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IEEE Global communications Conference

作者： Maximo Morales Cespedes Jorge Plata-Chaves Dimitris Toumpakaris Ana Garcia Armada Department of Signal Theory and Communications. University Carlos III of Madrid Stadius Center for Dynamical Systems Signal Processing and Data Analytics Department of Electrical & Computer Engineering. University of Patras

ISBN: (纸本)9781479935130

A cognitive Blind Interference Alignment scheme is devised for use in macro-femto cellular networks. The proposed scheme does not require any channel state information at the transmitter or data sharing among the Macro Base Station and the Femto Access Points. It achieves transmission to femto cell users without affecting the rates of the Macro users. This is achieved by appropriately combining the supersymbols of the Macro Base Stations and the Femto Access Points. It is shown that in some scenarios the use of this scheme results to considerable rates for Femto users.

关键词： Interference Femtocells Noise Transmitting antennas Wireless communication Macrocell networks

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Optimizing Dynamical Similarity Index Extraction Window for Seizure Detection

Optimizing Dynamical Similarity Index Extraction Window for ...

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

作者： Leila Azinfar Ahmed Rabbi Mohammdreza Ravanfar Sima Noghanian Reza Fazel-Rezai Biomedical Signal and Image Processing Laboratory Hawaii Center for Advanced Communications University of Hawaii Department of Electrical Engineering University of North Dakota Biomedical Signal and Image Processing Laboratory Electrical Engineering Department University of North Dakota

ISBN: (纸本)9781424479276

This paper addresses an optimization problem in choosing optimum window length for feature extraction in automatic seizure detection. The processing window length plays an important role in reducing the false positive and false negative rates and decreasing required processing time for seizure detection. This study presents an approach for selecting the optimum window length toward the extraction of dynamical similarity index (DSI) feature. Then, the optimal window value in DSI extraction was used to detect seizure onset automatically. The algorithm was applied to electroencephalogram (EEG) signals from European Epilepsy Database. Although the main purpose of this study was not the seizure detection and mainly focuses on proposing an approach for finding an optimum window length for feature extraction towards the early seizure detection, the results showed that the proposed method achieves 83.99% of sensitivity in seizure detection. The low false positive rate per hour (FPR/h) was also significant due to continuous EEG analysis. The method showed fast computation speed which promises a potential for the real time applications. The proposed method for the window optimization in feature extraction of DSI can be implemented for other features to further improve the performance of seizure detection.

关键词： Feature extraction Electroencephalography Indexes Optimization Epilepsy Sensitivity

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Expectation propagation approach to joint channel estimation and decoding for OFDM systems

Expectation propagation approach to joint channel estimation...

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2014 IEEE International Conference on Acoustics, Speech, and signal processing, ICASSP 2014

作者： Wu, Sheng Kuang, Linling Ni, Zuyao Lu, Jianhua Huang, Defeng David Guo, Qinghua Department of Electronic Engineering Tsinghua University China Tsinghua Space Center Tsinghua University China Research Institute of Information Technology Tsinghua University China Shenzhen Key Laboratory of Wireless Broadband Communication and Signal Processing China School of Electrical Electronic and Computer Engineering University of Western Australia Australia School of Electrical Computer and Telecommunications Engineering University of Wollongong Australia

ISBN: (纸本)9781479928927

We propose a message-passing algorithm of joint channel estimation and decoding for OFDM systems, where expectation propagation is exploited to deal with channel estimation. Specially, the message updating is formulated into a recursive form. As a result, for system with K subcarriers and L channel taps, only O(K + L) messages need to be tracked, and meanwhile they can be efficiently calculated using FFT with complexity O(K-A- + K log2 K), where -A- denotes the constellation size. Numerical experiments show that our algorithm achieves BER performance within 0.5 dB of the known-channel bound. © 2014 IEEE.

关键词： Orthogonal frequency division multiplexing

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Expectation propagation based iterative group wise detection for large-scale multiuser MIMO-OFDM systems

Expectation propagation based iterative group wise detection...

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2014 IEEE Wireless communications and Networking Conference, WCNC 2014

作者： Wu, Sheng Kuang, Linling Ni, Zuyao Lu, Jianhua Huang, Defeng David Guo, Qinghua Department of Electronic Engineering Tsinghua University Beijing China Tsinghua Space Center Tsinghua University Beijing China Research Institute of Information Technology Tsinghua University Beijing China Shenzhen Key Laboratory of Wireless Broadband Communication and Signal Processing Shenzhen China School of Electrical Electronic and Computer Engineering University of Western Australia Australia School of Electrical Computer and Telecommunications Engineering University of Wollongong Australia

ISBN: (纸本)9781479930838

For the spatially correlated multiuser MIMO-OFDM channels, the conventional iterative MMSE-SIC detection suffers from a considerable performance loss. In this paper, we use the factor graph framework to design robust detection algorithms by clustering a group of symbols to combat the spatial correlation and using the principle of expectation propagation to improve message passing. Furthermore, as the complexity of detection becomes one of the issues in the design of large-scale multiuser MIMO-OFDM systems, we propose a low-complexity approximate message-passing algorithm by opening the channel transition node, which eliminates the expensive matrix inversions involved in the MMSE-SIC based algorithms. Finally, numerical results are presented to verify the proposed algorithms. © 2014 IEEE.

