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Orthogonal Beamforming Methodology in Cognitive Radio Networks 认知无线电网络中的正交波束形成方法
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562465
Yangsoo Kwon, Hyeonsu Kim, Jaeho Yoo, Jaehak Chung
{"title":"Orthogonal Beamforming Methodology in Cognitive Radio Networks","authors":"Yangsoo Kwon, Hyeonsu Kim, Jaeho Yoo, Jaehak Chung","doi":"10.1109/CROWNCOM.2008.4562465","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562465","url":null,"abstract":"Cognitive radio technique has been considered as a strong solution of frequency scarcity due to the limitation of frequency resource. In this paper, we propose an orthogonal beamforming methodology which enables cognitive radio systems to coexist with primary users' systems in the same spectrum and region with no interference to the primary users' systems. The orthogonal beams are obtained using Gram-Schmidt orthogonalization based on primary users' channel state information. In addition, to increase the sum-rate of the CR systems, the proposed scheme adopts an opportunistic beamforming method. Numerical results demonstrate that the proposed scheme does not cause interference to the primary users and provides higher sum-rate capacity than that of conventional CR systems.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122077837","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
Double Threshold Energy Detection of Cooperative Spectrum Sensing in Cognitive Radio 认知无线电协同频谱感知的双阈值能量检测
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562451
Jiang Zhu, Zheng-guang Xu, Furong Wang, Benxiong Huang, Bo Zhang
{"title":"Double Threshold Energy Detection of Cooperative Spectrum Sensing in Cognitive Radio","authors":"Jiang Zhu, Zheng-guang Xu, Furong Wang, Benxiong Huang, Bo Zhang","doi":"10.1109/CROWNCOM.2008.4562451","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562451","url":null,"abstract":"Cognitive radio has become an effective theory to solve the inefficiency of the spectrum usage, and cooperative spectrum sensing among the secondary users to detect the primary user accurately is broadly studied before. In this paper, we employ a double threshold method in energy detector to perform spectrum sensing, while a fusion center in the cognitive radio network collects the local decisions and observational values of the secondary users, and then makes the final decision to determine whether the primary user is absence or not. Simulation results will show that the spectrum sensing performance in AWGN channels is improved significantly under the proposed scheme as opposed to the conventional method.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124720107","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: 164
The Spectral Efficiency analysis of the Spectrum Overlay technology of the TV band 电视频段频谱叠加技术的频谱效率分析
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562522
Cha-sik Leem, Jaiyong Lee, Sang-Wu Kim, Chang-Joo Kim, Sung-Chul Kang
{"title":"The Spectral Efficiency analysis of the Spectrum Overlay technology of the TV band","authors":"Cha-sik Leem, Jaiyong Lee, Sang-Wu Kim, Chang-Joo Kim, Sung-Chul Kang","doi":"10.1109/CROWNCOM.2008.4562522","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562522","url":null,"abstract":"In this paper, we discuss the spectral efficiency and coverage efficiency of WRAN (wireless regional area network) system in TV bands which are under standardization at the IEEE 802.22 WG. Instead of spectrum underlay technologies which have been used conventionally, spectrum overlay technology model will be the subject of analysis and simulations in this paper. The research results revealed that the increase of spectral reuse distance (guard distance) negatively affects the spectral and coverage efficiency. In WRAN system that uses spectrum overlay technologies and where the Tx power of TV stations and WRAN BSs are constant, decrease in both of the spectral efficiency and the coverage efficiency were observed in counter-proportion to the increasing guard distance at the size of given area (about 400 to 800 km).","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127902949","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
Adaptive Sensing Threshold Control Based on Transmission Power in Cognitive Radio Systems 认知无线电系统中基于发射功率的自适应感知阈值控制
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562452
Hyun-Ho Choi, Kyunghun Jang, Yoon-Chae Cheong
