2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)最新文献_第4页

Impact of Cognitive Radio on Future Management of Spectrum 认知无线电对未来频谱管理的影响

2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562455

M. Nekovee

引用次数: 27

A CR Platform for Applications in TV Whitespace Spectrum CR平台在电视空白频谱中的应用

2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562543

Kihong Kim, Junki Min, Sungho Hwang, Seongsoo Lee, K. Kim, Haksun Kim

引用次数: 10

Resource Allocation for Cognitive Radios in Dynamic Spectrum Access Environment 动态频谱接入环境下认知无线电的资源分配

2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562545

Dong In Kim, L. Le, E. Hossain

{"title":"Resource Allocation for Cognitive Radios in Dynamic Spectrum Access Environment","authors":"Dong In Kim, L. Le, E. Hossain","doi":"10.1109/CROWNCOM.2008.4562545","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562545","url":null,"abstract":"We investigate the dynamic spectrum sharing problem among primary and secondary users in a cognitive radio network subject to QoS constraints for secondary users and interference constraints for primary users. For a scenario where only mean channel gains from secondary users to primary receiving points, which are averaged over short-term fading, are available, we derive outage probabilities for secondary users and interference constraint violation probabilities for primary users. Based on the analysis, we develop a framework to perform joint admission control and rate/power allocation for secondary users such that statistical guarantees on the violation probabilities of both the QoS and the interference constraints are achieved. Spectrum access by the secondary users can exploit the time-varying nature of the activity of the primary users, and thereby much higher throughput can be achieved compared to the case where primary users are assumed to be active at all time. Also, via extensive numerical analysis, throughput performances of primary and secondary users are investigated considering different levels of implementation complexity due to channel estimation.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"54 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":"123125610","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

Radio Environment Prediction for Cognitive Radio 认知无线电的无线电环境预测

2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562502

Kazunori Takeuchi, S. Kaneko, S. Nomoto

{"title":"Radio Environment Prediction for Cognitive Radio","authors":"Kazunori Takeuchi, S. Kaneko, S. Nomoto","doi":"10.1109/CROWNCOM.2008.4562502","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562502","url":null,"abstract":"The evaluation and the prediction of the radio environment is one of the key issues to improve the cognitive radio. The prediction accuracy of the transmission capability in each wireless media will directly affect the performance of the transmission performance. In this paper, a novel approach to predict the radio environment using AR model is shown in detail. In the cognitive radio system using the multi-transmission links, each wireless node selects an optimal wireless module, based on recognition of the radio environment in heterogeneous wireless communication systems. In this scheme, the reliable method to compare the heterogeneous wireless media capacity with normalized scale is necessary. The authors introduce the new index of the wireless resources as \"availability of wireless transmission capability\" than the existing and the well known the radio intensity like Signal/Noise ratio, BER or re-transmission ratio. This index enables us to compare the wireless resources between the heterogeneous wireless media. Moreover, it can applicable to the unlicensed band like Wi-Fi where many wireless nodes act themselves in the same area. The verification of the possibility and applicability of the radio environment prediction are shown using field data in various points. Based on the results of the verification, the possibility and the accuracy to predict the wireless media capacity according to the radio environment parameter are shown. The result is independent of locations of the field. Furthermore, the advantage of the prediction in comparison with the approach without prediction is shown from the viewpoint of statistics.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"91 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":"115023810","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

Scheduling Model for Cognitive Radio 认知无线电调度模型

2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562478

P. Zhu, Jinglong Li, Xufa Wang

引用次数: 35

Downlink Performance Analysis of Cognitive Radio based Cellular Relay Networks 基于认知无线电的蜂窝中继网络下行性能分析

2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562491

Seungmo Kim, Wan Choi, Yonghoon Choi, Jong-Min Lee, Youngnam Han, Insun Lee

引用次数: 26

Architecture for Next-Generation Reconfigurable Wireless Networks using Cognitive Radio 基于认知无线电的下一代可重构无线网络体系结构

2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562537

Fangmin Xu, Luyong Zhang, Zheng Zhou, Y. Ye

引用次数: 3

Optimal Transmission Strategy for Cognitive Radio Networks with Partial Channel State Information 具有部分信道状态信息的认知无线网络的最优传输策略