关键词： Message passing

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Iteratively detected and svd-assisted mimo multimode transmission schemes

Communications in Computer and Information Science

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communications in computer and Information Science 2014年 455卷 119-134页

作者： Aust, Sebastian Ahrens, Andreas Lochmann, Steffen Department of Electrical Engineering and Computer Science Communications Signal Processing Group Hochschule Wismar University of Technology Business and Design Philipp-Müller-Straße 14 Wismar23966 Germany

In the recent past the concept of MIMO (multiple input multiple output) transmission over multimode fibers has attracted increasing interest in the optical fiber transmission community, targeting at increased fiber throughput or improved bit-error rate performance. In this contribution a coherent (2 ×2) MIMO (multiple input multiple output) transmission with iterative detection over a measured multimode fiber channel at 1325 nm as well as at 1570 nm operating wavelength is studied under the constraint of a given fixed data throughput and integrity. For the channel measurements a fibre length of 1,4 km were chosen. Extrinsic information transfer (EXIT) charts are used for analyzing and optimizing the convergence behaviour of the iterative demapping and decoding. Our results show that in order to achieve the best bit-error rate, not necessarily all MIMO layers have to be activated. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Multimode fibers

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Modal and chromatic dispersion analysis within a measured 1,4 km mimo multimode channel

Communications in Computer and Information Science

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communications in computer and Information Science 2014年 456卷 183-196页

作者： Ahrens, Andreas Schröder, Steffen Lochmann, Steffen Department of Electrical Engineering and Computer Science Communications Signal Processing Group Hochschule Wismar University of Technology Business and Design Philipp-Müller-Straße 14 Wismar23966 Germany

ISBN: (纸本)9783662447871

In the recent past the concept of MIMO (multiple input multiple output) transmission over multimode fibers has attracted increasing interest in the optical fiber transmission community, targeting at increased fiber throughput or improved bit-error rate performance. Mostly, the possible performance improvements are calculated by computer simulations, which require some knowledge about the underlying system. Here, measurements results can be helpful to improve the quality of the estimated performance improvements. That’s why in this contribution a signal theoretic multiple-input multiple-output (MIMO) system model for estimating modal and chromatic dispersion is developed. Based on channel measurements within a 1,4km MIMO multimode channel parameters for modal and chromatic dispersion are estimated. Furthermore, taking given parameters of the dispersion into account, the introduced signal theoretic MIMO system model enables a reconstruction of the MIMO specific impulse responses. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Chromatic dispersion

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Concise security bounds for practical decoy-state quantum key distribution

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Physical Review A 2014年第2期89卷 022307-022307页

作者： Charles Ci Wen Lim Marcos Curty Nino Walenta Feihu Xu Hugo Zbinden Group of Applied Physics University of Geneva Switzerland EI Telecomunicación Department of Signal Theory and Communications University of Vigo Spain Center for Quantum Information and Quantum Control Department of Physics and Department of Electrical & Computer Engineering University of Toronto Canada

Due to its ability to tolerate high channel loss, decoy-state quantum key distribution (QKD) has been one of the main focuses within the QKD community. Notably, several experimental groups have demonstrated that it is secure and feasible under real-world conditions. Crucially, however, the security and feasibility claims made by most of these experiments were obtained under the assumption that the eavesdropper is restricted to particular types of attacks or that the finite-key effects are neglected. Unfortunately, such assumptions are not possible to guarantee in practice. In this work, we provide concise and tight finite-key security bounds for practical decoy-state QKD that are valid against general attacks.

关键词： BOUNDS (Mathematics) QUANTUM states FEASIBILITY studies FAULT tolerance (engineering) EXPERIMENTAL groups

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On the performance of hybrid satellite-terrestrial cooperative networks with interferences 48

On the performance of hybrid satellite-terrestrial cooperati...

