发布求助
文献互助 智能选刊 最新文献

2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management最新文献

筛选
英文 中文
Phase noise effects on the performance of Wavelet Packet Multi-Carrier Modulation 相位噪声对小波包多载波调制性能的影响
2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management Pub Date : 2009-05-18 DOI: 10.1109/COGART.2009.5167231
D. Karamehmedovic, M. Lakshmanan, H. Nikookar
{"title":"Phase noise effects on the performance of Wavelet Packet Multi-Carrier Modulation","authors":"D. Karamehmedovic, M. Lakshmanan, H. Nikookar","doi":"10.1109/COGART.2009.5167231","DOIUrl":"https://doi.org/10.1109/COGART.2009.5167231","url":null,"abstract":"Wavelet Packet based Multi-Carrier Modulation (WPMCM) offers an alternative to the well-established OFDM as an efficient multicarrier modulation technique. It has strong advantage of being a generic transmission scheme whose actual characteristics can be widely customized to fulfill several requirements and constraints of an advanced communication systems. However, a few research questions remain to be addressed before the novel WPMCM can be used in practice. One of the major concerns is the performance of WPMCM transceivers in the presence of analogue radio frequency front-end imperfections. In this paper we analyze the impact of interference in WPMCM transmission caused by phase noise. The sensitivity of WPMCM transceivers to these errors using standard wavelets is evaluated through simulation studies and their performances are compared and contrasted with OFDM.","PeriodicalId":154100,"journal":{"name":"2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management","volume":"148 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132500873","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
NC-OSDM transmission for ICI cancelation in high speed mobile systems 高速移动系统中消除ICI的NC-OSDM传输
2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management Pub Date : 2009-05-18 DOI: 10.1109/COGART.2009.5167232
Chao Zhang, Han Han, Huang Yu
{"title":"NC-OSDM transmission for ICI cancelation in high speed mobile systems","authors":"Chao Zhang, Han Han, Huang Yu","doi":"10.1109/COGART.2009.5167232","DOIUrl":"https://doi.org/10.1109/COGART.2009.5167232","url":null,"abstract":"Non-Contiguous Orthogonal Frequency Division Multiplexing (NC-OFDM) system is used in the wide-band communications, especially for the wide-band cognitive radio, e. g., IEEE 802.22. However, in the high speed mobile environment, NC-OFDM suffers from Inter-Carrier Interference (ICI). Due to the non-uniformed Doppler spread in the wide-band, it is not efficient to use the traditional ICI cancelation schemes. In this paper, the NC-OSDM transmission system is proposed for ICI cancelation under this circumstance. With the performance evaluation, NC-OSDM outperforms over the equivalent NC-OFDM 15dB in the power of ICI interference. Also, the mobile speed of the vehicles or aircrafts can be improved approximately about twice.","PeriodicalId":154100,"journal":{"name":"2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133966144","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
A fair cognitive Channel Allocation method for cellular networks 一种面向蜂窝网络的公平认知信道分配方法
2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management Pub Date : 2009-05-18 DOI: 10.1109/COGART.2009.5167249
Sunav Choudhary, Shaunak Mishra, Nachiket Desai, N. Swathi Priya, D. Chudasama, R. V. Rajakumar
{"title":"A fair cognitive Channel Allocation method for cellular networks","authors":"Sunav Choudhary, Shaunak Mishra, Nachiket Desai, N. Swathi Priya, D. Chudasama, R. V. Rajakumar","doi":"10.1109/COGART.2009.5167249","DOIUrl":"https://doi.org/10.1109/COGART.2009.5167249","url":null,"abstract":"Rapid growth in the consumer base for mobile services against the backdrop of limited spectrum demands intelligent networks for optimum utilization of the allocated spectrum with minimal changes in the existing infrastructure. This paper introduces a novel three stage predictive channel allocation scheme called Intelligent Channel Allocation (ICA) based on long term call statistics, instantaneous call statistics and event driven decisions supported by cognitive radio techniques for an opportunistic but fair usage of spectrum. The scheme realizes a trade-off between enhanced spectrum utilization in moderate call traffic conditions and fast response to emergency situations modeled by a step input in call attempts. Experimental simulations show that the proposed scheme is superior to the existing schemes in emergency situations while providing a comparable performance with the existing hybrid channel allocation schemes at moderate call traffic levels making it very relevant for unforeseen situations.","PeriodicalId":154100,"journal":{"name":"2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130420610","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
Fine time tracking from coarse timing estimation in OFDM systems OFDM系统中基于粗定时估计的精细时间跟踪
2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management Pub Date : 2009-05-18 DOI: 10.1109/COGART.2009.5167233
Adan Toril-Cabrera, E. Martos-Naya, F. J. López-Martínez, J. T. Entrambasaguas
