The Second International Conference on Communications and Networking最新文献_第2页

A femtocells ressources allocation scheme in OFDMA based networks 一种基于OFDMA网络的飞蜂窝资源分配方案

The Second International Conference on Communications and Networking Pub Date : 2010-11-01 DOI: 10.1109/COMNET.2010.5699812

Ghayet El Mouna Zhioua, S. Hamouda, P. Godlewski, S. Tabbane

{"title":"A femtocells ressources allocation scheme in OFDMA based networks","authors":"Ghayet El Mouna Zhioua, S. Hamouda, P. Godlewski, S. Tabbane","doi":"10.1109/COMNET.2010.5699812","DOIUrl":"https://doi.org/10.1109/COMNET.2010.5699812","url":null,"abstract":"In this paper, we propose a new dynamic frequency assignment scheme for femtoCells in OFDMA networks. The femtoCell base stations are small cellular base stations specially designed to improve the poor indoor coverage and increase the system capacity for cellular and wireless broadband networks. However, these femto-base stations cause harmful interference to the macroCells. Therefore, the optimization of the radio resource allocation to femtoCells is essential to decrease the femtoCell to macroCell interferences and to offer better QoS for both femtoCell and macroCell users. Our dynamic frequency assignment scheme is based on sharing the same radio resources with macroCells which avoids resources' waste while condemning particular channels to femtoCells' deployment. Moreover, our scheme assigns the “quietest” channels to femtoCells according to the received power level. Hence, femto-BSs and macro-BSs radio resources' share could be achieved without introducing serious interference. Simulation results show the efficiency of our frequency assignment scheme. The average achievable throughput of both macroCell and femtoCell users is increased by more than 20% when compared to that obtained under a common assignment scheme.","PeriodicalId":444734,"journal":{"name":"The Second International Conference on Communications and Networking","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124778781","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

XML access control: from XACML to annotated schemas XML访问控制:从XACML到带注释的模式

The Second International Conference on Communications and Networking Pub Date : 2010-11-01 DOI: 10.1109/COMNET.2010.5699810

Ryma Abassi, M. Rusinowitch, Florent Jacquemard, S. G. El Fatmi

引用次数: 13

A proxy-based framework for QoS-enabled Internet access in VANETS VANETS中基于代理的支持qos的互联网访问框架

The Second International Conference on Communications and Networking Pub Date : 2010-11-01 DOI: 10.1109/COMNET.2010.5699820

A. Ksentini, H. Tounsi, Mounir Frikha

{"title":"A proxy-based framework for QoS-enabled Internet access in VANETS","authors":"A. Ksentini, H. Tounsi, Mounir Frikha","doi":"10.1109/COMNET.2010.5699820","DOIUrl":"https://doi.org/10.1109/COMNET.2010.5699820","url":null,"abstract":"A Vehicle Ad hoc Network (VANET) is composed of vehicles, with short range wireless communication capabilities. Vehicular networks can support both Vehicle-to-Vehicle and Vehicle-to-Infrastructure communications, and are targeted at the delivery of both road safety applications and non-safety applications, including comfort applications. Comfort applications aim to provide information and entertainment to people on traveling. These applications are typically bandwidth-demanding, have real time delivery requirements, and ask for the network capability to offer continuous access to the Internet together with a controlled Quality of service (QoS). To better cope with the dynamic nature of this network, the IEEE 802.11p has been proposed as a draft amendment to the IEEE 802.11 standard. Its core mechanism is based on the Enhanced Distributed Channel Access (EDCA) for QoS management. VANET-to-Internet access needs the cooperation of certain elements of the network to serve as gateways, to choose the optimal route for them and maintain it, and to ensure users preferences and requirements of QoS. One of the challenges in VANET-to-Internet communication is how to provide connection in areas where no gateways are available. In this paper, we introduce a new QoS framework to ensure data forwarding to Internet in gateway-free area. It consists of a Proxy-based Vehicle to Internet (PVI) protocol, with a Prediction-based Routing (PBR) algorithm and IEEE 802.11p EDCA scheme.","PeriodicalId":444734,"journal":{"name":"The Second International Conference on Communications and Networking","volume":"64 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129576838","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 very efficient time and frequency synchronization method for OFDM systems operating in AWGN channels 一种在AWGN信道中运行的OFDM系统的非常有效的时间和频率同步方法

The Second International Conference on Communications and Networking Pub Date : 2010-11-01 DOI: 10.1109/COMNET.2010.5699808

Leila Nasraoui, Leila Najjar Atallah, M. Siala

{"title":"A very efficient time and frequency synchronization method for OFDM systems operating in AWGN channels","authors":"Leila Nasraoui, Leila Najjar Atallah, M. Siala","doi":"10.1109/COMNET.2010.5699808","DOIUrl":"https://doi.org/10.1109/COMNET.2010.5699808","url":null,"abstract":"In this paper, we propose an efficient scheme using a new single-symbol preamble structure for OFDM data-aided synchronization. The preamble symbol is constituted of two successive equal-duration sub-symbols, the second one of which is a differentially encoded version of the first one, using an adequately designed precoding sequence. This structure leads to almost perfect channel autocorrelation profile with sharp in-phase peak and zero out-of-phase correlation. For comparison, we review some previous methods also based on data-aided synchronization for OFDM systems. We here explore the performance of the new method in the case of the AWGN channel. The performance is presented in terms of correct frame start detection rate and estimator's variance for time estimation. For fractional frequency offset estimation, the performance is evaluated in terms of mean squared error. The obtained results prove that the accuracy of the frame start detection and the fractional frequency offset estimation are greatly enhanced, even at very low SNRs. We show that compared to the best benchmark, gains of about 5 dB and 20 dB are achieved for timing precision of one sample and of one tenth of a sample, respectively. We also show that for a target correct detection rate of 95%, our approach provides more than 17 dB gain with respect to the best benchmark. Although we concentrate here on OFDM, the proposed approach can be applied to other systems such as TDMA or CDMA.","PeriodicalId":444734,"journal":{"name":"The Second International Conference on Communications and Networking","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115028823","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: 9

