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A wide band envelope modulator for envelope tracking RF power amplifiers 用于包络跟踪射频功率放大器的宽带包络调制器
2013 21st Iranian Conference on Electrical Engineering (ICEE) Pub Date : 2013-05-14 DOI: 10.1109/IRANIANCEE.2013.6599829
A. Salimi, R. Dehghani, A. Nabavi
{"title":"A wide band envelope modulator for envelope tracking RF power amplifiers","authors":"A. Salimi, R. Dehghani, A. Nabavi","doi":"10.1109/IRANIANCEE.2013.6599829","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2013.6599829","url":null,"abstract":"Polar modulation RF power amplifier is a good candidate to enhance the efficiency while maintaining the linearity for high PAPR signals. Among different architecture used for envelope modulator, hybrid switching envelope modulator is attracted the attention. Class AB power amplifier which is the main block of hybrid switching envelope modulator should have wide bandwidth and low output impedance in a wideband of frequency to compensate high switching noise ripples. In this paper a wideband supply modulator with sufficient low output impedance is designed in 0.18 μm CMOS technology. The bandwidth of the modulator is around 437 MHz which is much larger than previously reported in literature. Thanks to the low output impedance of the class AB architecture, the HSEM architecture is capable of reducing the switching frequency noise up to 100MHz, while consuming approximately the same power as other architecture.","PeriodicalId":383315,"journal":{"name":"2013 21st Iranian Conference on Electrical Engineering (ICEE)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123227109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A new approach for designing robust adaptive fuzzy sliding mode controller 一种设计鲁棒自适应模糊滑模控制器的新方法
2013 21st Iranian Conference on Electrical Engineering (ICEE) Pub Date : 2013-05-14 DOI: 10.1109/IRANIANCEE.2013.6599584
S. Barghandan, M. Badamchizadeh
{"title":"A new approach for designing robust adaptive fuzzy sliding mode controller","authors":"S. Barghandan, M. Badamchizadeh","doi":"10.1109/IRANIANCEE.2013.6599584","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2013.6599584","url":null,"abstract":"In this paper a new method for Adaptive Fuzzy Sliding Mode Controller (AFSMC) is proposed for a Quadrotor helicopter and then this controller is developed by Parallel Fuzzy System (AFSMCP). Because oscillations in input signal and external disturbances, weights vector of fuzzy system may have unwanted changes and even it can be drifted to very large amounts. This event can eventuate chattering phenomenon in controlled signal and if there are un-modeled dynamics, it will even result instability in output of system. To eliminate of undesirable increases of weight vector while the adaptation law is being proceed, a parallel fuzzy system is used in addition of main fuzzy system. This fuzzy system controlled the speed and variation rate of main fuzzy system. In this technique, weights vector of main fuzzy system will be forced to follow the consequent weights vector of the parallel fuzzy system. The simulation results show effectiveness and robustness of proposed method.","PeriodicalId":383315,"journal":{"name":"2013 21st Iranian Conference on Electrical Engineering (ICEE)","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124683433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
High resolution tagging pattern in the polar coordinate system; A reconstruction based approach 极坐标系下的高分辨率标注模式;基于重构的方法
2013 21st Iranian Conference on Electrical Engineering (ICEE) Pub Date : 2013-05-14 DOI: 10.1109/IRANIANCEE.2013.6599757
A. Aghaeifar, N. Babaee, A. Moghaddam, A. Ayatollahi
{"title":"High resolution tagging pattern in the polar coordinate system; A reconstruction based approach","authors":"A. Aghaeifar, N. Babaee, A. Moghaddam, A. Ayatollahi","doi":"10.1109/IRANIANCEE.2013.6599757","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2013.6599757","url":null,"abstract":"The current gold standard for non-invasive assessment of the myocardium function is myocardium tissue tagging through cardiovascular magnetic resonance (CMR). Development of automatic tools for quantification of global and regional function of myocardium is currently an active research area and density of tag lines play a key role in this quantification. In this study we have introduced a novel framework to create high resolution tagged CMR images based on a modified reconstruction chain in MR systems. Results show a signification potential of this framework for real-time processing of the tagged CMR images for clinical applications.","PeriodicalId":383315,"journal":{"name":"2013 21st Iranian Conference on Electrical Engineering (ICEE)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121751052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An ultra-fast, optimized and massively-parallelized Curvelet transform algorithm on GP-GPUs 一种基于gp - gpu的超快速、优化和大规模并行化曲线变换算法
2013 21st Iranian Conference on Electrical Engineering (ICEE) Pub Date : 2013-05-14 DOI: 10.1109/IRANIANCEE.2013.6599843
Mohammad Motamedi, Sima Sobhieh, S. A. Motamedi, A. Rezaie
