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2015 International Conference on Microwave, Optical and Communication Engineering (ICMOCE)最新文献

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Highly selective cavity based band pass filter using asymmetric double quadruplets 采用非对称双四联体的高选择性腔基带通滤波器
Mahadev Sarkar, R. Sivakumar, R. Manjunath
A compact design procedure and realization techniques of sharp rejection band pass filter with pre calculated feed position is reported in this paper. Two spatially symmetric quadruplets are used asymmetrically with space mapping technique to adjust transmission zeros for getting desired selectivity. External coupling bandwidths are analysed, calculated and plotted for different feed line widths. A set of design equation are proposed to calculate external coupling bandwidths from the physical dimensions of the feed strip. Inter resonator spacing is utilized in special way to enhance overall bandwidth of the filter.
本文报道了一种预先计算进给位置的强抑制带通滤波器的紧凑设计过程和实现技术。利用空间映射技术对两个空间对称的四联体进行非对称调整,以获得期望的选择性。对不同馈线宽度下的外部耦合带宽进行了分析、计算和绘制。从进给带的物理尺寸出发,提出了一套计算外耦合带宽的设计方程。通过特殊的方式利用谐振腔间的间距来提高滤波器的总带宽。
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引用次数: 3
Simulation based algorithm for tracking fish population in unconstrained underwater 基于仿真的无约束水下鱼群跟踪算法
Sumant Kumar Mohapatra, Sushil Kumar Mahapatra, Sakuntala Mahapatra, B. Swain
Tracking of object in underwater is a emerging idea. There are several type of approaches used for this but they have high computational complexity. But scientist needs to study fish populations underwater in different environmental conditions. In this paper we proposed a simple algorithm for tracking and detecting multi moving fishes. A huge number of fishes can be tracked by comparing its mean in the successive frame of the video. The obtained output states a measurement of the difference of two mean values. The object window contains the matrix of the intensity value. Then this value is transformed into a set of feature vector. Finally the above two set of features is compared in the successive frame for a good match to its nearest locality. The MatLab 8.0 simulation result shows that the proposed method is capable of accurately detecting with high detection rate as compared to existing approaches with noisy and dense environment.
水下目标跟踪是一个新兴的概念。有几种类型的方法用于此,但它们具有很高的计算复杂性。但科学家需要研究不同环境条件下水下的鱼类种群。本文提出了一种简单的多运动鱼类跟踪检测算法。通过在视频的连续帧中比较其平均值,可以跟踪大量的鱼类。得到的输出状态是对两个平均值之差的测量。对象窗口包含强度值的矩阵。然后将该值转换为一组特征向量。最后在连续的帧中比较上述两组特征,以获得与其最近位置的良好匹配。MatLab 8.0仿真结果表明,与现有的噪声和密集环境下的检测方法相比,该方法能够准确检测,检测率高。
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引用次数: 4
Resonance frequency formulation for planar rectangular monopole antenna 平面矩形单极天线的谐振频率公式
A. Deshmukh, A. Desai, S. Shaikh, K. Lele, S. Agrawal
Ultra-wide band response in planar monopole microstrip antenna is realized due to coupling between fundamental and higher order patch modes. In the reported literature, formulation in resonant length at fundamental and higher order modes of planar monopole patch is not given. In this paper, by studying the surface current distributions for planar monopole rectangular microstrip antenna, a formulation in resonant length at fundamental patch mode for different patch aspect ratio is presented. The frequencies calculated using the same closely agrees with the simulated results. Thus proposed formulations can be used to realize ultra-wide band planar monopole antenna from the desired frequency range.
平面单极微带天线的超宽带响应是通过基阶和高阶贴片模式的耦合实现的。在已有的文献中,没有给出平面单极贴片基阶和高阶模的谐振长度公式。本文通过对平面单极矩形微带天线表面电流分布的研究,给出了不同贴片宽高比下基片模式下的谐振长度表达式。计算得到的频率与模拟结果吻合较好。因此,所提出的公式可用于在所需频率范围内实现超宽带平面单极天线。
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引用次数: 0
Relaying networks with Nth Best-Relay Selection over Nakagami fading channel 中上衰落信道上n次最佳中继选择中继网络
S. Arunmozhi, G. Nagarajan
The coverage and spatial diversity enhancement in the wireless technology needs cooperative relaying strategy. Among a set of N relay elements, the Nth Best-Relay Selection scheme is proposed. The selection algorithm shows improvement in the bandwidth penalty and also increases the spatial diversity by employing a sub-optimal allocation considering the relay relative distance between the source and destination in a multi-hop cooperative systems. A single branch dual-hop network with adaptive Decode-and-forward (DF) and Amplify-and-forward(AF) cooperative diversity systems is considered. The analytical model of the proposed Nth Best-Relay selection scheme over single branch dual-hop system was developed and a closed-form expression was obtained. The BER (Bit error rate) and Outage probability using binary and quadrature phase shift keying modulation schemes (BPSK & QPSK) employing decode-and-forward (DF) and amplify-and-forward(AF) cooperative diversity systems over Nagakami fading channel was estimated. Results show that in the Nth best relay the diversity order is equal to (M - N + 2) where M is the number of relays.
