Pub Date : 2005-12-19DOI: 10.1109/ICET.2005.1558845
F. Gul, F. Jiancheng
The residual sensor errors and misalignment of an inertial navigation system cause deviation from the true navigation solution. The navigation errors grow as function of time, sensor errors and vehicle dynamics. A celestial aided inertial navigation system (INS), carried on a space vehicle, has to rely on the independent INS output until the vehicle gets out of the dense atmospheric layer. The misalignment and gyro drift then can be corrected employing techniques for in-flight alignment by celestial observations. The accelerometer bias can be detected and compensated after the burn out point. Subsequent contribution to navigation error due to misalignment and sensor errors thus can be restricted. The accumulated velocity and position errors, however, cannot be directly determined from celestial observations and the knowledge of accelerometer bias. A technique for velocity and position error computation is presented. Simulations for strapdown inertial navigation system (SINS), mechanized in space stabilized reference frame, are carried out. Tremendous improvement in navigation accuracy is observed
{"title":"Correction technique for velocity and position error of inertial navigation system by celestial observations","authors":"F. Gul, F. Jiancheng","doi":"10.1109/ICET.2005.1558845","DOIUrl":"https://doi.org/10.1109/ICET.2005.1558845","url":null,"abstract":"The residual sensor errors and misalignment of an inertial navigation system cause deviation from the true navigation solution. The navigation errors grow as function of time, sensor errors and vehicle dynamics. A celestial aided inertial navigation system (INS), carried on a space vehicle, has to rely on the independent INS output until the vehicle gets out of the dense atmospheric layer. The misalignment and gyro drift then can be corrected employing techniques for in-flight alignment by celestial observations. The accelerometer bias can be detected and compensated after the burn out point. Subsequent contribution to navigation error due to misalignment and sensor errors thus can be restricted. The accumulated velocity and position errors, however, cannot be directly determined from celestial observations and the knowledge of accelerometer bias. A technique for velocity and position error computation is presented. Simulations for strapdown inertial navigation system (SINS), mechanized in space stabilized reference frame, are carried out. Tremendous improvement in navigation accuracy is observed","PeriodicalId":222828,"journal":{"name":"Proceedings of the IEEE Symposium on Emerging Technologies, 2005.","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121821420","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 : 2005-12-19DOI: 10.1109/ICET.2005.1558852
K. M. Aamir, M. A. Maud, A. Loan
The classical Cooley-Tukey fast Fourier transform (FFT) algorithm has the computational cost of O(Nlog2N) where N is the length of the discrete signal. Spectrum resolution is improved through padding zeros at the tail of the discrete signal, if (p -1)N zeros are padded (where p is an integer) at the tail of the data sequence, the computational cost through FFT becomes O(pNlog2pN). This paper proposes an alternate instance of padding zeros to the data sequence that results in computational cost reduction to O(pNlog2 N). It has been noted that this modification can be used to achieve non-uniform upsampling that would zoom-in or zoom-out a particular frequency band, in addition, it may be used for pruning the spectrum, which would reduce resolution of an unimportant frequency band
{"title":"On Cooley-Tukey FFT method for zero padded signals","authors":"K. M. Aamir, M. A. Maud, A. Loan","doi":"10.1109/ICET.2005.1558852","DOIUrl":"https://doi.org/10.1109/ICET.2005.1558852","url":null,"abstract":"The classical Cooley-Tukey fast Fourier transform (FFT) algorithm has the computational cost of O(Nlog2N) where N is the length of the discrete signal. Spectrum resolution is improved through padding zeros at the tail of the discrete signal, if (p -1)N zeros are padded (where p is an integer) at the tail of the data sequence, the computational cost through FFT becomes O(pNlog2pN). This paper proposes an alternate instance of padding zeros to the data sequence that results in computational cost reduction to O(pNlog2 N). It has been noted that this modification can be used to achieve non-uniform upsampling that would zoom-in or zoom-out a particular frequency band, in addition, it may be used for pruning the spectrum, which would reduce resolution of an unimportant frequency band","PeriodicalId":222828,"journal":{"name":"Proceedings of the IEEE Symposium on Emerging Technologies, 2005.","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115762879","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 : 2005-12-19DOI: 10.1109/ICET.2005.1558878
S. Abrar
Blind equalization isatechnique foradaptive equalization ofacommunication channel without theaidoftheusual training sequence. Stochastic gradient based blind equalization algorithms equalize thedispersive signals byexploitingthehigh-order statistics ofthetransmitted signal which areembedded insomepre-calculated constants. These constants, usually termed asdispersion constants, contain the information about thesize, shape andenergy ofthetransmitted signal. Dispersion constants also provide propel' gain oftheequalizer suchthat themeanfluctuation inadaptation process iszero(orminimum). Constant modulus algorithm (CMA)isawidely-stutdied andprobably themost famous blind equalization method in literature andpractice. Inthis work, wecontribute alittle by providing simple formulas forthedispersion constants used inCMAandsigned-error CMAforPAMandQAMsignals.
