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40th IEEE International Conference on Acoustics, Speech, and signal processing, ICASSP 2015

作者： He, Bryan Wein, Alexander Srinivasan, Lakshminarayan Department of Computer Science California Institute of Technology United States Department of Mathematics Massachusetts Institute of Technology United States Neural Signal Processing Laboratory Stanford University United States

ISBN: (纸本)9781467369978

Conventional Nyquist sampling and reconstruction of square waves at a finite rate will always result in aliasing because square waves are not band limited. Based on methods for signals with finite rate of innovation (FRI), generalized Analog Thresholding (gAT-n) is able to sample square waves at a much lower rate under ideal conditions. The target application is efficient, real-time, implantable neurotechnology that extracts spiking neural signals from the brain. This paper studies the effect of integrator noise and quantization error on the accuracy of reconstructed square waves. We explore realistic values for integrator noise and input signal amplitude, using specifications from the Texas Instruments IVC102 integrator chip as a first-pass example because of its readily-available data sheet. ADC resolution is varied from 1 to 16 bits. This analysis indicates that gAT-1 is robust against these hardware non-idealities where gAT-2 degrades less gracefully, which makes gAT-1 a prime target for hardware implementation in a custom integrated circuit. © 2015 IEEE.

关键词： analog thresholding compressed sensing electrode arrays finite rate of innovation massive-scale neural recording neurotechnology optical methods square wave sub-Nyquist

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Measuring effects of different noises in a model using ISI-distance methods

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International Journal of Biomathematics 2015年第4期8卷 17-36页

作者： Jingyi Qu Rubin Wang Ying Du Tianjin Key Laboratory for Advanced Signal Processing College of Electronic Information EngineeringCivil Aviation University Tianjin 300300 P. R. China Institute for Cognitive Neurodynamics School of Science East China University of Science and Technology Shanghai 200237 P. R. China

This paper examines the effects of current and conductance noises in a minimal Hodgkin- Huxley type model of a cold receptor neuron. Current noise enters the membrane equation directly while conductance noise is propagated through the activation variables. Compared with common used interspike interval method, ISI-distance is a simple complementary approach to measure the different effects of current and conductance noises. ISI-distance extracts information from the interspike intervals by evaluating the ratio of instantaneous firing rates, which is parameter-free, time scale-independent and easy to visualize. Simulation results show that the most significant differences between different noise implementations in a pacemaker-like tonic firing regime at the transition to chaotic burst discharges.

关键词： Neural spike train current and conductance noise ISI-distance cold receptormodel impulse pattern.

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An integratable verifiable secret sharing mechanism

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International Journal of Network Security 2016年第4期18卷 617-624页

作者： Liu, Yanjun Chang, Chin-Chen Key Laboratory of Intelligent Computing and Signal Processing of Ministry of Education School of Computer Science and Technology Anhui University No. 111 Jiulong Rd Hefei230601 China Department of Computer Science and Information Engineering Asia University No. 500 Lioufeng Rd Wufeng Taichung413 Taiwan Department of Information Engineering and Computer Science Feng Chia University No. 100 Wenhwa Rd Seatwen Taichung413 Taiwan

Threshold secret sharing (SS), also denoted as (t, n) SS, has been used extensively in the area of information se- curity, such as for group authentication, cloud storage schemes, secure parallel communication and wireless mul- tipath routing protocols. However, a (t, n) SS cannot de- tect any deceptions among the dealer and shareholders. Veriable secret sharing (VSS) overcomes the weakness of (t, n) SS in such a way that it is able to detect cheaters by verifying the validity of shares or the correctness of the recovered secret under the condition that both shares and the secret are not compromised. Recently, two non- interactive VSSs based on Asmuth-Bloom's SS were pro- posed by Harn et al. and Liu et al., respectively. Both VSSs require shareholders to examine the range of values of some integers related to the secret before recovering the secret, which is a time-consuming operation. In this paper, we propose a novel integratable VSS mechanism that integrates the concepts of the generalized Chinese remainder theorem (GCRT), Shamir's SS and Asmuth- Bloom's SS. Our proposed VSS can verify that the secret reconstructed by any t or more shareholders is the same as the one that the dealer has generated. Analysis shows that our proposed VSS can provide perfect secrecy and better efficiency.

关键词： Hash functions

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Improving secrecy performance via device-to-device jamming in cellular networks

Improving secrecy performance via device-to-device jamming i...