{"title":"An ultra-fast, optimized and massively-parallelized Curvelet transform algorithm on GP-GPUs","authors":"Mohammad Motamedi, Sima Sobhieh, S. A. Motamedi, A. Rezaie","doi":"10.1109/IRANIANCEE.2013.6599843","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2013.6599843","url":null,"abstract":"The Curvelet transform is among one of the most powerful time-frequency representations of an image. However, since it is not a fast algorithm it cannot be employed in most real-time and/or large scale applications. This paper proposes a novel algorithm to speed up the Curvelet transform by both optimizing it for repetitive Curvelet usage and by massive parallelization. In this parallel algorithm we have reconfigured the structure of the Curvelet algorithm in a parallel format suitable for implementation on the GP-GPU. Experimental results prove the proposed algorithm to be ultra-fast without loss of accuracy.","PeriodicalId":383315,"journal":{"name":"2013 21st Iranian Conference on Electrical Engineering (ICEE)","volume":"88 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126107197","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Effect of parasitic elements on spherical probe-fed antennas 寄生元件对球面探针馈电天线的影响
2013 21st Iranian Conference on Electrical Engineering (ICEE) Pub Date : 2013-05-14 DOI: 10.1109/IRANIANCEE.2013.6599589
J. Meiguni, M. Kamyab, A. Hosseinbeig
{"title":"Effect of parasitic elements on spherical probe-fed antennas","authors":"J. Meiguni, M. Kamyab, A. Hosseinbeig","doi":"10.1109/IRANIANCEE.2013.6599589","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2013.6599589","url":null,"abstract":"Theory and experiment of a spherical probe-fed conformal antenna with a parasitic element mounted on a spherical multilayer structure are presented in this paper. Linear Rao-Wilton-Glisson (RWG) triangular basis functions are applied in MPIE formulation. Current distributions on coaxial probe and conformal radiating elements are computed by using spatial domain Dyadic Green's Function (DGF) and its asymptotic approximation. A prototype of such an antenna is fabricated and tested. The effect of the parasitic element on the input impedance and radiation patterns of the antenna is investigated. It is shown that the antenna characteristics are improved significantly with the presence of the conducting parasitic element. Good agreement is achieved between the results obtained from the proposed methods and the measurement results.","PeriodicalId":383315,"journal":{"name":"2013 21st Iranian Conference on Electrical Engineering (ICEE)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126275593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
An economic study to investigate the impacts of energy policy changes on renewable contribution in power systems 一项经济研究，旨在调查能源政策变化对电力系统中可再生能源贡献的影响
2013 21st Iranian Conference on Electrical Engineering (ICEE) Pub Date : 2013-05-14 DOI: 10.1109/IRANIANCEE.2013.6599897
M. H. Amirioun, Hajir Pourbabak, A. Kazemi
{"title":"An economic study to investigate the impacts of energy policy changes on renewable contribution in power systems","authors":"M. H. Amirioun, Hajir Pourbabak, A. Kazemi","doi":"10.1109/IRANIANCEE.2013.6599897","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2013.6599897","url":null,"abstract":"This paper evaluates the effect of possible energy policy changes on multi-objective optimal design and planning of a hybrid energy system. The study was performed for a remote area near Esfarjan, a village located in Shahreza, Iran. In the main scenario, the current energy policy is examined, while the sensitivity analysis scenario applies the near future condition that is gradually taking place by reducing the energy subsidies. Simulations have been done on six different system configurations for the both scenarios considering the two mentioned policies for electricity price, fuel price and environmental issues. Results show that in sensitivity scenario, in contrast with the main scenario, the renewable-grid configuration is more economical than the grid-only dependent system, which in turn will result in more interest in investing on renewable resources. Finally, the energy modeling software for hybrid renewable energy systems, HOMER is used in this study.","PeriodicalId":383315,"journal":{"name":"2013 21st Iranian Conference on Electrical Engineering (ICEE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125702609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Ensemble-based classifiers for cancer classification using human tumor microarray data 利用人类肿瘤微阵列数据进行癌症分类的基于集成的分类器
2013 21st Iranian Conference on Electrical Engineering (ICEE) Pub Date : 2013-05-14 DOI: 10.1109/IRANIANCEE.2013.6599553
Argin Margoosian, J. Abouei
{"title":"Ensemble-based classifiers for cancer classification using human tumor microarray data","authors":"Argin Margoosian, J. Abouei","doi":"10.1109/IRANIANCEE.2013.6599553","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2013.6599553","url":null,"abstract":"In this paper, two cancer classification techniques based on multicategory microarray data sets are presented. Due to the high dimensionality of microarray data sets, choosing reliable feature selection and classification algorithms with a high degree of accuracy and a low complexity is a crucial task in bioinformatics. Toward this goal, this paper aims to maximize the cancer classification accuracy using two reliable ensemble-based classifiers namely the ensemble of naive bayes and the ensemble of k-nearest neighbor. Simulation results show that our classifiers have considerably better accuracy than some conventional classification techniques such as the Support Vector Machine (SVM) and artificial neural networks in the field of multicategory microarray cancer classification based on fourteen cancer data set. However, the run time of the introduced ensemble-based classifiers is longer when the schemes use whole features. To reduce the time complexity while preserving the same classification accuracy as before, we use the recursive feature elimination based on the multiple support vector machine classifier to select more informative genes before applying the ensemble-based classifiers. Numerical evaluations show at least 30% improvement in the classification accuracy of our schemes when compared to the SVM-one versus one rule. In addition, our schemes are much more robust to the feature elimination and display a high accuracy in the case of low number of features.","PeriodicalId":383315,"journal":{"name":"2013 21st Iranian Conference on Electrical Engineering (ICEE)","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129223477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
