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A Novel Active Spectrum Sensing Scheme for Cognitive MB-OFDM UWB Radio 一种新的认知MB-OFDM超宽带无线电主动频谱感知方案
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562529
Qi Liu, Luyong Zhang, Zheng Zhou, Y. Ye
{"title":"A Novel Active Spectrum Sensing Scheme for Cognitive MB-OFDM UWB Radio","authors":"Qi Liu, Luyong Zhang, Zheng Zhou, Y. Ye","doi":"10.1109/CROWNCOM.2008.4562529","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562529","url":null,"abstract":"Spectrum awareness is the key technique for Cognitive Radio (CR). A special spectrum sensing scheme is necessary for Cognitive UWB radio (CUWB) because of its lower radio power and ultra wide bandwidth. Although CUWB transmitter and receiver could respectively detect the spectrum holes, they couldn't communicate with each other probably if they are out of the communication range or there isn't common usable spectrum segment for them. No sensing technique deals with these problems properly. In this paper a novel active spectrum sensing scheme for cognitive MB-OFDM UWB radio is presented to settle the above problems. The scheme takes full advantage of UWB and finds usable channels directly for CUWB transmitter and receiver through sending beacon signals and acknowledgement signals. This active spectrum sensing scheme is totally different from existing sensing methods and has its own advantages.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"24 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":"126202832","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
Cognitive Pulse Shaping for M-ary Direct Sequence BPAM UWB System m - m直接序列BPAM超宽带系统的认知脉冲整形
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562498
Zhiquan Bai, D. Yuan, Haixia Zhang, K. Kwak
{"title":"Cognitive Pulse Shaping for M-ary Direct Sequence BPAM UWB System","authors":"Zhiquan Bai, D. Yuan, Haixia Zhang, K. Kwak","doi":"10.1109/CROWNCOM.2008.4562498","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562498","url":null,"abstract":"In this paper, based on a new pulse waveform design algorithm of ultra wideband pulse (Parr et al., 2003), we employ this algorithm into a cognitive M-ary code selected direct sequence bipolar pulse amplitude modulation ultra wideband communication system. This M-ary DS-UWB system can utilize the cognitive waveform to realize the high performance and high data rate cognitive communication. The bit error rate performance of the M-ary system with the novel pulse waveform is presented in this paper. The proposed scheme can be realized under different situations with lower interference to primary wireless devices and acceptable system complexity. Further more, through the pulse design, we can also generate some good candidate waveform sets which satisfy the FCC regulation.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"107 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":"124856272","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
Uplink Distributed Binary Power Allocation for Cognitive Radio Networks 认知无线网络的上行分布式二进制功率分配
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562474
Majed Haddad, A. Hayar, G. Øien, S. G. Kiani
{"title":"Uplink Distributed Binary Power Allocation for Cognitive Radio Networks","authors":"Majed Haddad, A. Hayar, G. Øien, S. G. Kiani","doi":"10.1109/CROWNCOM.2008.4562474","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562474","url":null,"abstract":"Motivated by the desire for efficient spectral utilization, we present a novel algorithm for power allocation for sum rate maximization in cognitive radio context while preserving a guaranteed QoS for the primary network. To this effect, we propose a distributed cognitive radio coordination that maximizes the cognitive radio network (CRN) sum rate while minimizing the interference to the primary users (PU). Our goal is to realize spectrum sharing by optimally allocating secondary users (SU) transmit powers in order to maximize the total SU throughput under interference and noise impairments. Both theoretical and simulation results under realistic wireless network settings are shown to exhibit interesting features in term of CRN deployment while maintaining QoS for the primary system.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"17 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":"125231444","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: 20
Sensing UMTS Bands Using Cyclostationary Features and Cooperation Between Opportunistic Terminals 利用循环平稳特征感知UMTS频带和机会终端之间的合作
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562557
P. Marques, J. Bastos, A. Gameiro
