Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE最新文献_第2页

Quasi-orthogonal space-time block codes with full diversity 具有全分集的准正交空时分组码

Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE Pub Date : 2002-12-01 DOI: 10.1109/GLOCOM.2002.1188366

Weifeng Su, X. Xia

{"title":"Quasi-orthogonal space-time block codes with full diversity","authors":"Weifeng Su, X. Xia","doi":"10.1109/GLOCOM.2002.1188366","DOIUrl":"https://doi.org/10.1109/GLOCOM.2002.1188366","url":null,"abstract":"Space-time block codes from orthogonal designs proposed by Alamouti (1998), and Tarokh-Jafarkhani-Calderbank (199) have attracted much attention lately due to their fast maximum-likelihood (ML) decoding and full diversity. However, the maximum symbol transmission rate of a space-time block code from complex orthogonal designs for complex constellations is only 3/4 for three and four transmit antennas. Jafarkhani (see IEEE Trans. Commun., vol.49, no.1, p.1-4, 2001), and Tirkkonen-Boariu-Hottinen (see ISSSTA 2000, pp.429-432, September 2000) proposed space-time block codes from quasi-orthogonal designs, where the orthogonality is relaxed to provide higher symbol transmission rates. With the quasi-orthogonal structure, these codes still have a fast ML decoding, but do not have the full diversity. In this paper, we design quasi-orthogonal space-time block codes with full diversity by properly choosing the signal constellations. In particular, we propose that half symbols in a quasi-orthogonal design are from a signal constellation A and another half of them are optimal selections from the rotated constellation e/sup j/spl phi// A. The optimal rotation angles /spl phi/ are obtained for some commonly used signal constellations. The resulting codes have both full diversity and fast ML decoding.","PeriodicalId":415837,"journal":{"name":"Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115933361","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: 43

Performance of cellular CDMA with voice/data traffic with an SIR based admission control 具有基于SIR的允许控制的话音/数据流量的蜂窝CDMA性能

Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE Pub Date : 2002-11-21 DOI: 10.1109/GLOCOM.2002.1188207

S. Anand, A. Chockalingam

引用次数: 2

Long-range dependence: now you see it, now you don't! 长期依赖:你时而看到，时而看不到!

Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE Pub Date : 2002-11-20 DOI: 10.1109/GLOCOM.2002.1189015

T. Karagiannis, M. Faloutsos, R. Riedi

{"title":"Long-range dependence: now you see it, now you don't!","authors":"T. Karagiannis, M. Faloutsos, R. Riedi","doi":"10.1109/GLOCOM.2002.1189015","DOIUrl":"https://doi.org/10.1109/GLOCOM.2002.1189015","url":null,"abstract":"Over the last few years, the network community has started to make heavy use of novel concepts such as self-similarity and long-range dependence (LRD). Despite their wide use, there is still much confusion regarding the identification of such phenomena in real network traffic data. We show that estimating long-range dependence is not straightforward: there is no systematic or definitive methodology. There exist several estimating methodologies, but they can give misleading and conflicting estimates. More specifically, we arrive at several conclusions that could provide guidelines for a systematic approach to LRD. First, long-range dependence may exist, even if the estimators have different estimates of the Hurst exponent in the interval 0.5-1. Second, long-range dependence is unlikely to exist, if there are several estimators that fail to estimate the Hurst exponent. Third, we show that periodicity can obscure the analysis of a signal giving partial evidence of long-range dependence. Fourth, the Whittle estimator is the most accurate in finding the exact value when LRD exists, but it can be fooled easily by periodicity. As a case-study, we analyze real round-trip time data. We find and remove a periodic component from the signal, before we can identify long-range dependence in the remaining signal.","PeriodicalId":415837,"journal":{"name":"Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127286181","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: 98

Analysis of the RAKE receiver performance in low spreading gain DS/SS systems 低扩频增益DS/SS系统中RAKE接收机性能分析

Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE Pub Date : 2002-11-17 DOI: 10.1109/GLOCOM.2002.1188194

C. Unger, G. Fettweis

引用次数: 14

Impact of power control error on the outage probability of 2D-RAKE receivers in Nakagami fading channels Nakagami衰落信道中功率控制误差对2D-RAKE接收机中断概率的影响

Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE Pub Date : 2002-11-17 DOI: 10.1109/GLOCOM.2002.1188508

Kaizhi Huang, Jing Wang, Youzheng Wang, Guoan Chen

引用次数: 0

An efficient packet fair queueing (PFQ) architecture for latency rate server 针对延迟率服务器提出了一种高效的分组公平排队(PFQ)体系结构

Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE Pub Date : 2002-11-17 DOI: 10.1109/GLOCOM.2002.1189065

Haitao Wu, Shiduan Cheng, Jian Ma

引用次数: 0

On the effect of very large nodes in Internet graphs 互联网图中超大节点的影响

Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE Pub Date : 2002-11-17 DOI: 10.1109/GLOCOM.2002.1189105

H. Reittu, I. Norros

引用次数: 15

2 GHz outdoor to indoor propagation at high elevation angles for mobile communications served by high altitude platform stations 2ghz高仰角室外到室内传播，用于高海拔台站提供的移动通信

Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE Pub Date : 2002-11-17 DOI: 10.1109/GLOCOM.2002.1188522

D. Axiotis, M. Theologou

引用次数: 5

Approximations to joint-ML and ML symbol-channel estimators in MUD CDMA MUD CDMA中联合ML和ML符号信道估计器的近似

Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE Pub Date : 2002-11-17 DOI: 10.1109/GLOCOM.2002.1188107

T. Fabricius, O. Nørklit

引用次数: 6

Bluetooth scatternet with a master/slave bridge: a queueing theoretic analysis 具有主从桥接的蓝牙散射网:排队理论分析

Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE Pub Date : 2002-11-17 DOI: 10.1109/GLOCOM.2002.1188070

V. Mišić, J. Misic

引用次数: 11