2009 European Wireless Conference最新文献

Subcarrier allocation in OFDMA with time varying channel and packet arrivals 具有时变信道和数据包到达的OFDMA子载波分配

2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357997

Engin Toktas, E. Uysal-Biyikoglu, A. O. Yılmaz

引用次数: 5

Feasibility study of downlink transmission with 256 QAM based on results of MBWA system field trial 基于MBWA系统现场试验结果的256 QAM下行传输可行性研究

2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357999

S. Kameda, H. Oguma, T. Takagi, K. Tsubouchi, N. Izuka, Y. Asano, Y. Yamazaki

引用次数: 8

Frequency Domain receivers for IEEE 802.15.4a short range communication systems 用于IEEE 802.15.a短距离通信系统的频域接收机

2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357998

S. Morosi, T. Bianchi, Francesco Gei

引用次数: 2

Multipath mitigation performance of multi-correlator based code tracking algorithms in closed and open loop model 开闭环模型下基于多相关器的代码跟踪算法的多径抑制性能

2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357986

M. Z. H. Bhuiyan, Xuan Hu, E. Lohan, M. Renfors

引用次数: 12

Hybrid satellite/terrestrial cooperative relaying strategies for DVB-SH based communication systems 基于DVB-SH通信系统的卫星/地面混合协同中继策略

2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357991

S. Morosi, E. Del Re, S. Jayousi, R. Suffritti

引用次数: 18

Product of shifted exponential variates and outage capacity of multicarrier systems 多载波系统的移指数变量与中断容量的乘积

2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357980

F. Yilmaz, Mohamed-Slim Alouini

引用次数: 52

Optimal sensing cooperation for spectrum sharing in cognitive radio networks 认知无线电网络中频谱共享的最优感知合作

2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357760

Yan Zhang, J. Xiang, Qin Xin, G. Oien

{"title":"Optimal sensing cooperation for spectrum sharing in cognitive radio networks","authors":"Yan Zhang, J. Xiang, Qin Xin, G. Oien","doi":"10.1109/EW.2009.5357760","DOIUrl":"https://doi.org/10.1109/EW.2009.5357760","url":null,"abstract":"Cognitive radio is a highly promising technology to efficiently solve the spectrum scarcity challenge and harmonize the networks heterogeneity. Through component spectrum sharing, secondary users (SUs) are able to opportunistically access licensed spectrum shared with the primary system. In the literature, spectrum sharing is normally investigated on the basis of the assumption that the spectrum sensing is perfect. However, in reality, the spectrum sensing can not be ideal, as demonstrated by two non-zero metrics, probability of misdetection and the probability of false alarm. In this paper, we focus on the interaction between spectrum sensing and spectrum sharing. In particular, we will study the optimization of cooperative spectrum sensing for achieving maximum spectrum utilization in cognitive radio networks. A new percentage rule is proposed for the spectrum sensing cooperation, which is more generic than quantity-based rules and is applicable in both sparse and dense sensing scenarios. An analytical model is presented to analyze the spectrum sharing performance. Numerical examples are presented to show the optimal percentage of cooperating sensors in achieving maximum utilization, which simultaneously achieve minimum blocking probabilities. Results are also shown to explore the impact of key system parameters on the performance metrics.","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":"131242299","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

The m-n distribution - A new closed-form physical channel fading model and performance of M-ary modulations m-n分布——一种新的封闭物理信道衰落模型及m-n调制的性能

2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357970

F. Yilmaz, O. Kucur

引用次数: 4

Improved codebook design for precoding of OSTBCs in correlated MIMO channels with finite rate feedback 有限速率反馈相关MIMO信道中ostbc预编码的改进码本设计

2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357994

Lu Lu, Gang Wu, Haiyang Huang, Shaoqian Li, F. Sun

引用次数: 1

Distributed wakeup scheduling scheme for supporting periodic traffic in wsns 支持周期性业务的分布式唤醒调度方案

2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357978

Osama Khader, A. Willig, A. Wolisz

{"title":"Distributed wakeup scheduling scheme for supporting periodic traffic in wsns","authors":"Osama Khader, A. Willig, A. Wolisz","doi":"10.1109/EW.2009.5357978","DOIUrl":"https://doi.org/10.1109/EW.2009.5357978","url":null,"abstract":"In many applications in wireless sensor network source nodes generate and send periodic traffic to the sink through a number of forwarder nodes. In such a multihop network forwarders have forwarding duties but should, on the other hand, to spend as much time as possible in an energy-saving deep-sleep mode. In this work we explore decentralized approach to organize the wake-up process of the forwarders with the aim to let them wakeup at “just the right time” to catch an incoming packet, forward it and go quickly back to sleep mode. A key assumption for this work is that the forwarders do not know the traffic period beforehand, but they have to estimate the period and maintain their estimate over time. A key difficulty is that the period estimation and the scheduling of wakeup times will have to deal with jitter in the packet inter-arrival times. If a packet arrives before the forwarder wakes up, it is lost. This opens up a tradeoff between loss rates and the sleeping activities of the forwarder: when the forwarder wakes up “early”, the packet loss rate will be low but the forwarder spends more energy, and vice versa. The main contributions of this report are the following ones: (a) we design and implement local estimators for traffic period and jitter; (b) we design and implement a scheduling scheme by which a forwarder locally decides when to sleep and when to wakeup; and (c) we adjoin mechanisms to this scheme that allow to update the period and jitter estimates and to react to changes in the locally observed loss rate. We use measurements and simulation to evaluate our proposed algorithms.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"22 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":"125584827","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: 48