2010 IEEE International Conference on Communications Workshops最新文献_第4页

Performance Evaluation of a CCA Application for VANETs Using IEEE 802.11p 基于IEEE 802.11p的vanet CCA应用性能评估

2010 IEEE International Conference on Communications Workshops Pub Date : 2010-05-23 DOI: 10.1109/ICCW.2010.5503939

J. Tomás-Gabarrón, E. Egea-López, J. García-Haro, Rocío Murcia-Hernández

引用次数: 20

Effects of Antenna Characteristics and Placements on a Vehicle-to-Vehicle Channel Scenario 天线特性和位置对车对车信道场景的影响

2010 IEEE International Conference on Communications Workshops Pub Date : 2010-05-23 DOI: 10.1109/ICCW.2010.5503935

D. Kornek, M. Schack, E. Slottke, O. Klemp, I. Rolfes, T. Kurner

引用次数: 33

Joint Estimation of Carrier Frequency Offset and Channel Complex Gains for OFDM Systems in Fast Time-Varying Vehicular Environments 快速时变车辆环境下OFDM系统载波频偏和信道复增益的联合估计

2010 IEEE International Conference on Communications Workshops Pub Date : 2010-05-23 DOI: 10.1109/ICCW.2010.5503938

E. Simon, Hussein Hijazi, L. Ros, M. Berbineau, P. Degauque

{"title":"Joint Estimation of Carrier Frequency Offset and Channel Complex Gains for OFDM Systems in Fast Time-Varying Vehicular Environments","authors":"E. Simon, Hussein Hijazi, L. Ros, M. Berbineau, P. Degauque","doi":"10.1109/ICCW.2010.5503938","DOIUrl":"https://doi.org/10.1109/ICCW.2010.5503938","url":null,"abstract":"In this paper, the physical nature of the radio-channel is considered by using an $L$-path channel model to developing an algorithm for OFDM systems operating in fast time-varying vehicular environment. Assuming the path delays are known, a novel iterative pilot-aided algorithm for joint estimation of multi-path Rayleigh channel complex gains and Carrier Frequency Offset (CFO) is introduced. Each complex gain time-variation, within one OFDM symbol, is approximated by a Basis Expansion Model (BEM) representation. An auto-regressive (AR) model is built for the parameters to be estimated (the AR model for the BEM coefficients is based on the Jakes process). The algorithm performs recursive estimation using Extended Kalman Filtering. Hence, the channel matrix is easily computed, and the data symbol is estimated with free inter-sub-carrier-interference (ICI) when the channel matrix is QR-decomposed. It is shown that only one iteration is sufficient to achieve the performance of the ideal case where knowledge of channel response and CFO is available.","PeriodicalId":422951,"journal":{"name":"2010 IEEE International Conference on Communications Workshops","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128797818","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

Residual-Energy-Activated Cooperative Transmission (REACT) to Avoid the Energy Hole 避免能量空洞的剩余能量激活协同传输(REACT)

2010 IEEE International Conference on Communications Workshops Pub Date : 2010-05-23 DOI: 10.1109/ICCW.2010.5503966

Jin Woo Jung, M. A. Ingram

引用次数: 53

Scalability Issues of the MAC Methods STDMA and CSMA of IEEE 802.11p When Used in VANETs IEEE 802.11p的MAC方法STDMA和CSMA在vanet中的可扩展性问题

