{"title":"Spectrum characteristic analysis of DDS-based RF digital modulation","authors":"Jigang Liu, Jian Liu","doi":"10.1109/TENCON.2001.949662","DOIUrl":"https://doi.org/10.1109/TENCON.2001.949662","url":null,"abstract":"A conventional radio frequency (RF) modulator with phase locked loop (PLL) has disadvantages in modulated specification and complicated systems. With the fast development of direct digital synthesis (DDS), DDS can be incorporated into the RF modulator, which results in flexible changing parameters and adding digital filters. However, the DDS modulator also causes some problems such as low output frequency and worse spurs. This paper discusses the results of RF digital modulation combining DDS with PLL and analyzes its modulator character and output spectrum character for ideal conditions. As a result, the RF output character in the loop band width is decided by DDS, and out of the loop band width is decided by a voltage controlled oscillator (VCO). The spurs of the DDS output can be filtered out and thus a good modulated signal spectrum can be achieved. Experimental results are presented. By combination of DDS with PLL, an RF digital modulator with good performance and low cost can be obtained.","PeriodicalId":358168,"journal":{"name":"Proceedings of IEEE Region 10 International Conference on Electrical and Electronic Technology. TENCON 2001 (Cat. No.01CH37239)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123987049","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}
{"title":"Circuit simulation of dynamic performances of the switched reluctance motor","authors":"K. Srinivas, R. Arumugam","doi":"10.1109/TENCON.2001.949663","DOIUrl":"https://doi.org/10.1109/TENCON.2001.949663","url":null,"abstract":"Dynamic characterization by simulation of switched reluctance motor (SRM) systems and the development of a package for the same is the scope of this paper. The modeling of electromagnetic, control and mechanical concerns is presented in this paper. The time varying parameter, namely the inductance of SRM, which solely determine the dynamic response of the machine, is rigorously evaluated using the finite element analysis package, ANSOFT. Based on this model, a circuit simulation package is designed in the Maxwell SPICE environment using the power of EMSS tool. This can simulate the speed and torque of SRM at any load conditions. Detailed simulation results for various load conditions is the highlight of this report.","PeriodicalId":358168,"journal":{"name":"Proceedings of IEEE Region 10 International Conference on Electrical and Electronic Technology. TENCON 2001 (Cat. No.01CH37239)","volume":"437 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131591877","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}
{"title":"An error compensation method for transfer alignment","authors":"You-chol Lim, J. Lyou","doi":"10.1109/TENCON.2001.949715","DOIUrl":"https://doi.org/10.1109/TENCON.2001.949715","url":null,"abstract":"This paper deals with the transfer alignment problem of SDINS (StrapDown Inertial Navigation System) subjected to roll and pitch motions of the ship. Specifically, to reduce alignment errors induced by measurement time-delay and ship body flexure, an error compensation method is deviced based on delay state augmentation and DCM (Direction Cosine Matrix) partial matching. A linearized error model for the velocity and attitude matching transfer alignment system is first derived by linearizing the nonlinear measurement equation with respect to its time delay and augmenting the delay state into the conventional linear state equations. And then DCM partial matching is properly combined to reduce effects of a ship's Y axis flexure. The simulation results show that the present method is effective enough resulting in considerably less azimuth alignment errors.","PeriodicalId":358168,"journal":{"name":"Proceedings of IEEE Region 10 International Conference on Electrical and Electronic Technology. TENCON 2001 (Cat. No.01CH37239)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116870307","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}
{"title":"New transformation techniques for performance analysis of SC over correlated Rayleigh fading channels","authors":"Chunhua Yang, G. Bi","doi":"10.1109/TENCON.2001.949644","DOIUrl":"https://doi.org/10.1109/TENCON.2001.949644","url":null,"abstract":"This paper presents an approach to determine the bit error rate of selection combiners over correlated Rayleigh fading channels with an arbitrary covariance matrix. Our approach relies on a linear transformation technique to convert correlated Rayleigh fading signals into uncorrelated ones. The proposed analysis technique can be used for any number of correlated Rayleigh fading signals with balanced and unbalanced signal power. Based on our proposed approach the effects of diversity order, branch separation, and branch imbalance on the error performance are obtained which is not available in the previous literature.","PeriodicalId":358168,"journal":{"name":"Proceedings of IEEE Region 10 International Conference on Electrical and Electronic Technology. TENCON 2001 (Cat. No.01CH37239)","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124381817","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}