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48th Asilomar Conference on signals, Systems and computers, ACSSC 2015

作者： Lin, Min Ouyang, Jian Zhu, Wei-Ping PLA University of Science and Technology Nanjing210007 China National Mobile Communications Research Laboratory Southeast University Nanjing210096 China Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications Nanjing210003 China Department of Electrical and Computer Engineering Concordia University MontrealQCH3G1M8 Canada

ISBN: (纸本)9781479982974

The paper investigates the performance of a hybrid satellite-terrestrial cooperative network (HSTCN), where some terrestrial amplify-and-forward (AF) relays are employed to assist the signal transmission from a satellite to a destination, which is corrupted by multiple co-channel interferences (CCIs). In this system, the satellite links undergo Shadowing-Rician fading while the terrestrial links experience Rayleigh fading. Specifically, by assuming that maximum ratio combining (MRC) is used at the destination, we first derive the moment generating function (MGF) of the output signal-to-interference-plus-noise ratio (SINR). With the help of MGF, we then present the analytical average symbol error rate (ASER) expression for the considered cooperative system. Moreover, to gain further insights, the asymptotic ASER analysis in terms of the diversity order and array gain is also developed. Finally, numerical results are given to demonstrate the validity of the performance analysis and the impacts of shadowing parameters, relay number and CCIs on the considered HSTCN. © 2014 IEEE.

关键词： Rayleigh fading

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A Comparison of x-lets in Denoising cDNA Microarray Images

A Comparison of x-lets in Denoising cDNA Microarray Images

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IEEE International Conference on Acoustics, Speech and signal processing

作者： Rouzbeh Shams Hossein Rabbani Saeed Gazor Electrical & Computer Engineering Department Isfahan University of Technology Isfahan Iran Biomedical Engineering Department Medical Image & Signal Processing Research Center Isfahan University of Medical Science Isfahan 81745319 Iran Electrical & Computer Engineering Department Queen's University Kingston Canada

ISBN: (纸本)9781479928941

Microarray technology has become a power tool in the field of bioinformatics. It is used to measure gene expression levels and similar to any other image capturing processes is prone to noise. There are different kinds of noise, during preparation, hybridization and scanning in microarray images which usually are modeled by Gaussian noise. Since introduction of wavelets in 1970s, many more forms and extensions of this transform have been developed and used, such as stationary wavelet transform (SWT), complex wavelet transform (CWT), curvelet transform (CURV) and contourlet transform (CNT). By developing of more sparse transforms, it is important to have a perspective of how efficient the transforms are in different applications, such as microarray image analysis. In this paper, we compare the efficiency of common sparse transforms including ordinary discrete wavelet transform (DWT), SWT, CWT, CURV, CNT, Contourlet-SD decomposition, steerable pyramid (STP) and shearlet transform (SHR) for microarray image denoising. Therefore after converting microarray image into x-let transform, BayesShrink method, soft and hard thresholding are used to perform denoising of these images. Both local and general thresholds are calculated for each subband in order to evaluate the effect of incorporating intrascale dependency on top of sparsity property in statistical modeling of x-let's coefficients. Our simulation results show that CWT and SHR outperforms the others when using global thresholding and SWT is the preferred transform when using local thresholding. Although STP and SHR have better performance for some criteria like structural similarity (SSIM) index, but CWT is faster.

关键词： microarray denoising x-let transform wavelet Noise reduction Transform Microarray wavelets Standard Widget Toolkit Electric tools images SHIELDED PAIR global thresholding Local threshold

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A Performance Study of Spatial Modulation Systems Under Vehicle-to-Vehicle Channel Models

A Performance Study of Spatial Modulation Systems Under Vehi...

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IEEE Vehicular Technology Conference

作者： Yu Fu Cheng-Xiang Wang Raed Mesleh Xiang Cheng Harald Haas Yejun He Joint Research Institute for Signal and Image Processing Heriot-Watt University School of Information Science and Engineering Shandong University Electrical Engineering Department and SNCS Research Center University of Tabuk School of Electronics Engineering & Computer Science Peking University Joint Research Institute for Signal and Image Processing University of Edinburgh College of Information Engineering Shenzhen University

ISBN: (纸本)9781479944811

Spatial modulation (SM) is a relatively new multiple-input multiple-output (MIMO) technology that can provide high data rate with reasonable spectral efficiency. In this paper, the bit error rate (BER) performance of SM systems under vehicle-to-vehicle (V2V) channel models is investigated. The theoretical BER expression is given. The impact of some V2V channel model parameters on the underlying space-time correlation function (STCF) and the BER performance of SM systems are also studied. Simulation results indicate that modulation schemes, maximum Doppler frequency, the distance between the transmitter (Tx) and receiver (Rx), and antenna element spacings can affect the performance of SM systems.

关键词： Spatial modulation Vehicle-to-vehicle channel model Bit error rate Space-time correlation function

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