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IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference最新文献

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Two Energy-Saving Schemes for Cooperative Transmission with Opportunistic Large Arrays 机会大阵列协同传输的两种节能方案
IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference Pub Date : 2007-12-26 DOI: 10.1109/GLOCOM.2007.200
L. Thanayankizil, A. Kailas, M. A. Ingram
{"title":"Two Energy-Saving Schemes for Cooperative Transmission with Opportunistic Large Arrays","authors":"L. Thanayankizil, A. Kailas, M. A. Ingram","doi":"10.1109/GLOCOM.2007.200","DOIUrl":"https://doi.org/10.1109/GLOCOM.2007.200","url":null,"abstract":"An opportunistic large array (OLA) is a form of cooperative diversity in which a large group of simple, inexpensive relays or forwarding nodes operate without any mutual coordination, but naturally fire together in response to energy received from a single source or another OLA When used for broadcast, OLAs form concentric rings around the source, and have been shown to use less energy than conventional multi- hop protocols. This paper proposes two schemes, one for general OLA transmission and one specifically for upstream routing in the topology of wireless sensor networks, that each save over 50% of the energy of flooding. The OLA-T scheme uses a transmission threshold to suppress nodes that would make weak contributions. The OLA Concentric Routing Algorithm (OLACRA) takes advantage of the concentric ring structure of broadcast OLAs to limit flooding on the upstream connection. Combination of these two schemes and variations of OLACRA are evaluated in terms of energy savings and probability of successful upstream routing.","PeriodicalId":370937,"journal":{"name":"IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131067286","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: 14
Multi-State Virtual Network Architecture for Next Generation Satellite Networks 面向下一代卫星网络的多状态虚拟网络架构
IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference Pub Date : 2007-12-26 DOI: 10.1109/GLOCOM.2007.954
Ömer Korçak, Fatih Alagöz
{"title":"Multi-State Virtual Network Architecture for Next Generation Satellite Networks","authors":"Ömer Korçak, Fatih Alagöz","doi":"10.1109/GLOCOM.2007.954","DOIUrl":"https://doi.org/10.1109/GLOCOM.2007.954","url":null,"abstract":"Virtual node (VN) approach is widely used in satellite networks research but it has some deficiencies. In this work, we enhanced VN technique and propose a generic virtual topology model, namely multi-state virtual network (MSVN) architecture. We investigate a new mathematical model for MSVN and present its potential contribution to the overall system availability.","PeriodicalId":370937,"journal":{"name":"IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131076694","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
A QoS Aware Eigenmode Based Power Allocation Scheme for MIMO-OFDM Multi-User Systems 基于QoS感知特征模的MIMO-OFDM多用户系统功率分配方案
IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference Pub Date : 2007-12-26 DOI: 10.1109/GLOCOM.2007.599
Yubo Yang, Lin Tian, Gengfa Fang, Jinglin Shi, Zhongcheng Li
{"title":"A QoS Aware Eigenmode Based Power Allocation Scheme for MIMO-OFDM Multi-User Systems","authors":"Yubo Yang, Lin Tian, Gengfa Fang, Jinglin Shi, Zhongcheng Li","doi":"10.1109/GLOCOM.2007.599","DOIUrl":"https://doi.org/10.1109/GLOCOM.2007.599","url":null,"abstract":"In this paper, a practical eigenmode based scheduling algorithm with double loops (ESDL) is proposed for multi-user MIMO/OFDM systems. The wireless channels are decomposed into several eigenmodes, and the eigenmode based power allocation is formulated into an optimization problem, whose object is to maximize the system capacity while guaranteeing users' QoS requirements. By replacing the QoS constraints with penalty functions, the problem is reformulated to a penalty problem with a given penalty factor, which is solved by a greedy power allocation (GPA) scheme as the inner loop. The penalty factor is then updated in the outer loop according to QoS constraints. Numerical results show that compared with other algorithms proposed in the literature, ESDL can result in significant improvement in channel efficiency, while at the same time guaranteeing minimum data rates of users.","PeriodicalId":370937,"journal":{"name":"IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133004478","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
Efficient Scheduling for Heterogeneous Services in OFDMA Downlink OFDMA下行异构业务的高效调度
IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference Pub Date : 2007-12-26 DOI: 10.1109/GLOCOM.2007.613
R. Agarwal, V. Majjigi, R. Vannithamby, J. Cioffi