{"title":"Adaptive Sensing Threshold Control Based on Transmission Power in Cognitive Radio Systems","authors":"Hyun-Ho Choi, Kyunghun Jang, Yoon-Chae Cheong","doi":"10.1109/CROWNCOM.2008.4562452","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562452","url":null,"abstract":"Spectrum sensing is a key enabling technology for cognitive radio. Since there is a tradeoff between the probability of missed detection and the probability of false alarm according to a value of sensing threshold, it is very important to determine the sensing threshold suitable for cognitive radio environments. In this paper, we propose a novel method to determine the sensing threshold in the cognitive radio system, in which the secondary user (SU) first decides its transmission power for the communication and then decides the sensing threshold for the coexistence with the primary user (PU). For the coexistence, the SU controls its sensing threshold adaptively according to its transmission power in order to guarantee the minimum decodable SINR for the primary receiver. The analysis results show that the adaptively controlled sensing threshold decreases both the missed detection and the false alarm simultaneously and so enables both SU and PU to coexist in the same channel without interfering each other.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122495212","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: 60
Prototype of a Cognitive Radio System with Cooperative Sensing and Interference Alerting 具有协同感知和干扰预警的认知无线电系统原型
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562482
M. Matsui, K. Akabane, H. Shiba, K. Uehara
{"title":"Prototype of a Cognitive Radio System with Cooperative Sensing and Interference Alerting","authors":"M. Matsui, K. Akabane, H. Shiba, K. Uehara","doi":"10.1109/CROWNCOM.2008.4562482","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562482","url":null,"abstract":"Cognitive radio systems provide dynamic spectrum access, which is expected to improve frequency use efficiency. These systems need a sensing function to avoid interference from other radio stations. However, it is impossible to completely avoid interference because no perfect sensing function has been developed. To solve this problem, we propose using a new cognitive radio system with three main functions: cooperative sensing, interference alerting, and frequency management. We developed and evaluated a prototype of the system and found that the system is effective.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115542004","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
Blind Spectrum Sensing for Cognitive Radio Based on Model Selection 基于模型选择的认知无线电盲频谱感知
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562448
B. Zayen, A. Hayar, D. Nussbaum
{"title":"Blind Spectrum Sensing for Cognitive Radio Based on Model Selection","authors":"B. Zayen, A. Hayar, D. Nussbaum","doi":"10.1109/CROWNCOM.2008.4562448","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562448","url":null,"abstract":"Cognitive radio devices will be able to seek and dynamically use frequency bands for network access. This will be done by autonomous detection of vacant sub-bands in the radio spectrum. In this paper, we propose a new method for blind detection of vacant sub-bands over the spectrum band. The proposed method exploits model selection tools like Akaike information criterion (AIC) and Akaike weights to sense holes in the spectrum band. Specifically, we assume that the noise of the radio spectrum band can still be adequately modeled using Gaussian distribution. We then compute and analyze Akaike weights in order to decide if the distribution of the received signal fits the noise distribution or not. Our theoretical result are validated using experimental measurements captured by Eurecom RF Agile Platform. Simulations show promising performance results of the proposed technique in terms of sensing vacant sub-bands in the spectrum.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132572961","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: 39
Performance Evaluation of Adaptive Non-contiguous MC-CDMA and Non-contiguous CI/MC-CDMA for Dynamic Spectrum Access 动态频谱接入的自适应非连续MC-CDMA和非连续CI/MC-CDMA性能评价
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562551
Zhiqiang Wu, E. Ratazzi, V. Chakravarthy, Lang Hong
{"title":"Performance Evaluation of Adaptive Non-contiguous MC-CDMA and Non-contiguous CI/MC-CDMA for Dynamic Spectrum Access","authors":"Zhiqiang Wu, E. Ratazzi, V. Chakravarthy, Lang Hong","doi":"10.1109/CROWNCOM.2008.4562551","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562551","url":null,"abstract":"In this paper, we present a quantitative performance evaluation of non-contiguous multi-carrier code vision multiple access (NC-MC-CDMA) for cognitive radio in a dynamic spectrum access (DSA) network. In a DSA network, multi-carrier based cognitive radio transceivers need to deactivate some of its subcarriers to avoid interference to primary users. However, by deactivating subcarriers, orthogonality among