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International wireless communications and Mobile Computing Conference, IWCMC

作者： Aiqing Zhang Liang Zhou Lei Wang Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications China National Mobile Communications Research Laboratory Southeast University

Device-to-Device (D2D) communication has been proposed to be a promising data offloading solution in the coming big data age, with multimedia dominating the digital contents. As quality of experience (QoE) is the major determining factor in the success of new multimedia applications, we novelly propose a QoE-driven cooperative content dissemination (QeCS) scheme in the paper. Specifically, all the users predict the QoE of the potential connections characterized by mean opinion score (MOS) and send the results to the content provider (CP). Then CP formulates a weighted oriented graph based on the network topology and MOS of each potential connection. By factorizing the graph, the content dissemination fashion is established through seeking 1-factor with the maximum weight thus achieving maximum total user MOS.

关键词： Peer-to-peer computing Receivers Transmitters Yttrium Multimedia communication Mobile communication Graph theory

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Compressive wideband spectrum sensing in CRNS under primary user emulation attack 10

Compressive wideband spectrum sensing in CRNS under primary ...

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10th International Conference on wireless communications, networking and Mobile Computing, WiCOM 2014

作者： Cao, K.T. Shao, H.Q. National Mobile Communications Research Laboratory Southeast University Nanjing China Key Lab of Broadband Wireless Commun. and Sensor Network Technology of the State Education Ministry Nanjing University of Posts and Telecommunications Nanjing China College of Software Beihang University Beijing China

ISBN: (纸本)9781849198455

Spectrum sensing in a wideband regime for cognitive radio network (CRN) faces considerably technical challenge due to the constraints on ADCs, especially in the presence of primary user emulation attack (PUEA) where some malicious users try to impersonate the primary user (PU) to prevent other secondary users (SUs) from accessing the idle spectrum. To address this issue, an eigenvalue-based compressive wideband spectrum sensing (ECWSS) scheme is proposed in this paper. ECWSS directly utilizes the compressive measurements based on compressive sampling (CS) theory to perform wideband spectrum sensing without requiring signal recovery. In ECWSS, the sensors around a SU carry out compressive sampling at the sub- Nyquist rate instead of the SU. Furthermore, the exact probability density function of extreme eigenvalues is used to set the threshold. Theoretical analysis and simulation results show that compared to the traditional sensing scheme, ECWSS has better detection performance and is more robust in the existence of PUEA.

关键词： Compressed sensing

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Secure efficient routing based on network coding in the delay tolerant networks

Secure efficient routing based on network coding in the dela...

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IEEE International Conference on Software Engineering and Service Sciences (ICSESS)

作者： Jianmin Bao Shu Zhang Junjie Zhang Kun Wang Haifeng Hu Key Lab of Broadband Wireless Communication and Sensor Network Technology (Nanjing Univ. of Posts and Telecommunications) Nanjing University of Posts and Telecommunications Nanjing Jiangsu Province China

The Delay/Disruption Tolerant network (DTN) is characterized with long delay, high bit-error rate, intermittent connectivity and frequent partitions. Due to this, network coding is introduced to improve its transmission performance significantly. Numerous DTN routing algorithms based on network coding have been developed. However, they are susceptible to various malicious attacks. In this paper, we propose a new kind of networking scheme suitable to the DTN, which can resist the eavesdropping attacks to a certain extant. Firstly, we establish a DTN network model based on the packet path optimization allocation algorithm and redefine the packet format to meet the algorithm requirements. Meanwhile, to resist the dropping attacks, the source node dynamically adds redundancy factors at the certain time. Then the pollution attacks and the data tampering attacks can almost be resisted by means of mutual authentication between intermediate nodes. This approach avoids the traditional anti-tampering attack algorithm over-reliant on the source node. The security analysis and simulation results show that our scheme can effectively resist the joint attacks and optimize the network performance.

