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Linearization of power amplifiers by baseband digital predistortion for OFDM transmitters 基于基带数字预失真的OFDM发射机功率放大器线性化
2008 18th International Crimean Conference - Microwave & Telecommunication Technology Pub Date : 2008-11-18 DOI: 10.1109/CRMICO.2008.4676376
D. Bondar, D. Budimir, B. Shelkovnikov
{"title":"Linearization of power amplifiers by baseband digital predistortion for OFDM transmitters","authors":"D. Bondar, D. Budimir, B. Shelkovnikov","doi":"10.1109/CRMICO.2008.4676376","DOIUrl":"https://doi.org/10.1109/CRMICO.2008.4676376","url":null,"abstract":"For the signals with high peak-to-average ratio (PAR), such as WiMax OFDM, power amplifiers need to operate in a compression mode. It results in a nonlinear distortion of the output signal. To compensate for this distortion, linearizers are used. However, they decrease efficiency of amplifiers. This paper proposes to use a digital predistortion of baseband signals, which is characterized by a small impact on efficiency and a good linearizing performance, for linearization of OFDM transmitters. The paper describes design of a baseband predistorter and verifies its performances by WiMax OFDM simulations in ADS. Proposed predistorter brings significant improvements in AM/AM characteristic, eliminates spectrum re-growth, decreases adjacent channel power ratio (ACPR) and error vector magnitude (EVM).","PeriodicalId":328074,"journal":{"name":"2008 18th International Crimean Conference - Microwave & Telecommunication Technology","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121799123","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
Limit cycles in PI control loops with absolute deadband sampling 具有绝对死带采样的PI控制环中的极限环
2008 18th International Crimean Conference - Microwave & Telecommunication Technology Pub Date : 2008-11-18 DOI: 10.1109/CRMICO.2008.4676414
V. Vasyutynskyy, A. Luntovskyy, K. Kabitzsch
{"title":"Limit cycles in PI control loops with absolute deadband sampling","authors":"V. Vasyutynskyy, A. Luntovskyy, K. Kabitzsch","doi":"10.1109/CRMICO.2008.4676414","DOIUrl":"https://doi.org/10.1109/CRMICO.2008.4676414","url":null,"abstract":"Absolute deadband sampling is used in discrete control systems for reduction of the number of produced events. Under proper conditions, this sampling type results in limit cycles in steady state, which lead to increased number of events and deteriorate the sampling efficiency. This paper investigates the condition of emergence of limit cycles in the closed control loops with PI controllers, as well as the frequency of limit cycles.","PeriodicalId":328074,"journal":{"name":"2008 18th International Crimean Conference - Microwave & Telecommunication Technology","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122280698","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: 16
Chaotic MW signal responces in a self-oscillatory system with the nonlinear magnetostatic wave transmission line 非线性静磁波传输线自振荡系统的混沌毫瓦信号响应
2008 18th International Crimean Conference - Microwave & Telecommunication Technology Pub Date : 2008-11-18 DOI: 10.1109/CRMICO.2008.4676477
E. N. Beginin, S. Grishin, E.V. Zarkova, Y. Sharaevsky
{"title":"Chaotic MW signal responces in a self-oscillatory system with the nonlinear magnetostatic wave transmission line","authors":"E. N. Beginin, S. Grishin, E.V. Zarkova, Y. Sharaevsky","doi":"10.1109/CRMICO.2008.4676477","DOIUrl":"https://doi.org/10.1109/CRMICO.2008.4676477","url":null,"abstract":"In this paper the spectral, time and statistical responses of the chaotic MW signals are studied on the basis of the experimental data. These signals are generated by the self-oscillatory system with the nonlinear magnetostatic surface wave (MSSW) transmission line. The bifurcation diagram for this system is also calculated.","PeriodicalId":328074,"journal":{"name":"2008 18th International Crimean Conference - Microwave & Telecommunication Technology","volume":"283 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122470384","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
Synchronization and non-autonomous oscillations in microwave generators on virtual cathode 虚阴极微波发生器的同步与非自主振荡
2008 18th International Crimean Conference - Microwave & Telecommunication Technology Pub Date : 2008-11-18 DOI: 10.1109/CRMICO.2008.4676534
I. S. Rempen, A. Hramov
{"title":"Synchronization and non-autonomous oscillations in microwave generators on virtual cathode","authors":"I. S. Rempen, A. Hramov","doi":"10.1109/CRMICO.2008.4676534","DOIUrl":"https://doi.org/10.1109/CRMICO.2008.4676534","url":null,"abstract":"The task of generating high-power microwave signals with controlled characteristics may be fulfilled in the particular case dealing with the systems where the source of output signal is the virtual cathode forming in the electron beam. With the help of natural experiment and numerical modulation it is shown that the preliminary periodical modulation of electron beam helps to achieve synchronization of virtual cathode oscillations to the frequency of controlling signal and also to half of its value.","PeriodicalId":328074,"journal":{"name":"2008 18th International Crimean Conference - Microwave & Telecommunication Technology","volume":"4 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120808821","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
The controlling system of objects under motion 运动物体的控制系统
2008 18th International Crimean Conference - Microwave & Telecommunication Technology Pub Date : 2008-11-18 DOI: 10.1109/CRMICO.2008.4676602
I. Shirokov, E. Ivanova, O. M. Zemlyanukhina
{"title":"The controlling system of objects under motion","authors":"I. Shirokov, E. Ivanova, O. M. Zemlyanukhina","doi":"10.1109/CRMICO.2008.4676602","DOIUrl":"https://doi.org/10.1109/CRMICO.2008.4676602","url":null,"abstract":"The analysis of work of controlling system on devices under motion is discussed. The devices of wireless transmission and reception of information are developed. Calculation of microstrip antenna and analysis of its work are considered.","PeriodicalId":328074,"journal":{"name":"2008 18th International Crimean Conference - Microwave & Telecommunication Technology","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126944670","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
