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Lecture Notes in Computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2014年 8854卷 148-157页

作者： Morales-Cordovilla, Juan A. Pessentheiner, Hannes Hagmüller, Martin González, José A. Kubin, Gernot Signal Processing and Speech Communication Laboratory Graz University of Technology Austria Dept. of Computer Science University of Sheffield United Kingdom

ISBN: (纸本)9783319136226

This paper addresses the problem of distant speech recognition in reverberant noisy conditions employing a star-shaped microphone array and vector Taylor series (VTS) compensation. First, a beamformer yields an enhanced single-channel signal by applying convex (CVX) optimization over three spatial dimensions given the spatio-temporal position of the target speaker as prior knowledge. Then, VTS compensation is applied over the speech features extracted from the temporal signal obtained by the beamformer. Finally, the compensated features are used for speech recognition. Due to a lack of existing resources in German to evaluate the proposed enhancement framework, this paper also introduces a new speech database. In particular, we present a medium-vocabulary German database for microphone array made of embedded clean signals contaminated with real room impulsive responses and mixed in a ‘natural’ way with real noises. We show that the proposed enhancement framework performs better than other related systems on the presented database. © Springer International Publishing Switzerland 2014.

关键词： Database systems

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The improved neural network algorithm of license plate recognition

International Journal of Signal Processing, Image Processing...

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International Journal of signal processing, Image processing and Pattern Recognition 2015年第5期8卷 49-54页

作者： Dong, Jingwei Sun, Meiting Liang, Gengrui Jin, Kui School of Measure-Control Technology and Communication Engineering The higher educational key laboratory for Signal and Information Processing of Heilongjiang Province Harbin University of Science and Technology Harbin China School of Electric and Electronic Engineering Harbin University of Science and Technology Harbin China

With high definition cameras are widely used in urban traffic monitoring, the resolution of vehicle and traffic monitoring image rises. As the main component of intelligent traffic system, the vehicle license plate recognition technique faces new challenges and some new demands are put forward. Aiming at the problems of cutting down the time delay and eliminating characters outside of vehicle license plate, a set of license plate recognition algorithm is developed in this paper. The process of recognition in this paper is divided into four parts: image preprocessing, license plate location, license plate segmentation and character recognition. In license plate location, an accelerating matching method based on particle image correlation method is employed. In character recognition, an improved BP neural network algorithm is employed. The principle, procedure and simulation of the algorithm is described in details. High definition images with 2 mega pixels are used as the input of simulation. © 2015 SERSC.

关键词： Image enhancement

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Queue-Aware Joint Remote Radio Head Activation and Beamforming for Green Cloud Radio Access Networks

Queue-Aware Joint Remote Radio Head Activation and Beamformi...

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IEEE Global Communications Conference

作者： Jian Li Jingxian Wu Mugen Peng Wenbo Wang Vincent K. N. Lau Wireless Signal Processing and Network Laboratory Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications ELEG University of Arkansas Department of ECE Hong Kong University of Science and Technology

ISBN: (纸本)9781479959532

The cloud radio access network (C-RAN) is an emerging network architecture that holds the promise of coping with the explosive growth of mobile wireless data. In this paper, by considering the stochastic traffic arrivals and time-varying channel conditions, we address the stochastic optimization of joint remote radio head (RRH) activation and linear beamforming to maintain delay performance and minimize average network power consumption in downlink slotted C-RAN. We first formulate the joint optimization as a group sparse beamforming problem. Based on Lyapunov optimization technique, the stochastic optimization problem is then transformed into a queue-aware joint RRH activation and beamforming problem, which can be greedily solved at each slot. Finally, a low-complexity stationary algorithm with guaranteed convergence and closed-form expressions is proposed. The proposed algorithm can be implemented in a parallel manner, thus it is highly scalable to a large-sized C-RAN. Extensive numerical simulations validate the effectiveness of the proposed algorithm.