{"title":"Evaluation of lamination materials in zero-speed sensorless controlled induction machine drives","authors":"T. Wolbank, M. Wolbank","doi":"10.1109/TENCON.2001.949667","DOIUrl":"https://doi.org/10.1109/TENCON.2001.949667","url":null,"abstract":"Control of induction machines without mechanical sensors has gained more and more interest in the past years. Different methods for sensorless control have been proposed in literature recently. The performance of methods, which are based on fundamental wave models of the machine deteriorate at low frequency. To guarantee a stable operation, even at zero fundamental electrical frequency, it is thus necessary to exploit parasitic effects of the machine, which are not visible in normal operation of the drive. All proposed zero-speed methods have in common, that they need an additional excitation of the machine in order to make parasitic saliencies visible. This additional excitation can be a high frequency current or voltage signal of some hundred Hz which is superposed to the fundamental wave, and which may be a rotating or pulsating signal. Another way of excitation can be realised by applying voltage test pulses to the terminals of the machine. These voltage pulses may be either separated from the fundamental wave PWM or they may be integrated into the current control scheme. All mentioned methods evaluate the high frequency current or voltage response of the machine in order to extract a flux- or rotor-position signal. It is thus important to consider the high frequency properties of the lamination sheet when designing a sensorless controlled drive. In this paper, a sensorless control method using voltage test pulses is applied to different induction machines, all with the same winding scheme and lamination design, but with different lamination materials. Thus the materials influence on the sensorless control is evaluated by comparing the different machines control signals. In addition, all machines are equipped with measurement coils at different spots of the machine which enable a comparison of the transient flux linkage change along the air gap of the machine.","PeriodicalId":358168,"journal":{"name":"Proceedings of IEEE Region 10 International Conference on Electrical and Electronic Technology. TENCON 2001 (Cat. No.01CH37239)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125265043","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}
{"title":"Recent transmission technology development for multimedia services (ADSL for Internet multimedia)","authors":"S. Takeuchi","doi":"10.1109/TENCON.2001.949538","DOIUrl":"https://doi.org/10.1109/TENCON.2001.949538","url":null,"abstract":"ADSL (asymmetric digital subscriber line) is the technology that has become very important to fill up the gap between the present urgent need for the wider bandwidth required for the ever increasing Internet applications and the time required for the installation of fiber optic telecommunication systems. In the meantime, many other new technologies have been developed related to the recent multimedia transmission systems. One such technology is ATM (asynchronous transfer mode) and it has been playing an important role. This paper first reviews some important relevant technology developments, including that of optical fiber, and next looks at the performance of ADSL on ATM using existing commercially available ATM switches.","PeriodicalId":358168,"journal":{"name":"Proceedings of IEEE Region 10 International Conference on Electrical and Electronic Technology. TENCON 2001 (Cat. No.01CH37239)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114522629","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}
{"title":"A CMOS fully-integrated low-voltage vibratory microgyroscope","authors":"Y.C. Liang, Tao Zhao, Y.P. Xu, S. S. Boh","doi":"10.1109/TENCON.2001.949708","DOIUrl":"https://doi.org/10.1109/TENCON.2001.949708","url":null,"abstract":"A low-voltage bulk micromachined microgyroscope is presented in this paper. An ASIC (application specific integrated circuit) is integrated on the same silicon die to minimize the parasitic effect and to ensure the high sensitivity of the microgyroscope. Constraints on the sensitivity and actuation voltage are extremely crucial to modern low-rate high-resolution microgyroscopes used in aerospace applications.","PeriodicalId":358168,"journal":{"name":"Proceedings of IEEE Region 10 International Conference on Electrical and Electronic Technology. TENCON 2001 (Cat. No.01CH37239)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117155197","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}
