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Realization of arbitrary transfer current characteristic using transconductors CDTA 利用电感CDTA实现任意转移电流特性
2008 18th International Conference Radioelektronika Pub Date : 2008-04-24 DOI: 10.1109/RADIOELEK.2008.4542685
T. Dostál, V. Šmejkal, J. Slezák
{"title":"Realization of arbitrary transfer current characteristic using transconductors CDTA","authors":"T. Dostál, V. Šmejkal, J. Slezák","doi":"10.1109/RADIOELEK.2008.4542685","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2008.4542685","url":null,"abstract":"Active RC circuits with arbitrary transfer characteristics in current mode are presented in this paper. The given circuits are based on the multiple-loop feedback structure, namely on the follow-the-leader feedback structure with output summation. Modeling by signal flow graph technique is used to modify and transform the structure in current mode. Implementations by multi-output current-differencing-input transconductors (CDTA) are given. Verification and illustration are shown. The designed circuits have been simulated in PSpice and SNAP, resulting responses are confirming the theoretical assumptions.","PeriodicalId":162482,"journal":{"name":"2008 18th International Conference Radioelektronika","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133243321","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
Doppler spread estimation for OFDM systems using Newton polynomials 基于牛顿多项式的OFDM系统多普勒扩频估计
2008 18th International Conference Radioelektronika Pub Date : 2008-04-24 DOI: 10.1109/RADIOELEK.2008.4542713
A. Ali, A. Balalem, T. Khanzada, J. Macháč, A. Omar
{"title":"Doppler spread estimation for OFDM systems using Newton polynomials","authors":"A. Ali, A. Balalem, T. Khanzada, J. Macháč, A. Omar","doi":"10.1109/RADIOELEK.2008.4542713","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2008.4542713","url":null,"abstract":"This paper presents a method of estimating the Doppler spread for OFDM systems in rapidly time-variant channels. The method utilizes an approximation of the time variation of the channel by considering a few Newton polynomials over five successive OFDM symbols. Doppler spread is estimated in the frequency domain from the off- diagonals of the approximated channel matrix.","PeriodicalId":162482,"journal":{"name":"2008 18th International Conference Radioelektronika","volume":"262 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133939417","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
Non-line-of-sight mitigation technique in wireless location system 无线定位系统中的非视距缓解技术
2008 18th International Conference Radioelektronika Pub Date : 2008-04-24 DOI: 10.1109/RADIOELEK.2008.4542696
Bian Jiang-Ning, Bao Xu, Wang Gang
{"title":"Non-line-of-sight mitigation technique in wireless location system","authors":"Bian Jiang-Ning, Bao Xu, Wang Gang","doi":"10.1109/RADIOELEK.2008.4542696","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2008.4542696","url":null,"abstract":"Non-line-of-sight (NLOS) error is the most common and also a major source of errors in wireless location system. This paper presents an approach to ameliorate the effect of the NLOS using Time Difference Of Arrival (TDOA) with more than minimum number of base stations (BSs). This algorithm makes use of the redundant TDOA measurements to formulate a problem as a test of hypothesis in order to get a hard decision to discard the NLOS-BSs, comparing with one certain ratio proposed in this paper, and it has no use for the distributing probability of the NLOS noise. Numerical simulations show that the proposed algorithm can completely discard the NLOS-BSs when NLOS error is higher than the measurement noise.","PeriodicalId":162482,"journal":{"name":"2008 18th International Conference Radioelektronika","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130147613","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
Bluetooth EDR Physical Layer modeling 蓝牙EDR物理层建模
2008 18th International Conference Radioelektronika Pub Date : 2008-04-24 DOI: 10.1109/RADIOELEK.2008.4542701
J. Mikulka, S. Hanus
{"title":"Bluetooth EDR Physical Layer modeling","authors":"J. Mikulka, S. Hanus","doi":"10.1109/RADIOELEK.2008.4542701","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2008.4542701","url":null,"abstract":"This paper deals with the Bluetooth Physical Layer simulation in Mathworks Matlab. Models for basic rate and enhanced data rate mode were made. Simulations for 1, 2 and 3 Mbit/s data rates are presented. All of the Physical Layer processing including scrambling, forward error correction and packetization is simulated. Baseband simulations of transmission over AWGN channel are introduced and graphical results are compared with the theory. All Bluetooth simulations are part of the Bluetooth and Wi-Fi coexistence research.","PeriodicalId":162482,"journal":{"name":"2008 18th International Conference Radioelektronika","volume":"211 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124736910","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
Optimalization of GMM for text independent speaker verification system 文本独立说话人验证系统的GMM优化
2008 18th International Conference Radioelektronika Pub Date : 2008-04-24 DOI: 10.1109/RADIOELEK.2008.4542690
P. Varchol, D. Levický, J. Juhár