{"title":"Evaluation of dispersion constants for signed-error blind equalization algorithms","authors":"S. Abrar","doi":"10.1109/ICET.2005.1558878","DOIUrl":"https://doi.org/10.1109/ICET.2005.1558878","url":null,"abstract":"Blind equalization isatechnique foradaptive equalization ofacommunication channel without theaidoftheusual training sequence. Stochastic gradient based blind equalization algorithms equalize thedispersive signals byexploitingthehigh-order statistics ofthetransmitted signal which areembedded insomepre-calculated constants. These constants, usually termed asdispersion constants, contain the information about thesize, shape andenergy ofthetransmitted signal. Dispersion constants also provide propel' gain oftheequalizer suchthat themeanfluctuation inadaptation process iszero(orminimum). Constant modulus algorithm (CMA)isawidely-stutdied andprobably themost famous blind equalization method in literature andpractice. Inthis work, wecontribute alittle by providing simple formulas forthedispersion constants used inCMAandsigned-error CMAforPAMandQAMsignals.","PeriodicalId":222828,"journal":{"name":"Proceedings of the IEEE Symposium on Emerging Technologies, 2005.","volume":"138 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127440571","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 : 2005-12-19DOI: 10.1109/ICET.2005.1558861
Usman Ali, Syed Junaid Nawaz, A.G.H. Jadoon, Shahid A. Khan
There are a number of Internet based instant messengers and mobile-to-Internet instant messengers but there is no such publication addressing mobile-to-mobile instant messaging solution for wireless text based communication through General Packet Radio Services (GPRS) networks without involving Internet based servers. This paper addresses recent research and development efforts in constructing wireless real-time chat server/client through GPRS networks. It discusses the server and client system architecture, design, and technologies. The paper demonstrates an application example of real-time chat server/client and addresses the development-time and implementation-time experiences
{"title":"Mobile-to-mobile IM: a real time chatting system for GPRS networks","authors":"Usman Ali, Syed Junaid Nawaz, A.G.H. Jadoon, Shahid A. Khan","doi":"10.1109/ICET.2005.1558861","DOIUrl":"https://doi.org/10.1109/ICET.2005.1558861","url":null,"abstract":"There are a number of Internet based instant messengers and mobile-to-Internet instant messengers but there is no such publication addressing mobile-to-mobile instant messaging solution for wireless text based communication through General Packet Radio Services (GPRS) networks without involving Internet based servers. This paper addresses recent research and development efforts in constructing wireless real-time chat server/client through GPRS networks. It discusses the server and client system architecture, design, and technologies. The paper demonstrates an application example of real-time chat server/client and addresses the development-time and implementation-time experiences","PeriodicalId":222828,"journal":{"name":"Proceedings of the IEEE Symposium on Emerging Technologies, 2005.","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123695622","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 : 2005-12-19DOI: 10.1109/ICET.2005.1558922
M. Raza
This paper discusses the approaches used for integration testing of object oriented applications that have been modeled in unified modeling language. It explains integration testing and the test design patterns used far integration testing. Integration problems arise due to lack of interoperability among different components. Strategies for class test order for integration testing have been discussed in this paper, as integration test order specifies the estimated cost for developing stubs' and drivers. Semantics for UML diagrams enable the dependency analysis of components for integration testing. Techniques far replacing classes by stubs for breaking cycles among them have been discussed to enable stepwise integration testing.
{"title":"Comparison of class test integration ordering strategies","authors":"M. Raza","doi":"10.1109/ICET.2005.1558922","DOIUrl":"https://doi.org/10.1109/ICET.2005.1558922","url":null,"abstract":"This paper discusses the approaches used for integration testing of object oriented applications that have been modeled in unified modeling language. It explains integration testing and the test design patterns used far integration testing. Integration problems arise due to lack of interoperability among different components. Strategies for class test order for integration testing have been discussed in this paper, as integration test order specifies the estimated cost for developing stubs' and drivers. Semantics for UML diagrams enable the dependency analysis of components for integration testing. Techniques far replacing classes by stubs for breaking cycles among them have been discussed to enable stepwise integration testing.","PeriodicalId":222828,"journal":{"name":"Proceedings of the IEEE Symposium on Emerging Technologies, 2005.","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125391406","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 : 2005-12-19DOI: 10.1109/ICET.2005.1558926
F. Azam, Zhang Li, R. Ahmad
Current Web modelling languages fail to adequately support the representation of some aspects of Web systems, particularly higher-level information aspects. Among various aspects, the problem of disconnection between business models and technical architectures and also disconnection between functional architecture and information architecture are particularly focus of our work. Earlier, we have presented a UML profile for representing higher-level information aspects: those we believe, can adequately address the problem of disconnection. In this paper we provide guidelines for mapping our UML profile to various other approaches representing business models and functional aspects of business processes at architectural level. Resultantly. it provides an ability of the profile to form bridges between business models and technical architecture besides integrating functional and information architectural aspects.