different spreading codes are lost, leading to poor BER performance. The performance of the NC-MC-CDMA can be improved by adaptive spreading code adjustment to compensate for the loss of orthogonality. However, since Hadamard-Walsh codes only exist for certain code length, loss of orthogonality can only be minimized instead of eliminated for many cases. On the other hand, orthogonal Carrier Interferometry codes exist for code length of any integer. Hence, by applying non-contiguous CI/MC-CDMA into DSA, the loss of orthogonality among spreading codes caused by deactivating subcarriers can be eliminated. As a direct result, adaptive NC-CI/MC-CDMA significantly outperforms adaptive NC-MC-CDMA using Hadamard-Walsh codes.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128364742","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: 18
White-Space Sensing Device for Detecting Vacant Channels in TV Bands 用于检测电视频带中空闲信道的空白感测装置
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562521
S. W. Oh, N. Syed, Yonghong Zeng, V. P. Kumar, T. C. Le, Karen J. M. Kua, Weiqiang Zhang
{"title":"White-Space Sensing Device for Detecting Vacant Channels in TV Bands","authors":"S. W. Oh, N. Syed, Yonghong Zeng, V. P. Kumar, T. C. Le, Karen J. M. Kua, Weiqiang Zhang","doi":"10.1109/CROWNCOM.2008.4562521","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562521","url":null,"abstract":"Measurements performed at several locations clearly show that frequency spectrum is under-utilized. Cognitive radio is a strong candidate to ensure better spectrum utilization by providing access in an opportunistic manner. Simulations performed on the algorithm that we proposed show promising results in sensing vacant channels in TV bands. Here we present the work, which implements the algorithm on a real-time prototype, and measure its sensing performance in actual environments. Results show that our algorithm is robust under realistic conditions. This confirmation will give much needed confidence in the capability of cognitive radio systems to detect the operation of primary users and protect their use of spectrum.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124617386","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
Application of clustering structure in the hierarchical spectrum sharing network based on cognitive radio 聚类结构在认知无线电分层频谱共享网络中的应用
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562516
L. Gong, Jie Chen, Wanbin Tang, Shaoqian Li
{"title":"Application of clustering structure in the hierarchical spectrum sharing network based on cognitive radio","authors":"L. Gong, Jie Chen, Wanbin Tang, Shaoqian Li","doi":"10.1109/CROWNCOM.2008.4562516","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562516","url":null,"abstract":"This paper firstly analyzes the impact which clustering and non-clustering structure is on sensing spectrum expenditure. Furthermore, the reason that clustering structure is adopted in hierarchical spectrum sharing network is also illustrated by numerical simulation. Secondly, a clustering algorithm, which can reduce detection expenditure, is proposed based on the similarity of the spectrum in such architecture. Additionally, clustering stability based on this algorithm is explored. Theoretical analysis and simulation result indicates that clustering stability is ensured only if threshold K is chosen appropriately.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114742318","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: 11
Early Opportunities for Commercialization of TV Whitespace in the U.S 美国电视空白商业化的早期机遇
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562539
F. Martin, N. Correal, R. Ekl, P. Gorday, R. J. O'Dea
{"title":"Early Opportunities for Commercialization of TV Whitespace in the U.S","authors":"F. Martin, N. Correal, R. Ekl, P. Gorday, R. J. O'Dea","doi":"10.1109/CROWNCOM.2008.4562539","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562539","url":null,"abstract":"We propose the use of IP-based broadband wireless protocols to address many of the applications needs in the Television White Space (TVWS) frequencies that will be available for secondary usage in the U.S. beginning in 2009. The work includes a discussion of TVWS physical and regulatory characteristic and a view of the TVWS usage models that may be applied in various market spaces, including the home, the enterprise, public safety and wireless mobile service providers. We show that a protocol based on IEEE 802.16e or a similar broadband wireless protocol could be adapted to meet many of the needs in this space.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124212847","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: 9
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