无线技术的覆盖和空间分集增强需要协同中继策略。在一组N个中继单元中,提出了第N个最佳中继选择方案。在多跳合作系统中,考虑到源端和目的端中继之间的相对距离,采用次优分配,提高了空间分集,改善了带宽损失。研究了具有自适应译码转发(DF)和放大转发(AF)合作分集系统的单分支双跳网络。建立了单支路双跳系统第n次最佳中继选择方案的解析模型,得到了该方案的封闭表达式。估计了在Nagakami衰落信道上采用译码前向(DF)和放大前向(AF)合作分集系统的二进制和正交相移键控调制方案(BPSK & QPSK)的误码率和中断概率。结果表明,在第N个最佳继电器中,分集顺序为(M - N + 2),其中M为继电器个数。
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引用次数: 0
An experiment on MSTAR data for CFAR detection in lognormal and weibull distributed sar clutter 对数正态和威布尔分布sar杂波中MSTAR数据的CFAR检测实验
Dheeren Ku Mahapatra, Kumari Rosy Pradhan, L. P. Roy
In this paper, a constant false alarm rate (CFAR) target detection algorithm is presented. Here, lognormal and Weibull distributions are considered for modeling clutter amplitude of synthetic aperture radar(SAR) images. Then Kullback-Leibler (KL) goodness-of-fit test is employed to evaluate the histogram matching accuracy of estimated probability density functions (pdfs) of selected models with SAR clutter data histogram. With the use of appropriate background clutter model, CFAR detection algorithm is applied to moving and stationary target acquisition and recognition (MSTAR) data. Experimental results demonstrate that, accuracy of CFAR detector is more for Weibull clutter compared to the same for lognormal clutter.
本文提出了一种恒虚警率(CFAR)目标检测算法。本文考虑对数正态分布和威布尔分布对合成孔径雷达(SAR)图像的杂波振幅进行建模。然后利用Kullback-Leibler (KL)拟合优度检验对所选模型估计的概率密度函数(pdf)与SAR杂波数据直方图的匹配精度进行评价。利用合适的背景杂波模型,将CFAR检测算法应用于运动目标和静止目标的获取与识别(MSTAR)数据。实验结果表明,相对于对数正态杂波,CFAR检测器对威布尔杂波的检测精度更高。
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引用次数: 11
Design modeling and certain investigations of median filter 中值滤波器的设计、建模及若干研究
V. R. Malipatil, G. Patil
This paper proposes a detection and an estimation of pixels corrupted by impulse noise. A simple and efficient impulse detector known as Min-Max impulse detector (MMID) is utilized for impulse detection. The detector classifies the pixels into noisy and noise free based on the dynamic range of an image. A pixel is identified as noisy if its intensity value coincides with the minimum or maximum value of the dynamic range. The noisy pixels are restored using the median of noise free pixels and noise free pixels are retained as it is. The experimental analysis declares that MMID is good at identifying the pixels corrupted by fixed valued impulses and enhances the performance of a median filter.
提出了一种检测和估计被脉冲噪声损坏的像素的方法。一种简单高效的脉冲检测器称为最小-最大脉冲检测器(MMID),用于脉冲检测。检测器根据图像的动态范围将像素分为有噪声和无噪声。如果一个像素的强度值与动态范围的最小值或最大值一致,则该像素被识别为噪声。利用无噪声像素的中值恢复噪声像素,保持无噪声像素不变。实验分析表明,该方法能很好地识别被固定值脉冲破坏的像素,提高了中值滤波器的性能。
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引用次数: 0
A methodology for inter amplifier separation optimization in WDM systems 波分复用系统中放大器间分离优化方法
Jaskaranjit Kaur, Gurpreet Singh
Four Wave Mixing, Stimulated Raman Scattering and Amplified Spontaneous Emission Noise tend to belittle the advantages bestowed by WDM transmission link especially in a link containing inline amplifiers. The Non Linear effects have been related with the intensity and thus most of the work has been directed towards the study of input power to depreciate the limitations imposed by the Non Linearities. In this paper a methodology to decrease the combined effect of SRS, FWM and ASE Noise and to minimize the Bit Error Rate has been suggested by optimizing Inter Amplifier Separation for a 10 Gbps WDM system for link lengths up to 500 Kilometers using Simulation. Optimization of interamplifier separation improves the BER and thus the system length can be extended. Also the nature of ASE and FWM effects has been studied and it has been shown that the system performance is most affected by the FWM effect.
