... IEEE Global Communications Conference. IEEE Global Communications Conference最新文献_第10页

Power saving protocol for 10G- EPON systems: A proposal and performance evaluations 10G- EPON系统的节能协议:建议和性能评估

... IEEE Global Communications Conference. IEEE Global Communications Conference Pub Date : 2012-12-01 DOI: 10.1109/GLOCOM.2012.6503596

Nga T. Dinh, A. Elwalid

{"title":"Power saving protocol for 10G- EPON systems: A proposal and performance evaluations","authors":"Nga T. Dinh, A. Elwalid","doi":"10.1109/GLOCOM.2012.6503596","DOIUrl":"https://doi.org/10.1109/GLOCOM.2012.6503596","url":null,"abstract":"Reducing power consumption in access networks has become an increasingly important design goal due to increased concerns for both global warming and network operation costs. Although passive optical networks (PONs) consume the least power among all access network technologies, it is desirable to further reduce PON's power consumption, especially when the line rate is being increased to 10Gbps (10G) and wider deployment is underway. Generally, an effective approach to reduce power consumption is to use sleep-mode operation where functionality is powered off during periods of idleness. This paper therefore proposes a sleep-mode based power saving protocol applied to an optical line terminal (OLT) and optical network units (ONUs) to implement ONU power saving in 10G-Ethernet-PON (10G-EPON) systems. The proposed protocol explicitly distinguishes sleep-, listen-, and awake- states with different power consumption levels. In addition, the paper proposes analytical models for ONU power consumption and response delay to evaluate performance of the proposed power saving protocol. The simulations show that the proposed protocol can significantly improve ONU power saving. The validity of the numerical models is also confirmed by extensive simulations.","PeriodicalId":72021,"journal":{"name":"... IEEE Global Communications Conference. IEEE Global Communications Conference","volume":"53 1","pages":"3135-3140"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90993002","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: 12

Low-complexity PAPR reduction algorithm in OFDM systems by designing data subcarriers 设计数据子载波的OFDM系统低复杂度PAPR降低算法

... IEEE Global Communications Conference. IEEE Global Communications Conference Pub Date : 2012-01-01 DOI: 10.1109/GLOCOM.2012.6503869

Si Liu, B. Liu, Xiaoqiang Ma, Bo Rong, Lin Gui

引用次数: 1

Sequential search of available channels in cognitive radios 认知无线电中可用信道的顺序搜索

... IEEE Global Communications Conference. IEEE Global Communications Conference Pub Date : 2010-12-01 DOI: 10.1109/GLOCOMW.2010.5700118

Ruben de Francisco

{"title":"Sequential search of available channels in cognitive radios","authors":"Ruben de Francisco","doi":"10.1109/GLOCOMW.2010.5700118","DOIUrl":"https://doi.org/10.1109/GLOCOMW.2010.5700118","url":null,"abstract":"In cognitive radios, spectrum sensing is employed as a means to increase spectrum usage awareness. Spectrum sensing algorithms must satisfy the desired performance requirements, in terms of probability of detection and false alarm, with short sensing duration. In addition, low-complexity algorithms are sought, particularly in low-power cognitive radios. A mechanism to search available channels in the frequency domain is proposed in this paper. Rather than obtaining an accurate estimation of the spectrum within a certain frequency range, we focus here on the task of finding white spaces. The proposed technique is a steepest descent method, adapted to the problem of sensing white spaces. Based on an approximation on the right and left derivatives of a smoothed periodogram, the algorithm iteratively searches for a free channel by following the direction of steepest descent. The adaptation step is such that the algorithm produces large steps in flat spectrum regions and small steps in steep regions, in order not to miss narrow portions of the spectrum with free channels. Simulations are provided for the proposed algorithm in a scenario where IEEE 802.11g and IEEE 802.15.4 devices coexist. The performance and speed of convergence of the proposed algorithm are shown, providing a comparison with a system that performs random channel search.","PeriodicalId":72021,"journal":{"name":"... IEEE Global Communications Conference. IEEE Global Communications Conference","volume":"449 3 1","pages":"1162-1166"},"PeriodicalIF":0.0,"publicationDate":"2010-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77904930","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

Packet Loss Differentiation Using Network Layer Packet Redundancy in Optical Packet/Burst Switched Networks 基于网络层数据包冗余的光分组/突发交换网络丢包区分

... IEEE Global Communications Conference. IEEE Global Communications Conference Pub Date : 2009-11-30 DOI: 10.1109/GLOCOM.2009.5426312

Harald Ø verby

引用次数: 1

A Low-Complexity Beamforming-Based Scheduling for Downlink OFDMA/SDMA Systems with Multimedia Traffic 基于低复杂度波束形成的下行OFDMA/SDMA系统多媒体业务调度

... IEEE Global Communications Conference. IEEE Global Communications Conference Pub Date : 2009-11-30 DOI: 10.1109/GLOCOM.2009.5426219

Wen-Ching Chung, Li-Chun Wang, Chung-Ju Chang

引用次数: 7

Analyzing Two Conflicting Objectives of the WDM Lightpath Reconfiguration Problem WDM光路重构问题的两个冲突目标分析

