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2015 23rd Iranian Conference on Electrical Engineering最新文献

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Performance analysis of one-way relay networks with channel estimation errors and loop-back interference 有信道估计误差和环路干扰的单向中继网络性能分析
2015 23rd Iranian Conference on Electrical Engineering Pub Date : 2015-05-10 DOI: 10.1109/IRANIANCEE.2015.7146254
Mostafa Pashazadeh, F. Tabataba
{"title":"Performance analysis of one-way relay networks with channel estimation errors and loop-back interference","authors":"Mostafa Pashazadeh, F. Tabataba","doi":"10.1109/IRANIANCEE.2015.7146254","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2015.7146254","url":null,"abstract":"In this paper, we derive capacity cut-set bounds of half-duplex (HD) and full-duplex (FD) single relay systems in the presence of channel estimation errors and loop-back interference. Next, we propose power allocation technique to maximize the capacity upper bound that is shown to be effective and close to optimum solution. Comparison between FD and HD relaying systems using optimum power allocation is carried out. Simulation results show that depending on SNR values, it is better to tolerate some loop-back interference with the FD relaying rather than to consume channel resources in HD one. In addition, the estimation error effect is more destructive for low power. While, by increasing the transmitted power, the loop-back interference noise dominates the channel estimation error.","PeriodicalId":187121,"journal":{"name":"2015 23rd Iranian Conference on Electrical Engineering","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114337498","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
Low complexity adaptive LR-MMSE MIMO detector for joint transmission scenarios 面向联合传输场景的低复杂度自适应LR-MMSE MIMO检测器
2015 23rd Iranian Conference on Electrical Engineering Pub Date : 2015-05-10 DOI: 10.1109/IRANIANCEE.2015.7146444
Sayed Rasool Faraji, S. M. Fakhraie, S. Sheikhaei
{"title":"Low complexity adaptive LR-MMSE MIMO detector for joint transmission scenarios","authors":"Sayed Rasool Faraji, S. M. Fakhraie, S. Sheikhaei","doi":"10.1109/IRANIANCEE.2015.7146444","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2015.7146444","url":null,"abstract":"In cellular mobile networks, the performance of cell-edge users is limited by high interference signal from neighboring cells. Recently, in modern cellular communication systems, such as LTE-Advanced, the Coordinated Multi-Point Transmission technology is considered to improve the cell-edge users performance. In downlink of a CoMP scenario, the joint transmission can significantly reduce the interference. In this technique, the data signal is jointly transmitted from multiple-cell to the user equipment. However, in this technique the statistical properties of MIMO channel from the cells to the user affect the performance of MIMO detector, which can be expressed by the condition number. This paper presents an analysis of condition number of multiple MIMO channel in joint transmission scenario and proposes a low complexity adaptive LR-MMSE MIMO detection scheme. The computational complexity of proposed detection scheme is reduced by more than 36.5% in comparison to conventional LR-aided detector, while its performance is close to the performance of conventional LR-aided MIMO detector.","PeriodicalId":187121,"journal":{"name":"2015 23rd Iranian Conference on Electrical Engineering","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114476483","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 real-time voltage stability index based on local measurements 基于局部测量的实时电压稳定指标
2015 23rd Iranian Conference on Electrical Engineering Pub Date : 2015-05-10 DOI: 10.1109/IRANIANCEE.2015.7146456
Bahram Shakerighadi, F. Aminifar, S. Afsharnia
{"title":"A real-time voltage stability index based on local measurements","authors":"Bahram Shakerighadi, F. Aminifar, S. Afsharnia","doi":"10.1109/IRANIANCEE.2015.7146456","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2015.7146456","url":null,"abstract":"Existing techniques exploiting local measurements to calculate the long-term voltage stability mostly rely on Thevenin equivalent concept. This notion calls for two or more distinct measurement sets for computation of Thevenin parameters assuming that the power system stays unchanged during the data collection, which is not essentially true. This paper presents a new method for computation of voltage stability margin associated with system load buses using voltage and current magnitudes. The proposed method is independent from the system variations; thus, it does not suffer from the shortcoming of regular Thevenin equivalent method. The new methodology is based on this observation that in the stable region of voltage stability curve, the normalized absolute value of the rate of change of voltage magnitude is greater than that of the current magnitude. This observation is supported by the theoretical analysis as well. To demonstrate performance of the developed method, a simple radial network and the IEEE 14-bus test system are examined.","PeriodicalId":187121,"journal":{"name":"2015 23rd Iranian Conference on Electrical Engineering","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114886609","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
MIMO filter-bank multicarrier system using unique word OFDM MIMO滤波器组多载波系统使用唯一字OFDM
2015 23rd Iranian Conference on Electrical Engineering Pub Date : 2015-05-10 DOI: 10.1109/IRANIANCEE.2015.7146263
Z. Mohammadi, H. Zamiri-Jafarian
