Pub Date : 2008-04-22DOI: 10.1109/ICACT.2008.4493703
Min-Sung Hur, Jin-Yong Choi, Jong-seob Baek, Jongsoo Seo
A normalized-least-mean-square (NLMS) algorithm is used to adapt to an unknown system by minimizing the error between the desired signal and the signal resulting from the adaptive filter. A small positive constant value is used to ameliorate the problem of its diverging when the input power is small. Moreover, it can be a variable, where generalized normalized gradient descent (GNGD) algorithm can be used to update the value based on the a priori error. The steady-state mean square error (SSMSE) performance of the algorithm is expected to improve by using a posteriori error instead of the a priori error. In this paper, a GNGD algorithm based on estimated a posteriori error is derived for use in coefficient update using NLMS algorithm. With simulation results, it is shown that using a posteriori error for updating the small constant value within channel equalizer coefficient update process decreases the algorithm's SSMSE performance sensitivity to varying initial step size.
{"title":"Generalized Normalized Gradient Descent Algorithm Based on Estimated a Posteriori Error","authors":"Min-Sung Hur, Jin-Yong Choi, Jong-seob Baek, Jongsoo Seo","doi":"10.1109/ICACT.2008.4493703","DOIUrl":"https://doi.org/10.1109/ICACT.2008.4493703","url":null,"abstract":"A normalized-least-mean-square (NLMS) algorithm is used to adapt to an unknown system by minimizing the error between the desired signal and the signal resulting from the adaptive filter. A small positive constant value is used to ameliorate the problem of its diverging when the input power is small. Moreover, it can be a variable, where generalized normalized gradient descent (GNGD) algorithm can be used to update the value based on the a priori error. The steady-state mean square error (SSMSE) performance of the algorithm is expected to improve by using a posteriori error instead of the a priori error. In this paper, a GNGD algorithm based on estimated a posteriori error is derived for use in coefficient update using NLMS algorithm. With simulation results, it is shown that using a posteriori error for updating the small constant value within channel equalizer coefficient update process decreases the algorithm's SSMSE performance sensitivity to varying initial step size.","PeriodicalId":448615,"journal":{"name":"2008 10th International Conference on Advanced Communication Technology","volume":"67 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124787670","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 : 2008-04-22DOI: 10.1109/ICACT.2008.4493830
Seokjin Hong, Jaewon Lee, Jaehoon Choi
Two elements diversity planar antenna for a multiple-input multiple-output application is proposed. By adopting two Y-shaped radiators, the antenna provides wideband impedance matching characteristic over the desired frequency band. To reduce the mutual coupling between two radiating elements, three stubs are inserted in the ground plane. Good impedance matching and improved isolation characteristics are observed. The measured impedance bandwidth of the proposed antenna ranges from 2.27 GHz to 10.2 GHz for return loss less than 10 dB. Parametric analysis has been conducted to investigate the effect of radiator length and insertion of stubs on the impedance bandwidth and isolation characteristics.
{"title":"Design of UWB Diversity Antenna for PDA Applications","authors":"Seokjin Hong, Jaewon Lee, Jaehoon Choi","doi":"10.1109/ICACT.2008.4493830","DOIUrl":"https://doi.org/10.1109/ICACT.2008.4493830","url":null,"abstract":"Two elements diversity planar antenna for a multiple-input multiple-output application is proposed. By adopting two Y-shaped radiators, the antenna provides wideband impedance matching characteristic over the desired frequency band. To reduce the mutual coupling between two radiating elements, three stubs are inserted in the ground plane. Good impedance matching and improved isolation characteristics are observed. The measured impedance bandwidth of the proposed antenna ranges from 2.27 GHz to 10.2 GHz for return loss less than 10 dB. Parametric analysis has been conducted to investigate the effect of radiator length and insertion of stubs on the impedance bandwidth and isolation characteristics.","PeriodicalId":448615,"journal":{"name":"2008 10th International Conference on Advanced Communication Technology","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125445177","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 : 2008-04-22DOI: 10.1109/ICACT.2008.4494142
R. Yamamoto, F. Iseki, M. Kim
This paper propose an example of FMC based on IMS. Then the outline of the VoIP system which has been experimentally developed for the university network based on the proposed FMC is described.
