发布求助
文献互助 智能选刊 最新文献

2009 6th International Symposium on Wireless Communication Systems最新文献

筛选
英文 中文
Cross-layer architecture for TCP splitting in the return channel over satellite networks 卫星网络返回通道中TCP分离的跨层体系结构
2009 6th International Symposium on Wireless Communication Systems Pub Date : 2009-10-13 DOI: 10.1109/ISWCS.2009.5285267
Elizabeth Rendon-Morales, Jorge Mata-Díaz, Juan J. Alins-Delgado, J. L. Muñoz, O. Esparza
{"title":"Cross-layer architecture for TCP splitting in the return channel over satellite networks","authors":"Elizabeth Rendon-Morales, Jorge Mata-Díaz, Juan J. Alins-Delgado, J. L. Muñoz, O. Esparza","doi":"10.1109/ISWCS.2009.5285267","DOIUrl":"https://doi.org/10.1109/ISWCS.2009.5285267","url":null,"abstract":"Transport protocols used in satellite networks face challenges such as variable link capacity, large propagation delay effects and packet corruption. In this paper a new cross-layer architecture for TCP splitting is proposed in the return link of geostationary satellite networks to improve the TCP performance. This new cross-layer architecture defines the interactions between layers to coordinate the TCP splitters taking into account the real-time cross-layer information. This feedback information is sent from the Return Channel Satellite Terminal to the feeder Performance Enhancement Proxy using the Simple Network Management Protocol. A complete analysis of our proposed cross-layer architecture has been carried out using NS-2 simulator to compare it with the standard TCP splitting. The simulation results show that our proposal notably reduces the transfer times for short lived connections. Moreover, it is observed that sudden variations of capacity in the return satellite channel are perfectly tracked by this new cross-layer architecture and not by the standard TCP splitting.","PeriodicalId":344018,"journal":{"name":"2009 6th International Symposium on Wireless Communication Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130900895","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: 6
Energy efficient cooperative MIMO with Idle nodes in cluster based wireless sensor networks 基于集群的无线传感器网络中具有空闲节点的高效协同MIMO
2009 6th International Symposium on Wireless Communication Systems Pub Date : 2009-09-07 DOI: 10.1109/ISWCS.2009.5285340
L. Fei, Q. Gao, Xu Zhang
{"title":"Energy efficient cooperative MIMO with Idle nodes in cluster based wireless sensor networks","authors":"L. Fei, Q. Gao, Xu Zhang","doi":"10.1109/ISWCS.2009.5285340","DOIUrl":"https://doi.org/10.1109/ISWCS.2009.5285340","url":null,"abstract":"Energy saving is a very important design consideration in wireless sensor networks. In cluster based wireless sensor networks, the energy could be saved when the nodes in a cluster that have data to transmit participate in cooperative Multiple Input Multiple Output (MIMO). In this paper, by making the idle nodes, that have no data to transmit, participate in the cooperative MIMO it is found that much more energy could be saved. The number of the idle nodes that participate in the cooperative MIMO can be optimized to minimize the total energy consumption. It is also found that the optimal number of all the nodes participating in cooperative communication does not vary with the number of nodes that have data to transmit in the cluster. The proposition is proved mathematically. The influence of long-haul distance and modulation constellation size on the total energy consumption is investigated in this paper as well.","PeriodicalId":344018,"journal":{"name":"2009 6th International Symposium on Wireless Communication Systems","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125198325","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
Multi-code SS-CSMA/CA for cluster-tree wireless ad hoc networks 多码SS-CSMA/CA用于簇树无线自组织网络
2009 6th International Symposium on Wireless Communication Systems Pub Date : 2009-09-07 DOI: 10.1109/ISWCS.2009.5285302
Naoto Kobatake, Satoru Takagishi, Y. Yamao
