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2009 European Wireless Conference最新文献

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Spectrum allocation and medium access in cognitive radio wireless networks 认知无线电无线网络中的频谱分配与介质接入
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357757
Z. Fan, Rocky Zhang
{"title":"Spectrum allocation and medium access in cognitive radio wireless networks","authors":"Z. Fan, Rocky Zhang","doi":"10.1109/EW.2009.5357757","DOIUrl":"https://doi.org/10.1109/EW.2009.5357757","url":null,"abstract":"This paper1 focuses on spectrum allocation and medium access in future cognitive radio wireless networks, e.g. IEEE 802.22 networks. For a given network topology, the proposed spectrum allocation method first generates an interference graph (or conflict graph) based on the network topology, traffic flows and interference constraints. Then a graph coloring algorithm is applied to the interference graph and the chromatic number of the graph is obtained. This number is the minimum number of distinct spectrum slices required. Further, spectrum allocation is done based on the max-min fair share algorithm or proportional fair algorithm according to the spectrum demands for different spectrum blocks. For medium access among secondary users, we then describe and implement a MAC protocol for 802.22-type cognitive radio networks. Simulation results are presented to demonstrate its effectiveness.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127844549","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: 15
Performance evaluation of non-ideal RF transmitter in LTE/LTE-Advanced systems LTE/LTE- advanced系统中非理想射频发射机的性能评估
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5358002
C. Galiotto, Yonghui Huang, N. Marchetti, M. Zorzi
{"title":"Performance evaluation of non-ideal RF transmitter in LTE/LTE-Advanced systems","authors":"C. Galiotto, Yonghui Huang, N. Marchetti, M. Zorzi","doi":"10.1109/EW.2009.5358002","DOIUrl":"https://doi.org/10.1109/EW.2009.5358002","url":null,"abstract":"The Long Term Evolution (LTE) and LTE-Advanced (LTE-A) standards are under development for the next generation mobile communication systems. High peak data rates and high spectral efficiency are some of the requirements of these standards, which should also include Flexible Spectrum Usage (FSU) techniques for an efficient use of the limited available bandwidth (BW). Considering Non-Contiguous Orthogonal Frequency Division Multiplexing (NC-OFDM) as a possible FSU proposal for LTE/LTE-Advanced, in this paper an analysis of the effects of the RF imperfections —such as IQ imbalance, phase noise and non-linear power amplifier— on the downlink transmission in LTE/LTE-Advanced is presented. Two different aspects are pointed out. First, concerning NC-OFDM, it is shown that the RF transmitter causes an increase of the Power Spectral Density (PSD) in the subchannels not used for transmission, which means interference with the other systems using those subchannels. Second, concerning the high data rates and high spectral efficiency, it turns out that the 64-QAM rate 3/4, used to reach these requirements, is deeply affected by the RF transmitter imperfections.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"32 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115419891","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
Proposal of an error sequence generator applied to the performance analysis of IEEE 802.16 一种应用于IEEE 802.16性能分析的错误序列发生器的设计
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357988
Rafael Kunst, C. Both, L. Granville, Juergen Rochol
{"title":"Proposal of an error sequence generator applied to the performance analysis of IEEE 802.16","authors":"Rafael Kunst, C. Both, L. Granville, Juergen Rochol","doi":"10.1109/EW.2009.5357988","DOIUrl":"https://doi.org/10.1109/EW.2009.5357988","url":null,"abstract":"RF channels are affected by time and frequency variant conditions caused by physical impairments that lead to the occurrence of errors during the transmission. These errors are basically of two types: burst errors and random errors. Simulating the behavior of RF channels affected by physical impairments has been subject of several investigations in the past years. Nevertheless, researches generally do not consider the occurrence of both errors at the same time. The current approach to simulate RF channel behavior may lead to imprecisions on the results. In order to deal with this limitation, this paper proposes an hybrid error sequence generator, which is able of generating both burst and random error sequences. The proposed error sequence generator is applied to a case study that aims to evaluate the performance of the channel encoder of the IEEE 802.16 networks. The outcomes of the experiments show that using an hybrid model reflects better the realistic behavior of RF channels.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131367053","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