{"title":"Sensing UMTS Bands Using Cyclostationary Features and Cooperation Between Opportunistic Terminals","authors":"P. Marques, J. Bastos, A. Gameiro","doi":"10.1109/CROWNCOM.2008.4562557","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562557","url":null,"abstract":"The Opportunistic Radio (OR) concept relies on the cognitive features of the OR terminals, namely the ability to adapt its transmitter parameters, based upon interaction with the RF environment in which it operates. An OR system operates in licensed frequency bands, exploiting opportunities and operating with a lower priority regarding the licensed system, implementing a spectrum pool mechanism. The most important constraint is that the OR network should always avoid harmful interference with the licensed system, therefore it should reliably detect licensed signals in the used band in order to avoid interfering with the licensed owner of that band. Given the importance of UMTS systems in current wireless communications, this paper is focused on 3G bands and addresses the problem of sensing weak UMTS signals. The proposed sensing algorithm exploits the cyclostationary features of UMTS signals and the cooperation between multiple OR terminals clustered in the OR network.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"39 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":"134208869","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
Parametric Density Estimation Using EM Algorithm for Collaborative Spectrum Sensing 基于EM算法的协同频谱感知参数密度估计
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562449
Shun-Te Tseng, Han-Ting Chiang, J. Lehnert
{"title":"Parametric Density Estimation Using EM Algorithm for Collaborative Spectrum Sensing","authors":"Shun-Te Tseng, Han-Ting Chiang, J. Lehnert","doi":"10.1109/CROWNCOM.2008.4562449","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562449","url":null,"abstract":"Collaborative sensing of spectral occupancy can increase accuracy and relax the required sensitivity of individual sensing units. Collaborative sensing requires knowledge about the densities of collected sensing statistics to form the correct decision statistics for the optimum likelihood ratio test. In this paper, a parametric density estimation scheme using the expectation-maximization (EM) algorithm is proposed to estimate the parameters of densities that are drawn from a given family. When the log-likelihood function for the EM algorithm satisfies a certain condition, the maximization procedure is shown to require only a weighted sum of the collected sensing statistics. Numerical examples show that in various scenarios the proposed EM algorithm produces more accurate estimates than the sample average does.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"1 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":"129830255","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: 3
Misallocation-Averse Policy for Decentralized Resource Allocation in Spectrum Sharing Systems 频谱共享系统中分散资源分配的避免错配策略
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562513
T. Yamada, I. Cosovic, K. Maeda, S. Kaiser
{"title":"Misallocation-Averse Policy for Decentralized Resource Allocation in Spectrum Sharing Systems","authors":"T. Yamada, I. Cosovic, K. Maeda, S. Kaiser","doi":"10.1109/CROWNCOM.2008.4562513","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562513","url":null,"abstract":"It is becoming increasingly difficult to satisfy the growing demands on spectrum with the conventional policy of fixed spectrum allocation. To overcome this problem, flexible and dynamic spectrum sharing methods that can significantly improve utilization of the spectrum have gained increasing interest recently. In this paper, resource allocation in decentralized spectrum sharing systems applying the existing policy rule referred to as \"inequality-averse policy\" is focused on. The problem related to the impact of inaccurate estimation of future traffic demands on the performance of such systems is addressed. To alleviate the problem, a novel policy termed misallocation-averse policy, which introduces adjusting factors and is resistant to such estimation errors, is proposed. The effectiveness of the proposed policy rule is verified through computer simulations.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"3 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":"129983388","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
Methods for Reducing Interference caused to Licensed Systems by Overlay-CSMA/CA Cognitive Radios 减少重叠- csma /CA认知无线电对许可系统干扰的方法
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562472
A. Adamis, K. Maliatsos, P. Constantinou
{"title":"Methods for Reducing Interference caused to Licensed Systems by Overlay-CSMA/CA Cognitive Radios","authors":"A. Adamis, K. Maliatsos, P. Constantinou","doi":"10.1109/CROWNCOM.2008.4562472","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562472","url":null,"abstract":"Cognitive Radios (CR) have recently appeared as a solution to the spectrum scarcity problem, caused by static licensing policies. CRs can utilize spectral opportunities when and where Licensed Systems (LS) remain idle, operating in an overlay mode under the major restriction of not causing harmful interference to them. In this Paper, first, we investigate the IEEE 802.11 DCF behavior in the overlay network, in terms of interference caused to the LS. The importance of the three way hand shake mechanism in the overlay scenario is discovered. Then, we introduce a 3rd state to the carrier sensing mechanism of the CR stations and we extend the DCF functionality by exploiting the new state. Two new protocols that utilize the new mechanism are proposed, both of which achieve substantial reduction in the interference caused to the LS. The second protocol also improves the performance of the CR Network in terms of throughput.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"33 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":"129992715","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
