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2007 IEEE 15th Signal Processing and Communications Applications最新文献

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Performance Analysis of WIMAX (802.16e) Systems WIMAX (802.16e)系统性能分析
2007 IEEE 15th Signal Processing and Communications Applications Pub Date : 2007-06-11 DOI: 10.1109/SIU.2007.4298695
A. Safak, M. Ozdem, E. Uyanik
{"title":"Performance Analysis of WIMAX (802.16e) Systems","authors":"A. Safak, M. Ozdem, E. Uyanik","doi":"10.1109/SIU.2007.4298695","DOIUrl":"https://doi.org/10.1109/SIU.2007.4298695","url":null,"abstract":"The performance of WIMAX (IEEE 802.16e) systems can be improved by using adaptive antennas in the base stations. These systems operate in Rayleigh/Rician fading channels in the 2-6 GHz band for mobile users with velocities up to 125 km/hr. In this paper, adaptive antenna systems are employed in order to find the direction of arrival (DOA) of the signals and to maximize SINR by using beamforming, Capon, MUSIC and ESPRIT algorithms. The paper also presents the effects of modulation, coding, OFDM symbol duration and Doppler shift on the performance of WIMAX systems.","PeriodicalId":315147,"journal":{"name":"2007 IEEE 15th Signal Processing and Communications Applications","volume":"354 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115781398","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
The Effect of Temperature to the Performance of Coupled Bent Optical Waveguides 温度对耦合弯曲光波导性能的影响
2007 IEEE 15th Signal Processing and Communications Applications Pub Date : 2007-06-11 DOI: 10.1109/SIU.2007.4298822
N. O. Unverdi, N. A. Unverdi, C. Canbay
{"title":"The Effect of Temperature to the Performance of Coupled Bent Optical Waveguides","authors":"N. O. Unverdi, N. A. Unverdi, C. Canbay","doi":"10.1109/SIU.2007.4298822","DOIUrl":"https://doi.org/10.1109/SIU.2007.4298822","url":null,"abstract":"Optical fibers which are the basic elements of the optical communication technology, that progressed rapidly during the recent years, have become the key element in many industrial applications. In this study, coupled optical waveguides which are in use in many areas such as directional couplers, sensors, multiplexers, amplifiers and filters, were analyzed. The impact of temperature on the performance of circularly bent, bare, weakly guiding, lossless, multimode and slab optical waveguides was investigated. The coupling between pair TE modes was observed to be higher than the coupling between other modes. Coupled optical waveguides were analyzed in an ambient temperature of 100degC. The change in the modal propagation constant was observed to decrease as the ambient temperature increases.","PeriodicalId":315147,"journal":{"name":"2007 IEEE 15th Signal Processing and Communications Applications","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130252790","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
Hexahedral Mesh Smoothing by Means of Particle Swarm Optimization 基于粒子群优化的六面体网格平滑
2007 IEEE 15th Signal Processing and Communications Applications Pub Date : 2007-06-11 DOI: 10.1109/SIU.2007.4298804
A. Yilmaz, M. Kuzuoglu
{"title":"Hexahedral Mesh Smoothing by Means of Particle Swarm Optimization","authors":"A. Yilmaz, M. Kuzuoglu","doi":"10.1109/SIU.2007.4298804","DOIUrl":"https://doi.org/10.1109/SIU.2007.4298804","url":null,"abstract":"The main aim in this work is the smoothing and improvement of all-hexahedral mesh (especially created for the finite element method) by means of the particle swarm optimization (PSO) technique. The optimization is performed by using various objective functions derived from several hexehadral element quality metrics. The proposed method is tested over some problems encountered in the electromagnetic theory.","PeriodicalId":315147,"journal":{"name":"2007 IEEE 15th Signal Processing and Communications Applications","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133949218","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
Detection of Transformer Internal Faults by Using Independent Component Analysis 用独立分量分析法检测变压器内部故障
2007 IEEE 15th Signal Processing and Communications Applications Pub Date : 2007-06-11 DOI: 10.1109/SIU.2007.4298776
E. Kılıç, O. Ozgonenel
{"title":"Detection of Transformer Internal Faults by Using Independent Component Analysis","authors":"E. Kılıç, O. Ozgonenel","doi":"10.1109/SIU.2007.4298776","DOIUrl":"https://doi.org/10.1109/SIU.2007.4298776","url":null,"abstract":"In this work it is aimed to detect transformer internal fault and magnetizing inrush currents by using independent component analysis (ICA). A laboratory transformer is used for real-time experiments to examine the suggested technique. Laboratory experiments cover turn to turn faults performed in primary and secondary windings and inrush conditions. Differential (Id) and restraint (Ir) currents are analyzed by ICA and MATLABtrade is used for required calculations. Transformer internal faults can be detected effectively with the proposed method.","PeriodicalId":315147,"journal":{"name":"2007 IEEE 15th Signal Processing and Communications Applications","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134316920","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 Automated System for On-line Monitoring and Detection of ST Changes in ECG Signal 心电信号中ST线变化的自动在线监测与检测系统
