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Proceedings of the 2014 IEEE Students' Technology Symposium最新文献

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Synthesis of simultaneous sum and difference patterns in uniformly excited time-modulated linear arrays using firefly algorithm 用萤火虫算法合成均匀激励时调制线性阵列中同时和和差图
Pub Date : 2014-05-01 DOI: 10.1109/TECHSYM.2014.6807930
Ananya Mukherjee, S. K. Mandal, G. K. Mahanti, R. Ghatak
In this paper, sideband radiations which are generally regarded as the undesired effects of time-modulated antenna arrays (TMAAs), are exploited to design multi-beam antenna arrays. Time modulation (TM) is applied into uniformly excited linear array of half wave dipole radiators to generate low side-lobe sum and difference patterns at the center frequency and first sideband respectively while the maximum power level at the higher sidebands are suppressed significantly by optimizing the periodical on-off switching instants of the antenna elements by using fire-fly algorithm (FA). The FA optimized pattern as realized in MATLAB platform is validated by designing the uniformly excited time modulated linear array (UE-TMLA) in CST-MWS with the same on-time sequence as obtained by using FA and the patterns are compared.
本文利用边带辐射来设计多波束天线阵列,而边带辐射通常被认为是时调制天线阵列(TMAAs)的不良影响。将时间调制(TM)应用于均匀激发的半波偶极子辐射体线性阵列,在中心频率和第一边带分别产生低旁瓣和和和差图,同时利用萤火虫算法优化天线单元的周期性通断时刻,显著抑制高边带的最大功率电平。通过在CST-MWS中设计均匀激励时调制线性阵列(UE-TMLA),验证了在MATLAB平台上实现的FA优化方向图,该方向图与使用FA获得的同步序列相同,并进行了比较。
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引用次数: 3
Comparative analysis of single span high speed 40 Gbps long haul optical link using different modulation formats in the presence of Kerr nonlinearity 克尔非线性下不同调制格式的单跨高速40gbps长途光链路的比较分析
Pub Date : 2014-05-01 DOI: 10.1109/TECHSYM.2014.6807928
Ankit Patel, R. B. Patel, Kinjal A Mehta
Rapid increase of the data traffic in communication world has accelerated the development of high capacity long-haul optical links, and the main barrier across these links are the chromatic dispersion and various nonlinear effects. This paper examines the long distance optical link up to 4000 km in the presence of Kerr nonlinearity using various modulation formats using three dispersion compensation schemes at different transmission distances. Here comparative analysis is carried out for the 40 Gbps long haul optical link using carrier-suppressed return to zero (CSRZ), modified duo binary return to zero (MDRZ) and differential phase shift keying (DPSK) modulation formats. The effect of change in the input power and transmission distance is observed in terms of Q value, BER and eye opening of various formats. It is observed that the performance of the system is greatly deteriorated by the Chromatic Dispersion and DPSK modulation format comes out to be the best choice for the long distance transmission up to 4000 km and beyond. Also the pre, post and symmetrical analysis is also carried out for all three modulation formats and optimum results are achieved with the symmetric configuration.
通信世界中数据通信量的快速增长加速了大容量长途光链路的发展,而色散和各种非线性效应是这些链路的主要障碍。本文采用三种色散补偿方案,在不同的传输距离下,采用不同的调制格式,研究了克尔非线性存在下高达4000公里的长距离光链路。本文采用载波抑制归零(CSRZ)、修正双二进制归零(MDRZ)和差分相移键控(DPSK)调制格式对40gbps长途光链路进行了比较分析。从不同格式的Q值、误码率和开眼度方面观察输入功率和传输距离变化的影响。结果表明,色散大大降低了系统的性能,DPSK调制格式是4000公里及以上长距离传输的最佳选择。此外,还对所有三种调制格式进行了前后和对称分析,并在对称配置下获得了最佳结果。
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引用次数: 6
A simplified space vector PWM scheme for any N-level inverter 一个简化的空间矢量PWM方案,适用于任何n电平逆变器
Pub Date : 2014-05-01 DOI: 10.1109/TECHSYM.2014.6808042
P. M. Shereef, G. Shiny
A simplified space-vector pulse width modulation (SVPWM) scheme for any N-level inverter is presented. The method involves the conversion of space vector diagram of NN-level inverter to that of a 2-level inverter. 60° coordinate system is used to represent space vectors instead of using cartesian coordinate system. In 60° coordinate system only integer coordinates are involved. So the computational complexity is reduced. The proposed scheme is experimentally verified for a three level inverter realised by cascading two 2-level inverters.
