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

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Grouping technique for cooperative spectrum sensing in cognitive radios 认知无线电协同频谱感知的分组技术
2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management Pub Date : 2009-05-18 DOI: 10.1109/COGART.2009.5167238
Rizwan Akhtar, A. Rashdi, A. Ghafoor
{"title":"Grouping technique for cooperative spectrum sensing in cognitive radios","authors":"Rizwan Akhtar, A. Rashdi, A. Ghafoor","doi":"10.1109/COGART.2009.5167238","DOIUrl":"https://doi.org/10.1109/COGART.2009.5167238","url":null,"abstract":"Cognitive networks can potentially solve the problems of spectrum scarcity by accommodating unlicensed (secondary) users in under-utilized segments of the spectrum. Spectrum sensing serves as the primary stimulus for a cognitive radio and is vitally important for ensuring that the unlicensed users do not offer intolerable levels of interference to licensed (primary) users. Cooperative spectrum sensing provides the capability to cognitive networks to overcome problems related to “hidden” primary users. In this paper, we present a novel technique that takes advantage of cooperative diversity to establish clustering among cooperating secondary users. This technique is then extended to group-based spectrum sensing to establish a tasking mechanism. The technique ensures enhanced agility that will result in a reduction of interference to primary users through their early detection.","PeriodicalId":154100,"journal":{"name":"2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management","volume":"72 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":"114730411","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
Analysis and performance comparison of different cognitive radio algorithms 不同认知无线电算法的分析与性能比较
2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management Pub Date : 2009-05-18 DOI: 10.1109/COGART.2009.5167247
A. Giorgetti, M. Varrella, M. Chiani
{"title":"Analysis and performance comparison of different cognitive radio algorithms","authors":"A. Giorgetti, M. Varrella, M. Chiani","doi":"10.1109/COGART.2009.5167247","DOIUrl":"https://doi.org/10.1109/COGART.2009.5167247","url":null,"abstract":"In this work, we provide performance analysis and comparison for three different cognitive radio (CR) strategies, namely, interwave, underlay, and overlay in a scenario with a primary communication in the presence of a secondary one. We investigate the three different spectrum sharing techniques in terms of theoretical limits represented by capacity achievable by the cognitive user, assuming power constraints and additive white Gaussian noise (AWGN) channel. The closed-form derivation of the capacity shows the impact of scenario and transmission parameters on the two coexisting systems and allows to choose the best CR strategy.","PeriodicalId":154100,"journal":{"name":"2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management","volume":"53 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":"128530689","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
Multi-operator resource sharing scenario in the context of IMT-Advanced systems IMT-Advanced系统下的多运营商资源共享场景
2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management Pub Date : 2009-05-18 DOI: 10.1109/COGART.2009.5167225
A. Mihovska, F. Meucci, N. Prasad, F. J. Velez, O. Cabral
{"title":"Multi-operator resource sharing scenario in the context of IMT-Advanced systems","authors":"A. Mihovska, F. Meucci, N. Prasad, F. J. Velez, O. Cabral","doi":"10.1109/COGART.2009.5167225","DOIUrl":"https://doi.org/10.1109/COGART.2009.5167225","url":null,"abstract":"This paper investigates and proposes a framework for the efficient integration of functionalities for dynamic spectrum use (e.g., spectrum aggregation) and cooperative radio resource management (RRM) in the scope of IMT-Advanced (IMT-A) candidate systems. The envisaged technical solution is based on a joint centralized and distributed approach for both intra-and inter-operator scenarios. Spectrum assignment decisions benefit from a distributed approach that can be realized by the pooling of resources at higher layers together. The paper investigates the possible interworking between the two techniques for the benefits of achieving higher performance and capacity gains. Based on the proposed framework, operators will be able to demand portions of the spectrum for a certain time period and coordinate this action with the actual network loads. The framework is described in terms of functionalities, physical entities, and mutual interactions. The proposed integrated framework can reduce the CAPEX and OPEX during the deployment of IMT-A systems.","PeriodicalId":154100,"journal":{"name":"2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management","volume":"18 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":"124130738","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: 15
