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2015 4th National Conference on Electrical,Electronics and Computer Engineering(NCEECE 2015)

作者： Shu Jun Hu Dong Education Ministry’s Key Lab of Broadband Wireless Communication and Sensor Network Technology Education Ministry’s Engineering Research Center of Ubiquitous Network and Health Service System Jiangsu Province’s Key Lab of Image Procession and Image Communications Nanjing University of Post and Telecommunications

ISBN: (纸本)9781510819085

In this paper, we propose a parallel HEVC encoder scheme based on multi-core platform, which provides maximized parallel scalability by exploiting two-level parallelism, namely, the frame level parallelism and the CTB level parallelism. Inspired by the intra-CTB row level parallelism of WPP in HEVC, we investigate the inter-frame CTB prediction dependency to its reference CTBs, and find the inter-CTB correlation. Using this inter-correlation, we divide a frame into CTB units and create CTB-row level coding threads when their corresponding reference CTBs are available. Each thread is bonded to a processing core, therefore, both intra- and inter-CTB rows can be encoded in parallel. Moreover, we introduce a priority scheduling mechanism to control the coding threads. Experiments on Tilera-Gx36 multi-core platform show that, compared with serial execution, the proposed method achieves 3.6 and 4.3 times speedup for 1080 P and 720 P video sequences, respectively.

关键词： HEVC multi-core platform parallel processing frame-level CTB-level

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Interference alignment scheme for downlink multi-carrier MIMO cellular systems

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Journal of Computational Information Systems 2014年第3期10卷 1053-1064页

作者： Yang, Jie Song, Rongfang Dong, Heng Key Lab. of Broadband Wireless Communication and Sensor Network Technol. Ministry of Education Nanjing University of Posts and Telecommunications Nanjing 210003 China

In this paperwe propose a practical interference alignment (IA) scheme for the downlink cellular systems with multi-carrier transmission over multi-input-multi-output (MIMO) channels, where the interference is decompounded into two parts (inter-cell and intra-cell interference). IA is used to effectively mitigate inter-cell interferences, while the intra-cell interference is suppressed by subcarrier allocation so that some spatial degrees of freedom are released. Assuming L Base stations each with M antennas and K users (having N antennas), we present that a necessary condition for zero inter-cell interference is (L-N)K ≤ M-1. In contrast, for a single-carrier MIMO cellular networks, the corresponding condition is known to be N + M ≥ LK + 1, which does not hold usually. An iterative optimization algorithm for the proposed scheme is given, and numerical results show that the proposed scheme achieves a high spectral efficiency when the number of users is large and the number of transmit and receive antennas is limited. © 2014 Binary Information Press.

关键词： Cells

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Nanofabrication: Programmable Bidirectional Folding of Metallic Thin Films for 3D Chiral Optical Antennas (Adv. Mater. 19/2017)

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Advanced Materials 2017年第19期29卷

作者： Yifei Mao Yun Zheng Can Li Lin Guo Yini Pan Rui Zhu Jun Xu Weihua Zhang Wengang Wu National Key Laboratory of Science and Technology on Micro/Nano Fabrication Institute of Microelectronics Peking University Beijing 100871 P. R. China College of Engineering and Applied Sciences National Laboratory of Solid State Microstructures and Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing Jiangsu 210093 P. R. China Key Laboratory of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education College of Internet of Things Nanjing University of Posts and Telecommunications Nanjing Jiangsu 210096 P. R. China Electron Microscopy Laboratory Peking University Beijing 100871 P. R. China Innovation Center for MicroNanoelectronics and Integrated System Beijing 100871 P. R. China

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Single image super resolution through neighbor embedding with non-local means and field of experts

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Journal of Computational Information Systems 2014年第5期10卷 1973-1981页

作者： Cao, Mingming Gan, Zongliang Cui, Ziguan Guo, Quanzhan Zhu, Xiuchang Key Lab. of Broadband Wireless Communication and Sensor Network Technology Min. of Edu. Image Process and Image Communication Lab. Nanjing University of Posts and Telecommunications Nanjing 210003 China