... IEEE Global Communications Conference. IEEE Global Communications Conference Pub Date : 2009-01-01 DOI: 10.1109/GLOCOM.2009.5426108

F. S. Donado

引用次数: 2

Iterative Receiver Design with Joint Channel Estimation and Synchronization for Coded MIMO-OFDM over Doubly Selective Channels 双选择信道编码MIMO-OFDM联合信道估计与同步的迭代接收机设计

... IEEE Global Communications Conference. IEEE Global Communications Conference Pub Date : 2009-01-01 DOI: 10.1109/GLOCOM.2009.5425733

H. Nguyen-Le, T. Le-Ngoc, N. Tran

{"title":"Iterative Receiver Design with Joint Channel Estimation and Synchronization for Coded MIMO-OFDM over Doubly Selective Channels","authors":"H. Nguyen-Le, T. Le-Ngoc, N. Tran","doi":"10.1109/GLOCOM.2009.5425733","DOIUrl":"https://doi.org/10.1109/GLOCOM.2009.5425733","url":null,"abstract":"The paper introduces a turbo (iterative) receiver design for joint channel estimation, synchronization and soft decoding in convolutional-coded multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems over timeand frequency-selective (doubly selective) channels. Employing the complex-exponential basis expansion model (CE-BEM) for representing doubly selective channels, a maximum likelihood (ML) objective function of carrier frequency offset (CFO) and MIMO time-varying channel responses (BEM coefficients) is formulated to develop a semiblind ML framework for joint time-variant channel estimation and synchronization. To reduce the overhead of pilot signals without sacrificing estimation accuracy, the soft bit information from a soft-input soft-output (SISO) decoder is exploited in computing soft estimates of data symbols to be functioned as pilots for further enhancing the estimation accuracy after CFO and channel acquisition phase (initial coarse estimation) using pilots. In other words, the resulting semi-blind ML estimation scheme operates in conjunction with soft decoding process in a (iteratively) progressive manner to exploit remarkable gains of turbo processing (iterative extrinsic information exchange). Simulation results show that the proposed turbo joint channel estimation and synchronization scheme offers high estimation accuracy that approaches Cramér-Rao lower bounds (CRLBs) over a wide range of CFO values under low signal-to-noise ratio (SNR) conditions.","PeriodicalId":72021,"journal":{"name":"... IEEE Global Communications Conference. IEEE Global Communications Conference","volume":"2 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2009-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85485578","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 New Cooperative Localization Method for UMTS Cellular Networks 一种新的UMTS蜂窝网络协同定位方法

... IEEE Global Communications Conference. IEEE Global Communications Conference Pub Date : 2008-12-08 DOI: 10.1109/GLOCOM.2008.ECP.458

F. Piccolo

{"title":"A New Cooperative Localization Method for UMTS Cellular Networks","authors":"F. Piccolo","doi":"10.1109/GLOCOM.2008.ECP.458","DOIUrl":"https://doi.org/10.1109/GLOCOM.2008.ECP.458","url":null,"abstract":"The ETSI/3GPP standardization body has defined a general location services (LCS) UMTS architecture which i) provides assistance data for mobile phones equipped with satellite navigation receivers and ii) is able to localize mobile phones not equipped with satellite navigation receivers or out of coverage. Nevertheless, the most of the already deployed systems for location-based services either assume that UMTS mobile phones are equipped with satellite navigation receivers and limit themselves to collect and transmit assistance data, or derive the position of mobile phones from the identifier of the serving cells. As the accuracy of methods based on cell identifiers depends on the size of the serving cell and it may drop to even few kilometers in case of macrocells, this paper considers the localization problem still unsolved for the UMTS mobile phones not equipped with satellite navigation receivers or out of coverage. To solve this problem, this paper proposes a new cooperative localization method for UMTS cellular networks. The idea arises from the observation that an ever increasing number of UMTS mobile phones will have an integrated satellite navigation receiver and will be able to position themselves. Thus, the proposed method consists in using the ETSI/3GPP LCS architecture to allow mobile phones without satellite navigation receivers or out of coverage to estimate their position by performing power measurements on signals emitted by mobile phones with satellite navigation receivers and known-position1.","PeriodicalId":72021,"journal":{"name":"... IEEE Global Communications Conference. IEEE Global Communications Conference","volume":"1 1","pages":"2383-2387"},"PeriodicalIF":0.0,"publicationDate":"2008-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83472771","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: 24

Generalized Differential Transmission for STBC Systems STBC系统的广义差动传输

... IEEE Global Communications Conference. IEEE Global Communications Conference Pub Date : 2008-01-01 DOI: 10.1109/GLOCOM.2008.ECP.836

Liangbin Li, Z. Fang, Y. Zhu, Zongxin Wang

引用次数: 0

RECHOKe: A Scheme for Detection, Control and Punishment of Malicious Flows in IP Networks RECHOKe:一种侦测、控制与惩罚IP网路中恶意流量的方案

... IEEE Global Communications Conference. IEEE Global Communications Conference Pub Date : 2007-12-26 DOI: 10.1109/GLOCOM.2007.11

V. Govindaswamy, G. Záruba, G. Balasekaran

引用次数: 23