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2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications最新文献

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An efficient uplink multiuser MIMO protocol in IEEE 802.11 WLANs IEEE 802.11无线局域网中一种高效的上行多用户MIMO协议
2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2009-09-01 DOI: 10.1109/PIMRC.2009.5450289
T. Tandai, Hiroki Mori, K. Toshimitsu, Takahiro Kobayashi
{"title":"An efficient uplink multiuser MIMO protocol in IEEE 802.11 WLANs","authors":"T. Tandai, Hiroki Mori, K. Toshimitsu, Takahiro Kobayashi","doi":"10.1109/PIMRC.2009.5450289","DOIUrl":"https://doi.org/10.1109/PIMRC.2009.5450289","url":null,"abstract":"This paper proposes an uplink Multi-User (MU) Multiple-Input Multiple-Output (MIMO) protocol in IEEE 802.11 WLANs. In order to realize the uplink MU-MIMO transmission in 802.11 WLANs, there are several problems to be solved. Synchronized transmission among the stations (STAs) is one of the problems and the spatial compatibility between the transmitting STAs is another problem. Therefore, it is considered that many overheads are needed to realize the uplink MU-MIMO transmission. In the proposed protocol, after an access point (AP) informs the start of the uplink access phase by transmitting the indication frame, the STAs having data to be sent to the AP transmit the uplink access requests in the OFDMA manner. The AP recognizes the uplink access requests by detecting the subcarrier signals and it requests the detected STAs to transmit the pilot signals in the TDMA manner. The AP calculates the channel state information (CSI) between each STA from the received pilot signal and selects the STAs to be permitted to transmit the uplink frames based on the CSIs. The AP notifies the information about the permitted STAs and about the capable transmission rate, and then the permitted STAs simultaneously transmit the frames at the notified transmission rate. In the protocol, an efficient OFDMA-based uplink access request transmission scheme is also proposed. Thus, by adopting the proposed protocol, the overheads can be reduced and the network throughput can be enhanced. Computer simulations are performed and the results show the effectiveness of the proposed method.","PeriodicalId":110448,"journal":{"name":"2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"122 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116291451","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: 21
Space-frequency transmission and channel estimation for 2×2 cooperative systems 2×2合作系统的空频传输与信道估计
2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2009-09-01 DOI: 10.1109/PIMRC.2009.5450382
Qi Jiang, Jiming Chen, G. Shen, Shan Jin
{"title":"Space-frequency transmission and channel estimation for 2×2 cooperative systems","authors":"Qi Jiang, Jiming Chen, G. Shen, Shan Jin","doi":"10.1109/PIMRC.2009.5450382","DOIUrl":"https://doi.org/10.1109/PIMRC.2009.5450382","url":null,"abstract":"In this paper, we propose a distributed space-frequency transmit scheme in double selective channels for the OFDM cooperative system with two source and two destination nodes. In stead of interfering with each other, the two links cooperate by letting a source be a relay of the other one. Under this structure, the two sources can fulfill cooperative transmission together. We also design the frame structure to estimate the double selective channels. With the proper transmit and receive processing, the performance of this scheme can approach that of the 2×1 space-frequency block code.","PeriodicalId":110448,"journal":{"name":"2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116355400","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
Low consumption home femto base stations 低消耗家庭基站
2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2009-09-01 DOI: 10.1109/PIMRC.2009.5449939
I. Haratcherev, Carine Balageas, M. Fiorito
{"title":"Low consumption home femto base stations","authors":"I. Haratcherev, Carine Balageas, M. Fiorito","doi":"10.1109/PIMRC.2009.5449939","DOIUrl":"https://doi.org/10.1109/PIMRC.2009.5449939","url":null,"abstract":"The expected massive adoption of home femto base stations will increase the overall power consumption, requiring eco-designed sleep modes. Whenever there are no user under the coverage of a home femto base station (at night for example), keeping it on can be seen as a waste of power, excessive interferences and lack of security. This paper proposes a method to switch-off the femto base station radio emission and wake it up when necessary. Our approach uses a second low-power channel that carries out-of-band control information to maintain connectivity. The paper will provide the software and hardware architecture and performance results of a Wi-Fi demonstrator.","PeriodicalId":110448,"journal":{"name":"2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121507358","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: 19
Bottleneck-first scheduling for wireless mesh backhaul networks 无线网状回程网络的瓶颈优先调度