四波混频、受激拉曼散射和放大的自发发射噪声往往会削弱WDM传输链路所具有的优势,特别是在包含内联放大器的链路中。非线性效应与强度有关,因此大部分工作都是针对输入功率的研究,以降低非线性所施加的限制。本文提出了一种减少SRS、FWM和ASE噪声的综合影响并最小化误码率的方法,该方法通过仿真优化10gbps WDM系统的放大器间分离,链路长度可达500公里。优化放大器间分离可以提高误码率,从而延长系统长度。此外,本文还研究了分频效应和分频效应的性质,结果表明分频效应对系统性能的影响最大。
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引用次数: 1
Fast settling ultra low phase noise synthesizer for frequency agile RADARS 用于频率捷变雷达的快速沉降超低相位噪声合成器
T. Venkatmuni, C. Fouziya, Vikas Kumar, K. Murthy
Synthesizer phase noise and settling time of RADAR transmitter impacts performance of the radar system. Ability to detect moving-target signals superimposed with clutter depends on spectral purity level of the transmitter signal i.e. phase noise combined with other spurii. Lower the phase noise, stronger the ability to detect moving-target signals. Low time jitter/phase noise clock signals in receiver are enhances dynamic range by increasing SNR. Frequency agile RADARS works at higher bandwidths and narrow channel spacing with fast settling time. Combined PLL&DDS synthesizers and transistor multiplication methods are used for transmitter Local oscillator and Receiver clock signals generation respectively. This paper presents, generation of ultra low phase noise signals with fast settling time using minimum hardware. Measured results taken from in-house developed multi source synthesizer for frequency agile RADARS.
雷达发射机的合成器相位噪声和沉降时间影响雷达系统的性能。检测杂波叠加运动目标信号的能力取决于发射信号的光谱纯度,即相位噪声与其他杂波的结合。相位噪声较低,检测运动目标信号的能力较强。接收机中的低时间抖动/相位噪声时钟信号通过提高信噪比来增强动态范围。频率捷变雷达工作在较高的带宽和较窄的信道间隔下,具有快速的建立时间。用PLL&DDS合成器和晶体管倍增法分别产生发射机本振和接收机时钟信号。本文介绍了一种用最小的硬件产生快速稳定时间的超低相位噪声信号的方法。测量结果从内部开发的多源合成器的频率捷变雷达。
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引用次数: 2
Printed multiband monopole antenna for MIMO wireless applications 用于MIMO无线应用的印刷多波段单极天线
S. Khade, S. Badjate
A novel dual band monopole antenna suitable for Multiple Input Multiple Output (MIMO) system is proposed for next generation mobile communication. A simple F-shaped monopole antenna resonates at 2 frequency bands. The proposed antenna covers frequency bands including Wireless radio and Wi-MAX applications with reflection coefficient below -10 dB centred at 1.25 GHz and 5.8 GHz. A parasitic element is introduced in between the two antennas to reduce the mutual coupling between them and thus, enhance the isolation. The proposed antenna is simple to design and with good performance in terms of reflection coefficient, gain and isolation, VSWR.
提出了一种适用于下一代移动通信多输入多输出(MIMO)系统的新型双频单极天线。一个简单的f形单极天线在2个频段共振。该天线覆盖的频段包括以1.25 GHz和5.8 GHz为中心的反射系数低于-10 dB的无线无线电和Wi-MAX应用。在两个天线之间引入了寄生元件,以减少它们之间的相互耦合,从而增强隔离。该天线设计简单,在反射系数、增益、隔离度、驻波比等方面具有良好的性能。
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引用次数: 1
Automatic speech recognition based Odia system 基于Odia的自动语音识别系统
Biswajit Karan, Jayaprakash Sahoo, P. K. Sahu
In this paper, we presents a scheme of implementation of automatic speech recognition system using Odia language. The proposed system is realized using Kaldi toolkit for automatic recognition of district models of the state of Odisha. We investigate the monophone and triphone model for Odia speech recognition. Acoustic modeling of Odia speech recognition was performed using HMM and GMM. A significant reduction in word error rate (WER) was observed using the triphone model. We report the preliminary speech recognition results using Kaldi speech toolkit.
本文提出了一种基于Odia语言的语音自动识别系统的实现方案。该系统利用Kaldi工具实现了对奥里萨邦地区模型的自动识别。我们研究了用于Odia语音识别的单声道和三声道模型。利用HMM和GMM对Odia语音识别进行声学建模。使用三音器模型可以显著降低单词错误率(WER)。我们报告了使用Kaldi语音工具包的初步语音识别结果。
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引用次数: 12
期刊
2015 International Conference on Microwave, Optical and Communication Engineering (ICMOCE)
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