Fuzzy-based Spectrum Handoff in Cognitive Radio Networks 认知无线电网络中基于模糊的频谱切换
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562535
L. Giupponi, A. Pérez-Neira
{"title":"Fuzzy-based Spectrum Handoff in Cognitive Radio Networks","authors":"L. Giupponi, A. Pérez-Neira","doi":"10.1109/CROWNCOM.2008.4562535","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562535","url":null,"abstract":"This paper focuses on spectrum handoffs in a cognitive radio network where secondary (unlisenced) users (i.e. cognitive radios) opportunistically use frequency channels as long as the aggregate interference caused at the primary (licensed) users does not exceed a certain threshold. When harmful interference is caused to a primary user, or when the quality of service perceived by a secondary user is not satisfactory, the secondary user has to initiate a spectrum handoff to quickly vacate the channel it is occupying. The proposal in this paper is a fuzzy-based approach able to make effective spectrum handoff decisions in a context characterized by uncertain, incomplete and heterogeneous information.","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":"129141926","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: 124
Efficient scheme for DOA ESTIMATION of Multipath Clusters in WiMedia UWB systems WiMedia UWB系统中多径簇DOA估计的有效方法
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562553
A. K. Marath, A. R. Leyman, H. K. Garg
{"title":"Efficient scheme for DOA ESTIMATION of Multipath Clusters in WiMedia UWB systems","authors":"A. K. Marath, A. R. Leyman, H. K. Garg","doi":"10.1109/CROWNCOM.2008.4562553","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562553","url":null,"abstract":"UWB systems are expected to find widespread use in future short range applications. Increasing popularity of these devices will require management of occupied spectrum in spatial domain to keep the interference low. In ultra wide band (UWB) communication systems, one encounters many multipath components. By optimally forming beams in the direction of the principal multipath clusters, one can achieve optimum spectrum efficiency. The number of components would depend on the sampling rate as the number of resolvable components depends on it. Besides, many of the multipath components would be coming from the same cluster. The estimation of the direction of arrival (DOA) of these clusters is very useful to focus the transmit power in the optimum direction. A new algorithm, exploiting the known pilot signals of multiband UWB systems for estimation of DOA of clusters is proposed recently. By making use of a new matrix incorporating the cross correlation between the focused UWB signal and the known pilot signal of the transmitted data in each array element, one would be able to separate the multipath clusters from a single source. This paper looks at reducing the number of receivers required for implementing the algorithm. UWB system makes use of the preample to synchronize the incoming data. Hence, one can employ a central processor to sample the data from individual sensors in a time multiplexed fashion. This time multiplexed sampled data can be used for finding the expected value of correlation with known reference data.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"42 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":"116135405","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
Sensor Pooling for Differential Sensing of Active and Idle Channels in Cognitive WPANs 认知无线广域网中主动和空闲信道差分感知的传感器池化
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562560
J. Misic, V. Mišić
{"title":"Sensor Pooling for Differential Sensing of Active and Idle Channels in Cognitive WPANs","authors":"J. Misic, V. Mišić","doi":"10.1109/CROWNCOM.2008.4562560","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562560","url":null,"abstract":"Cognitive radio technology necessitates accurate and timely sensing of the primary users' activity on the chosen set of channels. We assume incomplete sensing, in which the number of sensing nodes is smaller than the number of channels; the results of sensing are cooperatively combined to form a coherent channel map. As the times when spectral opportunities end are more critical for network performance, idle channels should be sensed more frequently than the active ones. The paper presents a probabilistic analysis of this sensing policy, referred to as differential sensing, and investigates the range of values in which such, incomplete sensing is capable of maintaining an accurate view of the status of the working channel set.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"1 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":"128628054","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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