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Spectrum Survey in Singapore: Occupancy Measurements and Analyses 新加坡的频谱调查:占用测量和分析
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562457
H. Islam, C. L. Koh, S. W. Oh, X. Qing, Y. Y. Lai, Cavin Wang, Ying-Chang Liang, B. E. Toh, F. Chin, Geok-Leng Tan, William Toh
{"title":"Spectrum Survey in Singapore: Occupancy Measurements and Analyses","authors":"H. Islam, C. L. Koh, S. W. Oh, X. Qing, Y. Y. Lai, Cavin Wang, Ying-Chang Liang, B. E. Toh, F. Chin, Geok-Leng Tan, William Toh","doi":"10.1109/CROWNCOM.2008.4562457","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562457","url":null,"abstract":"We study the 24-hour spectrum usage pattern in Singapore in the frequency bands ranging from 80 MHz to 5850 MHz. The objectives are to find how the scarce radio spectrum allocated to different services is utilized in Singapore and identify the bands that could be accessed for future opportunistic use due to their low or no active utilization. The results from the spectrum measurements taken over 12 weekday periods reveal that a significant amount of spectrum in Singapore has very low occupancy all the time. The occupancy is quantified as the amount of spectrum detected above a certain received power threshold. The outcome of this study suggests that Singapore has a great potential for employing emerging spectrum sharing technology such as the cognitive radio technology to accommodate enormous demands for future wireless services. However, this study of spectrum survey is preliminary in its nature and future long term studies need to be performed to determine any potential secondary usage on those channels that have low or no active utilization.","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":"115442750","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: 460
Pattern Based Encoding for Cognitive Communication 基于模式的认知沟通编码
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562494
B. Üstündag, O. Orcay
{"title":"Pattern Based Encoding for Cognitive Communication","authors":"B. Üstündag, O. Orcay","doi":"10.1109/CROWNCOM.2008.4562494","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562494","url":null,"abstract":"A new encoding technique based on construction of communication signals with respect to optimal perceptual pattern sensitivity of the cognitive receivers is proposed here. Communication signals are directly generated and adapted according to medium properties without a modulator stage. Receivers recognize signal patterns from a chosen frequency band. These patterns are matched to respecting data sequence within a glossary to recover the information. Our purpose is increasing the bandwidth efficiency via manageable signal to noise ratio. Error free recoverability of the information encoded and carried by multiple pattern combinations in a noisy communication channel is the key factor for this purpose. A pattern based encoding and neural network based decoding technique is used in this study. It is shown that if the predefined communication patterns are appropriately chosen then the transmitted information by multiple sources can be decoded by the receivers in the same time interval, frequency band and location.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"86 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":"116974687","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
Spectrum Sharing by Adaptive Transmit Power Control for Low Priority Systems and its Achievable Capacity 低优先级系统的自适应发射功率控制频谱共享及其可实现容量
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562501
H. Fujii, H. Yoshino
{"title":"Spectrum Sharing by Adaptive Transmit Power Control for Low Priority Systems and its Achievable Capacity","authors":"H. Fujii, H. Yoshino","doi":"10.1109/CROWNCOM.2008.4562501","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562501","url":null,"abstract":"A spectrum sharing method is proposed for the systems which share the same frequency band or adjacent bands with different priorities. The proposed method adaptively controls transmission power according to information offered by high-priority system receivers. We give theoretical capacities achieved by low-priority systems when the proposed method and a conventional method (constant transmit power) are applied. Numerical results confirm that the proposed method attains 1.5-2 times larger capacity than the conventional method.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"153 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":"117208308","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: 10
A Cognitive UWB Testbed Employing Adaptive Pulse Generation 基于自适应脉冲产生的认知超宽带试验台
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562485
N. Choi, J. Hwang, Guanbo Zheng, Ning Han, J. Kim
{"title":"A Cognitive UWB Testbed Employing Adaptive Pulse Generation","authors":"N. Choi, J. Hwang, Guanbo Zheng, Ning Han, J. Kim","doi":"10.1109/CROWNCOM.2008.4562485","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562485","url":null,"abstract":"Ultra wideband (UWB) is an promising underlying method for coexistence among different systems. However, the performance may not be as good as expected due to the changing spectrum environment. Thus, cognitive UWB radio is proposed by taking the advantage of cognition, which enables the radio to learn the spectrum environment by itself. In this paper, we explore a cognitive UWB testbed in physical layer, including cognitive pulse generator, stream view and performance evaluation. In order to protect the potential narrowband systems, the specific mask and channel information are utilized to adapt the system parameters with the help of pulse mask code and pulse generation block. Simulation results show that the proposed testbed is capable to generate the adaptive pulse that suitable for different spectrum environment.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"62 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":"127121858","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
Spectrum-aware Location-based Routing in Cognitive UWB network 认知超宽带网络中基于频谱感知的位置路由
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562508
Fangmin Xu, Luyong Zhang, Zheng Zhou, Y. Ye
{"title":"Spectrum-aware Location-based Routing in Cognitive UWB network","authors":"Fangmin Xu, Luyong Zhang, Zheng Zhou, Y. Ye","doi":"10.1109/CROWNCOM.2008.4562508","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562508","url":null,"abstract":"Cognitive ultra-wideband (UWB) network is the UWB network with the ability of sensing spectrum, detecting the available spectrum holes in primary system, and communicate in the detected spectrum holes. Based on the precise position capability of UWB technology and the spectrum sensing information, local clusters are constructed by neighbor nodes which operated in the same spectrum channel, and the entire network is interconnected by the clusters through bridge gateway nodes. Furthermore, a spectrum-aware routing scheme is provided for clustered cognitive UWB network, which including the process of routing discovery and repairing. The unique feature of this routing scheme is its ability of intelligent adaptation to the change of network and available spectrum resource. Simulation proved the performance of spectrum-aware routing in dynamic spectrum environment is better than traditional routing scheme with fixed spectrum allocation.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"31 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":"125012986","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