{"title":"Multi-code SS-CSMA/CA for cluster-tree wireless ad hoc networks","authors":"Naoto Kobatake, Satoru Takagishi, Y. Yamao","doi":"10.1109/ISWCS.2009.5285302","DOIUrl":"https://doi.org/10.1109/ISWCS.2009.5285302","url":null,"abstract":"Multi-hop delay and packet error due to packet collision are serious issues for realizing large-scale wireless ad hoc networks. A cluster-tree network can reduce multi-hop delay by limiting hop counts. However, the network suffers from bottleneck at a network sink node and it limits data throughput. Also, hidden terminals bring packet collision issues when using CSMA/CA. In this paper, spread spectrum multiple access (SSMA) employing multicode reception and CSMA/CA are combined as a new MAC protocol for solving the issues. A carrier sense method after despreading and a double-spreading code assignment method for the network are also proposed for improving the performance. Throughput and data delivery ratio for the proposed method are analyzed via simulations based on the IEEE 802.15.4/ZigBee. Simulation results show that the throughput is remarkably improved and the bottleneck at a network coordinator is mitigated with the proposed method.","PeriodicalId":344018,"journal":{"name":"2009 6th International Symposium on Wireless Communication Systems","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120975830","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
Adaptive linear interference suppression based on block conjugate gradient method in frequency domain for DS-UWB systems 基于块共轭梯度法的DS-UWB系统频域自适应线性干扰抑制
2009 6th International Symposium on Wireless Communication Systems Pub Date : 2009-09-07 DOI: 10.1109/ISWCS.2009.5285225
Sheng Li, R. D. de Lamare
{"title":"Adaptive linear interference suppression based on block conjugate gradient method in frequency domain for DS-UWB systems","authors":"Sheng Li, R. D. de Lamare","doi":"10.1109/ISWCS.2009.5285225","DOIUrl":"https://doi.org/10.1109/ISWCS.2009.5285225","url":null,"abstract":"In this work, we propose an adaptive linear interference suppression scheme based on single-carrier frequency domain equalization (SC-FDE) for multiuser direct-sequence ultra-wideband (DS-UWB) systems. In a block-by-block based transmission, by inserting the cyclic prefix (CP) between each data block, the inter-block interference (IBI) can be ignored and the Toeplitz channel matrix can be expressed as an equivalent circulant channel matrix. With this feature, we propose a simple signal model, in which only a vector formed adaptive filter needs to be trained in the frequency domain. Based on the new signal model, an adaptive block conjugate gradient (BCG) algorithm is developed. Complexity analysis shows that the proposed BCG algorithm is significantly simpler than the recursive least squares (RLS) algorithm. The bit-error rate (BER) performance of the proposed scheme is compared with the least-mean-square (LMS) and RLS algorithm in a number of scenarios and the simulation results show fast convergence speed and excellent performance of the proposed BCG algorithm.","PeriodicalId":344018,"journal":{"name":"2009 6th International Symposium on Wireless Communication Systems","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124858846","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: 8
A study on the statistical properties of double hoyt fading channels 双霍伊特衰落信道的统计特性研究
2009 6th International Symposium on Wireless Communication Systems Pub Date : 2009-09-07 DOI: 10.1109/ISWCS.2009.5285319
N. Hajri, N. Youssef, M. Pätzold
{"title":"A study on the statistical properties of double hoyt fading channels","authors":"N. Hajri, N. Youssef, M. Pätzold","doi":"10.1109/ISWCS.2009.5285319","DOIUrl":"https://doi.org/10.1109/ISWCS.2009.5285319","url":null,"abstract":"This paper deals with a study on the statistical properties of narrowband amplify-and-forward relay fading channels for Hoyt multipath propagation environments. We consider the basic radio link topology, where only one fixed relay station is used for the amplification. In this case, the envelope of the signal received over the overall multipath channel is modeled by the so-called double Hoyt fading process. Considering this multipath propagation channel model, analytical expressions for the first and second order statistics are provided. Specifically, the mean value, variance, probability density function (PDF), level-crossing rate (LCR), and average duration of fades (ADF) of double Hoyt processes are derived. In addition, an expression for the PDF of the corresponding channel phase is also provided. Since the double Rayleigh fading channel is a special case of the double Hoyt model, it will be shown how the derived expressions can be reduced to the results known for the double Rayleigh fading channel. Moreover, the validity of the derived quantities is confirmed by computer simulations.","PeriodicalId":344018,"journal":{"name":"2009 6th International Symposium on Wireless Communication Systems","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124934094","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: 27