2010 IEEE International Conference on Communications Workshops Pub Date : 2010-05-23 DOI: 10.1109/ICCW.2010.5503941

Katrin Sjoberg Bilstrup, E. Uhlemann, E. Strom

{"title":"Scalability Issues of the MAC Methods STDMA and CSMA of IEEE 802.11p When Used in VANETs","authors":"Katrin Sjoberg Bilstrup, E. Uhlemann, E. Strom","doi":"10.1109/ICCW.2010.5503941","DOIUrl":"https://doi.org/10.1109/ICCW.2010.5503941","url":null,"abstract":"Position messages will be the foundation for many emerging traffic safety applications based on wireless communications. These messages contain information about the vehicle's position, speed, direction, etc. and are broadcasted periodically by each vehicle. The upcoming IEEE 802.11p standard, intended for vehicle ad hoc networks (VANETs) has flaws caused by the unpredictable behavior of its medium access control (MAC) scheme, which imply that traffic safety applications cannot be supported satisfactorily when the network load increases. We study the MAC mechanism within IEEE 802.11p being a carrier sense multiple access (CSMA) algorithm and compare it with a self-organizing time division multiple access (STDMA) scheme when used for broadcasting periodic position messages in a real-istic highway scenario. We investigate their scalability in terms of the number of vehicles that the VANET can support using met-rics such as channel access delay, probability of concurrent transmissions and interference distance. The results show that STDMA outperforms CSMA of 802.11p even when the network is not saturated.","PeriodicalId":422951,"journal":{"name":"2010 IEEE International Conference on Communications Workshops","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129043580","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: 81

Power and Interference Control with Relaying in Cooperative Cognitive Radio Networks 协同认知无线电网络中继功率与干扰控制

2010 IEEE International Conference on Communications Workshops Pub Date : 2010-05-23 DOI: 10.1109/ICCW.2010.5503878

Weng-Chon Ao, Shin-Ming Cheng, Kwang-Cheng Chen

引用次数: 6

Use of Data Replication in WSNs Directed to Special Needs 针对特殊需求的无线传感器网络中数据复制的使用

2010 IEEE International Conference on Communications Workshops Pub Date : 2010-05-23 DOI: 10.1109/ICCW.2010.5503914

V. Leithardt, C. Geyer, J. Sá Silva, Rafael Ferreira da Silva

引用次数: 4

Evaluating the Usefulness of Watchdogs for Intrusion Detection in VANETs 评估监督机构在vanet中入侵检测的有效性

2010 IEEE International Conference on Communications Workshops Pub Date : 2010-05-23 DOI: 10.1109/ICCW.2010.5503946

Jorge Hortelano, J. Ruiz, P. Manzoni

引用次数: 107

Cluster Transmission Time Synchronization for Cooperative Transmission Using Software-Defined Radio 基于软件定义无线电的协同传输集群时间同步

2010 IEEE International Conference on Communications Workshops Pub Date : 2010-05-23 DOI: 10.1109/ICCW.2010.5503961

Yong Jun Chang, M. A. Ingram, R. Frazier

{"title":"Cluster Transmission Time Synchronization for Cooperative Transmission Using Software-Defined Radio","authors":"Yong Jun Chang, M. A. Ingram, R. Frazier","doi":"10.1109/ICCW.2010.5503961","DOIUrl":"https://doi.org/10.1109/ICCW.2010.5503961","url":null,"abstract":"Abstract-We consider the time synchronization of concurrent transmissions from a cluster of cooperating software-defined radios (SDRs). In this type of cooperative transmission (CT), each cooperating node derives its timing autonomously from a signal received from a source or another cluster. Timing errors, caused by SDR processing delays, cause excessively high delay spreads of the signal received at the destination node. To reduce these timing errors, we propose that relays use embedded time stamps to hold the packet for a fixed period before firing. The method has been implemented in an indoor non-line-of-sight channel, for a twohop network (source-cluster-destination), using 64 kbps BFSK, non-coherent demodulation, and up to four diversity channels based on orthogonal carriers. The bit error rate (BER) and the measured cumulative distribution function (CDF) for the rms transmit time spreads (RTTSs) are presented, as functions of transmit power and number of cooperators. Mean RTTSs on the order of 50 ns are achieved. Also presented are the results of a “ping pong” experiment, in which a packet is transmitted back and forth between two clusters. CDFs of the RTTS for the first 10 hops are given, showing stable statistics after the second hop.","PeriodicalId":422951,"journal":{"name":"2010 IEEE International Conference on Communications Workshops","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128933118","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: 49

Cooperative Relaying with Feedback for Lifetime Maximization 寿命最大化的反馈合作中继

2010 IEEE International Conference on Communications Workshops Pub Date : 2010-05-23 DOI: 10.1109/ICCW.2010.5503899

I. Krikidis, J. Thompson, P. Grant

引用次数: 21