A novel traffic splitting policy for performance improvement in wireless mesh networks 一种改进无线网状网络性能的流量分流策略
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357990
Hongzhi Jiao, F. Li
{"title":"A novel traffic splitting policy for performance improvement in wireless mesh networks","authors":"Hongzhi Jiao, F. Li","doi":"10.1109/EW.2009.5357990","DOIUrl":"https://doi.org/10.1109/EW.2009.5357990","url":null,"abstract":"Wireless mesh networks are expected to play an important role in the next-generation wireless communication systems as it can provide wide coverage and scalable broadband Internet access services. However, as more traffic is injected into the network it may lead to throughput degradation, packet loss and longer transmission delay. In this paper, we argue that network performance can be improved by cross-layer design over multiple layers and load balancing based on service types. Correspondingly, a novel traffic splitting policy which can potentially utilize diverse paths for transmitting traffic flows of different service types from the same router has been proposed and investigated. Such a policy is able to balance traffic load, ideally aggregate capacities across multiple paths and leverage diversity among the paths to achieve low packet loss and more stable throughput.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124026000","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
Implementation and performance analysis of cooperative Medium Access Control protocol for CSMA/CA based technologies 基于CSMA/CA技术的协同介质访问控制协议的实现与性能分析
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5358009
A. Grauballe, M. Jensen, A. Paramanathan, F. Fitzek, T. Madsen
{"title":"Implementation and performance analysis of cooperative Medium Access Control protocol for CSMA/CA based technologies","authors":"A. Grauballe, M. Jensen, A. Paramanathan, F. Fitzek, T. Madsen","doi":"10.1109/EW.2009.5358009","DOIUrl":"https://doi.org/10.1109/EW.2009.5358009","url":null,"abstract":"In this paper we investigate three different MAC protocols based on CSMA/CA in terms of throughput and channel access delay. The investigation is based on analytical models and real implementations on a testbed developed for this purpose. While the first MAC approach is alike IEEE802.11, the other two approaches are based on packet aggregation per node and on cooperative approaches. It can be shown that the two novel MAC schemes are increasing the throughput compared to the standard CSMA/CA approach, but only the cooperative approach is resulting in lower channel access delays.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124924850","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
Energy evaluation for Bluetooth link layer packet selection scheme 蓝牙链路层分组选择方案的能量评估
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5358003
G. P. Perrucci, M. Pedersen, T. Madsen, F. Fitzek
{"title":"Energy evaluation for Bluetooth link layer packet selection scheme","authors":"G. P. Perrucci, M. Pedersen, T. Madsen, F. Fitzek","doi":"10.1109/EW.2009.5358003","DOIUrl":"https://doi.org/10.1109/EW.2009.5358003","url":null,"abstract":"This paper is investigating the energy saving potential of Bluetooth. Using the asynchronous connectionless link (ACL) for data transmission, Bluetooth provides different packet types, namely DM and DH packets. Each packet has a different payload size and in the actual implementation the packet selection is based on the channel conditions. In this paper we present and discuss results of a measurements campaign that we have made on commercial mobile phones. We show that energy savings can be achieved by selecting the appropriate packet type in an energy aware manner, by forcing the phone to use a specific packet type.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115698447","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: 4
User fairness analysis of a game theory based power allocation scheme in OFDMA relay systems 基于博弈论的OFDMA中继系统功率分配方案的用户公平性分析
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5358000
Lin Xiao, Tiankui Zhang, L. Cuthbert
{"title":"User fairness analysis of a game theory based power allocation scheme in OFDMA relay systems","authors":"Lin Xiao, Tiankui Zhang, L. Cuthbert","doi":"10.1109/EW.2009.5358000","DOIUrl":"https://doi.org/10.1109/EW.2009.5358000","url":null,"abstract":"In this paper, the performance of user fairness of resource allocation is considered in the downlink of relay-based OFDMA cellular systems. In the downlink transparent frame structure, the base stations (BSs) transmit in the first time subslot and the relay stations (RSs) transmit in the second time subslot. A non-cooperative power allocation game is defined for maximizing throughput and reducing co-frequency interference. The distributed process of this game based power allocation scheme is given. Of particular interest in the results is the fairness seen by users and this is compared with equal power allocation, the simulation results showing that the reduced user fairness is worthwhile due to a great power saving.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114816550","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