关键词： Routing network coding Delays Mathematical model Encoding Equations Security

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An Improved Outdoor Camera Calibration Method Based On EKF

An Improved Outdoor Camera Calibration Method Based On EKF

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2014 International Conference on Computer,communications and Information technology(CCIT 2014)

作者： Shaopo Zhu Dong Hu Education Ministry's Key Lab of Broadband Wireless Communication and Sensor Network Technology Jiangsu Province's Key Lab of Image Procession and Image Communications Nanjing University of Posts and Telecommunications

ISBN: (纸本)9781629939865

An improved outdoor camera calibration method based on Extended Kalman Filter(EKF) is proposed in this paper. GPS coordinate system is introduced to establish world coordinate system in the calibration procedure. According to the characteristics of GPS coordinate converted to plane coordinate and the camera calibration model, we establish the mapping relations of reference points between image plane coordinate and the world coordinate. Further, we consider the world coordinate error, set the world coordinates as the measure quantities, use the method of EKF to get the optimal estimation of intrinsic and extrinsic camera parameters, in EKF the camera's intrinsic and extrinsic parameters are set as state variables, the transformation equations of image coordinate to the world coordinate are set as the measurement equations, and we let the observed feature points' image coordinates and corresponding world coordinates as the input of the filter. Experimental results confirmed that the proposed method with high precision.

关键词： camera calibration,GPS coordinate,EKF,world coordinate error

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Lorentzian Hard Thresholding Pursuit for Compressed Sensing in the Presence of Impulsive Noise

Lorentzian Hard Thresholding Pursuit for Compressed Sensing ...

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2014 4th IEEE International Conference on Information Science and technology

作者： Ji Yun-yun Yang Zhen College of Communications and Information Engineering Nanjing University of Posts and Telecommunications Key Lab of “Broadband Wireless Communication and Sensor Network Technology” Ministry of Education Nanjing University of Posts and Telecommunications

The Lorentzian hard thresholding pursuit algorithm is proposed in this paper to achieve efficient reconstruction for compressed sensing in the presence of impulsive noise. In the Lorentzian hard thresholding pursuit algorithm, the minimum norm problem is solved with respect to a support which is obtained through the hard thresholding operator. The convergence and reconstruction performance of the Lorentzian hard thresholding pursuit algorithm is proved in theory in this paper. Experimental results show that the reconstruction performance of the Lorentizian hard thresholding pursuit algorithm is superior to the Lorentzian iterative hard thresholding algorithm which is also an effective algorithm for sparse reconstruction of compressed sensing in the impulsive noise environment.

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An improved packet sending algorithm based on LTP in Delay Tolerant networks

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Journal of Computational Information Systems 2014年第12期10卷 5279-5286页

作者： Liu, Yan Wang, Kun Xu, Lili Yu, Yue Ouyang, Zhiyou College of Automation and Electrical Engineering Nanjing University of Technology Nanjing 210009 China Key Lab. of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing 210003 China

In DTN (Delay Tolerant networks), bundle and block shred data to cope with frequent interruption. However, it remains a problem of what impact will be generated on transmission efficiency by the size of bundle and block as well as how to achieve maximum efficiency by adjusting Bundle and block size in terms of environment. This paper focuses on Bundle and LTP (Licklider Transmission Protocol) in transmission layer of DTN and the impact of block size on transmission efficiency. Then a packet sending algorithm is proposed that dynamically varies its strategy to achieve the best transmission efficiency. Finally, simulation results illustrate the advantages of our proposed scheme. Meanwhile, selecting optimum size of block in proposed algorithm can increase the transmission efficiency. 1553-9105/Copyright © 2014 Binary Information Press.

关键词： Delay tolerant networks

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Fast encoding method using CU depth for quality scalable HEVC

Fast encoding method using CU depth for quality scalable HEV...