{"title":"Optimalization of GMM for text independent speaker verification system","authors":"P. Varchol, D. Levický, J. Juhár","doi":"10.1109/RADIOELEK.2008.4542690","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2008.4542690","url":null,"abstract":"This paper presents automatic verification system based on the voice recognition technology. System works as text independent and is designed to verify a person using a short utterance. GMM method is used for speaker modeling and GMM-UBM classifier is used for process of decision. The main goal of experiments in this paper is to finding the optimum size of the GMM and UBM models (optimum numbers of components). Experimental evaluation of the system is conducted on the database of 24 people, where around 6 minutes of speech data from one person is available for training and 3 types of utterances with different lengths from 1 to 9 seconds are available for testing.","PeriodicalId":162482,"journal":{"name":"2008 18th International Conference Radioelektronika","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132448671","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
Data transmission over voice dedicated channels using digital modulations 使用数字调制的语音专用信道上的数据传输
2008 18th International Conference Radioelektronika Pub Date : 2008-04-24 DOI: 10.1109/RADIOELEK.2008.4542682
T. Chmayssani, G. Baudoin
{"title":"Data transmission over voice dedicated channels using digital modulations","authors":"T. Chmayssani, G. Baudoin","doi":"10.1109/RADIOELEK.2008.4542682","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2008.4542682","url":null,"abstract":"With the actual expansion in communication systems, data channels are taking more importance, especially in mobile data networks. But in some cases the transmission over data channels is not possible or not convenient, which makes the data transmission over voice channel an interesting alternative. Firstly, the operators of mobile phone networks (GSM, GPRS) tend to limit the access to the Internet in order to prevent Voice over IP (VoIP) for economical reasons. Secondly, the cross- networks bridges used in VoIP (VoIP-ISDN, VoIP-GSM, VoIP-PSTN) give an opportunity to transmit data over this voice channel without any additional data bridges. Thirdly, for security matters, transiting data dissimulated in a voice-like signal is more discrete. Lastly, some communication networks such as THURAYA are dedicated to voice communications.","PeriodicalId":162482,"journal":{"name":"2008 18th International Conference Radioelektronika","volume":"149 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116908503","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: 23
A high-input-impedance buffer 高输入阻抗缓冲器
2008 18th International Conference Radioelektronika Pub Date : 2002-11-07 DOI: 10.1109/RADIOELEK.2008.4542707
J. Hribik, Š. Lányi, M. Hruškovic
{"title":"A high-input-impedance buffer","authors":"J. Hribik, Š. Lányi, M. Hruškovic","doi":"10.1109/RADIOELEK.2008.4542707","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2008.4542707","url":null,"abstract":"A circuit diagram and an equivalent circuit of high-input-impedance buffer stage with bootstrapped input biasing resistor and power supply nodes are given. The efficiencies of the bootstrapping of the input biasing resistor and the power supply nodes are simulated in the equivalent circuit. The analysis of the equivalent circuit of the buffer leads to a set of equations for calculation of the voltage gain and the input impedance. Experimental results show the expected very high input impedance of the buffer.","PeriodicalId":162482,"journal":{"name":"2008 18th International Conference Radioelektronika","volume":"125 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122032812","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: 12
Proceedings of the 18th international conference radioelektronika 2008 2008年第18届国际无线电电子会议论文集
2008 18th International Conference Radioelektronika Pub Date : 1900-01-01 DOI: 10.1109/radioelek.2008.4542679
{"title":"Proceedings of the 18th international conference radioelektronika 2008","authors":"","doi":"10.1109/radioelek.2008.4542679","DOIUrl":"https://doi.org/10.1109/radioelek.2008.4542679","url":null,"abstract":"The following topics are dealt with: signal processing; audio-video technologies; image processing; radio communication and navigation system; RF circuit and measurement.","PeriodicalId":162482,"journal":{"name":"2008 18th International Conference Radioelektronika","volume":"1 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":"130110027","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
Air traffic control radar tester 空中交通管制雷达测试员
2008 18th International Conference Radioelektronika Pub Date : 1900-01-01 DOI: 10.1109/radioelek.2009.5158783
P. Kovacs, L. Dudás, R. Seller, J. Orban
{"title":"Air traffic control radar tester","authors":"P. Kovacs, L. Dudás, R. Seller, J. Orban","doi":"10.1109/radioelek.2009.5158783","DOIUrl":"https://doi.org/10.1109/radioelek.2009.5158783","url":null,"abstract":"Our aim is to develop a radar tester equipment for commercial and military services. The task is to create one (or more) target or clutter on the radar screen with given distance, velocity and fluctuation. This equipment is placed within few hundred meters from the radar, so it is able to analyze the whole radar system from the antenna, via microwave hardware elements, to the DSP unit. We have some experience in this field, included in the references but also briefly introduced in this paper.","PeriodicalId":162482,"journal":{"name":"2008 18th International Conference Radioelektronika","volume":"14 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":"121080337","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
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