{"title":"Efficient Scheduling for Heterogeneous Services in OFDMA Downlink","authors":"R. Agarwal, V. Majjigi, R. Vannithamby, J. Cioffi","doi":"10.1109/GLOCOM.2007.613","DOIUrl":"https://doi.org/10.1109/GLOCOM.2007.613","url":null,"abstract":"We consider optimal allocation of resources to users in a downlink OFDMA system to support heterogeneous applications consisting of both deadline-sensitive (DS) and best-effort (BE) data in a cross-layer manner. Given the user queue-states and long-term channel statistics, the proposed persistent scheduling algorithm allocates the minimum resources to 'just' meet the deadlines for DS packets (QoS guarantee). The remaining resources are optimally split between the users for their BE data to maximize sum-rate, minimize buffer holding cost or any general utility function. We formulate the resource allocation problem as a single geometric program (GP) that can be solved using standard convex optimization software tools. Simulation results are presented to compare the performance of different objectives for the BE applications in presence of DS traffic.","PeriodicalId":370937,"journal":{"name":"IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference","volume":"370 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133018893","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: 25
The Impacts of Radio Channels and Node Mobility on Link Statistics in Mobile Ad Hoc Networks 无线信道和节点移动性对移动自组网链路统计的影响
IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference Pub Date : 2007-12-26 DOI: 10.1109/GLOCOM.2007.232
Ming Zhao, Wenye Wang
{"title":"The Impacts of Radio Channels and Node Mobility on Link Statistics in Mobile Ad Hoc Networks","authors":"Ming Zhao, Wenye Wang","doi":"10.1109/GLOCOM.2007.232","DOIUrl":"https://doi.org/10.1109/GLOCOM.2007.232","url":null,"abstract":"Understanding link statistics in mobile ad hoc networks (MANETs) is essential to design adaptive routing protocols and achieve desired network performance. While much attention has been given to the node mobility impacts, little has been done to investigate the influence of dynamic channel fadings and the joint effects of the interactions among radio channels, transmission range, node mobility and node-pair distance on link statistics. In this paper, we investigate the link stability and availability by using a distance transition probability matrix of a relative distance between two nodes. Our analysis takes the node effective transmission range Re into account. The relative node movement is based on the Semi-Markov Smooth (SMS) mobility model [1] which captures the smooth node speed (V) transition and the radio channel variations in a small time- scale. We show that the PDF of link lifetime in MANETs can be effectively approximated by the exponential distribution characterized by the parameter V/Re. Moreover, we And that the impacting factors on residual link lifetime are in the decreasing order of node speed, transmission range, node-pair distance. The analytical results are validated by extensive simulations.","PeriodicalId":370937,"journal":{"name":"IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132649450","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
Cholesky Based Efficient Algorithms for the MMSE-SIC Receiver 基于Cholesky的MMSE-SIC接收机高效算法
IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference Pub Date : 2007-12-26 DOI: 10.1109/GLOCOM.2007.577
Junyoung Nam, S. R. Kim, H. Chung, Jinho Choi, J. Ha
{"title":"Cholesky Based Efficient Algorithms for the MMSE-SIC Receiver","authors":"Junyoung Nam, S. R. Kim, H. Chung, Jinho Choi, J. Ha","doi":"10.1109/GLOCOM.2007.577","DOIUrl":"https://doi.org/10.1109/GLOCOM.2007.577","url":null,"abstract":"The minimum mean square error with successive interference cancellation (MMSE-SIC) receiver is known to achieve the capacity of multiple-input multiple-output (MIMO) fast fading channels in the presence of knowledge of the channel at the receiver. This paper presents efficient and numerically stable Cholesky decomposition based detection algorithms for MMSE-SIC, exploiting a property of ordering of MMSE-SIC. The proposed algorithms are shown to significantly reduce the computational complexity of existing efficient algorithms for SIC in MIMO flat fading channels.","PeriodicalId":370937,"journal":{"name":"IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133108203","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
Optimal Batch Scheduling in DVB-S2 Satellite Networks DVB-S2卫星网络的最优批调度
IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference Pub Date : 2007-12-26 DOI: 10.1109/GLOCOM.2007.875
G. Peeters, B. V. Houdt, C. Blondia
{"title":"Optimal Batch Scheduling in DVB-S2 Satellite Networks","authors":"G. Peeters, B. V. Houdt, C. Blondia","doi":"10.1109/GLOCOM.2007.875","DOIUrl":"https://doi.org/10.1109/GLOCOM.2007.875","url":null,"abstract":"In this paper we present a new theoretical model to assess the performance of a class of batch scheduling orders in a forward DVB-S2 satellite link. The scheduling order in a DVB-S2 link will determine the order in which IP packets are transmitted to the receivers and thus determines the amount of required padding and sub-optimal transmissions. The validity of the model is investigated by various simulation runs which show a very close agreement with the theoretical model. Using this model we also identify the optimal scheduling order within this class of orders, given that some mild and realistic conditions on the modulation and coding schemes apply.","PeriodicalId":370937,"journal":{"name":"IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133112936","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