2007 IEEE 15th Signal Processing and Communications Applications Pub Date : 2007-06-11 DOI: 10.1109/SIU.2007.4298788
M. Mohebbi, H. Moghadam, M. Teshnehlab
{"title":"An Automated System for On-line Monitoring and Detection of ST Changes in ECG Signal","authors":"M. Mohebbi, H. Moghadam, M. Teshnehlab","doi":"10.1109/SIU.2007.4298788","DOIUrl":"https://doi.org/10.1109/SIU.2007.4298788","url":null,"abstract":"In this paper, we present n new automated system for on-line monitoring and detection of ST changes in one channel electrocardiograms (ECG). This system consists of a preprocessing step for QRS detection, baseline wandering removal, and noise suppression. In the next step, the system uses a normal beat template as reference and a set of rules defined by cardiologists for detecting ischemic beats based on ST slope/deviation measurements. In the third step, the system uses a window classification for detecting sequences of ischemic beats. In the final step ischemic episodes in ECG signal are detected by merging sequences which are close together. Our system is advantageous with respect to similar algorithms; because it uses a template for rejecting abnormal ECG waveforms and accurate measurement of ST deviations. We have also modified some rules used by previous similar works in order to correspond better to the criteria used by cardiac specialists. A graphical user interface has been also developed for real time monitoring of the ST amplitude/slope along with the ECG signal. The performance of the system was evaluated using a subset of ESC ST-T database including 48 records. This evaluation demonstrated high sensitivity (94.5%) and good positive predictivity (85.03%) of our system.","PeriodicalId":315147,"journal":{"name":"2007 IEEE 15th Signal Processing and Communications Applications","volume":"138 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131825391","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: 6
Block Normalization Based Blind Detectors For Spread Spectrum Watermarking Systems 基于块归一化的扩频水印盲检测器
2007 IEEE 15th Signal Processing and Communications Applications Pub Date : 2007-06-11 DOI: 10.1109/SIU.2007.4298610
Ç. Karabat, M. Keskinoz
{"title":"Block Normalization Based Blind Detectors For Spread Spectrum Watermarking Systems","authors":"Ç. Karabat, M. Keskinoz","doi":"10.1109/SIU.2007.4298610","DOIUrl":"https://doi.org/10.1109/SIU.2007.4298610","url":null,"abstract":"In this paper, novel blind watermark detectors are presented lor spread spectrum watermarking systems. These detectors are based on the proposed block normalization method. The block normalization method reduces host signal interference by using the local statistics of each 8times8 discrete cosine transform block of the watermarked image. The simulation results show that the block normalization method considerably improves the bit error rate of the existing correlation, covariance and maximum likelihood estimation detectors.","PeriodicalId":315147,"journal":{"name":"2007 IEEE 15th Signal Processing and Communications Applications","volume":"56 98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132959092","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
Genetic Algorithm and Simulated Annealing for Dynamic OVSF Code Allocation in WCDMA Networks WCDMA网络中OVSF动态码分配的遗传算法和模拟退火
2007 IEEE 15th Signal Processing and Communications Applications Pub Date : 2007-06-11 DOI: 10.1109/SIU.2007.4298627
M. Karakoç, A. Kavak
{"title":"Genetic Algorithm and Simulated Annealing for Dynamic OVSF Code Allocation in WCDMA Networks","authors":"M. Karakoç, A. Kavak","doi":"10.1109/SIU.2007.4298627","DOIUrl":"https://doi.org/10.1109/SIU.2007.4298627","url":null,"abstract":"Orthogonal variable spreading factor (OVSF) codes are used to provide variable data rates for supporting different bandwidth requirements in wideband code division multiple access (WCDMA) systems. Unlike existent studies such as assign OVSF codes using conventional (CCA) or dynamic (DCA) code allocation algorithms, in this paper, genetic algorithm (GA) and simulated annealing (SA) algorithms were applied which population size is adaptively constructed according to existing traffic density in the OVSF code-tree. The simulation results show that the GA and SA provide reduced code blocking probability and improved spectral efficiency in the system when compared to the CCA and DCA schemes. Finally, the more system performance results the more computational load.","PeriodicalId":315147,"journal":{"name":"2007 IEEE 15th Signal Processing and Communications Applications","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132642187","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