Investigation of Sign Of Innovation - Particle Filter tracking performance in ad hoc noisy binary WSN 创新标志——粒子滤波在自组织噪声二值WSN中的跟踪性能研究

The Second International Conference on Communications and Networking Pub Date : 2010-11-01 DOI: 10.1109/COMNET.2010.5699813

F. Aounallah, R. Amara, M. Turki-Hadj Alouane

引用次数: 0

Closed form expression for the Cramér-Rao lower bound for the DOA estimates from spatially and temporally correlated narrowband signals considering noncircular sources 考虑非圆源的时空相关窄带信号DOA估计的cram<s:1> r- rao下界的封闭表达式

The Second International Conference on Communications and Networking Pub Date : 2010-11-01 DOI: 10.1109/COMNET.2010.5699831

Sonia Ben Hassen, A. Samet, F. Bellili, S. Affes

{"title":"Closed form expression for the Cramér-Rao lower bound for the DOA estimates from spatially and temporally correlated narrowband signals considering noncircular sources","authors":"Sonia Ben Hassen, A. Samet, F. Bellili, S. Affes","doi":"10.1109/COMNET.2010.5699831","DOIUrl":"https://doi.org/10.1109/COMNET.2010.5699831","url":null,"abstract":"In this paper, we derive for the first time an explicit expression for the stochastic Cramér-Rao lower bound (CRLB or CRB) of the DOA estimates from spatially and temporally correlated signals generated from noncircular sources. The new CRB is compared to those of circular temporally correlated and noncircular independent and identically distributed (iid) signals. It will be shown that the CRB obtained assuming both noncircular sources and temporally correlated signals is lower than the CRBs derived considering only one of these two assumptions. This illustrates the potential gain that both the noncircularity and the temporal correlation provide when considered together. It will also be proved that the difference between the three CRBs increases with the number of snapshots. However, as the signal-to-noise ratio (SNR) increases, the CRBs merge together and decrease linearly. Moreover, we notice that in low SNR values the temporal correlation is more informative about the unknown DOA parameters than the noncircularity. Finally, we show the dependence of the CRB on the noncircularity rate, the noncircularity phase separation and the DOA separation.","PeriodicalId":444734,"journal":{"name":"The Second International Conference on Communications and Networking","volume":"402 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122786756","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: 2

Evaluation of the blocking probability and the throughput in the uplink of wireless cellular networks 无线蜂窝网络上行链路中阻塞概率和吞吐量的评估

The Second International Conference on Communications and Networking Pub Date : 2010-11-01 DOI: 10.1109/COMNET.2010.5699702

M. Karray

引用次数: 19

Impact of Hierarchical Modulation on Proportional Fair in OFDMA-based networks ofdma网络中分层调制对比例公平的影响

The Second International Conference on Communications and Networking Pub Date : 2010-11-01 DOI: 10.1109/COMNET.2010.5699815

A. Jdidi, T. Chahed

引用次数: 7

GoP-based fluid Markovian modelling of video traffic 基于gopv的视频流量流体马尔可夫建模

The Second International Conference on Communications and Networking Pub Date : 2010-11-01 DOI: 10.1109/COMNET.2010.5699804

Wassim Abbessi, H. Nabli

引用次数: 4

A study of email usage and performance over Cellular technology 基于蜂窝技术的电子邮件使用和性能研究

The Second International Conference on Communications and Networking Pub Date : 2010-11-01 DOI: 10.1109/COMNET.2010.5699823

A. Hafsaoui, G. Urvoy-Keller, D. Collange, M. Siekkinen

{"title":"A study of email usage and performance over Cellular technology","authors":"A. Hafsaoui, G. Urvoy-Keller, D. Collange, M. Siekkinen","doi":"10.1109/COMNET.2010.5699823","DOIUrl":"https://doi.org/10.1109/COMNET.2010.5699823","url":null,"abstract":"In this paper we investigate the performance of Cellular networks, focusing on the key mail and webmail services. Specifically, the primary motivation of this research is to compare mail and webmail performance and to discuss different factors that affect performance as perceived by end users. We discuss key factors related to the network configurations, e.g., proxies, that can bias the computation of performance metrics, e.g., RTT. For Webmail, we are able to further characterize webmail servers and client devices including the operating systems (OS) of the devices. In our trace, Hotmail is the most popular service and represents 23% of all webmail connections. As for users' device, the Iphone of Apple drives the market and thus appears by far the most commonly used end user device. While mail generates more TCP connections than webmail, it represents less bytes. We show that webmail achieves higher throughputs than legacy mail. We investigate this difference of throughputs and uncover several key factors that explain this difference. In particular, we demonstrate that while losses can have a detrimental impact for both mail and webmail, it impacts more the former. Also, the mail application (mail client and server) significantly impacts the way data is exchanged and thus the throughput.","PeriodicalId":444734,"journal":{"name":"The Second International Conference on Communications and Networking","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131341515","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