IEEE Global Telecommunications Conference, 2004. GLOBECOM '04.最新文献_第6页

Index-server optimization for P2P file sharing in mobile ad hoc networks 移动自组织网络中P2P文件共享的索引服务器优化

IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1378102

C. Ohta, Zihui Ge, Yang Guo, J. Kurose

{"title":"Index-server optimization for P2P file sharing in mobile ad hoc networks","authors":"C. Ohta, Zihui Ge, Yang Guo, J. Kurose","doi":"10.1109/GLOCOM.2004.1378102","DOIUrl":"https://doi.org/10.1109/GLOCOM.2004.1378102","url":null,"abstract":"In this paper, we compare two basic approaches towards providing peer-to-peer file-sharing (or more generally, information search) in mobile ad-hoc networks (MANET). The flooding approach broadcasts a query (e.g., to locate a node holding a given file) to all network nodes. The index-server approach adds additional servers (known as index servers) that cache directory information about which nodes have which files. With index servers, a node wishing to locate a file first queries its local index server, which then queries other index servers, as needed. The use of index servers presents the possibility of locating a file index quickly in an index server cache, but requires additional overhead to maintain cache consistency. We compare the performance of the flooding approach to two index-server caching approaches: consistent caching and local caching. We quantify the reduction in search overhead using the index-server scheme rather than flooding in MANET, and study how the optimal number of index servers varies according to network size, query rate, and index generation rate. We compare the flooding scheme and the consistent caching and local caching schemes, for two types of queries: history queries and latest queries. Numerical results show how one can choose between the alternatives of consistent caching and local caching depending on network size, index generation rate and query rate.","PeriodicalId":162046,"journal":{"name":"IEEE Global Telecommunications Conference, 2004. GLOBECOM '04.","volume":"22 11","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113942820","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

Jointly optimum power and bandwidth allocation for multi-rate FDM and FDMA over overloaded channels 多速率FDM和FDMA在过载信道上的联合优化功率和带宽分配

IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1377947

Joon Ho Cho, Q. Zhang

引用次数: 4

Voice capacity of IEEE 802.11b, 802.11a and 802.11g wireless LANs IEEE 802.11b、802.11a和802.11g无线局域网的语音容量

IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1378242

K. Medepalli, P. Gopalakrishnan, D. Famolari, T. Kodama

引用次数: 154

Impact of peer-to-peer applications on wide area network traffic: an experimental approach 点对点应用对广域网流量的影响:一种实验方法

IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1378241

Nadia Ben Azzouna, F. Guillemin

引用次数: 33

State correction after re-routing with reduced state resource reservation protocols 使用减少的状态资源保留协议重路由后的状态修正

IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1378082

A. Császár, Attila Takács, R. Szabó, T. Henk

引用次数: 8

Multiple hypothesis channel estimation for the MIMO-OFDM system MIMO-OFDM系统的多假设信道估计

IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1378490

Kyeong Jin Kim, T. Reid

引用次数: 5

Adaptive selection of surviving symbol replica candidates based on maximum reliability in QRM-MLD for OFCDM MIMO multiplexing OFCDM MIMO复用中基于最大可靠性的QRM-MLD存活符号副本候选自适应选择

IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1378453

K. Higuchi, H. Kawai, N. Maeda, M. Sawahashi

{"title":"Adaptive selection of surviving symbol replica candidates based on maximum reliability in QRM-MLD for OFCDM MIMO multiplexing","authors":"K. Higuchi, H. Kawai, N. Maeda, M. Sawahashi","doi":"10.1109/GLOCOM.2004.1378453","DOIUrl":"https://doi.org/10.1109/GLOCOM.2004.1378453","url":null,"abstract":"The paper proposes an adaptive selection algorithm for surviving symbol replica candidates based on the maximum reliability in ML detection with QR decomposition and M-algorithm (QRM-MLD) for OFCDM MIMO multiplexing. In the proposed algorithm, symbol replica candidates newly-added at each stage are ranked for each surviving symbol replica from the previous stage using multiple quadrant detection. Then, branch metrics are calculated only for the limited number of symbol replica candidates with high reliability based on an iterative loop in increasing order of the accumulated branch metrics from the candidate with the minimum one. Simulation results show that the computational complexity of the proposed algorithm from the viewpoint of the number of real multiplications is reduced to approximately 1/6 and 1/1900, respectively, compared to that of the original QRM-MLD and that of the conventional MLD with squared Euclidian distance calculations for all symbol replica candidates, assuming the identical achievable average block error rate (BLER) performance in 4-by-4 MIMO multiplexing with 16QAM data modulation. The results also show that 1-Gbps throughput is achieved at the E/sub b//N/sub 0/ per receiver antenna of approximately 9 dB using the adaptive selection algorithm in QRM-MLD associated with 16QAM modulation and turbo coding with coding rate of 8/9, assuming a 100-MHz bandwidth for a twelve-path Rayleigh fading channel (rms delay spread, 0.26 /spl mu/sec; maximum Doppler frequency, 20 Hz).","PeriodicalId":162046,"journal":{"name":"IEEE Global Telecommunications Conference, 2004. GLOBECOM '04.","volume":"3 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":"132419861","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: 94

Low-density generator matrix codes for indoor and Markov channels 用于室内和马尔可夫信道的低密度发生器矩阵代码

IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1377997

H. Lou, J. Garcia-Frías

引用次数: 2

Delay analysis of application level multicast on content addressable networks 内容可寻址网络中应用层组播的时延分析

IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1378160

Sugata Hazarika, D. Towsley

引用次数: 2

Channel utilization and loss rate in a single-wavelength fibre delay line (FDL) buffer 单波长光纤延迟线(FDL)缓冲器中的信道利用率和损失率

IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Pub Date : 2004-11-29 DOI: 10.1109/GLOCOM.2004.1378323

B. V. Houdt, K. Laevens, J. Lambert, C. Blondia, H. Bruneel

引用次数: 16