2010 European Wireless Conference (EW)最新文献_第4页

Do decode-and-forward relaying protocols beat transmit diversity? 解码转发中继协议胜过传输分集吗?

2010 European Wireless Conference (EW) Pub Date : 2010-04-12 DOI: 10.1109/EW.2010.5483434

T. Renk, H. Jaekel, F. Jondral, A. Goldsmith

引用次数: 4

Performance analysis of a two-relay assisted transmission scheme 双继电器辅助传输方案的性能分析

2010 European Wireless Conference (EW) Pub Date : 2010-04-12 DOI: 10.1109/EW.2010.5483404

Pascale Fouillot, I. Icart, C. L. Le Martret

引用次数: 5

Boosting sphere decoding speed through Graphic Processing Units 通过图形处理单元提高球体解码速度

2010 European Wireless Conference (EW) Pub Date : 2010-04-12 DOI: 10.1109/EW.2010.5483399

M. S. Khairy, C. Mehlführer, M. Rupp

引用次数: 17

The influence of severity of fading on the statistical properties of the capacity of Nakagami-m channels with MRC and EGC 衰落严重程度对MRC和EGC下Nakagami-m信道容量统计特性的影响

2010 European Wireless Conference (EW) Pub Date : 2010-04-12 DOI: 10.1109/EW.2010.5483507

G. Rafiq, V. Kontorovich, M. Patzold

{"title":"The influence of severity of fading on the statistical properties of the capacity of Nakagami-m channels with MRC and EGC","authors":"G. Rafiq, V. Kontorovich, M. Patzold","doi":"10.1109/EW.2010.5483507","DOIUrl":"https://doi.org/10.1109/EW.2010.5483507","url":null,"abstract":"In this article, we have studied the statistical properties of the capacity of Nakagami-m channels when spatial diversity combining, such as maximal ratio combining (MRC) and equal gain combining (EGC), is employed at the receiver. The presented results provide insight into the statistical properties of the channel capacity under a wide range of fading conditions in wireless links using L-branch diversity combining techniques. We have derived closed-form analytical expressions for the probability density function (PDF), cumulative distribution function (CDF), level-crossing rate (LCR), and average duration of fades (ADF) of the channel capacity. The statistical properties of the capacity are studied for different values of the number of diversity branches and for different severity levels of fading. The analytical results are verified with the help of simulations. It is observed that increasing the number of diversity branches increases the mean channel capacity, while the variance and ADF of the channel capacity decreases. Moreover, systems in which the fading in diversity branches is less severe (as compared to Rayleigh fading) have a higher mean channel capacity. The presented results are very helpful to optimize the design of the receiver of wireless communication systems that employ spatial diversity combining.","PeriodicalId":232165,"journal":{"name":"2010 European Wireless Conference (EW)","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115712232","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

Evaluation of spectrum opportunities in the GSM band GSM频段频谱机会的评估

2010 European Wireless Conference (EW) Pub Date : 2010-04-12 DOI: 10.1109/EW.2010.5483438

Andrea Carniani, L. Giupponi, R. Verdone

{"title":"Evaluation of spectrum opportunities in the GSM band","authors":"Andrea Carniani, L. Giupponi, R. Verdone","doi":"10.1109/EW.2010.5483438","DOIUrl":"https://doi.org/10.1109/EW.2010.5483438","url":null,"abstract":"In this paper we explore the possibility of exploiting underutilized channels in the GSM bands. The secondary (unlicensed) users of the spectrum are the nodes of an overlay cognitive ad-hoc network, which opportunistically transmits in data channels left unused by the primary (licensed) system. The fundamental constraints for the secondary system are: 1) it uses the time slots/frequency channels (i.e. data channels) unused by the primary GSM system, 2) its operation does not degrade the performances of the primary system, 3) there is no exchange of signalling information between the primary and the secondary system to facilitate the secondary usage of spectrum, that is, the primary users are not cognitive aware. The focus is on the feasibility of the proposed approach, so that we consider a system level simulator based on a realistic GSM network deployed in the city of Bologna. In this context we evaluate the impact that the operation of the secondary users has on the performances of the primary system. In addition, we study the performances that can be obtained by the secondary system under the condition of marginal interference to the primary system. We will show that an appropriate choice of the frequency channel, makes the secondary usage of spectrum a valid approach to increase the operator's spectrum efficiency.","PeriodicalId":232165,"journal":{"name":"2010 European Wireless Conference (EW)","volume":"267 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114458942","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 Simple and Robust Dissemination protocol for VANETs 一种简单而稳健的VANETs传播协议