{"title":"Fine time tracking from coarse timing estimation in OFDM systems","authors":"Adan Toril-Cabrera, E. Martos-Naya, F. J. López-Martínez, J. T. Entrambasaguas","doi":"10.1109/COGART.2009.5167233","DOIUrl":"https://doi.org/10.1109/COGART.2009.5167233","url":null,"abstract":"A fine time tracking system is presented for orthogonal frequency division multiplexing (OFDM) systems working in multipath fading channels. Due to the channel variability, coarse timing is the most common sampling synchronization level performed in these environments. However, in case of slow time variant channels, fine time tracking can help in some way to the channel equalization, improving the system performance. For this purpose, a fine time tracker with timing error detection schemes based on the symbol synchronization algorithms will be analyzed. Finally, the obtained results are compared with the performance of coarse time tracking systems.","PeriodicalId":154100,"journal":{"name":"2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130197704","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
Combined wideband and narrowband signal detection for spectrum sensing 用于频谱感知的宽带和窄带联合信号检测
2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management Pub Date : 2009-05-18 DOI: 10.1109/COGART.2009.5167240
J. Lehtomaki, J. Vartiainen, M. Juntti
{"title":"Combined wideband and narrowband signal detection for spectrum sensing","authors":"J. Lehtomaki, J. Vartiainen, M. Juntti","doi":"10.1109/COGART.2009.5167240","DOIUrl":"https://doi.org/10.1109/COGART.2009.5167240","url":null,"abstract":"In spectrum sensing, the goal is to detect the presence of the primary user and to avoid the spectrum utilized by it. The localization algorithm based on double-thresholding (LAD) is a recent method for detecting and localizing signals without a priori knowledge of the noise power. The LAD method performs the best when detecting narrowband (NB) signals. For complete spectrum sensing, detecting just the NB signals is not enough, as the primary user's signal may equally well be a wideband (WB) signal. We propose combining the LAD method with the maximum-minimum eigenvalue (MME) method. The results indicate that the combined method is able to detect both the NB and WB signals without knowledge of the noise power.","PeriodicalId":154100,"journal":{"name":"2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132987614","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: 4
Enriching Cognitive Radio: Reaching beyond secondary spectrum access 丰富认知无线电:超越二次频谱接入
2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management Pub Date : 2009-05-18 DOI: 10.1109/COGART.2009.5167242
A. Attar, O. Holland, A. Hamid Aghvami
{"title":"Enriching Cognitive Radio: Reaching beyond secondary spectrum access","authors":"A. Attar, O. Holland, A. Hamid Aghvami","doi":"10.1109/COGART.2009.5167242","DOIUrl":"https://doi.org/10.1109/COGART.2009.5167242","url":null,"abstract":"The concept of Cognitive Radio (CR) has been established for approximately a decade. It is, however, only recently finding its way to realization, facilitated by regulatory relaxation and advances in technology including greater radio tuneability and adaptability through techniques such as software defined/controlled radio. In its short lifetime, CR has experienced a number of different visions as to the epoch of its capability. As opposed to the recent implicit assumption of CR as merely involving intelligent secondary (opportunistic) spectrum access, here we attempt to revive the appetite for more intricate views of its purpose, thereby introducing some of our own concepts. We evaluate some of these concepts, and show significant potential for performance and efficiency enhancement through them.","PeriodicalId":154100,"journal":{"name":"2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115435113","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
Measurement studies of a spectrum sensing algorithm based on double thresholding 一种基于双阈值的频谱感知算法的测量研究
2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management Pub Date : 2009-05-18 DOI: 10.1109/COGART.2009.5167236
J. Lehtomaki, Suvi Salmenkaita, J. Vartiainen, J. Makela, R. Vuohtoniemi, M. Juntti
{"title":"Measurement studies of a spectrum sensing algorithm based on double thresholding","authors":"J. Lehtomaki, Suvi Salmenkaita, J. Vartiainen, J. Makela, R. Vuohtoniemi, M. Juntti","doi":"10.1109/COGART.2009.5167236","DOIUrl":"https://doi.org/10.1109/COGART.2009.5167236","url":null,"abstract":"Welch spectrum estimator may be used for spectrum monitoring and sensing. Conventionally, the detection threshold is set assuming that the noise power is estimated from noise-only samples. The forward consecutive mean excision (FCME) algorithm is a method for automatically making decisions based on the decision variables, without estimation of the noise power a priori. In this paper, we propose the utilization of the FCME algorithm with the Welch spectrum estimator. Additionally, theoretical analysis about asymptotic threshold setting for the FCME algorithm with the Welch spectrum estimator is presented. The localization algorithm based on double-thresholding (LAD) with adjacent cluster combining (ACC) utilizes the FCME algorithm and is very suitable for signal detection. Laboratory and field measurement results with the LAD ACC method are included to study the detectability of different signal types, including a real wireless microphone signal.","PeriodicalId":154100,"journal":{"name":"2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126243858","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: 14