2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562464

Lan Zhang, Ying-Chang Liang, Yan Xin

{"title":"Optimal Transmission Strategy for Cognitive Radio Networks with Partial Channel State Information","authors":"Lan Zhang, Ying-Chang Liang, Yan Xin","doi":"10.1109/CROWNCOM.2008.4562464","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562464","url":null,"abstract":"In this paper, we consider a spectrum sharing based cognitive radio (CR) network where the secondary user (SU) coexists with the primary user (PU) as long as the interference power received by the PU is less than a acceptable threshold. Suppose that the SU's transmitter and receiver are equipped with multiple antennas and the PU's receiver are equipped with single receive antenna. We assume that the SU's channel state information (CSI) is known at the SU transmitter perfectly, however, due to less cooperation between the SU and the PU, only partial CSI between SU and PU is available at the SU transmitter. We seek to determine the optimal transmit signal covariance to maximize the transmission rate of the SU where the covariance is subject to the average interference power constraint of the PU as well as the transmit power constraint of the SU transmitter. Two iterative algorithms are proposed to solve these problems, and it is shown that the algorithms can converge to the optimal solution. Simulation results are provided to show the effectiveness of the algorithms.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"12 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":"133771378","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

Subband Adaptive Filtering for Efficient Spectrum Utilization in Cognitive Radios 认知无线电中有效利用频谱的子带自适应滤波

2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562499

Pingzhou Tu, Xiaojing Huang, E. Dutkiewicz

{"title":"Subband Adaptive Filtering for Efficient Spectrum Utilization in Cognitive Radios","authors":"Pingzhou Tu, Xiaojing Huang, E. Dutkiewicz","doi":"10.1109/CROWNCOM.2008.4562499","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562499","url":null,"abstract":"Efficient spectrum utilization can be achieved in several ways, one of which is a better spectrum access. In this paper we propose a subband adaptive filtering method for effective spectrum access and dynamic spectrum sharing in cognitive radios (CR). Based on an interleaved spread spectrum orthogonal frequency division multiplexing (ISS-OFDM) multiple subband transmission signal and subband adaptive filtering technique, some interfered subbands of the transmission signal are filtered and dropped off. The other subbands without interference or with interference less than a predetermined threshold are used for information transmission. The flexibility of the adaptively selecting transmission subbands provides users with the ability to fill in spectrum holes with appropriate number of subbands. Consequently, the spectrum utilization efficiency is improved. We simulate the system bit error rate (BER) performances and demonstrate the improvement on spectrum utilization efficiency by using this subband adaptive filtering method, when different numbers of subbands are used for information transmission.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"11 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":"132998483","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

Dynamic Spectrum Allocation with Second-Price Auctions: When Time is Money 动态频谱分配与第二价格拍卖:当时间就是金钱

2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008) Pub Date : 2008-05-15 DOI: 10.1109/CROWNCOM.2008.4562546

A. Hoang, Ying-Chang Liang

{"title":"Dynamic Spectrum Allocation with Second-Price Auctions: When Time is Money","authors":"A. Hoang, Ying-Chang Liang","doi":"10.1109/CROWNCOM.2008.4562546","DOIUrl":"https://doi.org/10.1109/CROWNCOM.2008.4562546","url":null,"abstract":"We consider a dynamic spectrum access scenario in which transmission opportunities are allocated to users based on a second price, sealed bid auction. Each user experiences a time-varying channel and submits a bid for transmission right in each time slot. A base station collects bids from all users and allocates the channel to a user with the highest bid, who then pays the price equal the second highest bid. The distinctive feature of our model is that it treats time as money and allows each user to bid and to pay for the transmission rights using his/her own communication time. For each time slot, the value of a bid submitted by each user is equal the amount of time he/she promises to forfeit to the base station for the right to transmit during the remaining of the time slot. That means the base station collects part of each time slot from the winning user for its own usage and allocates the rest to the winning user. Users can vary their bids based on their channel conditions, subject to constraints on average budgets. From the users' point of view, we show that there exists Nash equilibrium bidding strategies in the two-user case. From the base station's point of view, we investigate how average budget constraints should be set to balance between base station's revenue and users' satisfaction.","PeriodicalId":409408,"journal":{"name":"2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)","volume":"35 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":"121877206","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