Pub Date : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686232
J. Jeedella, H. Ahamad, M. Al-Mualla, J. Noras
This paper presents a new design method for notch IIR filters. The designed filters offer better transient frequency response for a given number of samples when compared to zero and projection initialization. Fine-tuning the positions of the poles to maximize the 3dB bandwidth of the transient frequency response for a given number of samples achieves the improvement. Second order filters were successfully designed for processing different numbers of samples and their performances were studied by considering their frequency responses.
{"title":"Design and analysis of second order IIR notch filters with double frequency initialization","authors":"J. Jeedella, H. Ahamad, M. Al-Mualla, J. Noras","doi":"10.1109/IEEEGCC.2006.5686232","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686232","url":null,"abstract":"This paper presents a new design method for notch IIR filters. The designed filters offer better transient frequency response for a given number of samples when compared to zero and projection initialization. Fine-tuning the positions of the poles to maximize the 3dB bandwidth of the transient frequency response for a given number of samples achieves the improvement. Second order filters were successfully designed for processing different numbers of samples and their performances were studied by considering their frequency responses.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124456177","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}
Pub Date : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686238
H. K. Chaiel, M. H. Ali, Saad M Al-Shamary
The frequency synthesizer is the heart of any frequency hopping system. Recently, the direct digital synthesizer is considered as one of the most important type due to the high resolution capability. The switching time of the conventional direct digital is mainly depending on the number of bits of the accumulator and the main clock of the reference frequency. In this paper, a proposed direct digital synthesizer is designed to reduce the time needed to change the required frequency. Computer simulation tests are used to examine the proposed system. The results of these tests show that the switching time is equal to the time interval of the main clock frequency.
{"title":"Fast direct digital synthesizer","authors":"H. K. Chaiel, M. H. Ali, Saad M Al-Shamary","doi":"10.1109/IEEEGCC.2006.5686238","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686238","url":null,"abstract":"The frequency synthesizer is the heart of any frequency hopping system. Recently, the direct digital synthesizer is considered as one of the most important type due to the high resolution capability. The switching time of the conventional direct digital is mainly depending on the number of bits of the accumulator and the main clock of the reference frequency. In this paper, a proposed direct digital synthesizer is designed to reduce the time needed to change the required frequency. Computer simulation tests are used to examine the proposed system. The results of these tests show that the switching time is equal to the time interval of the main clock frequency.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"98 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122375821","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}
Pub Date : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686256
F. F. Al-azzawi, E. Ahmed
Frequency hopped Orthogonal Frequency Division Multiple Access (FH-OFDMA) is considered as one of the hybrid CDMA-OFDM systems. Data is transmitted through multiple access system which adopt set of frequencies on which signal can hopped. Extending Quadratic Congruence (EQC) orthogonal hopping code is used to provide a protection against multi-user interference (MUI) and extremely generated interfering (jamming) signals with finite power, whether the system is suffering from fading or not.
{"title":"Effect of multi-tone jamming on FH-OFDMA system with orthogonal hopping patterns","authors":"F. F. Al-azzawi, E. Ahmed","doi":"10.1109/IEEEGCC.2006.5686256","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686256","url":null,"abstract":"Frequency hopped Orthogonal Frequency Division Multiple Access (FH-OFDMA) is considered as one of the hybrid CDMA-OFDM systems. Data is transmitted through multiple access system which adopt set of frequencies on which signal can hopped. Extending Quadratic Congruence (EQC) orthogonal hopping code is used to provide a protection against multi-user interference (MUI) and extremely generated interfering (jamming) signals with finite power, whether the system is suffering from fading or not.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123493451","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}
Pub Date : 2005-03-13DOI: 10.1109/IEEEGCC.2006.5686196
B. Bahmani, M. Jahromi, A. Ranjbar
To avoid the needless trip by magnetizing inrush current, the second harmonic component is commonly used for blocking differential relay in power transformers. However, the main problems of the current comparison method are in the very high inrush currents and relatively small fault currents regarding winding short circuits. Also The second harmonic component in fault current is increased in long lines which may blocks the relay operation. This paper describes a method to discriminate internal fault from inrush current and faults with a high second harmonic component by the sum of active power flowing into the transformer from each terminal. The average power is almost negligible for energizing, but an internal fault consumes large amounts of power.
{"title":"Optimizing the operation of current differential protection by power differential relay for three phase transformer","authors":"B. Bahmani, M. Jahromi, A. Ranjbar","doi":"10.1109/IEEEGCC.2006.5686196","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686196","url":null,"abstract":"To avoid the needless trip by magnetizing inrush current, the second harmonic component is commonly used for blocking differential relay in power transformers. However, the main problems of the current comparison method are in the very high inrush currents and relatively small fault currents regarding winding short circuits. Also The second harmonic component in fault current is increased in long lines which may blocks the relay operation. This paper describes a method to discriminate internal fault from inrush current and faults with a high second harmonic component by the sum of active power flowing into the transformer from each terminal. The average power is almost negligible for energizing, but an internal fault consumes large amounts of power.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133867690","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}
Pub Date : 1900-01-01DOI: 10.1109/ieeegcc.2006.5686173
The document that should appear here is not currently available.
这里应该出现的文档目前不可用。
{"title":"Application of hybrid genetic algorithms to design optimal radial network","authors":"","doi":"10.1109/ieeegcc.2006.5686173","DOIUrl":"https://doi.org/10.1109/ieeegcc.2006.5686173","url":null,"abstract":"The document that should appear here is not currently available.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133047730","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}
Pub Date : 1900-01-01DOI: 10.1109/ieeegcc.2006.5686212
The document that should appear here is not currently available.
这里应该出现的文档目前不可用。
{"title":"SMS-based payment system for e-commerce","authors":"","doi":"10.1109/ieeegcc.2006.5686212","DOIUrl":"https://doi.org/10.1109/ieeegcc.2006.5686212","url":null,"abstract":"The document that should appear here is not currently available.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126676334","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}
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