{"title":"MIMO filter-bank multicarrier system using unique word OFDM","authors":"Z. Mohammadi, H. Zamiri-Jafarian","doi":"10.1109/IRANIANCEE.2015.7146263","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2015.7146263","url":null,"abstract":"Orthogonal frequency division multiplexing (OFDM) multicarrier system is one of the most common approaches to overcome the frequency-selectivity of channels. When impulse response of channel is long the spectral efficiency of OFDM becomes very low due to using cyclic prefix (CP). Another multicarrier system, which achieves high spectral efficiency, is based on using filter-bank (FB). However, due to using real symbols in OFDM/OQAM, which is high spectral efficient FB-based system, it is not suitable for multiple-input multiple-output (MIMO) techniques in which complex symbols are employed. In this paper, we proposed a new multicarrier system, in which FB and unique word OFDM (UW-OFDM) techniques are combined together; call FB-UW-OFDM. Since complex symbols are used in the FB-UW-OFDM system, the space-time coding scheme can be employed. The proposed system is following the approach of [1] (we call it FB-CP-OFDM) in which CP-OFDM techniques has been used instead of UW-OFDM. Although the FB-UW-OFDM system has the same bandwidth efficiency of FB-CP-OFDM, as computer simulation shows, it has better performance. Moreover, employing UW-OFDM provides the possibility of channel estimation and synchronization due to using a deterministic unique word in FB-UW-OFDM system.","PeriodicalId":187121,"journal":{"name":"2015 23rd Iranian Conference on Electrical Engineering","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114684737","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
Polynomial-based compressing and iterative expanding for PAPR reduction in GFDM 基于多项式压缩和迭代展开的GFDM中PAPR减小方法
2015 23rd Iranian Conference on Electrical Engineering Pub Date : 2015-05-10 DOI: 10.1109/IRANIANCEE.2015.7146271
Z. Sharifian, M. Omidi, Arman Farhang, Hamid Saeedi‐Sourck
{"title":"Polynomial-based compressing and iterative expanding for PAPR reduction in GFDM","authors":"Z. Sharifian, M. Omidi, Arman Farhang, Hamid Saeedi‐Sourck","doi":"10.1109/IRANIANCEE.2015.7146271","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2015.7146271","url":null,"abstract":"GFDM (generalized frequency division multiplexing) is a non-orthogonal waveform that is being discussed as a candidate for the fifth generation of wireless communication systems (5G). GFDM is a multicarrier technique with circular pulse shaping that is designed in a way to address emerging applications in 5G networks such as Internet of Things (IoT) and machine-to-machine communications (M2M). The same as other multicarrier systems, GFDM suffers from a high peak to average power ratio (PAPR). To attack PAPR problem, in this paper, we propose a polynomial based companding method with iterative expansion that is called polynomial-based companding technique (PCT). Based on our simulation results, a great amount of PAPR reduction can be achieved through utilization of our proposed technique. Through simulations, we have also investigated the bit error rate (BER) performance of the system while adopting our PCT method. Our simulations reveal that there is a tradeoff between PAPR reduction and BER performance.","PeriodicalId":187121,"journal":{"name":"2015 23rd Iranian Conference on Electrical Engineering","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117208403","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: 32
Design and implementation of smith predictor based fractional order PID controller on MIMO flow-level plant 基于smith预测器的分数阶PID控制器的设计与实现
2015 23rd Iranian Conference on Electrical Engineering Pub Date : 2015-05-10 DOI: 10.1109/IRANIANCEE.2015.7146332
Roohallah Azarmi, A. Sedigh, Mahsan Tavakoli‐Kakhki, A. Fatehi
{"title":"Design and implementation of smith predictor based fractional order PID controller on MIMO flow-level plant","authors":"Roohallah Azarmi, A. Sedigh, Mahsan Tavakoli‐Kakhki, A. Fatehi","doi":"10.1109/IRANIANCEE.2015.7146332","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2015.7146332","url":null,"abstract":"The main point of this paper is to present an iterative optimization strategy for tuning the parameters of Smith predictor based fractional order PID (SPFOPID) controller. The control scheme considered in this paper is the standard Smith predictor structure. Also, the internal model is considered to be a First Order Plus Dead Time (FOPDT) transfer function. Finally, the proposed method is implemented on a multi input-multi output (MIMO) flow-level plant and the obtained results are compared with the results of applying Smith predictor based PID controller (SPPID) in the similar structure.","PeriodicalId":187121,"journal":{"name":"2015 23rd Iranian Conference on Electrical Engineering","volume":"146 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124692600","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: 14
Robust image watermarking by multi resolution embedding in wavelet transform coefficients 小波变换系数多分辨率嵌入鲁棒图像水印
2015 23rd Iranian Conference on Electrical Engineering Pub Date : 2015-05-10 DOI: 10.1109/IRANIANCEE.2015.7146262
M. Jamali, S. Samavi, N. Karimi