Cognitive radio & networks in the perspective of industrial wireless communications 工业无线通信视角下的认知无线电与网络
2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management Pub Date : 2009-05-18 DOI: 10.1109/COGART.2009.5167227
T. Kaiser, M. Pérez-Guirao, A. Wilzeck
{"title":"Cognitive radio & networks in the perspective of industrial wireless communications","authors":"T. Kaiser, M. Pérez-Guirao, A. Wilzeck","doi":"10.1109/COGART.2009.5167227","DOIUrl":"https://doi.org/10.1109/COGART.2009.5167227","url":null,"abstract":"Industrial wireless applications typically operate in heterogeneous network environments and require high reliability and strictly guaranteed low latency at moderate data rates. In this contribution we provide an insight into present industrial wireless communication standards and identify the challenges they will have to accomplish in order to achieve business success. We concentrate on the coexistence problem among heterogeneous collocated wireless networks, originated from the ever-increasing demand for spectrum in license exempt bands. We argue that the cognitive radio & networks paradigm has the potential to solve these problem by allowing for near real-time, efficent, and fair radio resource management. So, the next step is to concetrate on the design of flexible and agile radio resource allocation protocols capable to coordinate the conflicting spectrum interest of heterogeneous users. The comprehensive study of heterogeneous, conflicting, cognitive systems (radios or networks) demand powerful analysis and simulation tools. We present game theory as a broadly accepted analytical framework and introduce our parallel distributed simulation engine which is able to cope with the high computational complexity of such problems.","PeriodicalId":154100,"journal":{"name":"2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129806862","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
Bootstrapping the spectrum in ultra wide-band cognitive radio networks 超宽带认知无线电网络中的频谱引导
2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management Pub Date : 2009-05-18 DOI: 10.1109/COGART.2009.5167243
Loredana Arienzo
{"title":"Bootstrapping the spectrum in ultra wide-band cognitive radio networks","authors":"Loredana Arienzo","doi":"10.1109/COGART.2009.5167243","DOIUrl":"https://doi.org/10.1109/COGART.2009.5167243","url":null,"abstract":"The ultra wide-band cognitive radio networks, in recent years, have attracted the attention of the research due to their challenges concerning the signals detection over multiband. The aim of this paper is to address the ultra wide-band spectrum sensing, i.e. to detect the existence of spectral holes in ultra-wide frequency bands in order to improve the spectrum utilization and minimize the interference to the primary communications. Because of channel fading, the detection by one cognitive radio (CR) receiver is subject to missed detection, therefore it is instrumental for a network of spatially diverse CRs to collaborate during the spectrum sensing. In this paper, the collaborative detection is performed and the decentralized decision is discussed. A new paradigm for the decentralized decision based on bootstrap sampling in the spatio-frequency domain is presented. The performance of the proposed spectrum sensing approach for ultra wideband cognitive radio networks is also investigated.","PeriodicalId":154100,"journal":{"name":"2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management","volume":"1 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125966278","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
Sensing of transmission opportunities at the Medium Access Control layer for cognitive radio networks 认知无线网络媒介访问控制层传输机会的感知
2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management Pub Date : 2009-05-18 DOI: 10.1109/COGART.2009.5167251
Nikhil Kundargi, A. Tewfik
{"title":"Sensing of transmission opportunities at the Medium Access Control layer for cognitive radio networks","authors":"Nikhil Kundargi, A. Tewfik","doi":"10.1109/COGART.2009.5167251","DOIUrl":"https://doi.org/10.1109/COGART.2009.5167251","url":null,"abstract":"Detection of transmission opportunities is the critical part of establishing a cognitive radio network. Traditionally, it is achieved via spectrum sensing carried out at the physical layer to detect unused frequency bands. In this paper, we propose a novel approach to detect transmission opportunities at the Medium Access Control (MAC) layer based on the concept of interference temperature. In this approach, secondary transmissions are overlayed on top of primary transmissions as long as they do not affect the primary transmission. A Transmit Margin is defined and used to quantify the spare capacity in the primary network. We setup a system to estimate and track the Packet Error Rates (PER) and use it as a metric for transmit opportunity detection. A distributed estimation procedure to increase the robustness of the estimate is also proposed for cognitive radio networks. The scope of this hitherto unexplored area of cognitive radios is demonstrated and applied to IEEE 802.11 wireless networks through simulation studies.","PeriodicalId":154100,"journal":{"name":"2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123251494","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信