检索结果-内蒙古大学图书馆

IEEE Workshop on Signal processing Advances in Wireless Communications (SPAWC)

作者： Luis G. Ordóñez Daniel P. Palomar Javier R. Fonollosa Signal Processing and Communications Group Universitat Politécnica de Catalunya-Barcelona Tech Spain Department of Electric and Computer Engineering Hong Kong University of Science and Technology Hong Kong China

The diversity and multiplexing tradeoff (DMT) has been extensively applied in the literature to compare the high-SNR outage performance of relaying techniques and to propose new design guidelines. The problem with this approach is that the DMT provides only a coarse measure of performance and, hence, it is more convenient to adopt the diversity, multiplexing, and array gain (DMA) framework, in which the error probability is characterized by two parameters: the diversity gain (associated with the SNR exponent) and the array gain (related to the SNR offset). In this paper, we derive the DMA tradeoff associated with the cut-set bound outage probability of the static half-duplex MIMO relay under uncorrelated/semicorrelated Rayleigh fading and uncorrelated Rician fading. This provides an upper bound to the DMA tradeoff achievable by any relaying scheme.

关键词： Relays MIMO Multiplexing Arrays Signal to noise ratio Mutual information Diversity methods

来源：评论

学校读者我要写书评

暂无评论

Fundamental diversity, multiplexing, and array gain tradeoff under different MIMO channel models

Fundamental diversity, multiplexing, and array gain tradeoff...

引用

International Conference on Acoustics, Speech, and Signal processing (ICASSP)

Following the seminal work of Zheng and Tse on the diversity and multiplexing tradeoff (DMT) of MIMO channels, in this paper we introduce the array gain to investigate the fundamental relation between transmission rate and reliability in MIMO systems. The array gain gives information on the power offset that results from exploiting channel state information at the transmitter or as a consequence of the channel model. Hence, the diversity, multiplexing, and array gain (DMA) analysis can be directly translated into a parameterized characterization of its associated outage probability performance. In this paper we derive the fundamental DMA tradeoff achievable by any scheme in uncorrelated Rayleigh, semicorrelated Rayleigh, and uncorrelated Rician block-fading MIMO channels. We use these results to analyze the effect of important channel parameters in the outage performance at different points of the DMT curve.

关键词： Multiplexing Channel models Arrays Signal to noise ratio Rician channels Fading

来源：评论

学校读者我要写书评

暂无评论

Fusion of multispectral palmprint images for automatic person identification

Fusion of multispectral palmprint images for automatic perso...

引用

Electronics, Communications and Photonics Conference (SIECPC), Saudi International

作者： Abdallah Meraoumia Salim Chitroub Ahmed Bouridane Signal and Image Processing Laboratory Electronics and Computer Science Faculty Telecommunication Department University of Science and Technology of Houari Boumedienne Algiers Algeria School of Computing Engineering and Information Sciences Northumbria University Newcastle-upon-Tyne UK

Reliability and accuracy in personal identification system is a dominant concern to the security world. Biometric has gained much attention in this subject recently. Many types of personal identification systems have been developed, and palmprint identification is one of the emerging technologies. This paper presents a novel biometric technique to automatic personal identification system using multispectral palmprint technology. In this method, each of spectrum images are aligned and then used to extract palmprint features using 1D log-Gabor filter. These features are then examined for their individual and combined performances. Finally, the hamming distance is used for matching of palmprint features. The experimental results showed that the proposed method achieve an excellent identification rate and provide more security.

关键词： Feature extraction Databases Image fusion Discrete wavelet transforms Security Accuracy Hamming distance

来源：评论

学校读者我要写书评

暂无评论

Laser surface treatment of Mg-Al-Zn alloys

引用

Strojarstvo 2011年第1期53卷 5-10页

作者： Dobrzanski, Leszek Adam Tanski, Tomasz Malara, Szymon Domagala, Justyna Klimpel, Andrzej Division of Materials Processing Technology and Computer Techniques in Materials Science Institute of Engineering Materials and Biomaterials Silesian University of Technology ul. Konarskiego 18a 44-100 Gliwice Poland Welding Department Silesian University of Technology ul. Konarskiego 18a 44-100 Gliwice Poland