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International Conference on Wireless Communications and signal processing (WCSP)

作者： Jian Ouyang Min Lin Wei-Ping Zhu Kang An Lei Wang Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications Nanjing China Nanjing Institute of Telecommunication Technology Nanjing China Department of Electrical and Computer Engineering Concordia University Montreal QC Canada College of Communications Engineering PLA University of Science and Technology Nanjing China National Mobile Communications Research Laboratory Southeast University Nanjing China

ISBN: (纸本)9781509028610

In this paper, we study the secrecy performance of a cellular network, where a device-to-device (D2D) communication shares the spectral resources with a multi-antenna base station (BS). By assuming known the channel state information (CSI) of the legitimate user and using the maximal ratio transmission (MRT) at the BS, we first derive a closed-form expression of the ergodic secrecy capacity (ESC) for the wiretap channel as well as the ergodic capacity (EC) for the D2D link. Then, we present a simple yet efficient power allocation scheme to maximize the secrecy performance while satisfying the D2D transmission requirement. Finally, numerical results are given to demonstrate the merit of our study, concluding that the interference from the D2D communication can be exploited as a friendly jammer to enhance the security transmission in cellular networks.

关键词： Device-to-device communication Cellular networks Antennas Resource management Jamming Security Optimized production technology

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Sparse HMM-based speech enhancement method for stationary and non-stationary noise environments 40

Sparse HMM-based speech enhancement method for stationary an...

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40th IEEE International Conference on Acoustics, Speech, and signal processing, ICASSP 2015

作者： Deng, Feng Bao, Chang-Chun Kleijn, W. Bastiaan Speech and Audio Signal Processing Laboratory School of Electronic Information and Control Engineering Beijing University of Technology Beijing China School of Engineering and Computer Science Victoria University of Wellington New Zealand

ISBN: (纸本)9781467369978

We propose a sparse hidden Markov model (HMM)-based single-channel speech enhancement method that models the speech and noise gains accurately in both stationary and nonstationary environments. The objective function is augmented with an lp regularization term resulting in a sparse autoregressive HMM (SARHMM). The method encourages sparsity in the speech-and noise-modeling, which eliminates the ambiguity between noise and speech spectra and, as a consequence, provides improved tracking of the changes of both spectral shapes and power levels of non-stationary noise. Using the modeled speech and noise SARHMMs, we first construct an estimator to estimate the noise spectrum. Then a Bayesian speech estimator is used to obtain the enhanced speech. The test results indicate that the proposed speech enhancement scheme performs much better than the reference methods in non-stationary environments, while providing state-of-the-art performance for stationary conditions. © 2015 IEEE.

关键词： Gain Modeling Non-stationary Noise Sparse ARHMM Speech Enhancement

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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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A novel recognition method for hybrid modulation radar signals

A novel recognition method for hybrid modulation radar signa...

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IET International Radar Conference 2015

作者： Peng Xiong Liu-Li Wu Xiao-Hu Ru Qing He Zheng Liu Wen-Li Jiang College of Electronic Science and Engineering National University of Defense Technology Changsha Hunan P.R China National Key Laboratory of Science and Technology on Blind Signal Processing Chengdu Sichuan P.R. China

ISBN: (纸本)9781510822023

This paper proposes a method to identify the hybrid modulation signals. Firstly, the method utilizes instantaneous frequency (IF) of signals combined with histogram to classify conventional signals and hybrid modulation signals. Then an improved signal segmentation method is used to resolve the hybrid modulation signals to conventional signals. Experimental results show that the proposed method can identify seven kinds of typical radar signals, and achieve 94% recognition accuracy when SNR is 3dB.

关键词： conventional signals hybrid modulation signals instantaneous frequency signal segmentation

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Intelligent Proportional Trajectory Tracking Controllers:Using Ultra-local Model and Time delay estimation Techniques

Intelligent Proportional Trajectory Tracking Controllers:Usi...

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第27届中国控制与决策会议

作者： Haoping Wang Yang Tian Shiyan Ni Nicolai Christov Sino-French Joint Laboratory of Automation and Signal Processing School of AutomationNanjing University of Science and Technology Sino-French Joint Laboratory of Automation and Signal Processing LAGIS- CNRS UMR 8219Lille University of Science and Technology

This paper presents a new intelligent proportional control(i Ps) for trajectory tracking of nonlinear affine-in control systems with unknown internal *** referred proposed controller which is based on an ultra-local model and a time-delay estimation technique has a very simple structure and easily to be *** with the systems output feedback,the proposed controller dose not require any knowledge of nonlinear internal dynamics ensuring the trajectory tracking of systems ***,to validate the proposed method,a nonlinear cart system which includes different kind of frictions have been considered to compare with different model free controls of time delay estimation based control(TDEC) and recursive model free control(RMFC),and illustrates its corresponding performance and robustness.

关键词： Intelligent proportional control,Time delay estimation,Ultra-local Model,Recursive model free control

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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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