关键词： Beamforming Wireless networks wireless data time-varying channels RRH gene Joints Joints Power consumption NETWORK STRUCTURE wall coping Radio CLOUDS Clouds

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Vehicles categorization in complex background

Vehicles categorization in complex background

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2014 International Conference on Applied sciences, Engineering and technology, ICASET 2014

作者： Xiang, Ying Zhuo Yang, Dong Mei Yan, Ji Kun National Key Laboratory of Science and Technology on Blind Signal Processing Chengdu China

ISBN: (纸本)9783038351849

This paper presents a novel approach to categorize multi-view vehicles in complex background using only two dimension characteristic vectors instead of high dimension vectors. Vehicles have large variability of models and the view-point makes the appearance change dramatically. Significant characteristics should be chosen as the evidence to categorize. In this paper, we categorize the vehicles into two categories - cars and lorries. Line detection method is used and calculating the average line length and the number of parallel lines as the two characteristics. A linear classifier is trained using 30 different view cars and lorries as the training set and an 10 additional different cars and lorries as the testing set. © (2014) Trans Tech Publications, Switzerland.

关键词： Vehicles

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Hash technology for connection management in high-speed networks

Hash technology for connection management in high-speed netw...

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2014 International Conference on Applied sciences, Engineering and technology, ICASET 2014

作者： Liu, Rong Ji Li, Yun Zhao Cao, Chun Xia National Key Laboratory of Science and Technology on Blind Signal Processing Chengdu China

ISBN: (纸本)9783038351849

Connection management uses hash table. Hash function and data structure are both the bottleneck technology. For balancing computation cost and uniformity of hash function, three new hash functions were devised--the Random number Mapping XOR(RMX) Hash Function based on random number table mapping, the Segment Sampling XOR(SSX) Hash Function and Byte by Byte Shift XOR(BBSX) Hash Function based on segment generation and bit operations. The results show that these three functions are all better than IP Shift-XOR(IPSX) Hash Function on uniformity. This paper analyzed memory access performance and miss rate of multiple slots hash table, and presented the technical idea for shorting packet process time in connection management. Simulation for multiple slots hash table is described. © (2014) Trans Tech Publications, Switzerland.

关键词： Hash functions

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On the encoding complexity of systematic polar codes

On the encoding complexity of systematic polar codes

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IEEE International SOC Conference

作者： Liping Li Wenyi Zhang Key Laboratory of Intelligent Computing and Signal Processing of the Ministry of Education of China Anhui University China Chinese Academy of Sciences and Department of Electronic Engineering and Information Sciences University of Science and Technology of China

Systematic polar codes are proposed by Arikan and are shown to have better BER performance than non-systematic polar codes. From a recursive decomposition of the generator matrix of polar codes, Arikan showed that the encoding complexity of systematic polar codes is also O(N log N) where N is the code block length. But the recursive process involves some additional calculations in transforming the problem instances back and forth. In this paper, by using the sparsity property of the generator matrix, we propose an encoding process which has the same complexity as non-systematic polar codes in the presence of an additional memory array. Without the additional memory elements, the number of additions of the proposed encoding process increases compared with non-systematic polar codes. We also provide an analysis to quantify this additional increase of the complexity.

关键词： Encoding Systematics Complexity theory Decoding Generators Bit error rate Electronic mail

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A saliency detection method based on global contrast

International Journal of Signal Processing, Image Processing...

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International Journal of signal processing, Image processing and Pattern Recognition 2015年第7期8卷 111-122页

作者： Yu, Chun-Yan Zhang, Wei-Shi Wang, Chun-Li Institute of Information and Science Technology Dalian Maritime University China Key Laboratory of Intelligent Computing and Signal Processing Ministry of Education Anhui University No.3 Feixi Road Hefei China

To highlight the saliency object clearly from the foreground, we propose a saliency detection method based on global contrast with cluster. Due to the fact that background pixels usually have similar patches, we use cluster analysis to merge the background regions. By using mean shift filter, the background pixels with similar color level are clustered and the saliency calculation can be decreased a lot. In the method, we use the contrast of color feature with all the other pixels to compute the saliency map. A weight coefficient is utilized to improve the detection accuracy in global contrast differences evaluation. The results of extensive experiments on public dataset show that our method perform well and can highlight the salient object clearly against the other five state-of-the-art methods. Besides, we demonstrate that the applications in image segmentation and fusion with our saliency map can get satisfactory results. © 2015 SERSC.

