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Radar spectrum opportunities for cognitive communications transmission 认知通信传输的雷达频谱机会
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562496
Lingfeng Wang, J. McGeehan, Chris Williams, A. Doufexi
{"title":"Radar spectrum opportunities for cognitive communications transmission","authors":"Lingfeng Wang, J. McGeehan, Chris Williams, A. Doufexi","doi":"10.1109/CROWNCOM.2008.4562496","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562496","url":null,"abstract":"In relation to opportunistic access to radar spectrum, the impact of the radar on a communication system is investigated in this paper. This paper illustrates that by exploring the spatial and temporal opportunities in the radar spectrum and therefore improving the tolerance level to radar interference, a substantial increase on the throughput of a communication system is possible. Results are presented regarding the impact of swept radars on a WiMAX system. The results show the impact of SIR (Received WiMAX signal to received radar signal ratio), radar antenna radiation patterns and rotation period estimation on the feasibility of radar spectrum access.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"222 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":"121646821","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: 23
Pulse Based Adaptive Carrier Waveform Generation for Cognitive Radio Applications 认知无线电应用中基于脉冲的自适应载波波形生成
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562497
M. Manju, A. Premkumar, C. Lau
{"title":"Pulse Based Adaptive Carrier Waveform Generation for Cognitive Radio Applications","authors":"M. Manju, A. Premkumar, C. Lau","doi":"10.1109/CROWNCOM.2008.4562497","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562497","url":null,"abstract":"A radio that is capable of adapting to its environment by continuous learning and observation is called cognitive radio (CR). The developments in DSP and IC technologies catalyze the evolution of this 4G wireless system which makes reliable communication and efficient usage of radio spectrum. To make cognitive radio a reality changes in physical, MAC and network layers of the conventional system is essentially required. The major physical layer issues include wideband front end, intelligent spectrum sensing and adaptive transmission scheme. In our work, we address the adaptive transmission issue and propose a new method. The method is for generating a time domain pulse in radio frequency (RF) range with the required frequency response. The proposed method is compared with existing potential candidates for cognitive radio transmission.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"36 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":"122142767","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
Aggregation Aware Spectrum Assignment in Cognitive Ad-hoc Networks 认知自组织网络中聚合感知频谱分配
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562548
Dawei Chen, Qian Zhang, W. Jia
{"title":"Aggregation Aware Spectrum Assignment in Cognitive Ad-hoc Networks","authors":"Dawei Chen, Qian Zhang, W. Jia","doi":"10.1109/CROWNCOM.2008.4562548","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562548","url":null,"abstract":"Contiguous spectrum assignment generates many small spectrum fragments that cannot be fully utilized, which leads to low spectrum utilization. With the development of advanced wireless radio technology, especially Discontiguous Orthogonal Frequency Division Multiplexing (DOFDM), discontiguous spectrum access and spectrum aggregation in a single radio has become possible. With the help of discontiguous spectrum access, the small spectrum fragments could be aggregated and further utilized, which can dramatically improve the spectrum utilization efficiency. Based on this observation, we propose Aggregation-Aware Spectrum Assignment (AASA), a spectrum assignment algorithm in cognitive ad-hoc networks. In AASA, we propose a spectrum assignment method that takes spectrum aggregation into consideration. Moreover, we prove that AASA optimizes the spectrum assignment and maximizes the number of users that can be supported in the system. Simulation result shows that AASA significantly increases the spectrum assignment efficiency compared with the existing solutions.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"7 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":"125485645","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: 75
Limits on Cognitive Communications in the Wide-band Regime 宽频带下认知通信的限制
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562471
Chulhan Lee, Tie Liu, O. Oyman, S. Vishwanath
{"title":"Limits on Cognitive Communications in the Wide-band Regime","authors":"Chulhan Lee, Tie Liu, O. Oyman, S. Vishwanath","doi":"10.1109/CROWNCOM.2008.4562471","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562471","url":null,"abstract":"This paper studies cognitive communication, where a cognitive transmit-receive pair utilizes an existing (occupied) wide-band spectrum for communication. The cognitive transmitter is assumed to have perfect knowledge on the signal levels of all the legitimate transmitters in the system and must cause negligible interference at all legitimate receivers. The goal of this research is to determine fundamental limits on communication in this setting. In particular, it is shown that communication with a minimum energy per bit arbitrarily close to that of a wide-band interference-free additive white Gaussian noise channel is possible using a pulse-position modulation scheme for the cognitive user in the wide-band limit.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"56 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":"125744388","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
Adaptive Subband Selection in OFDM-Based Cognitive Radios for Better System Coexistence 基于ofdm的认知无线电自适应子带选择，实现更好的系统共存
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562463
Pingzhou Tu, Xiaojing Huang, E. Dutkiewicz
{"title":"Adaptive Subband Selection in OFDM-Based Cognitive Radios for Better System Coexistence","authors":"Pingzhou Tu, Xiaojing Huang, E. Dutkiewicz","doi":"10.1109/CROWNCOM.2008.4562463","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562463","url":null,"abstract":"In an environment of shared radio spectrum, multiple systems may interfere with each other and cause significant impacts on system coexistence. In this paper we propose an adaptive subband selection technique based on orthogonal frequency division multiplexing (OFDM) to avoid interference for better system coexistence when multiple systems are operating in the same unlicensed industrial, scientific and medical (ISM) bands. Under the assumption that the interference power level and the interfered frequency bands are identified at the receiver, interference thresholds, determined over both Gaussian and multipath fading channels, are applied to adaptively select the transmission subbands so that interference is avoided and the system coexistence issues are relaxed. To verify the effectiveness of the proposed adaptive subband selection method, the system bit error rates (BERs) under different interference levels are simulated and compared.","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":"128823429","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
