Pub Date : 2011-04-19DOI: 10.1109/RADIOELEK.2011.5936472
N. Milosevic, Z. Nikolic, B. Dimitrijevic
In this paper we consider performance of a dual hop amplify-and-forward system, with co-channel interference at relay. We consider channel state information assisted system in Nakagami-m channel. The outage probability and the average bit error probability of the system are determined. The influence of the interference, as well as the influence of other system's parameters, such as the fading parameter m and outage probability threshold γth on the system's performance is considered.
{"title":"Performance analysis of dual hop relay link in Nakagami-m fading channel with interference at relay","authors":"N. Milosevic, Z. Nikolic, B. Dimitrijevic","doi":"10.1109/RADIOELEK.2011.5936472","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2011.5936472","url":null,"abstract":"In this paper we consider performance of a dual hop amplify-and-forward system, with co-channel interference at relay. We consider channel state information assisted system in Nakagami-m channel. The outage probability and the average bit error probability of the system are determined. The influence of the interference, as well as the influence of other system's parameters, such as the fading parameter m and outage probability threshold γth on the system's performance is considered.","PeriodicalId":267447,"journal":{"name":"Proceedings of 21st International Conference Radioelektronika 2011","volume":"122 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117337250","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 : 2011-04-19DOI: 10.1109/RADIOELEK.2011.5936400
Emad Ebrahimi, S. Naseh
A fast simulation-based and parasitic-aware LC-VCO optimizer CAD tool, using Elitist Non-dominated Sorting Genetic Algorithm (NSGA-II) is presented. The proposed CAD tool optimizes the power consumption and phase noise of each conventional LC-VCO (e.g. NMOS-only, PMOS-only and complementary), simultaneously. In order to evaluate the fitness of the LC-VCO, the harmonic balance analysis is performed by HSPICE RF and then the optimizer core, implemented in MATLAB, manipulates the fitness and suggests some optimized designs. This CAD tool has the ability to optimize Figure of Merit of each configuration too. Design methodologies and comparison of performance of each structure, based on trade-off curves, are also presented and in a case study the cross-coupled LC-VCOs are optimized for 2.4-GHz central frequency (802.11 IEEE) in a commercial 0.18μm RF-CMOS technology.
{"title":"Investigating the performance of cross-coupled CMOS LC-VCOs using genetic algorithm","authors":"Emad Ebrahimi, S. Naseh","doi":"10.1109/RADIOELEK.2011.5936400","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2011.5936400","url":null,"abstract":"A fast simulation-based and parasitic-aware LC-VCO optimizer CAD tool, using Elitist Non-dominated Sorting Genetic Algorithm (NSGA-II) is presented. The proposed CAD tool optimizes the power consumption and phase noise of each conventional LC-VCO (e.g. NMOS-only, PMOS-only and complementary), simultaneously. In order to evaluate the fitness of the LC-VCO, the harmonic balance analysis is performed by HSPICE RF and then the optimizer core, implemented in MATLAB, manipulates the fitness and suggests some optimized designs. This CAD tool has the ability to optimize Figure of Merit of each configuration too. Design methodologies and comparison of performance of each structure, based on trade-off curves, are also presented and in a case study the cross-coupled LC-VCOs are optimized for 2.4-GHz central frequency (802.11 IEEE) in a commercial 0.18μm RF-CMOS technology.","PeriodicalId":267447,"journal":{"name":"Proceedings of 21st International Conference Radioelektronika 2011","volume":"241 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134299343","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 : 2011-04-19DOI: 10.1109/RADIOELEK.2011.5936482
B. Salski, W. Gwarek, M. Celuch
A finite-difference time-domain method (FDTD) has become an essential tool in the modern engineering and scientific research from RF through THz technology up to optical spectrum. Among many other reasons, it follows from great flexibility as well as competitive computational requirements of the FDTD method when compared to other numerical modeling methods. Nevertheless, market demands are always well ahead of the current computational horizons of the classic FDTD method, prompting development of semi-analytical numerical methods that enable modeling of the most challenging electromagnetic (EM) applications. As an example of those continuing trends, we will recall semi-analytical FDTD solutions for axisymmetrical and periodic structures, both widely addressed in the literature and solvable by the commercial EM simulation tools. It will be shown that a tremendous cut of required computational resources is achievable when the FDTD method is supported by appropriate analytical solutions. Several application examples, like cylindrical corrugated horn antenna, Cassegrain reflectors, photonic crystals and micro-structured telecommunications fibers, will be presented.
