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IEEE Global Telecommunications Conference, 2004. GLOBECOM '04.最新文献

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Joint estimation of Doppler frequency and directions in channel sounding using switched Tx and Rx arrays 用切换Tx和Rx阵列联合估计信道探测的多普勒频率和方向
IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1378429
T. Pedersen, C. Pedersen, X. Yin, B. Fleury, R. Pedersen, B. Bozinovska, A. Hviid, P. Jourdan, A. Stucki
{"title":"Joint estimation of Doppler frequency and directions in channel sounding using switched Tx and Rx arrays","authors":"T. Pedersen, C. Pedersen, X. Yin, B. Fleury, R. Pedersen, B. Bozinovska, A. Hviid, P. Jourdan, A. Stucki","doi":"10.1109/GLOCOM.2004.1378429","DOIUrl":"https://doi.org/10.1109/GLOCOM.2004.1378429","url":null,"abstract":"To save hardware and reduce the effort to calibrate the system, channel sounding with Tx and Rx antenna arrays is commonly performed in TDM mode where the array elements are successively switched. We refer to this technique as TDM-MIMO channel sounding. The ISI-SAGE algorithm (Fleury, B.H. et al., 2003; Yin, X. et al., 2003), applied in combination with TDM-MIMO channel sounding, makes it possible to extend the Doppler frequency estimation range (DFER) (Yin, X. et al., 2003). The extension is significant when arrays with large element numbers are employed. We derive the signal model for TDM-MIMO channel sounding and report analytical investigations showing that this DFER extension requires selection of switching modes (SMs) tailored to the array characteristics. The SM of a switched array is the temporal order in which the array elements are switched. In fact, the traditionally used SMs of uniform linear and planar arrays, where the elements are switched according to their natural spatial ordering, prove to be inappropriate as they lead to an ambiguity in the joint estimation of DF and directions. We also introduce the concept of normalized sidelobe level (NSL) associated to the SM of a switched array. We show that minimizing the NSL is a sensible criterion for the identification of SM, leading to DF and direction estimates with nearly optimum performance in terms of root mean square estimation error. Finally experimental investigations illustrate the impact of the SM of a uniform planar array on the behaviour of the DF and direction of arrival estimates computed with the ISI-SAGE algorithm.","PeriodicalId":162046,"journal":{"name":"IEEE Global Telecommunications Conference, 2004. GLOBECOM '04.","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115355037","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: 18
Towards interoperability test generation of time dependent protocols: a case study 对时间相关协议的互操作性测试生成:一个案例研究
IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1378031
Zhiliang Wang, Jianping Wu, Xia Yin
{"title":"Towards interoperability test generation of time dependent protocols: a case study","authors":"Zhiliang Wang, Jianping Wu, Xia Yin","doi":"10.1109/GLOCOM.2004.1378031","DOIUrl":"https://doi.org/10.1109/GLOCOM.2004.1378031","url":null,"abstract":"Protocol interoperability testing is an important technique to ensure the quality of implementations of network communication protocols. In this paper, we present an efficient method to generate interoperability testing for time dependent protocols. We use the formal model, communicating TIOAs (timed input automata) (CTIOAs), to specify the system under test, in which time constraints are specified by linear expressions involving local clock values. In the method, firstly a global state reachability tree of CTIOAs should be generated, in which test sequences can be selected. Then we analyze the executability of the generated test sequences. By converting linear constraints of local clocks to a global clock, the problem reduces to a linear programming problem. We also select a set of appropriate initial clock values to make test sequences executable. An example of a neighbor discovery protocol is used to illustrate our method.","PeriodicalId":162046,"journal":{"name":"IEEE Global Telecommunications Conference, 2004. GLOBECOM '04.","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115474039","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
Multi-tone signaling for high-speed backplane electrical links 用于高速背板电气链路的多音信令
IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1378130
A. Amirkhany, V. Stojanović, M. Horowitz
{"title":"Multi-tone signaling for high-speed backplane electrical links","authors":"A. Amirkhany, V. Stojanović, M. Horowitz","doi":"10.1109/GLOCOM.2004.1378130","DOIUrl":"https://doi.org/10.1109/GLOCOM.2004.1378130","url":null,"abstract":"A multi-tone architecture is proposed for high-speed backplane serial links. To limit complexity, the links use analog multi-tone rather than the more modern DMT. The tradeoffs involved in the design of such a system are examined and the performance of a serial link based on this approach is compared to a baseband architecture in terms of data rate and complexity using a convex optimization framework. Slightly less than 2/spl times/ improvement in data rate at reasonable complexity is shown to be achievable with the proposed architecture.","PeriodicalId":162046,"journal":{"name":"IEEE Global Telecommunications Conference, 2004. GLOBECOM '04.","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124330194","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: 20