An improved simulation of HF channel with Gaussian random time delays and doppler shifts 具有高斯随机时延和多普勒频移的高频信道的改进仿真
2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management Pub Date : 2009-05-18 DOI: 10.1109/COGART.2009.5167246
Yang Guo, Ke Wang
{"title":"An improved simulation of HF channel with Gaussian random time delays and doppler shifts","authors":"Yang Guo, Ke Wang","doi":"10.1109/COGART.2009.5167246","DOIUrl":"https://doi.org/10.1109/COGART.2009.5167246","url":null,"abstract":"An improved high frequency (HF) channel model with random time-delays and random frequency shifts is proposed, on the basis of Watterson model. A software HF channel simulator is implemented using the proposed model. The frequency domain method is used to design the low-pass linear filter that generates the complex baseband tap-gain function with Gaussian spectrum density, representing the Doppler spread of HF channel. The time-delays and Doppler frequency shifts are both modeled as random variables with Gaussian distributed function. Simulation results prove the validity of the proposed HF channel simulator and provide some new insight into the time-varying properties of the HF channel. The proposed model can be used into the simulation of adaptive HF communication system and is much helpful to the design of hardware-based simulator.","PeriodicalId":154100,"journal":{"name":"2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management","volume":"100 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":"121611356","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
PAPR variations on dynamic spectrum access in Cognitive Radio systems 认知无线电系统中动态频谱接入的PAPR变化
2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management Pub Date : 2009-05-18 DOI: 10.1109/COGART.2009.5167244
S. Hussain, Y. Louét, J. Palicot
{"title":"PAPR variations on dynamic spectrum access in Cognitive Radio systems","authors":"S. Hussain, Y. Louét, J. Palicot","doi":"10.1109/COGART.2009.5167244","DOIUrl":"https://doi.org/10.1109/COGART.2009.5167244","url":null,"abstract":"SoftWare Radio (SWR) is an enabling technology for Cognitive Radio (CR) systems which promises to (de) modulate any signal, at any frequency. SWR signal, therefore, is composed of different standard's signals and this combination leads to high temporal fluctuations and thus SWR signal inherits high Peak to Average Power Ratio (PAPR). Non-linear analogue components (amplifiers, converters etc.) cause distortions for high PAPR signals which result in system performance degradation. Usually PAPR problem is addressed in time domain while this paper presents frequency domain interpretation of PAPR which is more appropriate in CR dynamic spectrum access context. A new PAPR formulation is presented which depends only upon spectral values of the signal thus associates spectrum with PAPR. As a result this vision assists in spectrum access for CR systems by providing PAPR metric information related to any available bandwidth. Consequently, bandwidth allocation in a spectrum access scenario under PAPR constraint is simplified.","PeriodicalId":154100,"journal":{"name":"2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management","volume":"52 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":"121426204","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
Capacity improvement of high density wireless LAN networks using adaptive directional antenna 利用自适应定向天线提高高密度无线局域网网络容量
2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management Pub Date : 2009-05-18 DOI: 10.1109/COGART.2009.5167230
M. Umehira, R. Matsuoka
{"title":"Capacity improvement of high density wireless LAN networks using adaptive directional antenna","authors":"M. Umehira, R. Matsuoka","doi":"10.1109/COGART.2009.5167230","DOIUrl":"https://doi.org/10.1109/COGART.2009.5167230","url":null,"abstract":"This paper evaluates capacity improvement of high density wireless LAN networks using adaptive directional antenna, in terms of channel capacity and system capacity based on IEE802.11a OFDM PHY with CSMA based MAC protocol. Simulation results show that the utilization of adaptive directional antenna increases channel and system capacity and the improvement becomes large as the AP deployment density becomes scarcer. In addition, this paper compares two adaptive directional antenna control schemes, i.e. directivity tracking scheme and directivity switching scheme, and reveals that the directivity switching scheme achieves almost the equivalent channel and system capacity improvement as the directivity tracking scheme.","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":"121450387","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
Interference aggregation and sensing in cognitive radio networks 认知无线电网络中的干扰聚合与感知
2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management Pub Date : 2009-05-18 DOI: 10.1109/COGART.2009.5167239
A. Ghasemi
