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Design and simulation of a Torus topology for network on chip

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Journal of Systems Engineering and Electronics 2008年第4期19卷 694-701页

作者： Wu Chang Li Yubai Chai Song dsp lab School of Communication and Information Engineering~Univ. of Electronic Science and Technology of China Chengdu 610054 P. R. China

Aiming at the applications of NOC （network on chip） technology in rising scale and complexity on chip systems, a Torus structure and corresponding route algorithm for NOC is proposed. This Torus structure improves traditional Torus topology and redefines the denotations of the routers. Through redefining the router denotations and changing the original router locations, the Torus structure for NOC application is reconstructed. On the basis of this structure, a dead-lock and live-lock free route algorithm is designed according to dimension increase. System C is used to implement this structure and the route algorithm is simulated. In the four different traffic patterns, average, hotspot 13%, hotspot 67% and transpose, the average delay and normalization throughput of this Torus structure are evaluated. Then, the performance of delay and throughput between this Torus and Mesh structure is compared. The results indicate that this Torus structure is more suitable for NOC applications.

关键词： network on chip Torus route System C simulation

A SYSTEM IDENTIFICATION METHOD USING VECTOR SPACE BASE FUNCTION

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Journal of Electronics(China) 1999年第2期16卷 146-151页

作者： Lu Ziyi Yang Luxi He Zhenva(dsp lab., Southeast University, Nanjing 210096) dsp lab. Southeast University Nanjing

This paper presents a new system identification approach using vector space base functions, and proposes two network structures based on Gamma sequence and Laguerre sequence. After analyzing and comparing these struct... 详细信息

关键词： System identification Vector space base functions Adaptive filter

A Fast Algorithm for Automated Quality Control in Surface Engineering

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Journal of Surface Engineered Materials and Advanced Technology 2012年第2期2卷 120-126页

作者： Ehsan Sheybani Singli Garcia-Otero Fedra Adnani Giti Javidi dsp lab Virginia State University Petersburg USA.

In this article an approach to surface image quality assessment for surface pattern and object recognition, classification, and identification has been described. The surface quality assessment finds many industrial applications such as auto-mated, advanced, and autonomous manufacturing processes. Given that in most industrial applications the target surface is an unknown variable, having a tool to measure the quality of the surface in real time has a significant value. To add to the complication, in most industrial applications, the surface (and therefore its image) suffers from several physical phenomena such as noise (of several different kinds), time, phase, and frequency shifts, and other clutter caused by interference and speckles. The proposed tool should also be able to measure the level of deterioration of the surface due to these environmental effects. Therefore, evaluation of quality of a surface is not an easy task. It requires a good understanding of the processing methods used and the types of environmental processes affecting the surface. On the other hand, for a meaningful comparative analysis, some effective parameters have to be chosen and qualitatively and quantitatively measured across different settings and processes affecting the surface. Finally, any algorithm capable of handling these tasks has to be efficient, fast, and simple to qualify for the “real-time” applications.

关键词： Surface Characterization Advanced Techniques

Blind speech source separation via nonlinear time-frequency masking

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Chinese Journal of Acoustics 2008年第3期27卷 203-214页

作者： XU Shun CHEN Shaorong LIU Yulin dsp lab. Chongqing Communication College Chongqing 400035

Aim at the underdetermined convolutive mixture model, a blind speech source separation method based on nonlinear time-frequency masking was proposed, where the approximate W-disjoint orthogonality （W-DO） property among independent speech signals in time-frequency domain is utilized. In this method, the observation mixture signal from multimicrophones is normalized to be independent of frequency in the time-frequency domain at first, then the dynamic clustering algorithm is adopted to obtain the active source information in each time-frequency slot, a nonlinear function via deflection angle from the cluster center is selected for time-frequency masking, finally the blind separation of mixture speech signals can be achieved by inverse STFT （short-time Fourier transformation）. This method can not only solve the problem of frequency permutation which may be met in most classic frequency-domain blind separation techniques, but also suppress the spatial direction diffusion of the separation matrix. The simulation results demonstrate that the proposed separation method is better than the typical BLUES method, the signal-noise-ratio gain （SNRG） increases 1.58 dB averagely.