2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2009-09-01 DOI: 10.1109/PIMRC.2009.5450290
Chaojun Xu, Jimin Liu, F. Han, Wu Zheng, Shan Jin
{"title":"Bottleneck-first scheduling for wireless mesh backhaul networks","authors":"Chaojun Xu, Jimin Liu, F. Han, Wu Zheng, Shan Jin","doi":"10.1109/PIMRC.2009.5450290","DOIUrl":"https://doi.org/10.1109/PIMRC.2009.5450290","url":null,"abstract":"In this paper, resource allocation for Orthogonal Frequency Division Multiple Access (OFDMA)-based Wireless Mesh Networks (WMNs) is investigated. First, the Even-Odd framework is modified to be better suited for different traffic patterns. Second, the scheduling problem in the modified Even-Odd framework is formulated as a Mixed Integer Quadratically Constrainted Programming (MIQCP), and a heuristic solution is derived. The proposed heuristic solution is motivated from the fact that the bottleneck collision domain throttles the capacity of the networks, and the links in the bottleneck collision domain should be allocated resource carefully to maximize the throughput. The numerical results show that the proposed scheduling scheme can achieve throughput which is over 90% of the nominal capacity and the modified Even-Odd framework improve the end-to-end throughput for asymmetric traffic.","PeriodicalId":110448,"journal":{"name":"2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114836353","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
Price of ignorance in dynamic topology control 动态拓扑控制中无知的代价
2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2009-09-01 DOI: 10.1109/PIMRC.2009.5450072
R. S. Komali, P. Mähönen
{"title":"Price of ignorance in dynamic topology control","authors":"R. S. Komali, P. Mähönen","doi":"10.1109/PIMRC.2009.5450072","DOIUrl":"https://doi.org/10.1109/PIMRC.2009.5450072","url":null,"abstract":"In autonomous ad hoc networks, nodes may act in their self-interest to improve their performance, perhaps at the expense of other nodes', or even the overall network's, performance. Besides, nodes are often mobile and must contend with limited and obsolete information about the operating state of network during their decision-making. We examine topology control of ad hoc networks and analyze the impact of mobility, selfishness, and partial information on energy efficiency and network connectivity using tools from game theory. We develop a local topology control algorithm that uses the idea of maintaining connectivity of 1-hop neighborhoods. By examining the trade-off between network performance (energy efficiency) and the cost of cooperation (by exchanging control messages) it turns out that mobility and selfishness are, in some sense, synergistic features in information-constrained networks. Such networks consume least energy when nodes are more mobile and have significantly less connectivity information.","PeriodicalId":110448,"journal":{"name":"2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114842474","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
Channel occupancy estimation method for Wireless LAN 无线局域网信道占用估计方法
2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2009-09-01 DOI: 10.1109/PIMRC.2009.5449813
T. Fukuhara, A. Yamaguchi, K. Kashiki, Toshinori Suzuki, Kazunori Takeuchi
{"title":"Channel occupancy estimation method for Wireless LAN","authors":"T. Fukuhara, A. Yamaguchi, K. Kashiki, Toshinori Suzuki, Kazunori Takeuchi","doi":"10.1109/PIMRC.2009.5449813","DOIUrl":"https://doi.org/10.1109/PIMRC.2009.5449813","url":null,"abstract":"Channel occupancy is key information to realize efficient operation of the wireless system. Channel occupancy can be defined as the time occupancy ratio in the case of Wireless LAN (WLAN). We propose a novel passive method to estimate the time occupancy ratio of WLAN. The proposed method produces greater improvement in estimation accuracy compared with that of conventional methods. In this paper, we introduce the definition of the time occupancy ratio as the utilization index of a WLAN radio resource. Then, details of the proposal are introduced. Finally, the excellent evaluation results executed on an experimental system are introduced even when many loss packets exist.","PeriodicalId":110448,"journal":{"name":"2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127690856","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
Polarimetric beamforming comparison of the multipath clusterization of ML estimates and the measurement data of a MIMO macrocell channel 多径聚类估计与MIMO宏小区信道测量数据的极化波束形成比较
2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2009-09-01 DOI: 10.1109/PIMRC.2009.5450157
Lawrence Materum, J. Takada, I. Ida, Y. Oishi