Comparative study of fade margins with hard and soft handoff in CDMA based microcellular systems 基于CDMA的微蜂窝系统硬切换和软切换衰落边缘的比较研究
2009 6th International Symposium on Wireless Communication Systems Pub Date : 2009-09-07 DOI: 10.1109/ISWCS.2009.5285238
J. E. Rojas-Lima
{"title":"Comparative study of fade margins with hard and soft handoff in CDMA based microcellular systems","authors":"J. E. Rojas-Lima","doi":"10.1109/ISWCS.2009.5285238","DOIUrl":"https://doi.org/10.1109/ISWCS.2009.5285238","url":null,"abstract":"In this work, an analytical approach is used to study the quantitative performance regarding the fade margins improvements, as well as cell coverage issues with hard- and soft handoff for the reverse link of a CDMA based microcellular system. To determine the required fade margins for different outage probabilities and different soft handoff scenarios, the Manhattan-like street pattern is considered. Since the analysis presented here involves the comparison of propagation losses among two or more base stations due to macroscopic selection diversity used on the reverse link, the generally accepted two slope propagation model, includes a cross-correlated shadow fading component, which allows taking into consideration the dependence between two shadowing components affecting different propagation paths, since they could experience many of the same obstructions in the path profile as has been observed in field test. From numerical evaluations, it is observed that the shadowing cross-correlation is determinant in the accuracy of handoff analysis and some suggestions regarding the fade margins are proposed for planning CDMA based microcellular systems in Manhattan environments.","PeriodicalId":344018,"journal":{"name":"2009 6th International Symposium on Wireless Communication Systems","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124993722","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
Performance analysis of WiMax systems in the presence of MB-OFDM UWB interference WiMax系统在MB-OFDM UWB干扰下的性能分析
2009 6th International Symposium on Wireless Communication Systems Pub Date : 2009-09-07 DOI: 10.1109/ISWCS.2009.5285273
Eduardo Cano Pons, A. Rabbachin, J. Fortuny-Guasch
{"title":"Performance analysis of WiMax systems in the presence of MB-OFDM UWB interference","authors":"Eduardo Cano Pons, A. Rabbachin, J. Fortuny-Guasch","doi":"10.1109/ISWCS.2009.5285273","DOIUrl":"https://doi.org/10.1109/ISWCS.2009.5285273","url":null,"abstract":"The European Commission has recently adopted specific power spectral density masks for Ultra Wideband devices, with detect and avoid capabilities, for coexistence with licensed standards. Under these regulations, a novel approach for analysing the Ultra Wideband interference effects on the WiMax downlink is provided in this paper. The maximum permissible interference level, as well as the signal-to-interference level that allows the Ultra Wideband interference effects to be considered as negligible, are computed by means of analytical, numerical and experimental approaches. This analysis considers a WiMax receiver operating at its minimum sensitivity level. The bit error rate and the error vector magnitude of the WiMax link are the metrics employed in this work to characterise the interference effects for both frequency hopping and non-frequency hopping Ultra Wideband interferers.","PeriodicalId":344018,"journal":{"name":"2009 6th International Symposium on Wireless Communication Systems","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116025147","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: 10
Some corrections and new results from a scheme to improve TCP over wireless networks 一种改进无线网络TCP协议的方案的一些修正和新结果
2009 6th International Symposium on Wireless Communication Systems Pub Date : 2009-09-07 DOI: 10.1109/ISWCS.2009.5285329
L. D. Mendes, J. Brito