Performance of back-propagation and self organizing map neural equalizers for asymmetrically clipped optical OFDM 非对称裁剪光OFDM中反向传播和自组织映射神经均衡器的性能
2013 21st Iranian Conference on Electrical Engineering (ICEE) Pub Date : 2013-05-14 DOI: 10.1109/IRANIANCEE.2013.6599724
Farideh Javidi, H. Khoshbin
{"title":"Performance of back-propagation and self organizing map neural equalizers for asymmetrically clipped optical OFDM","authors":"Farideh Javidi, H. Khoshbin","doi":"10.1109/IRANIANCEE.2013.6599724","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2013.6599724","url":null,"abstract":"This paper evaluates the performance of back-propagation (BP) and self organizing map (SOM) equalizer for indoor asymmetrically clipped optical OFDM (ACO-OFDM) wireless systems. Although in OFDM, parallel transmission and cyclic prefix addition improve the communication efficiency, there is still performance degradation due to inter-symbol interference (ISI) in dispersive channels. Simulation results indicate that BP multilayer perceptron and SOM neural equalizers enhance the bit error rate performance of ACO-OFDM systems in diffused channels for high signal to noise ratio. Moreover, proposed BP and SOM equalization require only 0.05 and 0.005 percent of ACO-OFDM symbols for training in a sec respectively while in single-tap equalization channel state information is necessary at the receiver.","PeriodicalId":383315,"journal":{"name":"2013 21st Iranian Conference on Electrical Engineering (ICEE)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124526902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
A conceptual custom super-computer design for real-time simulation of human brain 用于实时模拟人脑的概念定制超级计算机设计
2013 21st Iranian Conference on Electrical Engineering (ICEE) Pub Date : 2013-05-14 DOI: 10.1109/IRANIANCEE.2013.6599755
Nasim Farahini, A. Hemani
{"title":"A conceptual custom super-computer design for real-time simulation of human brain","authors":"Nasim Farahini, A. Hemani","doi":"10.1109/IRANIANCEE.2013.6599755","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2013.6599755","url":null,"abstract":"In this paper, we introduce BRIC, a novel custom multi-chip digital computer architecture for simulating in realtime a model of human brain in form of a spiking Bayesian Confidence Propagation Neural Network (BCPNN). The design is conceptually dimensioned for available technology in 2015-2020 with the estimated size of a pizza box, consuming less than 3 kWs of power, delivering 800 Teraflops/sec (single precision multiply operation) and 30 TBs of memory. To the best of our knowledge, this will be the smallest and lowest power real-time brain simulation engine if manufactured. The silicon and computational efficiencies come from use of 3D memory stacking, innovation in algorithm and architectural customization. The chip will be programmable allowing experimentation with variants of the BCPNN brain model.","PeriodicalId":383315,"journal":{"name":"2013 21st Iranian Conference on Electrical Engineering (ICEE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130187964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
An efficient algorithm for lip detection in color face images 彩色人脸图像唇形检测的一种高效算法
2013 21st Iranian Conference on Electrical Engineering (ICEE) Pub Date : 2013-05-14 DOI: 10.1109/IRANIANCEE.2013.6599705
Behrooz Zali-Vargahan, H. Kalbkhani, M. Shayesteh
{"title":"An efficient algorithm for lip detection in color face images","authors":"Behrooz Zali-Vargahan, H. Kalbkhani, M. Shayesteh","doi":"10.1109/IRANIANCEE.2013.6599705","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2013.6599705","url":null,"abstract":"In this paper, we present a new algorithm for finding lip area in color face images. Lip detection is used in many applications such as face detection, lip reading, and speech recognition. Our algorithm selects proper color space and saturation component for better separation of skin pixels from lip pixels. We consider the lower half part of image. We propose a modified Lip-Map algorithm to find lip area. Then, we apply wavelet transform to reduce the effect of noise. Next, the location of lips is obtained by considering the variance of different segments of lip area. We extract lip pixels from skin pixels by Top-Hat transform and region growing algorithm. To evaluate the performance of the proposed algorithm, we use four databases named as CVL, IMM, GTAV, and CID, in which the size of face image and the rotation of face are variable. Experimental results demonstrate that the proposed algorithm has better performance than previously presented methods.","PeriodicalId":383315,"journal":{"name":"2013 21st Iranian Conference on Electrical Engineering (ICEE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115928230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
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