本文提出了一个基于IMS的FMC实例。然后介绍了基于FMC的大学网络VoIP系统的实验开发概况。
{"title":"Validation of VoIP System for University Network","authors":"R. Yamamoto, F. Iseki, M. Kim","doi":"10.1109/ICACT.2008.4494142","DOIUrl":"https://doi.org/10.1109/ICACT.2008.4494142","url":null,"abstract":"This paper propose an example of FMC based on IMS. Then the outline of the VoIP system which has been experimentally developed for the university network based on the proposed FMC is described.","PeriodicalId":448615,"journal":{"name":"2008 10th International Conference on Advanced Communication Technology","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128490603","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 : 2008-04-22DOI: 10.1109/ICACT.2008.4493866
M. Shin, Yong-Woon Kim
The Internet with the runner of the global network is being currently used with an existence for over 30 years, since the Internet was proposed for the first time in 1974. But, recently, as many problems and limitations on the current Internet have been reported and figured out, the Future Network research based on "Clean Slate design" method is actively progressed. In the paper, we discuss new challenges on Future Network and summarize current standardization activities in ITU-T and ISO/IEC JTC1/SC6. Firstly the background and problems of the current Network are looked into with the research background. The requirement and design objective for the Future Network will be discussed. In addition, we present the analysis results about gap between other new standard technologies, such as NGN, IPv6, etc.
{"title":"New Challenges on Future Network and Standardization","authors":"M. Shin, Yong-Woon Kim","doi":"10.1109/ICACT.2008.4493866","DOIUrl":"https://doi.org/10.1109/ICACT.2008.4493866","url":null,"abstract":"The Internet with the runner of the global network is being currently used with an existence for over 30 years, since the Internet was proposed for the first time in 1974. But, recently, as many problems and limitations on the current Internet have been reported and figured out, the Future Network research based on \"Clean Slate design\" method is actively progressed. In the paper, we discuss new challenges on Future Network and summarize current standardization activities in ITU-T and ISO/IEC JTC1/SC6. Firstly the background and problems of the current Network are looked into with the research background. The requirement and design objective for the Future Network will be discussed. In addition, we present the analysis results about gap between other new standard technologies, such as NGN, IPv6, etc.","PeriodicalId":448615,"journal":{"name":"2008 10th International Conference on Advanced Communication Technology","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128446530","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 : 2008-04-22DOI: 10.1109/ICACT.2008.4493945
Sanghun Kim, Seungsoo Yoo, Seungsoo Yoo, Sun Yong Kim, Seokho Yoon
Binary offset carrier (BOC) signal synchronization is based on the correlation between the received and locally generated BOC signals. Thus, the multiple side-peaks in BOC autocorrelation are one of the main error sources in synchronizing BOC signals. Recently, a new correlation function with no side-peaks was proposed for sine or cosine phased BOC signal synchronization by the authors [7]. In this paper, we propose a novel correlation function for composite binary offset carrier (CBOC) signals by using the similar method to that in [7], which has a better power ratio than the CBOC autocorrelation.
{"title":"New Correlation Functions for CBOC Satellite Signal Synchronization","authors":"Sanghun Kim, Seungsoo Yoo, Seungsoo Yoo, Sun Yong Kim, Seokho Yoon","doi":"10.1109/ICACT.2008.4493945","DOIUrl":"https://doi.org/10.1109/ICACT.2008.4493945","url":null,"abstract":"Binary offset carrier (BOC) signal synchronization is based on the correlation between the received and locally generated BOC signals. Thus, the multiple side-peaks in BOC autocorrelation are one of the main error sources in synchronizing BOC signals. Recently, a new correlation function with no side-peaks was proposed for sine or cosine phased BOC signal synchronization by the authors [7]. In this paper, we propose a novel correlation function for composite binary offset carrier (CBOC) signals by using the similar method to that in [7], which has a better power ratio than the CBOC autocorrelation.","PeriodicalId":448615,"journal":{"name":"2008 10th International Conference on Advanced Communication Technology","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129123224","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 : 2008-04-22DOI: 10.1109/ICACT.2008.4493910
Y. Sang, Jin Bae Park, Seong-Lyun Kim, K. S. Kim
HDD is a duplexing scheme that combines TDD and FDD, taking the advantages of both systems. In this paper a novel overlaid HDD system concept is proposed. The proposed overlaid HDD system uses both TDD and FDD in both regions via two paired frequency bands. Our design objective is to propose an adequate frame structure for the overlaid HDD system with fixed relay stations to enhance the system throughput, especially for the outer region. The frequency reuse factors for the inner and the outer region are set differently to overcome the interference from other cells. It is shown that in the proposed overlaid HDD system, the throughput of the outer region is increased by 58% in the UL and 20% in the DL at 5% throughput loss of the inner region both in the UL and DL compared to that of the overlaid HDD system without relay stations. Also, the proposed overlaid system has 9% gain in the DL compared to the single- band system with relay stations.