Super resolution (SR) through neighbor embedding is recognized as an effective way to produce a high resolution (HR) image. However, this learning-based method is clumsy at preserving sharper edges and suppressing unwanted artifacts. To reduce these artifacts, in this paper we proposed a novel single image super resolution through neighbor embedding with non-local means (NLM) and field of experts. The proposed SR approach is based upon an observation that small patches in natural images tend to redundantly repeat themselves many times, which could be exploited to improve the image reconstruction quality. In addition, considering the existence of un-normal texture in the reconstruction of HR images, which reduce the accuracy of the search process, we apply the Field of Experts model to remove the un-normal texture, which could also make the final image match the statistical characteristics of natural images. The experimental results show that the proposed method can achieve comparable performance to other leading algorithms. © 2014 Binary Information Press.

关键词： Image reconstruction

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Complete logic Bell-state analysis assisted with photonic Faraday rotation

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Physical Review A 2015年第4期92卷 042314-042314页

作者： Lan Zhou Yu-Bo Sheng College of Mathematics and Physics Nanjing University of Posts and Telecommunications Nanjing 210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing 210003 China Institute of Signal Processing Transmission Nanjing University of Posts and Telecommunications Nanjing 210003 China

The logic Bell-state which encodes many physical qubits in a logic qubit has great application potential in the future quantum communication field, for it is robust to the decoherence in a noisy environment. In this paper, we propose a complete logic Bell-state analysis (LBSA) with the help of the auxiliary single atoms trapped in the low-quality cavity. We construct the parity-check measurement gate based on the photonic Faraday rotation effect and complete the task combined with the Hadamard operation and single-qubit measurement. The number of physical qubits encoded in each logic qubit does not affect the analysis. We also discuss the application of this LBSA in the fields of quantum teleportation and logic-qubit entanglement swapping. Our LBSA protocol may have practical application in future long-distance quantum communication.

关键词： Quantum communication Faraday effect Qubits Decoherence (Quantum mechanics) Quantum teleportation

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Improved medical image registration based on mutual information and gradient information

Improved medical image registration based on mutual informat...

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2013 International Conference on Human Health and Medical Engineering, HHME 2013

作者： Zhang, Dengyin Tan, Liping Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Nanjing China

ISBN: (纸本)9781845648923

Image registration based on mutual information is widely employed in medical image processing. But this method may lead to the wrong result of registration due to the excessive local maximum points and low accuracy. As the imaging parameters of the same organs are changeless, the gray values from different images are related. Thus this paper constructed the weighted factors for the different gray pairs that represent the different registration accurate levels to improve the registration accuracy and robustness. Meanwhile, this paper introduced the difference between gradient modules which can reflect intensity of gray change on the basis of traditional gradient similarity metric function to improve accuracy. Tests prove that this new method has an improved attribute in aspects of the more obvious climaxes of parameters' curves, the finding of the extreme point, higher accuracy, and stronger robustness. © 2014 WIT Press.

关键词： Image registration

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Normal Inverse Gaussian Approximation to Downlink Inter-cell Interference

Normal Inverse Gaussian Approximation to Downlink Inter-cell...

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IEEE International Conference on communications

作者： Xiaojun Yan Jing Xu Yuanping Zhu Yang Yang Guoping Tan Key Laboratory of Wireless Sensor Network & Communication Shanghai Institute of Microsystem and Information Technology (SIMIT) Chinese Academy of Sciences (CAS) Telecommunications Lab Saarland University