提出了一种适用于任意n电平逆变器的简化空间矢量脉宽调制(SVPWM)方案。该方法将nn级逆变器的空间矢量图转换为2级逆变器的空间矢量图。用60°坐标系代替直角坐标系来表示空间矢量。在60°坐标系中,只涉及整数坐标。这样就降低了计算复杂度。实验验证了该方案在两个2电平逆变器级联实现的三电平逆变器上的有效性。
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引用次数: 2
Synthesis of ESOP-based reversible logic using negative polarity reed-muller form 利用负极性reed-muller形式合成基于esop的可逆逻辑
Pub Date : 2014-05-01 DOI: 10.1007/978-81-322-1817-3_36
Chandan Bandyopadhyay, S. Roy, L. Biswal, H. Rahaman
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引用次数: 2
FPGA based implementation & power analysis of parameterized Walsh sequences 基于FPGA的参数化Walsh序列实现及功耗分析
Pub Date : 2014-05-01 DOI: 10.1109/TECHSYM.2014.6808063
Gaurav Purohit, V. K. Chaubey, K. Raju, D. Vyas
This paper presents FPGA based implementation of the theory which replaces a general Sine and cosine function by set of orthogonal functions i.e. Walsh function. The paper further compares Parameterized `Serial In Serial Out' architectures based on classical counter approach. The investigation consider FPGA parameters like Area, Speed and Power and shows that using Gray-increment based architecture instead of Binary saves 6mW of power per symbol (64 Walsh chips per symbol) with 30% reduction in area. The design is implemented in VHDL code, simulated in MATLAB System Generator environment and validated with MATLAB Simulink Model. The design targeted Xilinx Virtex-5 “XC5VLX50T-1ff1136” FPGA device for the implementation and comparison. The design found their uses in many popular applications like Software Define Radio (SDR) including multiuser communications such as CDMA, WCDMA, VLSI testing, pattern recognition as well as image and signal processing.
本文提出了用一组正交函数即Walsh函数代替一般正弦余弦函数的FPGA实现理论。本文进一步比较了基于经典计数器方法的参数化“串行进串行出”体系结构。该研究考虑了FPGA的面积、速度和功耗等参数,结果表明,使用基于灰度增量的架构代替二进制,每个符号节省6mW的功耗(每个符号64个Walsh芯片),面积减少30%。用VHDL代码实现了该设计,在MATLAB System Generator环境中进行了仿真,并用MATLAB Simulink模型进行了验证。本设计针对赛灵思Virtex-5“XC5VLX50T-1ff1136”FPGA器件进行了实现和比较。该设计在许多流行的应用中得到了应用,如软件定义无线电(SDR),包括多用户通信,如CDMA, WCDMA, VLSI测试,模式识别以及图像和信号处理。
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引用次数: 3
A novel approach for image compression based on multi-level image thresholding using Shannon Entropy and Differential Evolution 基于Shannon熵和差分进化的多级图像阈值压缩新方法
Pub Date : 2014-05-01 DOI: 10.1109/TECHSYM.2014.6807914
S. Paul, B. Bandyopadhyay
Image compression is one of the most important step in image transmission and storage. Most of the state-of-art image compression techniques are spatial based. In this paper, a histogram based image compression technique is proposed based on multi-level image thresholding. The gray scale of the image is divided into crisp group of probabilistic partition. Shannon's Entropy is used to measure the randomness of the crisp grouping. The entropy function is maximized using a popular metaheuristic named Differential Evolution to reduce the computational time and standard deviation of optimized objective value. Some images from popular image database of UC Berkeley and CMU are used as benchmark images. Important image quality metrics-PSNR, WPSNR and storage size of the compressed image file are used for comparison and testing. Comparison of Shannon's entropy with Tsallis Entropy is also provided. Some specific applications of the proposed image compression algorithm are also pointed out.
图像压缩是图像传输和存储的重要步骤之一。大多数最新的图像压缩技术都是基于空间的。本文提出了一种基于多级图像阈值分割的直方图图像压缩技术。将图像的灰度划分为清晰的概率分组。香农熵用于度量脆分组的随机性。利用一种流行的元启发式差分进化方法最大化熵函数,以减少优化目标值的计算时间和标准差。从加州大学伯克利分校和CMU的常用图像数据库中选取一些图像作为基准图像。重要的图像质量指标- psnr, WPSNR和压缩图像文件的存储大小用于比较和测试。并将香农熵与萨利斯熵进行了比较。文中还指出了该算法的一些具体应用。
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引用次数: 46
An automated method for detecting systolic peaks from arterial blood pressure signals 一种从动脉血压信号中检测收缩压峰值的自动方法
Pub Date : 2014-05-01 DOI: 10.1109/TECHSYM.2014.6807911
Dandu Sriram Raju, M. Manikandan, Ramkumar Barathram
In this paper, we present an automatic method for determining time-location of systolic peak in arterial blood pressure (ABP) signals. The method consists of four major steps: Gaussian derivative filtering, nonlinear peak amplification, Gaussian derivative based peak finding scheme, and peak position adjustment procedure. The method is tested and validated using the standard MIT-BIR Polysomnographic database containing a wide range of ABP signals, artifacts and high-frequency noises. Our results demonstrate that the proposed method can achieve better peak detection performance while maintaining very small detection error rates for both clean and noisy ABP signals. The method achieves an average sensitivity of 99.89% and positive predictivity of 99.59% on test ABP datasets consisting of 67,125 beats. Unlike other existing methods, our method is quite straightforward and simple in the sense that it does not use search-back algorithms with secondary thresholds.