{"title":"Semi-analytical FDTD modeling of axisymmetrical and periodic structures","authors":"B. Salski, W. Gwarek, M. Celuch","doi":"10.1109/RADIOELEK.2011.5936482","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2011.5936482","url":null,"abstract":"A finite-difference time-domain method (FDTD) has become an essential tool in the modern engineering and scientific research from RF through THz technology up to optical spectrum. Among many other reasons, it follows from great flexibility as well as competitive computational requirements of the FDTD method when compared to other numerical modeling methods. Nevertheless, market demands are always well ahead of the current computational horizons of the classic FDTD method, prompting development of semi-analytical numerical methods that enable modeling of the most challenging electromagnetic (EM) applications. As an example of those continuing trends, we will recall semi-analytical FDTD solutions for axisymmetrical and periodic structures, both widely addressed in the literature and solvable by the commercial EM simulation tools. It will be shown that a tremendous cut of required computational resources is achievable when the FDTD method is supported by appropriate analytical solutions. Several application examples, like cylindrical corrugated horn antenna, Cassegrain reflectors, photonic crystals and micro-structured telecommunications fibers, will be presented.","PeriodicalId":267447,"journal":{"name":"Proceedings of 21st International Conference Radioelektronika 2011","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121170738","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 : 2011-04-19DOI: 10.1109/RADIOELEK.2011.5936473
B. Dimitrijevic, N. Milosevic, Z. Nikolic
In this paper we propose a reconfigurable multiple bit differential detection algorithm that can be used for the DPSK signal reception in the presence of significant frequency offsets. The analysis shows that the bit error probability of the proposed algorithm is nearly constant in a wide frequency offsets range and equal to the error probability for zero frequency offset. Also, the proposed receiver has better performance than the ordinary differential detection receiver for any frequency offset.
{"title":"Performance improvement of DPSK system using a reconfigurable multiple bit differential detection algorithm in the presence of frequency offset","authors":"B. Dimitrijevic, N. Milosevic, Z. Nikolic","doi":"10.1109/RADIOELEK.2011.5936473","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2011.5936473","url":null,"abstract":"In this paper we propose a reconfigurable multiple bit differential detection algorithm that can be used for the DPSK signal reception in the presence of significant frequency offsets. The analysis shows that the bit error probability of the proposed algorithm is nearly constant in a wide frequency offsets range and equal to the error probability for zero frequency offset. Also, the proposed receiver has better performance than the ordinary differential detection receiver for any frequency offset.","PeriodicalId":267447,"journal":{"name":"Proceedings of 21st International Conference Radioelektronika 2011","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122243516","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 : 2011-04-19DOI: 10.1109/RADIOELEK.2011.5936440
F. Adamec, T. Fryza
This paper describes a novel Packet Triggered Architecture (PTA). This architecture takes advantage of programmable pipeline and parallel processing, which lead to MIMD (Multiple Instruction Multiple Data) architecture. The PTA is composed of two main blocks. The first block is constituted from Functional Units (FUs) and their interconnection network. The instructions in the PTA are composed of instruction packets. Every packet encapsulates a data and route across internal NoC (Network on Chip) to which enables dynamic data flow scheduling. This approach brings a new way of programming, because the programming is done by specifying FUs addresses and functions ports. Using of such a design allows create target hardware like a software application. The main advantages of this approach are that any processor can be emulated in the PTA, its ISA can be extended and special accelerators can be added too. Small loops are created directly inside the PTA and small concurrent Finite State Automats (FSM) can be created inside the PTA. The PTA can be as well used like an abstraction layer to easily design and create special-purpose hardware. There are some advantages in hardware design as well. The PTA does not need any complex instruction decoder. Instructions packets can be only fetched and dispatched to PTA. The PTA as well does not need any complex forwarding logic. The PTA can work as a system with improved reliability as well.