Adaptive Multi-Dimensional QoS-Based Packet Scheduling Scheme for Multimedia Broadcasting Over Geostationary Satellite Networks 基于自适应多维qos的地球同步卫星网络多媒体广播分组调度方案
IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference Pub Date : 2007-12-26 DOI: 10.1109/GLOCOM.2007.876
Hongfei Du, L. Fan, B. Evans
{"title":"Adaptive Multi-Dimensional QoS-Based Packet Scheduling Scheme for Multimedia Broadcasting Over Geostationary Satellite Networks","authors":"Hongfei Du, L. Fan, B. Evans","doi":"10.1109/GLOCOM.2007.876","DOIUrl":"https://doi.org/10.1109/GLOCOM.2007.876","url":null,"abstract":"Future success towards 3G and beyond systems is in supporting a variety of multimedia services with diverse quality-of-service (QoS) demands. With their inherent broadcast capabilities, the broadband satellite networks are regarded as a promising platform for delivering multimedia services. For these systems, it is highly desired that the available resources can be utilized in an optimized way. Packet scheduling schemes play a key role in providing various QoS support for provisioning multimedia services. By taking into account essential aspects of QoS provisioning whilst preserving the system power/resource constraints, the proposed Adaptive Multi-dimensional QoS-based (AMQ) packet scheduling scheme aims to effectively satisfy diverse QoS requirements and adaptively optimize the resource utilization for satellite multimedia broadcasting. Simulation results show that the AMQ achieves much better performance than those of existing schemes by satisfying multiple QoS aspects, such as delay, throughput, channel utilization and fairness.","PeriodicalId":370937,"journal":{"name":"IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131457889","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
Joint Reduction of Peak-to-Average Power Ratio and Out-of-Band Power in OFDM Systems OFDM系统中峰均功率比和带外功率的联合降低
IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference Pub Date : 2007-12-26 DOI: 10.1109/GLOCOM.2007.724
M. Senst, M. Jordan, Meik Dörpinghaus, Michael Farber, G. Ascheid, H. Meyr
{"title":"Joint Reduction of Peak-to-Average Power Ratio and Out-of-Band Power in OFDM Systems","authors":"M. Senst, M. Jordan, Meik Dörpinghaus, Michael Farber, G. Ascheid, H. Meyr","doi":"10.1109/GLOCOM.2007.724","DOIUrl":"https://doi.org/10.1109/GLOCOM.2007.724","url":null,"abstract":"The high peak-to-average power ratio is a major drawback of OFDM systems. Many PAPR reduction techniques have been proposed in the literature, among them a method that uses a subset of tones that do not carry any data, but are modulated such that the PAPR of the resulting time domain signal is minimized. Another problem of OFDM systems is the high out-of-band power caused by the sidelobes of the modulated tones. The OBP can be reduced by modulating reserved tones at the edges of the occupied spectrum so that the sidelobes of the data carriers are reduced. In this paper, we propose to consider both optimization problems jointly. This way, the amount of PAPR and OBP reduction can be significantly enhanced in comparison to a system that performs two separate optimization steps. Furthermore, the joint reduction algorithm offers more flexibility, because the relative weighting of the two optimization criteria can easily be changed, resulting in a smooth trade-off curve.","PeriodicalId":370937,"journal":{"name":"IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126583224","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
A CAPWAP-Compliant Solution for Radio Resource Management in Large-Scale 802.11 WLAN 基于capwap的大规模802.11 WLAN无线资源管理解决方案
IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference Pub Date : 2007-12-26 DOI: 10.1109/GLOCOM.2007.692
A. Levanti, Filippo Giordano, I. Tinnirello
{"title":"A CAPWAP-Compliant Solution for Radio Resource Management in Large-Scale 802.11 WLAN","authors":"A. Levanti, Filippo Giordano, I. Tinnirello","doi":"10.1109/GLOCOM.2007.692","DOIUrl":"https://doi.org/10.1109/GLOCOM.2007.692","url":null,"abstract":"Recently, the impressive success of the IEEE 802.11 WLAN technology has dramatically changed the role of the wireless connectivity provisioning. Born as a wireless extension of small office or home networks, todays the WLANs are getting more and more popular as a large, even metropolitan, area networks. The deployment of large-scale WLANs has some critical issues, because of the lack of coordinated management functionalities among the network nodes. In this paper we briefly describe the CAPWAP architectural solution, for centralizing some control and maintenance functionalities in large scale WLAN, by guaranteeing the interoperability between network nodes provided by different vendors. We also investigate on a simple and efficient application for optimizing the wireless network resources, which is possible thanks to the centralization of some control operations. In particular, we propose an automatic frequency planning algorithm, not requiring any network administrator aids, which we tested via simulation and we implemented in an actual testbed.","PeriodicalId":370937,"journal":{"name":"IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128825248","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
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