在本文中,我们提出了一种自动确定动脉血压(ABP)信号中收缩压峰值的时间定位方法。该方法包括四个主要步骤:高斯导数滤波、非线性峰值放大、基于高斯导数的寻峰方案和峰值位置调整。使用标准的MIT-BIR多导睡眠图数据库对该方法进行了测试和验证,该数据库包含广泛的ABP信号、伪影和高频噪声。我们的研究结果表明,该方法可以在保持非常小的检测错误率的同时,获得更好的峰值检测性能。该方法在67,125次心跳测试ABP数据集上的平均灵敏度为99.89%,阳性预测率为99.59%。与其他现有方法不同,我们的方法非常直接和简单,因为它不使用具有次要阈值的搜索回退算法。
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引用次数: 11
Video error concealment using Speeded Up Robust Features and affine transformation 基于加速鲁棒特征和仿射变换的视频错误隐藏
Pub Date : 2014-05-01 DOI: 10.1109/TECHSYM.2014.6807917
Aravind Ranjan, A. Midya, Jayasree Chakraborty, S. Sengupta
Error concealment techniques try to mitigate the effect of channel error, using spatially and/or temporally neighboring macroblocks. This paper proposes a novel method for temporal error concealment. The change from one frame to the next frame is modelled as an affine transformation and Speeded Up Robust Features (SURF) algorithm is used to find correspondence between present and past frame. The set of matching points between the two frames is used to find an affine transformation. Random Sample and Consensus (RANSAC) algorithm is used to effectively remove outliers. The past frame is then affine transformed using the transformation matrix obtained. Corrupted regions are concealed using Temporal Replacement (TR) in the current frame with the transformed past frame as reference. Experimental results established the efficacy of the proposed algorithm over other temporal error concealment scheme in terms of both objective and subjective measurements.
错误隐藏技术试图通过使用空间和/或时间上相邻的宏块来减轻信道错误的影响。提出了一种新的时间误差隐藏方法。从一帧到下一帧的变化被建模为仿射变换,并使用加速鲁棒特征(SURF)算法来寻找当前帧和过去帧之间的对应关系。利用两帧之间的匹配点集来求仿射变换。采用RANSAC (Random Sample and Consensus)算法有效地去除异常值。然后利用得到的变换矩阵对过去坐标系进行仿射变换。以变换后的过去帧为参考,在当前帧中使用时间替换(TR)来隐藏损坏的区域。实验结果表明,该算法在客观和主观测量方面都优于其他时间误差隐藏方案。
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引用次数: 1
A modified thinning strategy to handle junction point distortion for Bangla characters 一种改进的细化策略来处理孟加拉字的连接点失真
Pub Date : 2014-05-01 DOI: 10.1109/TECHSYM.2014.6807913
Soumyadeep Ghosh, Soumen Bag
Thinning which is an important preprocessing step for character recognition is often subject to several kinds of distortion. Junction point distortion is a major imperfection in thinned images especially for handwritten Indian scripts due to the presence of large number of complicated junctions in them. Such distortion does allow the optical character recognition (OCR) systems to exploit the properties of these junctions for character recognition. We present a novel methodology to reduce distortion at junction regions adjoining the matra for BangIa script. Our method uses geometric properties of the junctions to solve the problem. We have tested our approach on our own data set consisting of a variety of isolated handwritten character images by different writers and have got promising results.
细化是字符识别的一个重要预处理步骤,经常受到多种失真的影响。交叉点畸变是薄图像的主要缺陷,特别是手写的印度文字,由于其中存在大量复杂的交叉点。这种畸变确实允许光学字符识别(OCR)系统利用这些连接的特性进行字符识别。我们提出了一种新颖的方法来减少BangIa文字的连接区域的失真。我们的方法利用结点的几何特性来解决这个问题。我们已经在我们自己的数据集上测试了我们的方法,该数据集由不同作者的各种孤立的手写字符图像组成,并获得了令人鼓舞的结果。
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引用次数: 1
Double-fault tolerant architecture design for digital adder 数字加法器双容错结构设计
Pub Date : 2014-05-01 DOI: 10.1109/TECHSYM.2014.6807932
Atin Mukherjee, A. Dhar
In the era of deep sub-micron technology, probability of chip failure has been increased with increase in chip density. A system must be fault tolerant to decrease the failure rate and increase the reliability of it. Multiple faults can affect a system simultaneously and there is a trade-off between area overhead and number of faults tolerated. This paper presents fault tolerant architecture design for a ripple carry adder and a conditional sum adder as fast adder assuming single and double faults. The philosophy can be generalized for any other system which has structural regularity within it.
在深亚微米技术时代,芯片的失效概率随着芯片密度的增加而增加。系统必须具备容错能力,以降低故障率,提高系统的可靠性。多个故障可能同时影响系统,并且在区域开销和可容忍的故障数量之间存在权衡。本文提出了单故障和双故障情况下,纹波进位加法器和条件和加法器作为快速加法器的容错结构设计。这种哲学可以推广到任何其他具有结构规律性的系统。
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引用次数: 4
期刊
Proceedings of the 2014 IEEE Students' Technology Symposium
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