In this paper the structure and properties investigations results of the cast magnesium alloys in the as cast state, after heat treatment and laser surface treatment are presented. The aim of this work was to improve the surface layer properties of the Mg-Al-Zn cast magnesium alloys by melting and feeding of TiC, VC, WC, SiC, NbC and Al2O3 particles onto the surface. Laser processing was carried out using high diode power laser (HDPL). A series of experiments was carried out with varying scan rates and laser power. The resulting surface layers were examined using metallographic optical microscopy, scanning electron microscopy, X-ray diffraction, microhardness measurements and corrosion resistance tests. Mg-Al-Zn alloys after laser treatment are characterized by two zones: alloyed zone (AZ) and heat affected zone (HAZ) with different thickness and shape depending on laser power and ceramic powder used. Alloyed zone is composed mostly of dendrites with the Mg17Al12 lamellar eutectic and Mg in the interdendritic areas. The increase of microhardness from about 50 HV0,1 to about 200 HV0,1 in alloyed zone were observed.

关键词： Magnesium alloys

来源：评论

学校读者我要写书评

暂无评论

Audio signal processing using graphics processing units

引用

AES: Journal of the Audio Engineering Society 2011年第1-2期59卷 3-19页

作者： Savioja, Lauri Välimäki, Vesa Smith, Julius O. NVIDIA Research and Department of Media Technology Aalto University School of Science Espoo Finland Department of Signal Processing and Acoustics Aalto University School of Electrical Engineering Espoo Finland Center for Computer Research in Music and Acoustics Stanford University Stanford CA 94305 United States

Current graphics processing units (GPUs) are massively parallel computing environments offering remarkable performance boosts in parallelizable tasks. Audio signal processing is a potential application area. Three different cases for GPU implementation are studied: additive synthesis, fast Fourier transforms (FFT), and time-domain convolution. For additive synthesis nearly two million sine waves were computable in real time on the GPU, giving a factor of 250-3000 performance gain over CPU implementation. Similarly, the GPU was able to perform an FFT eight times longer than the CPU version in the same time. For a stereo signal the GPU was able to compute a two-million-point FFT and inverse FFT in real time with an input buffer size of 1024 samples at a sampling rate of 48 kHz with 50% overlap. Finally the GPU could compute approximately 130 times longer FIR filters than the CPU in the same time. For stereo input and output, requiring four filters altogether, the GPU processing was able to implement FIR filters of length 376 000 taps in real time. The latency in all these tasks is tolerable, since the performance is nearly optimal with a hundred-sample buffer, which corresponds to a few milliseconds. In summary the results show that GPUs are highly useful for computationally intensive audio signal processing tasks.

关键词： Graphics processing unit

来源：评论

学校读者我要写书评

暂无评论

Visual saliency detection by spatially weighted dissimilarity

Visual saliency detection by spatially weighted dissimilarit...

引用

Conference on computer Vision and Pattern Recognition (CVPR)

作者： Lijuan Duan Chunpeng Wu Jun Miao Laiyun Qing Yu Fu College of Computer Science and Technology Beijing University of Technology Beijing China Key Laboratory of Intelligent Information Processing Institute of Computing Technology Chinese Academy and Sciences Beijing China School of Information Science and Engineering Chinese Academy and Sciences Beijing China Department of Computing University of Surrey Guildford Surrey UK

In this paper, a new visual saliency detection method is proposed based on the spatially weighted dissimilarity. We measured the saliency by integrating three elements as follows: the dissimilarities between image patches, which were evaluated in the reduced dimensional space, the spatial distance between image patches and the central bias. The dissimilarities were inversely weighted based on the corresponding spatial distance. A weighting mechanism, indicating a bias for human fixations to the center of the image, was employed. The principal component analysis (PCA) was the dimension reducing method used in our system. We extracted the principal components (PCs) by sampling the patches from the current image. Our method was compared with four saliency detection approaches using three image datasets. Experimental results show that our method outperforms current state-of-the-art methods on predicting human fixations.

关键词： Humans Color Visualization Image color analysis Principal component analysis Correlation Computational modeling

来源：评论

学校读者我要写书评

暂无评论

Musical applications of real-time signal processing

引用

EURASIP Journal on Advances in Signal processing 2011年第1期2011卷 1-2页

作者： Jyri Pakarinen Jonathan S Abel Federico Fontana Victor Lazzarini Vesa Välimäki Department of Signal Processing and Acoustics Aalto University School of Electrical Engineering Espoo Finland CCRMA Stanford University Stanford USA Department of Mathematics and Computer Science University of Udine Udine Italy Sound and Music Technology Research Group National University of Ireland Maynooth Ireland

来源：评论

学校读者我要写书评

暂无评论

Quantifying Respiratory Variation with Force Sensor Measurements

Quantifying Respiratory Variation with Force Sensor Measurem...