Generalized Spectrum of Interpolants: Part I - Theory 插值的广义谱:第一部分-理论
2007 IEEE 15th Signal Processing and Communications Applications Pub Date : 2007-06-11 DOI: 10.1109/SIU.2007.4298756
A. Bhandari, N. V. Kalpakam
{"title":"Generalized Spectrum of Interpolants: Part I - Theory","authors":"A. Bhandari, N. V. Kalpakam","doi":"10.1109/SIU.2007.4298756","DOIUrl":"https://doi.org/10.1109/SIU.2007.4298756","url":null,"abstract":"In this paper, we propose a new theorem relating to the generalized spectrum of an interpolating function. In particular, our theorem provides an incite to design interpolants in frequency domain. We consider a more pragmatic situation where the reconstruction filter is non-ideal and occupies some extra bandwidth. The spectrum is shown to satisfy the orthogonality condition which the strongest constraint for the admissibility of an interpolant. Extending our formulation, we show that the spectrum of generating function (Sine) used in Shannon's sampling theorem is a special case of spectrum proposed in this paper.","PeriodicalId":315147,"journal":{"name":"2007 IEEE 15th Signal Processing and Communications Applications","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117296740","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
Ionospheric Total Electron Content Estimation Using IONOLAB Method 利用IONOLAB方法估算电离层总电子含量
2007 IEEE 15th Signal Processing and Communications Applications Pub Date : 2007-06-11 DOI: 10.1109/SIU.2007.4298565
H. Nayir, F. Arıkan, C. B. Erol, O. Arikan
{"title":"Ionospheric Total Electron Content Estimation Using IONOLAB Method","authors":"H. Nayir, F. Arıkan, C. B. Erol, O. Arikan","doi":"10.1109/SIU.2007.4298565","DOIUrl":"https://doi.org/10.1109/SIU.2007.4298565","url":null,"abstract":"Ionosphere which is an important atmospheric layer for HF and satellite communications, can be investigated through Total Electron Content (TEC). Global Positioning System provides cost-effective means for TEC estimation. Regularized TEC estimation method (D-TEI) is developed to estimate high resolution, robust TEC values. The method combines measurements of GPS satellites above 10° elevation limit and estimates can be obtained with 30 s time resolution. In this paper, parameters that are used in D-TEI method such as ionospheric height, weighting function, and satellite receiver biases are studied. It is found that TEC estimation results of D-TEI method is almost independent of ionospheric height. Different weighting functions are tried and the weighting function that minimizes non-ionospheric effects is selected. By using satellite and receiver biases in the correct form consistent TEC estimation results are obtained with IGS analysis centers. In this paper, the method is improved to include phase measurements. Taking either pseudorange or phase measurements as input, high resolution, robust TEC estimates are obtained using D-TEI method.","PeriodicalId":315147,"journal":{"name":"2007 IEEE 15th Signal Processing and Communications Applications","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128860666","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
Face Recognition by Using 3D Discrete Cosine Transform 基于三维离散余弦变换的人脸识别
2007 IEEE 15th Signal Processing and Communications Applications Pub Date : 2007-06-11 DOI: 10.1109/SIU.2007.4298616
G. Gunlu, H. Ş. Bilge
{"title":"Face Recognition by Using 3D Discrete Cosine Transform","authors":"G. Gunlu, H. Ş. Bilge","doi":"10.1109/SIU.2007.4298616","DOIUrl":"https://doi.org/10.1109/SIU.2007.4298616","url":null,"abstract":"In this study, a new method is presented for face recognition by using DCT-faces that are calculated by the 3 dimensional discrete cosine transform (3D DCT). In this method, firstly, face images in the database are collected on top of each other and then 3D DCT is applied to this 3D structure. Then 2D Inverse DCT of each coefficient layer is calculated separately. After this operation, DCT-faces are found which are very similar to eigenfaces. By taking the inner product between DCT-faces and original face images, feature vectors are calculated to be used in face recognition. Experimental results show that, the face recognition ratio of DCT-faces is close to that of eigenface method. Moreover, the proposed method has a lower time complexity and lower memory complexity.","PeriodicalId":315147,"journal":{"name":"2007 IEEE 15th Signal Processing and Communications Applications","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133763897","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
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