{"title":"Interference aggregation and sensing in cognitive radio networks","authors":"A. Ghasemi","doi":"10.1109/COGART.2009.5167239","DOIUrl":"https://doi.org/10.1109/COGART.2009.5167239","url":null,"abstract":"Dynamic spectrum access is deemed capable of resolving the spectrum scarcity by allowing unlicensed users to opportunistically utilize the white spaces across the licensed spectrum on a non-interfering basis. Cognitive radio networks offer a promising realization of this novel paradigm, thanks to their ability to autonomously identify the white spaces through spectrum sensing. Implementation of such networks, however, requires a model translating the regulatory constraint on the aggregate interference to the system- and device-level design parameters. In this paper a statistical model of interference aggregation in spectrum-sensing cognitive radio networks is developed. In particular, distribution of the aggregate interference is characterized in terms of parameters such as sensitivity, transmitted power, and density of the cognitive radios as well as the underlying propagation environment. The model is further extended to account for the effect of cooperative spectrum sensing on the distribution of the aggregate interference.","PeriodicalId":154100,"journal":{"name":"2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management","volume":"16 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":"131696469","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
On distributed functionalities for cognitive radio 关于认知无线电的分布式功能
2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management Pub Date : 2009-05-18 DOI: 10.1109/COGART.2009.5167228
C. Wijting, Andreas Richter, J. Junell
{"title":"On distributed functionalities for cognitive radio","authors":"C. Wijting, Andreas Richter, J. Junell","doi":"10.1109/COGART.2009.5167228","DOIUrl":"https://doi.org/10.1109/COGART.2009.5167228","url":null,"abstract":"This paper investigates different functionalities that are needed in cognitive radio systems. Cognitive radio systems have the ability to observe their surrounding, become of aware of the particular needs in that surrounding and can adjust their operation to those needs. The paper presents a basic toolbox of functions that are needed to allow for basic cognition and a framework (extended toolbox) of more advanced functions that allow more advanced levels of awareness. The paper stresses the need for the development of a generic architecture that encompassed both centralized and decentralized elements. The centralized elements allow for coordination over larger areas, whereas the decentralized elements allow the exploitation of the radio spectrum in an opportunistic manner as a local resource.","PeriodicalId":154100,"journal":{"name":"2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management","volume":"31 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":"129390675","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
Providing statistical quality-of-service guarantees in cognitive radio networks with cooperation 在协作的认知无线网络中提供统计服务质量保障
2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management Pub Date : 2009-05-18 DOI: 10.1109/COGART.2009.5167224
Shao-Yu Lien, N. Prasad, Kwang-Cheng Chen, Chih-Wei Su
{"title":"Providing statistical quality-of-service guarantees in cognitive radio networks with cooperation","authors":"Shao-Yu Lien, N. Prasad, Kwang-Cheng Chen, Chih-Wei Su","doi":"10.1109/COGART.2009.5167224","DOIUrl":"https://doi.org/10.1109/COGART.2009.5167224","url":null,"abstract":"Cognitive radios (CRs) opportunistically sharing the wireless spectrum with the legacy primary system (PS) are promising to improve the spectrum utilization. However, this cognitive spectrum hole access makes the bandwidth of the cognitive radio network (CRN) formed by multiple CRs varies severely, which makes providing quality-of-service (QoS) guarantee over the CRN a very challenging task. Considering cooperative diversity with the merit of alleviating bandwidth variation, this paper proposes a cooperative scheduling algorithm for the CR in the CRN to select a relay path with the lowest packet dropping probability for packet transmissions. Under this scheme, the upper bounds of the mean packet dropping probability have been analytically derived and the corresponding admission control mechanism is further proposed. Analytical results show that the proposed scheme provides a better QoS guarantee than direct transmissions without cooperative relay for the CRN. Simulation results also confirm that traffic sources admitted into the system can absolutely meet their mean packet dropping probability requirements.","PeriodicalId":154100,"journal":{"name":"2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management","volume":"1983 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":"130543177","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: 24
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