{"title":"Linking business models and technical architecture of Web applications using UML profile","authors":"F. Azam, Zhang Li, R. Ahmad","doi":"10.1109/ICET.2005.1558926","DOIUrl":"https://doi.org/10.1109/ICET.2005.1558926","url":null,"abstract":"Current Web modelling languages fail to adequately support the representation of some aspects of Web systems, particularly higher-level information aspects. Among various aspects, the problem of disconnection between business models and technical architectures and also disconnection between functional architecture and information architecture are particularly focus of our work. Earlier, we have presented a UML profile for representing higher-level information aspects: those we believe, can adequately address the problem of disconnection. In this paper we provide guidelines for mapping our UML profile to various other approaches representing business models and functional aspects of business processes at architectural level. Resultantly. it provides an ability of the profile to form bridges between business models and technical architecture besides integrating functional and information architectural aspects.","PeriodicalId":222828,"journal":{"name":"Proceedings of the IEEE Symposium on Emerging Technologies, 2005.","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125581771","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 : 2005-12-19DOI: 10.1109/ICET.2005.1558847
M. Talib, M. T. Ibrahim, S. Tauseef-ur-Rehman
This paper presents a new method for nonlinear image interpolation. Previous directional interpolation methods only take the edges along a certain direction and then perform interpolation on such images. Our proposed method in its first step decomposes the image into its directional components based on fan filters presented in R.H. Bamberger (1990). These outputs differ from previous methods as it partitions the image based on its global directional features. The second step is to perform 'slope hold interpolation', a new method for image interpolation on all the directional images, and final step is to add all these directionally interpolated images to get the resultant image. Result of processing cameraman image is presented to demonstrate the effectiveness of our proposed algorithm
{"title":"Slope hold image interpolation using fan filters","authors":"M. Talib, M. T. Ibrahim, S. Tauseef-ur-Rehman","doi":"10.1109/ICET.2005.1558847","DOIUrl":"https://doi.org/10.1109/ICET.2005.1558847","url":null,"abstract":"This paper presents a new method for nonlinear image interpolation. Previous directional interpolation methods only take the edges along a certain direction and then perform interpolation on such images. Our proposed method in its first step decomposes the image into its directional components based on fan filters presented in R.H. Bamberger (1990). These outputs differ from previous methods as it partitions the image based on its global directional features. The second step is to perform 'slope hold interpolation', a new method for image interpolation on all the directional images, and final step is to add all these directionally interpolated images to get the resultant image. Result of processing cameraman image is presented to demonstrate the effectiveness of our proposed algorithm","PeriodicalId":222828,"journal":{"name":"Proceedings of the IEEE Symposium on Emerging Technologies, 2005.","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116086751","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 : 2005-12-19DOI: 10.1109/ICET.2005.1558894
Y. Zafar, M.M. Ahmad
This paper deals with the implementation of globally asynchronous locally synchronous (GALS), micropipelined processor in field programmable gate arrays (FPGA). Associated issues like delay model incorporating on-chip, technology independent single inverter ring oscillator (SIRO) and an unbundled datapath based on bit-encoding and return-to-zero (RTZ) schemes are also presented. Post-layout simulation results are presented to describe the behavior of various sections of the design
{"title":"Globally asynchronous locally synchronous micropipelined processor implementation in FPGA","authors":"Y. Zafar, M.M. Ahmad","doi":"10.1109/ICET.2005.1558894","DOIUrl":"https://doi.org/10.1109/ICET.2005.1558894","url":null,"abstract":"This paper deals with the implementation of globally asynchronous locally synchronous (GALS), micropipelined processor in field programmable gate arrays (FPGA). Associated issues like delay model incorporating on-chip, technology independent single inverter ring oscillator (SIRO) and an unbundled datapath based on bit-encoding and return-to-zero (RTZ) schemes are also presented. Post-layout simulation results are presented to describe the behavior of various sections of the design","PeriodicalId":222828,"journal":{"name":"Proceedings of the IEEE Symposium on Emerging Technologies, 2005.","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128323392","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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