2010 European Wireless Conference (EW) Pub Date : 2010-04-12 DOI: 10.1109/EW.2010.5483419

Ramon S. Schwartz, R. Barbosa, N. Meratnia, G. Heijenk, H. Scholten

引用次数: 30

Opportunistic vehicular routing 机会车辆路线

2010 European Wireless Conference (EW) Pub Date : 2010-04-12 DOI: 10.1109/EW.2010.5483530

Kevin C. Lee, M. Gerla

{"title":"Opportunistic vehicular routing","authors":"Kevin C. Lee, M. Gerla","doi":"10.1109/EW.2010.5483530","DOIUrl":"https://doi.org/10.1109/EW.2010.5483530","url":null,"abstract":"In a wireless ad hoc network, an opportunistic routing strategy is a strategy where there is no predefined rule for choosing the next node to destination (as it is the case in conventional schemes such as OLSR, DSR or even Geo-Routing). Rather, an intermediate node en route acts in an impromptu fashion and takes a decision that is based solely on current circumstances. A popular example of opportunistic routing is the “delay tolerant” forwarding to “data mules” when a direct path to destination does not exist. Conventional routing in this case would just “drop” the packet. With opportunistic routing, a node acts upon the available information: it seeks the neighbor best qualified to “carry” the packet to destination. If none is available, it will await the right opportunity. This procedure is also known as “data muling” or Delay Tolerant Network (DTN) routing. The Vehicular Ad Hoc Networks (VANET), because of its intrinsic intermittent connectivity (during off peak hours and at night) is an ideal “playground” for opportunistic routing/multicast. In this paper we will examine two examples of VANET opportunistic routing: Delay Tolerant geo-inspired routing and real time video stream multicast of emergency/accident multimedia reports to vehicles in disconnected platoons using network coding.","PeriodicalId":232165,"journal":{"name":"2010 European Wireless Conference (EW)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122939099","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: 38

A stochastic-gradient method to design optimal space-time codes for MIMO radar detection 一种随机梯度法设计MIMO雷达探测最优空时码

2010 European Wireless Conference (EW) Pub Date : 2010-04-12 DOI: 10.1109/EW.2010.5483418

L. Venturino, Ke Dong, Xiaodong Wang, M. Lops

引用次数: 3

Sink mobility schemes for data extraction in large scale WSNs under single or zero hop data forwarding 单跳或零跳数据转发下大规模WSNs数据提取的Sink迁移方案

2010 European Wireless Conference (EW) Pub Date : 2010-04-12 DOI: 10.1109/EW.2010.5483528

Leonidas Tzevelekas, I. Stavrakakis

{"title":"Sink mobility schemes for data extraction in large scale WSNs under single or zero hop data forwarding","authors":"Leonidas Tzevelekas, I. Stavrakakis","doi":"10.1109/EW.2010.5483528","DOIUrl":"https://doi.org/10.1109/EW.2010.5483528","url":null,"abstract":"A mobile sink is widely considered to facilitate the data collection from energy constrained sensor fields, by having the sink come close to the sensors and conserving precious sensor node energy. The effectiveness of such a data collection approach can be measured in terms of the sensor energy conserved and the time required to collect the sensor data from the field (or, equivalently, the length of the trajectory implemented by the mobile sink). In this paper we explore two important dimensions in the design of mobile sink-based data collection schemes. One dimension refers to how close to the sensor nodes the sink moves to, to collect the data, which impacts on the transmission energy expenditure by the sensor node. The other dimension refers to the way the sink moves through the sensor field, to collect the data, which impacts on the delay in collecting the data. To capture the first dimension, the 0-hop and 1-hop data collection schemes are considered and studied; at the same time, two ”extreme” approaches to the sink mobility process are considered: a (topology unaware) random walk-based sink mobility scheme and a (topology aware, optimal) deterministic sink mobility scheme. Through the analytic and simulative study presented in this paper, an understanding of the level of the trade-offs involved between the energy spent by the sensor nodes and the delay in completing the data collection process is obtained.","PeriodicalId":232165,"journal":{"name":"2010 European Wireless Conference (EW)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123702762","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: 11

LTE-Advanced: The mainstream in mobile broadband evolution LTE-Advanced:移动宽带演进的主流

2010 European Wireless Conference (EW) Pub Date : 2010-04-12 DOI: 10.1109/EW.2010.5483512

Matti Kiiski

引用次数: 31