{"title":"Polarimetric beamforming comparison of the multipath clusterization of ML estimates and the measurement data of a MIMO macrocell channel","authors":"Lawrence Materum, J. Takada, I. Ida, Y. Oishi","doi":"10.1109/PIMRC.2009.5450157","DOIUrl":"https://doi.org/10.1109/PIMRC.2009.5450157","url":null,"abstract":"Clusters produced by multipath clusterization were comparatively evaluated using the directional power spectrum of the measured channel, which was obtained by polarimetric beamforming due to the dual-polarized nature of the channel sounding data. The clusters were from the results of the clusterization of maximum-likelihood-based path parameter estimates of a macrocell channel. The approach provides a way to render the physical meaning of clustering results in line with the measured channel. The result shows some slight offset from the measured channel, nevertheless, the cluster locations were comparable.","PeriodicalId":110448,"journal":{"name":"2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127876703","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
A codebook with low complexity for limited feedback precoding 一种用于有限反馈预编码的低复杂度码本
2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2009-09-01 DOI: 10.1109/PIMRC.2009.5450321
Fengming Cao, M. Sandell, F. Tosato
{"title":"A codebook with low complexity for limited feedback precoding","authors":"Fengming Cao, M. Sandell, F. Tosato","doi":"10.1109/PIMRC.2009.5450321","DOIUrl":"https://doi.org/10.1109/PIMRC.2009.5450321","url":null,"abstract":"Codebook-based limited feedback precoded MIMO systems involve vector quantization, which may require intensive computations, especially for large codebooks. In this paper we show how the complexity and codebook storage can be significantly reduced by using a special alphabet to generate the codebook. Simulation results show that the performance with the generated codebook is comparable with other codebooks which have higher complexity.","PeriodicalId":110448,"journal":{"name":"2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126332325","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
A Smart Management Framework for Multihomed Mobile Nodes & Mobile Routers 一种多归属移动节点和移动路由器的智能管理框架
2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2009-09-01 DOI: 10.1109/PIMRC.2009.5450026
R. B. Rayana, J. Bonnin
{"title":"A Smart Management Framework for Multihomed Mobile Nodes & Mobile Routers","authors":"R. B. Rayana, J. Bonnin","doi":"10.1109/PIMRC.2009.5450026","DOIUrl":"https://doi.org/10.1109/PIMRC.2009.5450026","url":null,"abstract":"The ceaseless evolution of wireless communications is taking the shape of the so called 4G networks: Fundamentally different radio technologies coexist and cooperate to offer continuous connectivity to applications. Mobile devices are now equipped to take advantage of access media abundance to improve the user experience. However, traditional management techniques were quickly obsoleted by the spatial and temporal context variations, especially during mobility. Therefore, novel management frameworks need to be designed to accompany this evolution. The following paper describes SmartMob6 (Smart Management Framework for Multihomed Mobile Nodes & Mobile Routers): a context-aware policy-based management solution combined with a combinatorial optimization algorithm to maximize the satisfaction of the applications while respecting the stakeholders policy rules. Case studies highlight the benefits of such a system over more conventional management techniques.","PeriodicalId":110448,"journal":{"name":"2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126210648","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: 6
Enhanced linearized location estimators with optimization-based combinations of radiolocation measurements 基于优化的无线电定位测量组合的增强线性化位置估计器
2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2009-09-01 DOI: 10.1109/PIMRC.2009.5450351
J. Youssef, B. Denis, C. Godin, S. Lesecq
{"title":"Enhanced linearized location estimators with optimization-based combinations of radiolocation measurements","authors":"J. Youssef, B. Denis, C. Godin, S. Lesecq","doi":"10.1109/PIMRC.2009.5450351","DOIUrl":"https://doi.org/10.1109/PIMRC.2009.5450351","url":null,"abstract":"Popular linearized estimators such as the Extended Kalman Filter (EKF) or the one-step linearized Least Squares (LS) estimator, which have been used for years to solve positioning and tracking problems in location-enabled wireless networks, require that available observations are locally linearized (as functions of estimated variables) around the predicted state or initial optimization guess. In most of practical cases however, using measured radiolocation metrics as direct observations (e.g. Time of Arrival (TOA) or Time Differential of Arrival (TDOA)) might lead to poor linearization conditions and hence alter estimation precision and robustness accordingly. In this paper, we present an optimization-based method that enables to adaptively build quasi-linear observations as combinations of raw measurements. The main idea is to choose the coefficients of the linear combinations that minimize the Mean Square Error (MSE) of location estimators, while taking into account both bias errors due to linearization and measurement noise effects.","PeriodicalId":110448,"journal":{"name":"2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127998317","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
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