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IEEE Workshop on Advanced Research and technology in Industry Applications (WARTIA)

作者： Qingyang Ge Dong Hu Education Ministry's Key Lab of Broadband Wireless Communication and Sensor Network Technology Jiangsu Province's Key Lab of Image Procession and Image Communications Nanjing University of Posts and Telecommunications Nanjing CN

In this paper, a new fast encoding scheme using CU depth information for quality scalable HEVC was proposed. The proposed scheme based on the correlation between the base layer and enhancement layer, as well as the correlation between current frame and reference frame, which obtained by experiment. The main idea of the algorithm is that when each LCU is encoded in enhancement layer, it's corresponding encoded LCU's best coding depth in base layer is used as the new maximum encoding depth in enhancement layer, thereby, it can reduce the unnecessary CU division process then reduce the computational complexity. On the other hand, for base layer, when each LCU encoding in current frame, the corresponding LCU's depth in already coded reference frame is utilized to skip parts process of mode selection before reach this reference depth, so that the computational complexity can be reduced again. Experimental results show that compared with the original SHM5.1, our proposed method saves about 59.45% and 67.71% encoding time in whole encoding layers and enhancement layer respectively, with a negligible decrease in PSNR of 0.014 dB and bitrate increase of 0.46% in EL, as well as PSNR of 0.05 dB and bitrate increase of 1.15% in BL averagely.

关键词： Encoding Scalability Computational complexity Correlation PSNR Bit rate

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A new inter prediction mode decision method based on temporal correlation for HEVC encoder

A new inter prediction mode decision method based on tempora...

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IEEE Workshop on Advanced Research and technology in Industry Applications (WARTIA)

作者： Qiuping Xu Dong Hu Education Ministry's Key Lab of Broadband Wireless Communication and Sensor Network Technology Jiangsu Province's Key Lab of Image Procession and Image Communications Nanjing University of Posts and Telecommunications Nanjing CN

To alleviate the encoder computation load in inter-frame coding of the High Efficiency Video Coding (HEVC), a new fast inter-frame prediction mode decision method is proposed by reducing the number of execution of the advanced motion vector prediction (AMVP) mode. Based on the correlation analysis between the corresponding located CU (Coding Unit) in the previous frame and the current CU, we first select the best one inter prediction mode by just performing merge mode decision process and then only perform the AMVP process on the selected one. Experimental results show that the proposed scheme provides 33.04% encoder time savings in Random Access (RA) configuration and 38.05% time savings in Low Delay (LD) configuration on average, and its increment in bit rate is 0.87% in RA and 1.29% in LD compared to the default encoding scheme in HM10.0.

关键词： Encoding Correlation Video coding Vectors Bit rate Algorithm design and analysis Copper

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Spectrum Sensing Via the Best Stochastic Resonance

Spectrum Sensing Via the Best Stochastic Resonance

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2014 International Conference on Electrical and Electronic Engineering(EEE 2014)

作者： Deng-yin ZHANG Hui SUN Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunication Ministry of Education Sci-tech Park of Internet of Things Nanjing University of Posts and Telecommunication

When existing spectrum sensing algorithm detects low SNR signal,detection performance is not *** paper proposes a spectrum sensing algorithm based on the best stochastic *** algorithm introduces the stochastic resonance theory and changes system parameters adaptively through sensing environment *** analysis and simulation results show the algorithm has a good detection performance while sensing low SNR signal.

关键词： Cognitive radio Spectrum sharing Stochastic resonance Primary user signal Bistable system

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Heterogeneous network data acquisition and storage solution in cloud environment

Heterogeneous network data acquisition and storage solution ...

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The 2014 5th International Conference on Environmental Science and Information Application technology(ESIAT 2014)

作者： Chunshao Ren Jiandong Yang Wei Mao Dengyin Zhang Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and TelecommunicationMinistry of Education Sci-tech Park of Internet of Things Nanjing University of Posts and Telecommunication

There exist a number of heterogeneous net units in network in cloud *** problem faced by current network management is how to collect and store data generated by net *** solve this problem,this paper proposes an acquisition and storage solution of huge network management data based on *** the characteristics of heterogeneous network management data and advantages of HBase storage into consideration,an integrated and event-driven solution is made to realize huge network management data acquisition and *** has been proven by practice that by distributed computing of Hadoop and distributed columnar storage of HBase,the solution has secured efficient parallelization of acquisition and storage of the *** performance can be linearly increased when the number of acquisition servers is *** theory,over 13 acquisition servers can run a poll to tens of thousands of net unit device in heterogeneous network within 3 minutes.

关键词： net HBase Heterogeneous network data acquisition and storage solution in cloud environment Hadoop

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