关键词： separation method blind separation Fourier transformation clustering algorithm simulation results nonlinear function deflection angle information in cluster center mixture model

A Novel Algorithm for the Weak GPS Signals Acquisition

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A Novel Algorithm for the Weak GPS Signals Acquisition

A Novel High-sensitivity ADS-B Receiver Based on RF Direct Logarithmic Detecting

2012年计算机应用与系统建模国际会议

作者： Huan Li Yubai Li Wei Peng Bolong Wen dsp lab School of Communication and Information EngineeringUniversity of Electronic Science and Technology of China

The acquisition of weak GPS signals is a challenging problem. The current methods for acquisition of weak GPS signals mainly depend on aiding, in which the GPS receiver needs priori information from base-station to promote weak GPS signal acquisition and tracking. It is unavailable in some remote locations since the area may not be covered by the base-station. On the other hand, in the state-of-art unaided GPS receivers, the weak GPS signals acquisition requires long Pre-detection Integration Time (PIT), such that the computation is complex and time-consuming. This paper proposes a computational efficient method to speed up acquisition operations. Finally, we evaluate the efficiency of the method through simulations.

关键词： weak GPS signals acquisition Blocked method

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A Novel High-sensitivity ADS-B Receiver Based on RF Direct L...

A New Algorithm and Its Implementations for RC Filters

2012年计算机应用与系统建模国际会议

作者： Wei Peng Yubai Li Huan Li Bolong Wen dsp lab School of Communication and Information Engineering University of Electronic Science and Technology of China

ADS-B will significantly increase the availability and quality of air traffic surveillance of future air traffic management systems. The circuit design of traditional ADS-B receiver based on superheterodyne receiving is complex but the sensitivity is not so satisfactory. This paper proposes a novel high-sensitivity ADS-B receiver, which is totally different from the traditional superheterodyne ADS-B receiver. The sensitivity, noise figure, spurious-free dynamic range and bit error rate of the receiver are analyzed in this paper. Finally, the performance of the receiver is tested by both signals from analog signal generator and signals from real world.

关键词： ADS-B Receiver direct logarithmic detecting high sensitivity

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通讯和计算机（中英文版） 2010年第11期7卷 54-57页

作者： Guoliang Zeng Motorola dsp lab. at Department of Engineering Arizona State University Polytech AZ 85212 USA

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改进的MB-OFDM UWB信道估计算法

微波学报 2010年第S1期26卷 666-670页

作者：张先玉刘郁林重庆通信学院dsp实验室 400035

在MB-OFDM UWB系统中,传统的信道估计方法没有充分利用信道长度这一信息,估计信道长度常大于实际长度,造成了性能损失。针对这一缺陷,提出一种新的信道估计算法。首先利用LS算法估计出信道,然后通过信号能量估计(SEE)方法估计出信道长... 详细信息

在MB-OFDM UWB系统中,传统的信道估计方法没有充分利用信道长度这一信息,估计信道长度常大于实际长度,造成了性能损失。针对这一缺陷,提出一种新的信道估计算法。首先利用LS算法估计出信道,然后通过信号能量估计(SEE)方法估计出信道长度。算法有效地降低了估计维数,因此提高了LS算法的估计性能,同时对各算法的性能进行了分析比较。最后利用实验仿真证实了算法的有效性和分析的正确性。

关键词：多频带正交频分复用超宽带信道估计信号能量估计

Software Radio: A Review of Design Considerations and Digital Hardware Choices

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China Communications 2009年第1期6卷 64-72页

作者： Parul Gupta Pradipta Dey Shivkumar Kalyanaraman Wang Qing Chen Jianwen Lin YongHua IBM India Research lab Bangalore IBM India Research lab Delhi IBM China Research lab Beijing

This paper reviews the requirements for Software Defi ned Radio (SDR) systems for high-speed wireless applications and compares how well the different technology choices available-from ASICs, FPGAs to digital signal p... 详细信息

关键词： ASIC FPGA dsp GPP processor software radio SDR wireless networks