Split-engine packet classification: a novel approach to multi-field packet classification on high performance routers with QoS support 分引擎包分类:一种支持QoS的高性能路由器多字段包分类的新方法
IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1378043
F. Tobajas, V. Canero, V. Armas, R. Esper-Chaín, R. Arteaga, R. Sarmiento
{"title":"Split-engine packet classification: a novel approach to multi-field packet classification on high performance routers with QoS support","authors":"F. Tobajas, V. Canero, V. Armas, R. Esper-Chaín, R. Arteaga, R. Sarmiento","doi":"10.1109/GLOCOM.2004.1378043","DOIUrl":"https://doi.org/10.1109/GLOCOM.2004.1378043","url":null,"abstract":"Classification of Internet protocol (IP) packets has become a bottleneck for the effective operation of QoS capable routers. In this paper, a novel packet classification scheme for high performance routers on different QoS architectures, named split-engine packet classification (SPC), is proposed. The key feature of the presented architecture is its ability to address a wide variety of inherently incompatible performance requirements by efficiently combining existing classification methods. To prove the validity of the proposed approach, a low cost SPC packet classifier architecture with per-flow packet treatment and dynamic resource reservation support on an OC-24 link as required by the Integrated Services framework, has been developed.","PeriodicalId":162046,"journal":{"name":"IEEE Global Telecommunications Conference, 2004. GLOBECOM '04.","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115126730","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
A reliable and efficient MAC layer broadcast (multicast) protocol for mobile ad hoc networks 一种可靠、高效的移动自组织网络MAC层广播(组播)协议
IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1378865
Chun-Yuah Chiu, E. Wu, Gen-Huey Chen
{"title":"A reliable and efficient MAC layer broadcast (multicast) protocol for mobile ad hoc networks","authors":"Chun-Yuah Chiu, E. Wu, Gen-Huey Chen","doi":"10.1109/GLOCOM.2004.1378865","DOIUrl":"https://doi.org/10.1109/GLOCOM.2004.1378865","url":null,"abstract":"Broadcast/multicast is a key service for mobile ad hoc networks. A great number of applications rely on a reliable and efficient MAC layer broadcast. The IEEE 802.11 broadcast protocol, which is based on carrier sense multiple access with collision avoidance (CSMA/CA), does not offer any MAC layer recovery on broadcast frames. Consequently, the increasing probability of lost frames may deteriorate the quality of broadcast/multicast services offered at upper layers. In this paper, we first formulate the broadcast problem as an optimization problem and show that it is NP-hard, even if the upper layer service is periodical beacons. An approximation algorithm with a guaranteed approximation ratio is also suggested. Then, a reliable and efficient MAC layer broadcast protocol, named broadcast protocol with busy tone (BPBT), is proposed. BPBT applies a busy tone to solve the hidden terminal problem. Finally, BPBT is compared with previous protocols for performance evaluation by simulation.","PeriodicalId":162046,"journal":{"name":"IEEE Global Telecommunications Conference, 2004. GLOBECOM '04.","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114897948","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
An adaptive ARQ enhancement to support multimedia traffic using 802.11 wireless LANs 自适应ARQ增强，支持使用802.11无线局域网的多媒体流量
IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1378910
J. Wall, J. Khan
{"title":"An adaptive ARQ enhancement to support multimedia traffic using 802.11 wireless LANs","authors":"J. Wall, J. Khan","doi":"10.1109/GLOCOM.2004.1378910","DOIUrl":"https://doi.org/10.1109/GLOCOM.2004.1378910","url":null,"abstract":"As the demand for broadband multimedia wireless services increases, the need to provide QoS and higher data rate enhancements to the widely deployed IEEE 802.11 wireless LAN standard has become apparent. We propose a class-based adaptive ARQ scheme with QoS support for multimedia traffic, to facilitate higher throughputs through the reduction of MAC overhead. This scheme operates on top of the EDCA (enhanced distributed channel access) mechanism proposed in the IEEE 802.11e draft standard, which provides QoS support in the MAC layer through the use of service differentiation and traffic class prioritization. An OPNET simulation model is used to show that the proposed ARQ enhancement increases system performance.","PeriodicalId":162046,"journal":{"name":"IEEE Global Telecommunications Conference, 2004. GLOBECOM '04.","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114902144","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: 13
Serially concatenated continuous phase modulation with symbol interleavers: performance, properties and design principles 带符号交织器的串接连续相位调制:性能、特性和设计原理
IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1377935
Ming Xiao, T. Aulin
