © 2016 KSII.

Xiong G.,National Digital Switching System Engineering Technical Researching Center | Hu Y.,National Digital Switching System Engineering Technical Researching Center | Wang W.,Zhejiang GongShang University | Wang L.,Zhongxing Telecommunication Equipment Corporation
China Communications | Year: 2016

To address the issues that middleboxes as a fundamental part of today's networks are facing, Network Function Virtualization (NFV) has been recently proposed, which in essence asserts to migrate hardware-based middleboxes into software-based virtualized function entities. Due to the demands of virtual services placement in NFV network environment, this paper models the service amount placement problem involving with the resources allocation as a cooperative game and proposes the placement policy by Nash Bargaining Solution (NBS). Specifically, we first introduce the system overview and apply the rigorous cooperative game-theoretic guide to build the mathematical model, which can give consideration to both the responding efficiency of service requirements and the allocation fairness. Then a distributed algorithm corresponding to NBS is designed to achieve predictable network performance for virtual instances placement. Finally, with simulations under various scenarios, the results show that our placement approach can achieve high utilization of network through the analysis of evaluation metrics namely the satisfaction degree and fairness index. With the suitable demand amount of services, the average values of two metrics can reach above 90%. And by tuning the base placement, our solution can enable operators to flexibly balance the tradeoff between satisfaction and fairness of resources sharing in service platforms. © 2013 IEEE.

Yu J.,Wuhan University of Technology | Zhang B.,Zhongxing Telecommunication Equipment Corporation | Chen W.,Wuhan University of Technology | Zhang J.,Changjiang Wuhan Waterway Engineering Company
ICTIS 2015 - 3rd International Conference on Transportation Information and Safety, Proceedings | Year: 2015

As a part of maritime informatization, the whole river basin signal coverage of the radio network is importantly significant to the data transmission between ship and shore. More specifically, on relatively complex Inland River, traditional propagation loss empirical formulas cannot fulfill the demand due to diverse of application environment. Consequently, by focusing on several typical inland river regions' measurement data and analyzing commonly used propagation loss models, the corresponding optimization models are designed. Finally, a comparison analysis is carried out to test these models' effectiveness. Outcomes of the test show that these models can well describe the actual situation of radio signal coverage under the inland river environment. Comparing with traditional empirical models, they are more accurate and practical. © 2015 IEEE.

Wang S.C.,University of Electronic Science and Technology of China | Wang S.C.,Zhongxing Telecommunication Equipment Corporation | Jin J.X.,University of Electronic Science and Technology of China | Wang Y.L.,University of Electronic Science and Technology of China
2015 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD 2015 - Proceedings | Year: 2015

Superconducting magnetic energy storage (SMES) becomes an enabling and emerging technology for power system application. The increasing demand for conventional energy sources and the green house effect are driving societies toward the development of electric vehicles (EVs) and alternate energy sources. This paper aims at investigating the effects of SMES on the smart grid incorporated with EVs. © 2015 IEEE.

Duan H.,University of Electronic Science and Technology of China | Zhan W.,University of Electronic Science and Technology of China | Min G.,University of Exeter | Guo H.,University of Electronic Science and Technology of China | Luo S.,Zhongxing Telecommunication Equipment Corporation
Concurrency Computation | Year: 2015

Summary With the rapid development of intelligent transportation technology, high-definition data storage, and processing of massive amounts of video surveillance have become key issues. When thousands of high-bit-rate video streaming concurrently writes, disk I/O throughput becomes a bottleneck. In addition, this leads to serious energy consumption and disk abrasion. To solve these problems, a new distributed file system for high concurrent and high-bit-rate writing is designed. It combines an optimized data storage model, efficient metadata management, and exquisite disk schedule mechanism. The optimized data storage model uses a file pre-allocation strategy and multiple-stream input modulating technology to convert the randomly concurrent writes on the disk into sequential writes; the metadata management provides an efficient means of retrieving the specified data; and the dual-partition schedule mechanism can ensure the disk stability with less abrasion. Through this distributed file system, the disk I/O throughput can be saturated in a high concurrent writing environment. The performance evaluation results demonstrate that the I/O throughput of a normal 7200RPM SATA III disk in our scheme can be stabilized at 150MB/s, easily to support 300 concurrent high-definition video streams (4Mbit/s each). The distributed file system with eight commodity servers can afford the ability of supporting 8000 high-definition video streams concurrently writing, which is far greater than the existing video surveillance storage solutions. © 2015 John Wiley & Sons, Ltd.

Lu J.,Harbin Engineering University | Li J.-J.,Zhongxing Telecommunication Equipment Corporation | Wang C.-C.,Harbin Engineering University | Xia G.-H.,Harbin Engineering University
Guangdianzi Jiguang/Journal of Optoelectronics Laser | Year: 2015

For complex wrapped phase image, phase usually changes drastically and phase unwrapping computing is very time-consuming. In this paper, a fast and accurate unwrapping algorithm is designed to solve these problems. Firstly, the wrapped phase image is obtained through the three-step phase shift method. The quality map is calculated according to the wrapped phase. Then, the horizontal and vertical weight edges are constructed by using two neighboring pixels' quality value. The phase unwrapping path is guided by weight value of constructed edges. The unwrapping procedure uses two pixels as a unit. All the pixels are unwrapped successively by using a discontinuous path. The proposed algorithm in this paper can reduce the influence of region discontinuities, measurement occlusion and ambient noise on unwrapping accuracy effectively. Only by sorting all edges once, the order of phase unwrapping can be determined. So the efficiency of unwrapping phase is improved significantly. We also make further optimization on the unwrapping algorithm according to the characteristics of constructed weight graph. By this way, the redundant edges are removed. It can rapidly speed up the unwrapping process. Through the comparison of experiment results with other algorithms, it indicates that the proposed algorithm is faster and more accurate. ©, 2015, Board of Optronics Lasers. All right reserved.

Dong F.,National Digital Switching System Engineering Technical Researching Center | Li O.,National Digital Switching System Engineering Technical Researching Center | Ran X.,National Digital Switching System Engineering Technical Researching Center | Jin F.,Zhongxing Telecommunication Equipment Corporation
China Communications | Year: 2016

A dynamic protocol stack (DPS) for ad hoc networks, together with a protocol stack construction scheme that is modeled as a multiconstrained knapsack problem is proposed. Compared to the traditional static protocol stack, DPS operates in a dynamic and adaptive manner and is scalable to network condition changes. In addition, a protocol construction algorithm is proposed to dynamically construct of the protocol stack each network node. Simulation results show that, the processing and forwarding performance of our scheme is close to 1 Gb/s, and the performance of our algorithm is close to that of the classical algorithms with much lower complexity. © 2013 IEEE.

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