关键词： Image segmentation

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A broadband polarization insensitive graphene absorber with wide incident angle

A broadband polarization insensitive graphene absorber with ...

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International Conference on Computational Problem-Solving (ICCP)

作者： Y. Wang Y. N. Jiang S. M. Li W. P. Cao X. Gao X. H. Yu R. Yuan Guangxi Experiment Center of Information Science Guilin China Guangxi Key Laboratory of Wireless Wideband Communication & Signal Processing Guilin University of Electronic Technology Guilin China School of Electrical and Information Engineering Guangxi University of Science and Technology Liuzhou China

ISBN: (纸本)9781467365451

The development of radar technology is a serious threat to the stealth of aircraft. To decrease the radar cross section (RCS) and enhance the stealth ability of targets, the absorber can be used. Based on graphene in this paper, a broadband absorber is proposed. The absorption rate of the proposed absorber is more than 90% in the 2.1-9.0GHz range with the relative bandwidth of 123%. Moreover, it has the microwave absorbing properties of polarization insensitive and wide incident angle range.

关键词： Graphene Absorption Impedance Broadband communication Conductivity Chemicals Bandwidth

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Multiple-input multiple-output over-the-horizon radar beamforming with uniform circular arrays 7

Multiple-input multiple-output over-the-horizon radar beamfo...

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2014 7th International Congress on Image and signal processing, CISP 2014

作者： Zhang, Yi Yuxiong, Jin National Key Laboratory of Science and Technology on Blind Signal Processing Chengdu610041 China

ISBN: (纸本)9781479958351

Multiple-input Multiple-output (MIMO) radar is a new radar system which utilizes multiple antennas at both the transmitting side and the receiving side. In order to suppress the spread-Doppler sea clutter and eliminate the multipath and multimode clutter when detecting slow-moving ships, some OTHR researchers began to propose that applying the technology of MIMO radar to the next generation of sky-wave OTHR. It reaches this by MIMO beamforming which can be formed on both transmit with non-causal adaptive beamforming and receive and uses this transmit and receive 2D selectivity as the basis of a strategy for minimizing spread-Doppler sea clutter and the multipath and multimode clutter. Uniform linear arrays (ULA) can only use one-dimension in azimuth which is the main array in current generation OTHR systems. This paper considers introducing uniform circular arrays (UCA) in OTHR and we apply MIMO adaptive non-causal beamforming to UCA to achieve elevation filtering capability. Theoretical analysis and simulation results have been presented. © 2014 IEEE.

关键词： Beamforming

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Energy efficient feedback design for coordinated multi-point transmission in downlink

International Journal of Signal Processing, Image Processing...

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International Journal of signal processing, Image processing and Pattern Recognition 2015年第6期8卷 155-166页

作者： Wang, Yi Hu, Yanjun Zhou, Yiqing Key Laboratory of Intelligent Computing and Signal Processing Ministry of Education Anhui University Hefei China School of Electronic Science and Technology Anhui University Hefei China Institute of Computing Technology Chinese Academy of Sciences Beijing China

Coordinated multi-point (CoMP) has been raised to increase the average cell throughput and the cell-edge user throughput. However, the energy consumption of mobile stations (MSs) is a key problem restricting the wide application of CoMP systems. Considering the energy consumption of feeding back channel state information (CSI) by MSs and the influence of CSI accuracy on the throughput of system, it is proposed to measure the relationship between feedback energy consumption and throughput with energy efficiency feedback utility (EEFU) function which can adapt to different application scenes by adjusting utilization coefficient. The feedback utilization of two precoders in CoMP systems is analyzed respectively, including the optimization allocation of feedback bits with utility function. The complete EEFU optimized expression and the optimizing flow path satisfying the actual application demands of CoMP systems are then derived. The simulation results illustrate the practicability and necessity of the EEFU function and verify the performance of EEFU with different precoders. © 2015 SERSC.

关键词： Energy efficiency

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