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20th International Conference Radioelektronika 2010最新文献

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On achieving the Shannon bound in cellular systems 细胞系统中香农界的实现
20th International Conference Radioelektronika 2010 Pub Date : 2010-04-19 DOI: 10.1109/RADIOELEK.2010.5478551
M. Rupp, C. Mehlführer, S. Caban
{"title":"On achieving the Shannon bound in cellular systems","authors":"M. Rupp, C. Mehlführer, S. Caban","doi":"10.1109/RADIOELEK.2010.5478551","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2010.5478551","url":null,"abstract":"This contribution provides insight into the performance of the currently deployed 3G cellular systems HSDPA and WiMAX. In extensive measurement campaigns we measured the physical layer throughput of these 3G systems in different environments (alpine and urban) and compare the results rigorously to their upper bounds derived from the well known Shannon capacity. By separating the observed losses into a channel state information loss, a design loss, and an implementation loss, we gain more insight into the performance of the different standards which in turn allows us to compare them better and to localize their shortcomings. In general, we find that implementations of the current standards still operate about 10 dB away from the Shannon bound.","PeriodicalId":398720,"journal":{"name":"20th International Conference Radioelektronika 2010","volume":"123 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120898366","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: 10
Impact of the number of access points in indoor fingerprinting localization 接入点数量对室内指纹定位的影响
20th International Conference Radioelektronika 2010 Pub Date : 2010-04-19 DOI: 10.1109/RADIOELEK.2010.5478585
Juraj Machaj, P. Brida, Barbora Tatarova
{"title":"Impact of the number of access points in indoor fingerprinting localization","authors":"Juraj Machaj, P. Brida, Barbora Tatarova","doi":"10.1109/RADIOELEK.2010.5478585","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2010.5478585","url":null,"abstract":"In the paper the solution for indoor positioning based on IEEE 802.11 platform is proposed and experimentally verified. The paper investigates an impact of the number of access points on the localization accuracy in fingerprinting method. The solution is based on deterministic approach. The properties of the solution are tested by experimental measurements in real environment.","PeriodicalId":398720,"journal":{"name":"20th International Conference Radioelektronika 2010","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121180513","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: 22
Modulator imperfections and I/Q errors influence on the DVB-T signal 调制器缺陷和I/Q误差对DVB-T信号的影响
20th International Conference Radioelektronika 2010 Pub Date : 2010-04-19 DOI: 10.1109/RADIOELEK.2010.5478592
T. Kratochvil, V. Rícný, M. Slanina
{"title":"Modulator imperfections and I/Q errors influence on the DVB-T signal","authors":"T. Kratochvil, V. Rícný, M. Slanina","doi":"10.1109/RADIOELEK.2010.5478592","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2010.5478592","url":null,"abstract":"This paper deals with the modulator imperfections and I/Q errors influence on the DVB-T signal and its spectrum and I/Q constellation analysis. Theoretical backgrounds of the Amplitude Imbalance, Phase Error and Carrier Suppression effects are summarized in the paper. Then the practical results measured in the laboratory environment are compared with the theoretical assumed impacts on Modulation Error Rate from the I/Q constellation and Bit Error Rates before and after Viterbi decoding in DVB-T signal decoding.","PeriodicalId":398720,"journal":{"name":"20th International Conference Radioelektronika 2010","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121278160","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: 1
Estimating a spectral correlation function and its errors owing to inexact frequencies 估计一个频谱相关函数和它的误差由于不精确的频率
20th International Conference Radioelektronika 2010 Pub Date : 2010-04-19 DOI: 10.1109/RADIOELEK.2010.5478575
V. Sebesta
{"title":"Estimating a spectral correlation function and its errors owing to inexact frequencies","authors":"V. Sebesta","doi":"10.1109/RADIOELEK.2010.5478575","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2010.5478575","url":null,"abstract":"This paper is devoted to estimating a spectral correlation function using DFT. The examined signal is a simple DSB-SC signal. The aim of the paper is to analytically describe events connected with nonstandard relations between signal frequency parameters and sampling frequency. They manifest by descending the spectral correlation function modulus. Validity of the analytical description was verified using computer simulations for deviations of carrier frequency, cyclic frequency and both frequencies and variable number of the sliding DFT windows. Analysis of the errors is presented. An imperfection of the analytical relations is mostly insignificant. Founded equations are simple and allow judge consequences of the frequency faultiness without simulations.","PeriodicalId":398720,"journal":{"name":"20th International Conference Radioelektronika 2010","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122507657","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: 1
Real-time implementation of Periodogram based spectrum sensing detector in TV bands 基于周期图的电视波段频谱传感检测器的实时实现
20th International Conference Radioelektronika 2010 Pub Date : 2010-04-19 DOI: 10.1109/RADIOELEK.2010.5478573
K. Povalac, R. Maršálek, G. Baudoin, Petr Sramek
{"title":"Real-time implementation of Periodogram based spectrum sensing detector in TV bands","authors":"K. Povalac, R. Maršálek, G. Baudoin, Petr Sramek","doi":"10.1109/RADIOELEK.2010.5478573","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2010.5478573","url":null,"abstract":"This paper deals with real time implementation of spectrum sensing method used for detection in TV bands. The most common and simplest method of spectrum sensing is based on the energy detection principle (using Periodogram, Bartlett and Welch methods). Intermediate frequency band signal of TV receiver was used in real-time implementation. The main algorithm was implemented on the Memec Development Board with FPGA Virtex IV and with A/D (D/A) converters assembled on analogue module P240. Humax F3-FOX T was chosen as a television receiver. Our results were compared with Matlab simulations based on the same input signals. It shows that we can detect free spaces in the TV channels. The real time realization can be used as an important part of Cognitive Radio chain.","PeriodicalId":398720,"journal":{"name":"20th International Conference Radioelektronika 2010","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115971215","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: 8