Key re-establishment protocols in hierarchical wireless sensor networks 分层无线传感器网络中的密钥重建协议
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357989
An-Ni Shen, Song Guo
{"title":"Key re-establishment protocols in hierarchical wireless sensor networks","authors":"An-Ni Shen, Song Guo","doi":"10.1109/EW.2009.5357989","DOIUrl":"https://doi.org/10.1109/EW.2009.5357989","url":null,"abstract":"Many applications of wireless sensor network require secure data communications, especially in a hostile environment. In order to protect the sensitive data and the sensor readings, secret keys should be used to encrypt the exchanged messages between communicating nodes. Traditional asymmetric key cryptosystems are infeasible in WSN due to its low capacity at each senor node. In this paper, we propose a new key distribution scheme for hierarchical WSNs with renewable network devices. Compared to some of the existing schemes, our methods possess the following features that are particularly beneficial to the resource-constrained large-scale WSNs: (1) robustness to the node capture attack, (2) flexibility on key establishment for adding new network devices, (3) scalability in terms of storage cost, and (4) low communication overhead.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114821136","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
Cross-layer architecture for adaptive real-time multimedia in heterogeneous network environment 异构网络环境下自适应实时多媒体的跨层体系结构
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357979
E. Piri, T. Sutinen, J. Vehkapera
{"title":"Cross-layer architecture for adaptive real-time multimedia in heterogeneous network environment","authors":"E. Piri, T. Sutinen, J. Vehkapera","doi":"10.1109/EW.2009.5357979","DOIUrl":"https://doi.org/10.1109/EW.2009.5357979","url":null,"abstract":"Despite the interest, the utilization of today's networking environment including a variety of access technologies and various services and capabilities is still minimal. Multiaccess mobile devices already on the market provide a capability to hand over the heterogeneous networks but so far there has not been any commonly approved way to efficiently capitalize on this feature. Media Independent Handover Services standard specified by the IEEE 802.21 working group is expected to establish the basis for heterogeneous handovers. Although IEEE 802.21 has usage also beyond heterogeneous handovers, its capabilities do not fulfill all the requirements of adaptive multimedia transmission. For example, upper layer events and end-to-end traffic control communication are outside the scope of IEEE 802.21. In this study, we introduce an information service architecture for adaptive multimedia which enables to collect and disseminate events and information from the different layers of the protocol stack locally and also between network entities regardless of their location in the network. Our architecture presents a Triggering Engine on top of the IEEE 802.21 services in order to introduce upper layer events, flexibility to event distribution, and end-to-end event based signaling to adaptive multimedia transmission.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"492 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115861184","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: 18
Flexible scheduling for Real-Time services in High-Speed Packet Access cellular networks 高速分组接入蜂窝网络中实时业务的灵活调度
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357977
M. Andreozzi, G. Stea, Andrea Bacioccola, Roberto Rossi
{"title":"Flexible scheduling for Real-Time services in High-Speed Packet Access cellular networks","authors":"M. Andreozzi, G. Stea, Andrea Bacioccola, Roberto Rossi","doi":"10.1109/EW.2009.5357977","DOIUrl":"https://doi.org/10.1109/EW.2009.5357977","url":null,"abstract":"This paper presents the HYbrid Channel-Aware and Real-Time scheduler (HY-CART) for UMTS High-Speed Packet Access networks. The latter works for both downlink and uplink scheduling, with slightly different embodiments due to the different technology constraints. Its basic principle is to select users based on their channel conditions when the deadlines are far ahead: as the deadlines approach, they become progressively more important. Furthermore, resources for scheduled users are allocated sparingly, i.e. enough to serve packets whose deadline is actually near, so as to make room for a possibly larger number of simultaneous users, and keeping into account the user channel state. Simulative evaluation shows that HY-CART performs better than the previous work, allowing more users to be served with the same resources.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"20 15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116718946","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
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