About one of the possible mechanisms of realisation of superradiance operations in the relativistic BWO and TWT 讨论了相对论BWO和行波管实现超辐射操作的可能机制之一
2008 18th International Crimean Conference - Microwave & Telecommunication Technology Pub Date : 2008-11-18 DOI: 10.1109/CRMICO.2008.4676341
A. A. Kurayev, A. K. Sinitsyn
{"title":"About one of the possible mechanisms of realisation of superradiance operations in the relativistic BWO and TWT","authors":"A. A. Kurayev, A. K. Sinitsyn","doi":"10.1109/CRMICO.2008.4676341","DOIUrl":"https://doi.org/10.1109/CRMICO.2008.4676341","url":null,"abstract":"One of possible mechanisms of super-radiance in the relativistic the BWO and TWT based on interaction of an impulse of an electronic pulse pro-modulated on an accelerating voltage with the sectionalized and irregular slow-wave system surveyed. Calculation and optimization on efficiency of parameters of section of the irregular slow-wave system in which there is an accumulation of energy at interaction of an electronic beam to a short electromagnetic impulse is carried out are completed.","PeriodicalId":328074,"journal":{"name":"2008 18th International Crimean Conference - Microwave & Telecommunication Technology","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131386631","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
An open resonator for measurements of the strongly absorbing substances 用于测量强吸收物质的开式谐振器
2008 18th International Crimean Conference - Microwave & Telecommunication Technology Pub Date : 2008-11-18 DOI: 10.1109/CRMICO.2008.4676468
I. Kuzmichev, A. Poyedinchuk, A. Popkov
{"title":"An open resonator for measurements of the strongly absorbing substances","authors":"I. Kuzmichev, A. Poyedinchuk, A. Popkov","doi":"10.1109/CRMICO.2008.4676468","DOIUrl":"https://doi.org/10.1109/CRMICO.2008.4676468","url":null,"abstract":"Bubnov-Galerkin method is applied for simulation of electromagnetic processes in open resonator exited by open circular waveguide located in the center of plane reflector; the second reflector has the spherical shape. The obtained results are promising for application of proposed resonant cell for the study of electromagnetic properties of materials with high losses.","PeriodicalId":328074,"journal":{"name":"2008 18th International Crimean Conference - Microwave & Telecommunication Technology","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122853584","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: 2
Active microstrip directional filter of traveling-wave 有源微带行波定向滤波器
2008 18th International Crimean Conference - Microwave & Telecommunication Technology Pub Date : 2008-11-18 DOI: 10.1109/CRMICO.2008.4676464
E. Glushechenko
{"title":"Active microstrip directional filter of traveling-wave","authors":"E. Glushechenko","doi":"10.1109/CRMICO.2008.4676464","DOIUrl":"https://doi.org/10.1109/CRMICO.2008.4676464","url":null,"abstract":"A multi functional model of microstrip devices with a travelling-wave ring resonator has been proposed. There were drawn a comparison of the characteristics of the devices coming out of the proposed and classic models. Their adequacy has been confirmed that allows to consider this model a multifunctional one.","PeriodicalId":328074,"journal":{"name":"2008 18th International Crimean Conference - Microwave & Telecommunication Technology","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123013652","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
Ku-band dielectric resonator filters ku波段介电谐振器滤波器
2008 18th International Crimean Conference - Microwave & Telecommunication Technology Pub Date : 2008-11-18 DOI: 10.1109/CRMICO.2008.4676463
A. Bunin, S. Vishnyakov, V. Gevorkyan, J. A. Kazantsev, S. Mikhalin, V. Polukarov
{"title":"Ku-band dielectric resonator filters","authors":"A. Bunin, S. Vishnyakov, V. Gevorkyan, J. A. Kazantsev, S. Mikhalin, V. Polukarov","doi":"10.1109/CRMICO.2008.4676463","DOIUrl":"https://doi.org/10.1109/CRMICO.2008.4676463","url":null,"abstract":"The principles and results of the design of microwave Ku-band band-pass filters on dielectric resonators (DR) are discussed. Designed 7-pole filters with waveguide connectors have insertion losses less than 2.0 dB at 1.2...1.5% pass-band, 3.5...4.5% pass-band at -80 dB level and over 80 dB suppression within 1.6 GHz stop-band above central frequency. Filter sizes are 65times38times38 mm, weight-150 g (filter is made of brass).","PeriodicalId":328074,"journal":{"name":"2008 18th International Crimean Conference - Microwave & Telecommunication Technology","volume":"263 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121151555","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
Compact radiator for microwave hyperthermia 用于微波热疗的紧凑型散热器
2008 18th International Crimean Conference - Microwave & Telecommunication Technology Pub Date : 2008-11-18 DOI: 10.1109/CRMICO.2008.4676634
V. Dakhov, V. Katrich, M. Nesterenko
{"title":"Compact radiator for microwave hyperthermia","authors":"V. Dakhov, V. Katrich, M. Nesterenko","doi":"10.1109/CRMICO.2008.4676634","DOIUrl":"https://doi.org/10.1109/CRMICO.2008.4676634","url":null,"abstract":"The problem of electromagnetic waves radiation by the system of crossed curvature vibrators, located over perfectly conducting plane, into flat-layered medium with losses, modeling biological tissue of a man, has been solved using finite element method. The plots for the distribution of the electrical field amplitudes in different layers depending on the difference of vibrators excitation phases are represented.","PeriodicalId":328074,"journal":{"name":"2008 18th International Crimean Conference - Microwave & Telecommunication Technology","volume":"234 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121263961","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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