{"title":"Serially concatenated continuous phase modulation with symbol interleavers: performance, properties and design principles","authors":"Ming Xiao, T. Aulin","doi":"10.1109/GLOCOM.2004.1377935","DOIUrl":"https://doi.org/10.1109/GLOCOM.2004.1377935","url":null,"abstract":"Serially concatenated continuous phase modulation (SCCPM) systems with symbol interleavers are investigated. The transmitted signals are disturbed by additive white Gaussian noise (AWGN). Iterative detection with extrinsic information is used at the receiver side. Compared to bit interleaved SCCPM systems, this scheme shows a substantial improvement in convergence threshold at the price of a higher error floor. In addition to showing this property, we also investigate the underlying reason by error event analysis. In order to estimate bit error rate performance, we generalize traditional union bounds for a bit interleaver to the non-binary interleaver. For the latter, both the order and the position of permuted non-zero symbols have to he considered. From the analysis, some principal properties are presented. Finally some design principles are proposed. The paper concentrates on SCCPM, but the proposed analysis methods and conclusions can he widely used in many other systems such as serially concatenated trellis coded modulation, et cetera.","PeriodicalId":162046,"journal":{"name":"IEEE Global Telecommunications Conference, 2004. GLOBECOM '04.","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114948784","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: 15
Multiuser channel allocation algorithms achieving hard fairness 实现硬公平的多用户信道分配算法
IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1377929
Issam Toufik, R. Knopp
{"title":"Multiuser channel allocation algorithms achieving hard fairness","authors":"Issam Toufik, R. Knopp","doi":"10.1109/GLOCOM.2004.1377929","DOIUrl":"https://doi.org/10.1109/GLOCOM.2004.1377929","url":null,"abstract":"This work investigates the performance of combined orthogonal channel and antenna allocation algorithms in multiple-antenna multi-channel systems. In (I. Toufik et al, IEEE VTC2004) a max-min allocation algorithm is proposed for an N-user system with N parallel sub-channels. Here, we extend this algorithm to the multiple-antenna systems and compare its performance in two different transmission scenarios (spatial multiplexing and space time coding). The techniques are applicable, for instance, in MIMO systems using OFDMA systems with dynamic sub-carrier allocation. We show that multiuser diversity, and thus an increase of aggregate data rates with the size of the user population, can still be successfully achieved even under a hard fairness constraint. Moreover, multiple-antennas permit spatial multiplexing. The techniques considered here do not require phase information in the channel allocation process, which, from a practical point-of-view is particularly important for time-division duplex systems exploiting channel reciprocity.","PeriodicalId":162046,"journal":{"name":"IEEE Global Telecommunications Conference, 2004. GLOBECOM '04.","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116908364","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
Dual-homing multicast protection 双归巢组播保护
IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1378132
Jianping Wang, Mei Yang, X. Qi, R. Cook
{"title":"Dual-homing multicast protection","authors":"Jianping Wang, Mei Yang, X. Qi, R. Cook","doi":"10.1109/GLOCOM.2004.1378132","DOIUrl":"https://doi.org/10.1109/GLOCOM.2004.1378132","url":null,"abstract":"We propose a novel multicast protection scheme based on a dual-homing architecture where each destination host is connected to two edge routers. Under such an architecture, the two paths from the source of the multicast session to the two edge routers provide certain protection for the data traffic from the source to the destination host. Two problems are associated with the proposed dual-homing multicast protection scheme. One is to calculate the individual survivability for a destination host that is connected to two edge routers. The other is to assign two edge routers for each destination host such that the total survivability is maximized for the multicast session subject to the port number constraint of edge routers. We propose an optimal algorithm to solve the first problem and a heuristic algorithm to solve the second problem. Through simulations, we show that the proposed heuristic algorithm achieves a performance close to the calculated lower bound.","PeriodicalId":162046,"journal":{"name":"IEEE Global Telecommunications Conference, 2004. GLOBECOM '04.","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116967377","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
A collision-controlled MAC protocol for mobile ad hoc networks and multihop wireless LANs 一种用于移动自组织网络和多跳无线局域网的冲突控制MAC协议
IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1378083
C. Yeh
{"title":"A collision-controlled MAC protocol for mobile ad hoc networks and multihop wireless LANs","authors":"C. Yeh","doi":"10.1109/GLOCOM.2004.1378083","DOIUrl":"https://doi.org/10.1109/GLOCOM.2004.1378083","url":null,"abstract":"High collision rates in multihop wireless networks constitute an issue that has to be resolved in order to achieve satisfactory application quality in such networking environments. In this paper, we propose random ID countdown with ACK (RICK) based on dual prohibition for medium access control (MAC) in ad hoc networks, multihop wireless LANs, sensor networks, and mesh networks. RICK is a new collision-controlled multiple access (CCMA) protocol that can resolve several important problems encountered in previous MACP, CCMA, or RTS/CTS-based protocols, while improving/retaining their important advantages, including strong differentiation capability and the ability to reduce the collision rate and control it to a satisfactory level.","PeriodicalId":162046,"journal":{"name":"IEEE Global Telecommunications Conference, 2004. GLOBECOM '04.","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117263313","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
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