本文提出了一种新的分组触发体系结构(PTA)。该体系结构利用可编程管道和并行处理的优势，形成了多指令多数据(MIMD)体系结构。PTA由两个主要部分组成。第一个块由功能单元(Functional unit, FUs)和它们的互连网络组成。PTA中的指令由指令包组成。每个数据包封装了一个数据和路由，通过内部NoC(芯片网络)实现动态数据流调度。这种方法带来了一种新的编程方式，因为编程是通过指定FUs地址和功能端口来完成的。使用这种设计可以像创建软件应用程序一样创建目标硬件。这种方法的主要优点是可以在PTA中模拟任何处理器，可以扩展其ISA，也可以添加特殊的加速器。直接在PTA内部创建小循环，并且可以在PTA内部创建小型并发有限状态自动机(FSM)。PTA也可以用作抽象层，以便轻松地设计和创建专用硬件。在硬件设计上也有一些优势。PTA不需要任何复杂的指令解码器。指令包只能被提取和分派给PTA。PTA也不需要任何复杂的转发逻辑。PTA可以作为一个系统工作，可靠性也得到了提高。
{"title":"Introduction to the new Packet Triggered Architecture for pipelined and parallel data processing","authors":"F. Adamec, T. Fryza","doi":"10.1109/RADIOELEK.2011.5936440","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2011.5936440","url":null,"abstract":"This paper describes a novel Packet Triggered Architecture (PTA). This architecture takes advantage of programmable pipeline and parallel processing, which lead to MIMD (Multiple Instruction Multiple Data) architecture. The PTA is composed of two main blocks. The first block is constituted from Functional Units (FUs) and their interconnection network. The instructions in the PTA are composed of instruction packets. Every packet encapsulates a data and route across internal NoC (Network on Chip) to which enables dynamic data flow scheduling. This approach brings a new way of programming, because the programming is done by specifying FUs addresses and functions ports. Using of such a design allows create target hardware like a software application. The main advantages of this approach are that any processor can be emulated in the PTA, its ISA can be extended and special accelerators can be added too. Small loops are created directly inside the PTA and small concurrent Finite State Automats (FSM) can be created inside the PTA. The PTA can be as well used like an abstraction layer to easily design and create special-purpose hardware. There are some advantages in hardware design as well. The PTA does not need any complex instruction decoder. Instructions packets can be only fetched and dispatched to PTA. The PTA as well does not need any complex forwarding logic. The PTA can work as a system with improved reliability as well.","PeriodicalId":267447,"journal":{"name":"Proceedings of 21st International Conference Radioelektronika 2011","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131499961","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 : 2011-04-19DOI: 10.1109/RADIOELEK.2011.5936470
V. Kudják, Z. Brezović, M. Murin
In this contribution we will demonstrate an extended-usage two-resonant circuit model of quartz with two LC resonators for numerical computation tuning characteristics. Real crystal resonators contain, besides a dominating resonance, other, unwanted parasitic resonances. Their existence can markedly modify the tune performance chart of the VCXO.
{"title":"A two-resonator quartz model for advanced PC-supported design for a VCXO","authors":"V. Kudják, Z. Brezović, M. Murin","doi":"10.1109/RADIOELEK.2011.5936470","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2011.5936470","url":null,"abstract":"In this contribution we will demonstrate an extended-usage two-resonant circuit model of quartz with two LC resonators for numerical computation tuning characteristics. Real crystal resonators contain, besides a dominating resonance, other, unwanted parasitic resonances. Their existence can markedly modify the tune performance chart of the VCXO.","PeriodicalId":267447,"journal":{"name":"Proceedings of 21st International Conference Radioelektronika 2011","volume":"103 13","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132477450","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 : 2011-04-19DOI: 10.1109/RADIOELEK.2011.5936442
F. Dvořak, J. Diblík, C. Vlcek, O. Wilfert
The paper deals with study of temperature turbulences effect towards the optical beam. The horizontally and vertically polarized optical beams have been studied. The turbulence flux has the vertical direction and the optical beam is propagating through the atmosphere environment with three different states of turbulences. The evaluation of obtained data was done by means of relative variance of optical intensity and refractive index structure parameter computing. The different temperature turbulences rate of effect towards the horizontally and vertically polarized beam has been found.
{"title":"Study of temperature turbulences effect towards linearly polarized optical beam propagating in atmospheric environment","authors":"F. Dvořak, J. Diblík, C. Vlcek, O. Wilfert","doi":"10.1109/RADIOELEK.2011.5936442","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2011.5936442","url":null,"abstract":"The paper deals with study of temperature turbulences effect towards the optical beam. The horizontally and vertically polarized optical beams have been studied. The turbulence flux has the vertical direction and the optical beam is propagating through the atmosphere environment with three different states of turbulences. The evaluation of obtained data was done by means of relative variance of optical intensity and refractive index structure parameter computing. The different temperature turbulences rate of effect towards the horizontally and vertically polarized beam has been found.","PeriodicalId":267447,"journal":{"name":"Proceedings of 21st International Conference Radioelektronika 2011","volume":"382 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123351754","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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