Simulation of the DVB-H channel coding and transmission in Matlab 在Matlab中仿真DVB-H信道的编码和传输
20th International Conference Radioelektronika 2010 Pub Date : 2010-04-19 DOI: 10.1109/RADIOELEK.2010.5478591
L. Polak, Tomáš Kratochví
{"title":"Simulation of the DVB-H channel coding and transmission in Matlab","authors":"L. Polak, Tomáš Kratochví","doi":"10.1109/RADIOELEK.2010.5478591","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2010.5478591","url":null,"abstract":"This paper deals with the Matlab implementation of the DVB-H (Digital Video Broadcasting to Handhelds) channel coding in AWGN (Additive White Gaussian Noise) transmission channel. Developed application structure and its functions are described. Channel encoder and decoder were implemented in Matlab as it is specified in the DVB-H standard. Created application can evaluate and shows two types of BER (Bit Error Ratio) - BER before Viterbi decoding and BER after Viterbi decoding. The OFDM (Orthogonal Frequency Division Multiplexing) modulation was not implemented yet. Finally, obtained results are evaluated and discussed.","PeriodicalId":398720,"journal":{"name":"20th International Conference Radioelektronika 2010","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131231811","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: 7
Changes in frequency spectrum of vowels due to psychological stress 由于心理压力导致元音频谱的变化
20th International Conference Radioelektronika 2010 Pub Date : 2010-04-19 DOI: 10.1109/RADIOELEK.2010.5478596
M. Sigmund
{"title":"Changes in frequency spectrum of vowels due to psychological stress","authors":"M. Sigmund","doi":"10.1109/RADIOELEK.2010.5478596","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2010.5478596","url":null,"abstract":"A significant part of information carried in speech signal refers to the speaker expressing their personality, transferring emotions, and reflecting situations such as fatigue, stress or some medical problems. This paper deals with speech signal spoken by speaker under psychological stress. A classification of various states of stress and the corresponding type of stressor is defined. For use in our experiments, a new database of speech under stress consisting of data collected during oral examinations at our university was created. Long-time changes of fundamental frequency and short-time changes in spectrum of vowels due to exam stress were investigated. The primary goal of the study reported here is to give an introduction to the problem “speaker's stress and speech signal”.","PeriodicalId":398720,"journal":{"name":"20th International Conference Radioelektronika 2010","volume":"491 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122175469","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: 1
Signal processing for vector control of AC drive 交流驱动器矢量控制的信号处理
20th International Conference Radioelektronika 2010 Pub Date : 2010-04-19 DOI: 10.1109/RADIOELEK.2010.5478583
P. Brandstetter, P. Simoník
{"title":"Signal processing for vector control of AC drive","authors":"P. Brandstetter, P. Simoník","doi":"10.1109/RADIOELEK.2010.5478583","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2010.5478583","url":null,"abstract":"An induction motor with vector control has a very good dynamic behavior and as a consequence is well suited for high performance applications. But, the vector control is very sensitive to variations in the rotor time constant. In the paper there is presented signal processing for the vector control of an induction motor with rotor time constant adaptation using TMS320F2812 DSP. The method employs the model reference adaptive system. The estimated rotor time constant is necessary for so-called current model which is used in the vector control and serves for the determination of the quantities for the transformation from stationary reference frame into reference frame. At the end of the paper some experimental results are provided to demonstrate the effectiveness of realized signal processing.","PeriodicalId":398720,"journal":{"name":"20th International Conference Radioelektronika 2010","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114463178","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: 1
In-system jitter measurement using FPGA 利用FPGA进行系统内抖动测量
20th International Conference Radioelektronika 2010 Pub Date : 2010-04-19 DOI: 10.1109/RADIOELEK.2010.5478560
M. Kubícek
{"title":"In-system jitter measurement using FPGA","authors":"M. Kubícek","doi":"10.1109/RADIOELEK.2010.5478560","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2010.5478560","url":null,"abstract":"The paper describes architecture, detailed implementation and measurement results of newly developed jitter measurement device. The device is implemented using a single FPGA. Probably the biggest benefit of the proposed method is that it requires no external components, just the FPGA. As such it can be implemented into an existing receiver with an FPGA without any changes to its hardware. The new jitter measurement block was implementer and tested on a real link. Comparison with jitter measurement using an oscilloscope is given to prove its reasonable performance. Compared to previously published jitter measurement methods the module is able to monitor high frequency jitter. It is also very efficient in terms of required hardware resources.","PeriodicalId":398720,"journal":{"name":"20th International Conference Radioelektronika 2010","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116284888","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
Active RC notch filter for phase-locked loop 锁相环有源RC陷波滤波器
20th International Conference Radioelektronika 2010 Pub Date : 2010-04-19 DOI: 10.1109/RADIOELEK.2010.5478553
Z. Brezović, V. Kudják
{"title":"Active RC notch filter for phase-locked loop","authors":"Z. Brezović, V. Kudják","doi":"10.1109/RADIOELEK.2010.5478553","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2010.5478553","url":null,"abstract":"In this paper, we present some results of computer simulations oriented on frequency and noise properties of an active RC notch filter (ARCN filter), which is intended to provide high reference spur suppression in the phase detector output voltage of PLL. In this paper also has been presented the substitution of complicated active ARC structure with the simple passive RLC filter. On the base numerical simulations results it is possible to design good ARCN filters with small phase shift within active PLL bandwidth.","PeriodicalId":398720,"journal":{"name":"20th International Conference Radioelektronika 2010","volume":"86 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127988822","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: 1
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