{"title":"Overlaid HDD System Using Relays","authors":"Y. Sang, Jin Bae Park, Seong-Lyun Kim, K. S. Kim","doi":"10.1109/ICACT.2008.4493910","DOIUrl":"https://doi.org/10.1109/ICACT.2008.4493910","url":null,"abstract":"HDD is a duplexing scheme that combines TDD and FDD, taking the advantages of both systems. In this paper a novel overlaid HDD system concept is proposed. The proposed overlaid HDD system uses both TDD and FDD in both regions via two paired frequency bands. Our design objective is to propose an adequate frame structure for the overlaid HDD system with fixed relay stations to enhance the system throughput, especially for the outer region. The frequency reuse factors for the inner and the outer region are set differently to overcome the interference from other cells. It is shown that in the proposed overlaid HDD system, the throughput of the outer region is increased by 58% in the UL and 20% in the DL at 5% throughput loss of the inner region both in the UL and DL compared to that of the overlaid HDD system without relay stations. Also, the proposed overlaid system has 9% gain in the DL compared to the single- band system with relay stations.","PeriodicalId":448615,"journal":{"name":"2008 10th International Conference on Advanced Communication Technology","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130254774","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 : 2008-04-22DOI: 10.1109/ICACT.2008.4494122
Sungjoo Kang, Moonyoung Chung, K. Ku, Won-Young Kim, W. Choi
In this paper, we propose a Web-based software management system (WebSMS) for providing the device-independent software execution environment to users. We classify software into three types based on the software execution mechanism - local software, streaming software and portable software. The proposed system merges heterogeneous software execution modules and provides Web-based interface. And it minimizes the dependencies among components and provides seamless software using interface for users.
{"title":"Web-based Software Management System","authors":"Sungjoo Kang, Moonyoung Chung, K. Ku, Won-Young Kim, W. Choi","doi":"10.1109/ICACT.2008.4494122","DOIUrl":"https://doi.org/10.1109/ICACT.2008.4494122","url":null,"abstract":"In this paper, we propose a Web-based software management system (WebSMS) for providing the device-independent software execution environment to users. We classify software into three types based on the software execution mechanism - local software, streaming software and portable software. The proposed system merges heterogeneous software execution modules and provides Web-based interface. And it minimizes the dependencies among components and provides seamless software using interface for users.","PeriodicalId":448615,"journal":{"name":"2008 10th International Conference on Advanced Communication Technology","volume":"24 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130994329","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 : 2008-04-22DOI: 10.1109/ICACT.2008.4494082
Rong Luo, Bin Chen
A hierarchical flexible macroblock ordering (FMO) scheme is proposed in this paper, which can be combined well with region of interest (ROI) based error resilient coding schemes while much fewer header bits are added than the existing FMO schemes in H.264/AVC standard. By defining a new FMO type with small modification of the syntax of H.264/AVC standard, the proposed FMO scheme can not only encode the ROI region and the non-ROI region in different slice groups, but also further divide the ROI region into several sub slice groups. It achieves a better tradeoff between video compression efficiency and error resilient performance by the hierarchical FMO scheme when the video data is transmitted over error-prone networks based on our experiments.