Predicting Radio Resource Availability in Cognitive Radio - an Experimental Examination 在认知无线电中预测无线电资源的可用性-一项实验研究
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562504
S. Kaneko, S. Nomoto, T. Ueda, S. Nomura, Kazunori Takeuchi
{"title":"Predicting Radio Resource Availability in Cognitive Radio - an Experimental Examination","authors":"S. Kaneko, S. Nomoto, T. Ueda, S. Nomura, Kazunori Takeuchi","doi":"10.1109/CROWNCOM.2008.4562504","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562504","url":null,"abstract":"This paper presents a method for predicting radio resource availability in cognitive radio. In this paper, unlike a primary/secondary model, cognitive radio is defined as wireless communication technology in which each node communicates via an optimal wireless system based on recognition of radio resource availability in heterogeneous wireless communication systems. Therefore, it is important to be able to recognize such radio resource availability accurately. However, a cognitive radio node is unable to recognize the subsequent radio resource availability at the time of selecting the optimal wireless system. The authors focus on the prediction of radio resource availability to resolve the above issue. In this paper, the authors focus on IEEE802.11 and radio channel occupation time, which is calculated from packet length and the transmission rate, is used as radio resource availability. From the results of the examination, it would seem feasible that the auto-correlation coefficient (or partial auto-correlation coefficient) could be utilized as information on the reliability of the prediction value when an auto-regression model (AR model) is used for the prediction. Furthermore, by comparing n-step-ahead prediction for a time series calculated for a 1-second interval and 1-step-ahead prediction for a time series calculated for an n-second interval, it is shown that the accuracy of the prediction in both cases is almost identical when the information volume to calculate a prediction expression is the same. Therefore, either prediction approach can be selected depending on the cognitive radio system.","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":"128325896","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
Spectrum Aware Routing for Multi-Hop Cognitive Radio Networks with a Single Transceiver 单收发器多跳认知无线网络的频谱感知路由
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562509
Huisheng Ma, Lili Zheng, Xiao Ma, Yongjian Luo
{"title":"Spectrum Aware Routing for Multi-Hop Cognitive Radio Networks with a Single Transceiver","authors":"Huisheng Ma, Lili Zheng, Xiao Ma, Yongjian Luo","doi":"10.1109/CROWNCOM.2008.4562509","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562509","url":null,"abstract":"In multi-hop single transceiver Cognitive Radio networks (MSCRN), routing becomes of great challenge when IEEE 802.11 DCF is used as the MAC protocol. Routing should not base on common control channel because it is not ensured that common control channel can be obtained by each node. In this paper, we propose a spectrum aware on-demand routing which doesn't base on control channel. A channel assignment algorithm aimed at improving link utilization is derived from delay-analysis. The overhead and gain by switching are balanced in this algorithm. For deafness problem caused by switching can result in significant performance degradation, constraints to avoid the appearance of deafness in channel assignment process are given. We stress that our approach can be easily implemented for the using of standard IEEE 802.11DCF. Results of simulation show that, our approach can well fit MSCRN and improve the network throughput comparing to the same network scenario without cognitive ability.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"22 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":"122968026","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: 174
A Novel Power Control Approach Based on ϵ-Greedy Monte Carlo Method in Cognitive Radio System 一种基于ϵ-Greedy蒙特卡罗方法的认知无线电系统功率控制新方法
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562467
Q. Xiao, Q. Gao, Yunzhou Li, Shidong Zhou, Jing Wang
{"title":"A Novel Power Control Approach Based on ϵ-Greedy Monte Carlo Method in Cognitive Radio System","authors":"Q. Xiao, Q. Gao, Yunzhou Li, Shidong Zhou, Jing Wang","doi":"10.1109/CROWNCOM.2008.4562467","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562467","url":null,"abstract":"In this paper, we consider a model of two-user channel with one primary user and one secondary user. Then we present a novel power control approach based on ε-greedy Monte Carlo method to solve transmit-power control problem of the secondary user. Theoretical analysis and simulation results both show that the approach can not only optimize transmit-power control of the secondary user, but also be used to determine sensing error or interference temperature limit in cognitive-radio environment. And it is also proved that the approach is valid even when the interference temperature limit or sensed interference level is not known or not known accurately.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"151 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":"122965435","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 the Secrecy Capacity of Fading Cognitive Wireless Networks 衰落认知无线网络的保密能力研究
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562470
S. Anand, R. Chandramouli
{"title":"On the Secrecy Capacity of Fading Cognitive Wireless Networks","authors":"S. Anand, R. Chandramouli","doi":"10.1109/CROWNCOM.2008.4562470","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562470","url":null,"abstract":"In this paper, we compute the primary exclusive region (PER) and the secrecy capacity at a primary receiver in a fading cognitive radio network. We consider Rayleigh fading and log-normal shadowing. We also study the effect of secrecy capacity on the PER. We show that log-normal shadowing and Rayleigh fading can degrade the PER by about 40% and the secrecy capacity by about 70%.","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":"114175982","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
A Spread Signals Detection Algorithm based on the Second Order Statistics in Semi-Blind Contexts 半盲环境下基于二阶统计量的扩频信号检测算法
2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562453
P. Jallon
{"title":"A Spread Signals Detection Algorithm based on the Second Order Statistics in Semi-Blind Contexts","authors":"P. Jallon","doi":"10.1109/CROWNCOM.2008.4562453","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562453","url":null,"abstract":"In this contribution, we propose a spread signal detector based on the averaged-power of its autocorrelation function. A cost function that tests this property is build and some results are given on its estimation. We also explain how to use it to detect signals in SISO and SIMO cases. We conclude this paper with some numerical estimation of the proposed algorithm performances.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"32 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":"116718144","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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