{"title":"A new algorithmic procedure to test m-sequence generating feedback connections of stream cipher's LFSRs","authors":"A. Ahmad, S. Al-Busaidi, M. J. Al-Mushrafi","doi":"10.1109/TENCON.2001.949615","DOIUrl":"https://doi.org/10.1109/TENCON.2001.949615","url":null,"abstract":"This paper presents a new algorithmic procedure for testing the feedback connections of an LFSR to check whether the design may generate maximal length sequences (m-sequence) or not. Since for an n-bit LFSR the algorithm only requires an (n-1)-bit register operation throughout its entire implementation, it requires minimal CPU time as well as memory space. Therefore, the attribute of the developed algorithm is two-fold. First, it is the fastest available algorithm and secondly, it does not pose a restriction on the length of the LFSR like other existing methods. The simulation results of the algorithm are compared with the results of existing algorithms and found to be much faster than the other existing algorithms. The implementation procedure of the algorithm is demonstrated through an elaborate example.","PeriodicalId":358168,"journal":{"name":"Proceedings of IEEE Region 10 International Conference on Electrical and Electronic Technology. TENCON 2001 (Cat. No.01CH37239)","volume":"833 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123014892","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}
{"title":"Real-time application performance in differentiated services network","authors":"A. Kos, B. Klepec, S. Tomažič","doi":"10.1109/TENCON.2001.949559","DOIUrl":"https://doi.org/10.1109/TENCON.2001.949559","url":null,"abstract":"The Internet traditionally provides service that is commonly characterized as a best-effort service. Many applications run very well using this service model but some new interactive applications such as telephony or video conferencing impose stringent demands to the network. We discuss a proposal for changing the architecture of IP networks in order to provide some level of service discrimination. Architecture for differentiated services (DS) and proposed mechanisms have been analyzed and discussed to a great extent in the past years. The two most known approaches are schemes for throughput sensitive traffic and schemes for delay sensitive traffic. Differentiated services are attractive because they maintain connectionless data transfer in IP networks without the need for per-flow state information in network elements and because they use simple signaling. We first outline both principles for service discrimination and then we use simulations to evaluate them. A scheme for the delay sensitive traffic is realized through strict priority queuing in network elements, while a scheme for throughput sensitive traffic is realized through pre-emptive buffer processing policy. With simulations we evaluate behavior of a differentiated network architecture for two widely used (WWW, FTP) and two emerging Internet applications (video conferencing and IP telephony) and compare them with the best-effort network. The results show that proposed schemes have great positive impact on real-time applications that are assigned \"high priority\". Queuing delays are reduced to great extent and packet delivery without losses in queues is possible. On the other side, the performance of elastic applications is not highly degraded.","PeriodicalId":358168,"journal":{"name":"Proceedings of IEEE Region 10 International Conference on Electrical and Electronic Technology. TENCON 2001 (Cat. No.01CH37239)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115554162","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}
{"title":"Evaluation of protection ratios on COFDM for in-band adjacent-channel digital audio broadcasting","authors":"Young Ho Jeong, S. Park, S. Lee","doi":"10.1109/TENCON.2001.949680","DOIUrl":"https://doi.org/10.1109/TENCON.2001.949680","url":null,"abstract":"The IBAC (in-band adjacent-channel) DAB (digital audio broadcasting) system proposed is able to provide simultaneously multichannel CD quality audio services and multimedia data services including text and pictures in the FM band. As the FM band is being used by the existing analog radio broadcasting, interference between IBAC DAB and analog FM signals may occur. Therefore, the protection ratios should be evaluated to verify the system compatibility and to allocate the new IBAC DAB channel in the FM band. This paper presents the derivation of protection ratios of the IBAC DAB system for FM and IBAC DAB interferer under EIA Rayleigh multipath channel. The simulation results show that the protection ratios of the IBAC DAB system with time interleaving depth of 256ms for co-channel FM and DAB interference are 16.3 to 18.6dB and 18.5 to 20.3dB respectively in four different multipath channels.","PeriodicalId":358168,"journal":{"name":"Proceedings of IEEE Region 10 International Conference on Electrical and Electronic Technology. TENCON 2001 (Cat. No.01CH37239)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124673856","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}