{"title":"A Hierarchical Scheme of Flexible Macroblock Ordering for ROI based H.264/AVC Video Coding","authors":"Rong Luo, Bin Chen","doi":"10.1109/ICACT.2008.4494082","DOIUrl":"https://doi.org/10.1109/ICACT.2008.4494082","url":null,"abstract":"A hierarchical flexible macroblock ordering (FMO) scheme is proposed in this paper, which can be combined well with region of interest (ROI) based error resilient coding schemes while much fewer header bits are added than the existing FMO schemes in H.264/AVC standard. By defining a new FMO type with small modification of the syntax of H.264/AVC standard, the proposed FMO scheme can not only encode the ROI region and the non-ROI region in different slice groups, but also further divide the ROI region into several sub slice groups. It achieves a better tradeoff between video compression efficiency and error resilient performance by the hierarchical FMO scheme when the video data is transmitted over error-prone networks based on our experiments.","PeriodicalId":448615,"journal":{"name":"2008 10th International Conference on Advanced Communication Technology","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131141063","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 : 2008-04-22DOI: 10.1109/ICACT.2008.4493997
Chang Soo Kim, Wonjae Lee, Y. Bak, Hag-Young Kim
For providing high quality multimedia streaming services over high speed network, various solutions such as performance improvement of computer system, efficient cluster management and request dispatching into back-end nodes, good load balancing scheme, global infrastructure management and efficient contents distribution mechanism are required. In this paper, we will describe the global request dispatching scheme in design and implementation aspects for supporting high quality multimedia streaming services in high speed network environments. With this scheme, we can get good performance and correctness in dispatching service requests.
{"title":"An Efficient Global Request Dispatching Scheme for Multimedia Streaming Services","authors":"Chang Soo Kim, Wonjae Lee, Y. Bak, Hag-Young Kim","doi":"10.1109/ICACT.2008.4493997","DOIUrl":"https://doi.org/10.1109/ICACT.2008.4493997","url":null,"abstract":"For providing high quality multimedia streaming services over high speed network, various solutions such as performance improvement of computer system, efficient cluster management and request dispatching into back-end nodes, good load balancing scheme, global infrastructure management and efficient contents distribution mechanism are required. In this paper, we will describe the global request dispatching scheme in design and implementation aspects for supporting high quality multimedia streaming services in high speed network environments. With this scheme, we can get good performance and correctness in dispatching service requests.","PeriodicalId":448615,"journal":{"name":"2008 10th International Conference on Advanced Communication Technology","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128149316","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 : 2008-04-22DOI: 10.1109/ICACT.2008.4494032
Son Le, Xu Huang, D. Sharma
RFID has been gaining momentum in the last few years. To-date many enterprises, in particular suppliers, have found themselves in a position that they must implement RFID to comply with well-publicized high-profile mandates (e.g. Wal-Mart and US DoD). Therefore, many early RFID solutions just did enough to satisfy the commercial and contractual requirements. The solutions mainly focused on technical features like tags, readers, basic tag-reader communications, etc. Future RFID implementations such as in supply chain management and businesses need to include a more comprehensive and inter-relating set of capabilities and to embrace a systematic and integrated architectural approach in order to take advantage of the long-term benefits of RFID technology. This paper proposes a holistic architectural approach that can be used to gain an understanding of the "next big thing" technology, the architectural considerations for designing and implementing successful RFID systems to fully realize greater business value. It is grounded in industry observations and real-world enterprise architecture practice.
{"title":"Realizing Greater Business Value of Contemporary RFID Systems","authors":"Son Le, Xu Huang, D. Sharma","doi":"10.1109/ICACT.2008.4494032","DOIUrl":"https://doi.org/10.1109/ICACT.2008.4494032","url":null,"abstract":"RFID has been gaining momentum in the last few years. To-date many enterprises, in particular suppliers, have found themselves in a position that they must implement RFID to comply with well-publicized high-profile mandates (e.g. Wal-Mart and US DoD). Therefore, many early RFID solutions just did enough to satisfy the commercial and contractual requirements. The solutions mainly focused on technical features like tags, readers, basic tag-reader communications, etc. Future RFID implementations such as in supply chain management and businesses need to include a more comprehensive and inter-relating set of capabilities and to embrace a systematic and integrated architectural approach in order to take advantage of the long-term benefits of RFID technology. This paper proposes a holistic architectural approach that can be used to gain an understanding of the \"next big thing\" technology, the architectural considerations for designing and implementing successful RFID systems to fully realize greater business value. It is grounded in industry observations and real-world enterprise architecture practice.","PeriodicalId":448615,"journal":{"name":"2008 10th International Conference on Advanced Communication Technology","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128299968","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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