ISBN: (纸本)9781467364300

In orthogonal frequency division multiple access (OFDMA)-based cellular networks subject to the distance-dependent path loss and shadow fading (SF), the downlink inter-cell interference (ICI) for a given user equipment (UE) is essentially a sum of several lognormal random variables (RVs). So far, no method of approximating the lognormal sum distribution is explicitly accurate when the component lognormal RVs with different logarithmic means and logarithmic variances are correlated. In this paper, the Normal Inverse Gaussian (NIG) distribution is proposed to approximate the downlink ICI for a given UE with the correlated SF. First, the downlink ICI is modelled as a sum of several correlated lognormal RVs. Then original moments of the lognormal sum in the logarithmic domain are obtained analytically. Finally the estimated parameters of the NIG distribution are computed explicitly by the mean, variance, skewness and kurtosis of the lognormal sum in the logarithmic domain through moment matching. Numerical results verify the accuracy of the NIG approximation when the correlated component lognormal RVs have different logarithmic means and logarithmic variances, and show that the NIG approximation outperforms the MGF-based lognormal approximation in various scenarios.

关键词： Approximation methods Downlink Interference wireless communication Correlation Monte Carlo methods Fading

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Mixed-norm subspace pursuit algorithm for compressed sensing in the presence of impulsive noise

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Journal of Computational Information Systems 2014年第13期10卷 5637-5648页

作者： Ji, Yunyun Yang, Zhen College of Communication and Information Engineering Nanjing University of Posts and Telecommunications Nanjing China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing China

The subspace pursuit algorithm in compressed sensing cannot achieve desirable reconstruction performance in the presence of impulsive noise based on the fact that the support detection and least squares are not robust to the impulsive noise. And then we propose a mixed-norm subspace pursuit algorithm to achieve sparse reconstruction in the impulsive noise environment. The mixed-norm subspace pursuit algorithm takes advantage of mutual influence of two different residuals to iteratively improve the performance of support detection and measurement set detection. It has significant characteristics: effectiveness in additive Gaussian white noise environment and robustness to impulsive noise, which have been verified by theoretical and experimental results. © 2014 by Binary Information Press

关键词： Compressed sensing

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Approaching the ideal quantum key distribution with two-intensity decoy states

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Physical Review A 2015年第2期92卷 022332-022332页

作者： Chun-Hui Zhang Sun-Long Luo Guang-Can Guo Qin Wang Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications Nanjing 210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing 210003 China Academy of Mathematics and Systems Science Chinese Academy of Sciences 100190 Beijing China Key Laboratory of Quantum Information University of Science and Technology of China Hefei 230026 China

We present a scheme for the practical decoy-state quantum key distribution with heralded single-photon source. In this scheme, only two-intensity decoy states are employed. However, its performance can approach the asymptotic case of using infinite decoy states. We compare it with the standard three-intensity decoy-state method, and through numerical simulations, we demonstrate its significant improvement over the three-intensity method in both the final key rate and the secure transmission distance. Furthermore, when taking statistical fluctuations into account, a very high key generation rate can still be obtained even at a long transmission distance.

关键词： QUANTUM mechanics PHOTON number COMPUTER simulation DISTRIBUTION (Probability theory) PARAMETER estimation

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An Improved DV-Hop Positioning Algorithm for wireless sensor network

An Improved DV-Hop Positioning Algorithm for Wireless Sensor...

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2015 IEEE International Conference on Progress in Informatics and Computing(PIC 2015)

作者： Jiuhu Zheng Huanyan Qian Lie Wang School of Computer Science and Engineering Nanjing University of Science and Technology School of Information Technology Jiangsu Institute of Commerce Key Lab of Broadband Wireless Communication and Sensor Network Technology ( Nanjing University of Posts and Telecommunications) Ministry of Education National Mobile Communications esearch Laboratory Southeast University

In the view of the DV-Hop positioning algorithm which relies on the distance vector and beacon nodes, several aspects are improved: the average hop distance and hop count are corrected;a method to detect the abnormal distribution of beacon nodes is used to avoid the influence of the abnormal distribution on the positioning performance. The proposed algorithm is simple and effective. Simulation results show that compared with the traditional DV-Hop algorithm, the performance of the proposed algorithm is greatly *** performance is even even superior to that of the algorithm mentioned in literature [10]

关键词： wireless sensor network DV-Hop algorithm node positioning positioning accuracy

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