{"title":"Some corrections and new results from a scheme to improve TCP over wireless networks","authors":"L. D. Mendes, J. Brito","doi":"10.1109/ISWCS.2009.5285329","DOIUrl":"https://doi.org/10.1109/ISWCS.2009.5285329","url":null,"abstract":"Many models for TCP Throughput Prediction were proposed in the literature. However, the first ones only considered the most common networks at that time: wired networks. Thus, these models could not predict the behavior of a network that included wireless links. Also, different Link Layer protocols had to be considered, resulting in different modifications of the former throughput prediction models. During our research on TCP Models, we have found an interesting modification including ARQ, which is one of our objects of study. Also, this modification proposed a new frame retransmission scheme, which could reduce the TCP segment loss probability in a wireless link. However, when we tried to use this modified model, some errors appeared. For instance, the equation to calculate the average frame retransmissions number did not consider all the error possibilities. Thus, we decided to make some corrections in order to use this model in future works. Based on the corrected model, new comparisons were made and new conclusions, different from the original ones, were achieved.","PeriodicalId":344018,"journal":{"name":"2009 6th International Symposium on Wireless Communication Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129814358","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
Hybrid, optical and wireless near-gigabit communications system 混合光学和无线近千兆通信系统
2009 6th International Symposium on Wireless Communication Systems Pub Date : 2009-09-07 DOI: 10.1109/ISWCS.2009.5285250
L. Rakotondrainibe, Y. Kokar, G. Zaharia, G. E. Zein, E. Tanguy, Li Hongwu, B. Charbonnier
{"title":"Hybrid, optical and wireless near-gigabit communications system","authors":"L. Rakotondrainibe, Y. Kokar, G. Zaharia, G. E. Zein, E. Tanguy, Li Hongwu, B. Charbonnier","doi":"10.1109/ISWCS.2009.5285250","DOIUrl":"https://doi.org/10.1109/ISWCS.2009.5285250","url":null,"abstract":"This paper presents the study and the realization of a hybrid 60 GHz wireless communications system. As the 60 GHz radio link operates only in a single-room configuration, an additional Radio over Fibre (RoF) link is used to ensure the communications in all the rooms of a residential environment. A single carrier architecture is adopted. The system uses low complexity baseband processing modules. A byte/frame synchronization technique is designed to provide a high value of the preamble detection probability and a very small value of the false alarm probability. Conventional RS (255, 239) encoder and decoder are used to correct errors in the transmission channel. Results of Bit Error Rate (BER) measurements are presented for various antennas configurations.","PeriodicalId":344018,"journal":{"name":"2009 6th International Symposium on Wireless Communication Systems","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128493532","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
On two cross-layer assisted resource allocation schemes in multiuser multicarrier systems 多用户多载波系统中两种跨层辅助资源分配方案
2009 6th International Symposium on Wireless Communication Systems Pub Date : 2009-09-07 DOI: 10.1109/ISWCS.2009.5285282
Qing Bai, J. Nossek
{"title":"On two cross-layer assisted resource allocation schemes in multiuser multicarrier systems","authors":"Qing Bai, J. Nossek","doi":"10.1109/ISWCS.2009.5285282","DOIUrl":"https://doi.org/10.1109/ISWCS.2009.5285282","url":null,"abstract":"Resource allocation (RA) is a crucial task in the operation of wireless communication systems, which in many cases aims at meeting the users' quality of service (QoS) requirements with the minimum amount of resources. In this work, we consider the QoS-provisioning RA problem at the downlink of a multicarrier system, where the total transmit power consumption is to be minimized. Two RA schemes, one employing Lagrange dual methods and a greedy primal recovery scheme, and the other heuristic with a three-step approach, are proposed under the same cross-layer framework, where power allocation, adaptive modulation and coding as well as retransmission protocols are jointly modeled. Though both suboptimal, the two schemes are advantageous for their low complexity and small amount of online computations required. Their performances are illustrated and compared based on simulation results. The work also provides a quantitative comparison on the two commonly used retransmission protocols, namely automatic repeat request (ARQ) and hybrid automatic repeat request (HARQ).","PeriodicalId":344018,"journal":{"name":"2009 6th International Symposium on Wireless Communication Systems","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123838764","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: 6
下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信