{"title":"Robust image watermarking by multi resolution embedding in wavelet transform coefficients","authors":"M. Jamali, S. Samavi, N. Karimi","doi":"10.1109/IRANIANCEE.2015.7146262","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2015.7146262","url":null,"abstract":"Deployment of multimedia content has increased the necessity of copyright protection by means of watermarking. Imperceptibility and robustness are two major features of the watermarking algorithms. Different methods tried to satisfy the tradeoff between these characteristics. Recently watermarking methods in wavelet and Discrete Cosine Transform domains have displayed favorable results. In this paper we present a new method for embedding and extracting watermarks in wavelet and Discrete Cosine Transform domains. We used block based redundant embedding and voting is used in the extraction phase. Experimental results show the efficiency of the proposed method and better results are obtained as compared to comparable methods with same size of watermark logo.","PeriodicalId":187121,"journal":{"name":"2015 23rd Iranian Conference on Electrical Engineering","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128263916","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
A symmetric CMOS inverter using biaxially strained Si nano PMOSFET 采用双轴应变硅纳米PMOSFET的对称CMOS逆变器
2015 23rd Iranian Conference on Electrical Engineering Pub Date : 2015-05-10 DOI: 10.1109/IRANIANCEE.2015.7146413
M. Khatami, M. Shalchian, M. Kolahdouz
{"title":"A symmetric CMOS inverter using biaxially strained Si nano PMOSFET","authors":"M. Khatami, M. Shalchian, M. Kolahdouz","doi":"10.1109/IRANIANCEE.2015.7146413","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2015.7146413","url":null,"abstract":"Typical CMOS inverters suffer from current mismatch of PMOS and NMOS transistors which causes asymmetric behavior of the static CMOS inverter. This mismatch is a result of non-equality of several parameters including mobility and threshold voltage of the PMOSFET and NMOSFET. In this paper we proposed a biaxially strained Si PMOSFET to reduce this mismatch. Also we have studied the parasitic channel in the biaxially strained Si PMOS and proposed a novel approach to eliminate this parasitic channel by increasing SiGe virtual substrate doping. Then the improved device has been used in the CMOS inverter which results in a symmetric output behavior with almost equal tPHL and tPLH of 52 ps and 50 ps, high noise margin (NMH) and low noise margin (NML) of 0.16 V and 0.18 V.","PeriodicalId":187121,"journal":{"name":"2015 23rd Iranian Conference on Electrical Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129368878","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
Expanding 2D block method in two direction by a new formula in EIT 用一种新的公式将二维块法在两个方向上展开
2015 23rd Iranian Conference on Electrical Engineering Pub Date : 2015-05-10 DOI: 10.1109/IRANIANCEE.2015.7146196
Saeed Zaravi, R. Amirfattahi, B. Vahdat
{"title":"Expanding 2D block method in two direction by a new formula in EIT","authors":"Saeed Zaravi, R. Amirfattahi, B. Vahdat","doi":"10.1109/IRANIANCEE.2015.7146196","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2015.7146196","url":null,"abstract":"Block method (BM) is a fast and new approach to solve forward and inverse problems in Electrical Impedance Tomography (EIT). In this method, a tissue is modeled by some blocks at first in which each block has a uniform conductivity. Then, a medical image is created by calculation of these conductivities. Recently a noniterative linear inverse solution is introduced for BM which we call it 2D BM. In this paper, an efficient algorithm called 2D expanded block method (2D EBM) is suggested by a new formulation to improve 2D BM. To examine 2D EBM and 2D BM, several examples have been studied. Results show that the proposed algorithm could achieve superior outcomes in comparison with 2D BM.","PeriodicalId":187121,"journal":{"name":"2015 23rd Iranian Conference on Electrical Engineering","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132083185","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: 1
Finite-time convergence of guidance system via fast terminal sliding mode control 快速末端滑模控制制导系统的有限时间收敛性
2015 23rd Iranian Conference on Electrical Engineering Pub Date : 2015-05-10 DOI: 10.1109/IRANIANCEE.2015.7146339
M. Golestani, A. Vali, Saeid Najjari, I. Mohammadzaman
{"title":"Finite-time convergence of guidance system via fast terminal sliding mode control","authors":"M. Golestani, A. Vali, Saeid Najjari, I. Mohammadzaman","doi":"10.1109/IRANIANCEE.2015.7146339","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2015.7146339","url":null,"abstract":"In this paper, a new nonlinear guidance law is proposed using a novel form of terminal sliding mode called “fast terminal sliding mode”. The system's states are also divided into two parts with respect to their required stabilization properties and only one part is forced to converge to zero. The faster the line-of-sight angular rate converges to zero, the more stability margin is obtained. Therefore, the resulting guidance law is able to nullify the line-of-sight angular rate in finite time. The finite time convergence property and robustness of the proposed law is also proved using extended Lyapunov stability theorem. Moreover, the control loop dynamics are considered as a first order differential equation due to their significant contribution to stability of the guidance system. Simulation results verify the better performance of the proposed law compared with conventional terminal sliding mode guidance law.","PeriodicalId":187121,"journal":{"name":"2015 23rd Iranian Conference on Electrical Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131683652","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: 1
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