Improving Capacity for Wireless Ad Hoc Communications Using Cognitive Routing 利用认知路由提高无线自组织通信容量
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562510
Yiming Liu, D. Grace
{"title":"Improving Capacity for Wireless Ad Hoc Communications Using Cognitive Routing","authors":"Yiming Liu, D. Grace","doi":"10.1109/CROWNCOM.2008.4562510","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562510","url":null,"abstract":"This paper is devoted to the development of cognitive routing techniques for a wireless ad hoc network in order to improve scalability and effectively the supportable capacity. Different routing strategies are examined and a novel capacity-based routing strategy is emphasized. Its capacity performance is evaluated using conventional shortest path routing as a benchmark. It shows the proposed capacity-based routing strategy can reduce the overall interference level in the system by shifting traffic to the edge of the network. It can also support more originating capacity compared with the shortest path routing strategy where each node has a maximum capacity constraint.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"59 25 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":"126836529","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: 26
Detection of White Spaces in a Cognitive Radio Architecture 认知无线电架构中空白区域的检测
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562519
W. Stark, J. P. D. Vries
{"title":"Detection of White Spaces in a Cognitive Radio Architecture","authors":"W. Stark, J. P. D. Vries","doi":"10.1109/CROWNCOM.2008.4562519","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562519","url":null,"abstract":"In this paper we consider the use of UHF spectrum that is not allocated to digital TV transmission for unlicensed wireless devices. We model the propagation conditions and calculate the threshold necessary for detection that results in a small probability of creating interference to TV receivers. The threshold depends on the number of wireless devices. We calculated the reduction in threshold possible when multiple devices cooperate to detect the presence of a TV signal.","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":"116723767","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
Analysis of Aggregated Interference at DTV Receivers in TV Bands 电视频带数字电视接收机的聚合干扰分析
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562541
S. Nandagopalan, C. Cordeiro
{"title":"Analysis of Aggregated Interference at DTV Receivers in TV Bands","authors":"S. Nandagopalan, C. Cordeiro","doi":"10.1109/CROWNCOM.2008.4562541","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562541","url":null,"abstract":"Several efforts are now underway to develop wireless technologies based on cognitive radios (CR) that can operate in the television (TV) band white space. One such example is the IEEE 802.22 Working Group (WG), which is formulating the first worldwide CR-based standard to operate in the TV bands. A mandatory requirement for any wireless technology operating in these bands is that it shall not cause harmful interfere with the passive TV receivers. In this paper we perform a comprehensive analysis of the effect of cumulative interference generated by the IEEE 802.22 system using circular cells and show how geometry plays an important role in the keep-out region. We then generalize our results and derive a generic formula to calculate the keep-out region for a typical deployment and for a variety of technologies.","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":"129069795","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
Cognitive Radio Networks: Enabling New Wireless Broadband Opportunities 认知无线网络:实现新的无线宽带机会
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562540
D. Cavalcanti, M. Ghosh
{"title":"Cognitive Radio Networks: Enabling New Wireless Broadband Opportunities","authors":"D. Cavalcanti, M. Ghosh","doi":"10.1109/CROWNCOM.2008.4562540","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562540","url":null,"abstract":"In this paper, we discuss the regulatory scenario for cognitive radio networks and give an overview of the emerging IEEE 802.22 standard, which is based on a dynamic spectrum access model, and provides new opportunities for wireless broadband access in rural area and remote communities. We discuss the main design challenges for the shared spectrum access model and describe how they are being addressed within the scope of the 802.22 networks. Some of the key design issues include incumbent protection, self-coexistence and spectrum management. We also highlight the new spectrum management model adopted in the 802.22 standard, which can be efficiently used under different regulatory models and rules.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"130 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":"128072068","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: 31
On the Impact of CFO for OFDM Systems with Un-equal Gain Diversity Schemes over Small-term Fading 小周期衰落下非等增益分集OFDM系统CFO的影响
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562552
J. Chen, Chin-Chung Yu, You-Fu Chung, Shi-Han Yan
{"title":"On the Impact of CFO for OFDM Systems with Un-equal Gain Diversity Schemes over Small-term Fading","authors":"J. Chen, Chin-Chung Yu, You-Fu Chung, Shi-Han Yan","doi":"10.1109/CROWNCOM.2008.4562552","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562552","url":null,"abstract":"The system performance of OFDM (orthogonal frequency division multiplexing) with dual branch SC (selection combining) diversity over small scale fading correlated channel is investigated in this paper. The performance of average BER (bit error rate) of the OFDM system is calculated by adopting the results with an alternative expression of the Q-function. The correlated-Weibull fading distribution is applied to characterize the propagation fading channel. Moreover, the assumption of CFO (carrier frequency offset) existing between subcarrier is other scenario considered in this paper. It is worthwhile noting that the system performance of an OFDM system with SC diversity is definitely dominated by transmission environments, that is, except fading parameters (of Weibull distribution) of fading statistics will be the most important reason to decide whether the system performance of an OFDM system is well or not, the CFO is another phaneoman affects the performance too. Furthermore, both of equal and unequal branch gain of the received waveform at the output of SC diversities is assumed in the discussion for OFDM communication systems.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"23 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":"130018805","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
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