引用

Annual International Conference of the IEEE Engineering in Medicine and Biology Society

作者： Joonas Paalasmaa Lasse Leppakorpi Markku Partinen *** Ltd Espoo Finland with Department of Computer Science University of Helsinki Helsinki Finland and with Department of Signal Processing Tampere University of Technology *** Ltd Helsinki Sleep Clinic Vitalmed Research Center Helsinki Finland and with Department of Clinical Neurosciences Helsinki University Central Hospital

ISBN: (纸本)9781424441211

Measuring the variation of the respiratory rate makes it possible to analyze the structure of sleep. The variation is high when awake or in REM sleep, and decreases in deep sleep. With sleep apnea, the respiratory variation is disturbed. We present a novel method for extracting respiratory rate variation from indirect measurements of respiration. The method is particularly suitable for force sensor signals, because, in addition to the respiratory phenomenon, they typically contain also other disturbing features, which makes the accurate detection of the respiratory rate difficult. Respiratory variation is calculated by low-pass filtering a force sensor signal at different cut-off frequencies and, at every time instant, selecting one of them for the determination of respiration cycles. The method was validated with a single-night reference recording, which showed that the proposed method detects the respiratory variation accurately. Of the 3421 calculated respiration cycle lengths, 95.9% were closer than 0.5 seconds to the reference.

关键词： force sensors Respiratory Rate Variation Sleep, Slow-Wave indirect measurement respiration Sleep Apnea Syndromes Sleep (REM) awake

来源：评论

学校读者我要写书评

暂无评论

Capacity of Multicarrier Multilayer Broadcast and Unicast Hybrid Cellular System with Independent Channel Coding over Subcarriers

Capacity of Multicarrier Multilayer Broadcast and Unicast Hy...

引用

IEEE Conference on Vehicular technology (VTC)

作者： Siqian Liu Hongxiang Li Guanying Ru Weiyao Lin Lingjia Liu Yang Yi Electrical and Computer Engineering Department North Dakota State University USA Electrical and Computer Engineering Department University of Louisville USA Institute of Image Communication and Information Processing Shanghai Jiao Tong University China Electrical Engineering and Computer Science Department University of Kansas Lawrence KS USA Technology Design Integration Department Texas Instruments Inc. Dallas TX USA

In this paper, we discuss the hybrid capacity region of a generic multicarrier multilayer broadcast and unicast cellular system with independent channel coding over subcarriers. In particular, we analytically derive the capacity region and provide conditions to achieve its boundary. The simulation results show that the hybrid capacity regions are considerably higher than those of the traditional time division multiplexing scheme.

关键词： Unicast HDTV Broadcasting Simulation Time division multiplexing USA Councils

来源：评论

学校读者我要写书评

暂无评论

Sparsely Encoded Local Descriptor for face recognition

Sparsely Encoded Local Descriptor for face recognition

引用

International Conference on Automatic Face and Gesture Recognition

作者： Zhen Cui Shiguang Shan Xilin Chen Lei Zhang School of Computer Science and Technology Huaqiao University Xiamen China Chinese Academy and Sciences Beijing China Key Laboratory of Intelligent Information Processing Institute of Computer Technology Chinese Academy and Sciences Beijing China Chinese Academy of Sciences Beijing Beijing CN Department of Computing Hong Kong Polytechnic University Hong Kong China

In this paper, a novel Sparsely Encoded Local Descriptor (SELD) is proposed for face recognition. Compared with K-means or Random-projection tree based previous methods, sparsity constraint is introduced in our dictionary learning and sequent image encoding, which implies more stable and discriminative face representation. Sparse coding also leads to an image descriptor of summation of sparse coefficient vectors, which is quite different from existing code-words appearance frequency(/histogram)-based descriptors. Extensive experiments on both FERET and challenging LFW database show the effectiveness of the proposed SELD method. Especially on the LFW dataset, recognition accuracy comparable to the best known results is achieved.

关键词： Face Dictionaries Pixel Training Feature extraction Face recognition Databases

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：