2008 14th European Wireless Conference最新文献

Impact of mean user speed on blocking and cuts of streaming traffic in cellular networks 蜂窝网络中平均用户速度对流流量阻塞和切断的影响

2008 14th European Wireless Conference Pub Date : 2008-06-22 DOI: 10.1109/EW.2008.4623911

B. Błaszczyszyn, M. Karray

{"title":"Impact of mean user speed on blocking and cuts of streaming traffic in cellular networks","authors":"B. Błaszczyszyn, M. Karray","doi":"10.1109/EW.2008.4623911","DOIUrl":"https://doi.org/10.1109/EW.2008.4623911","url":null,"abstract":"This paper deals with the performance evaluation of wireless cellular networks serving streaming traffic. In contrast to data traffic, streaming users require predefined transmission rates, which can be maintained at the price of blocking of some arrivals or cutting some existing connections when a network congestion occurs. The fractions of blocked and cut transmissions in the long run of the system, called respectively, blocking and cut probabilities, are the main performance metrics of such networks. In this paper we evaluate the impact of the intra-and extra-cell user mobility on these metrics. Specifically, we assume a spatio-temporal Poisson arrival process of streaming calls, independent Markovian mobility and exponential duration of each call. The dynamics of this free (offered) process is modified each time a congestion-generating transition occurs. We consider two possible modifications, which lead to two different loss models. We study both of them, and in particular, we propose some explicit approximations for the blocking and cut probabilities, which take into account the mean user mobility speed. We illustrate our approach studying UMTS release 99 building upon the scalable admission control schemes developed previously, which allow for an exact representation of the geometry of interference in the network.","PeriodicalId":237850,"journal":{"name":"2008 14th European Wireless Conference","volume":"519 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123123782","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

Energy balance in cooperative Wireless Sensor Network 协同无线传感器网络中的能量平衡

2008 14th European Wireless Conference Pub Date : 2008-06-22 DOI: 10.1109/EW.2008.4623879

L. Bai, Lian Zhao, Z. Liao

{"title":"Energy balance in cooperative Wireless Sensor Network","authors":"L. Bai, Lian Zhao, Z. Liao","doi":"10.1109/EW.2008.4623879","DOIUrl":"https://doi.org/10.1109/EW.2008.4623879","url":null,"abstract":"The design of wireless sensor networks (WSNs) should focus on energy efficiency since wireless sensor nodes work on limited batteries, which are difficult or impossible to replace in most situations. However, the performance of WSNs is adversely impacted by fading effects, which requires much energy to combat for a high bit error rate (BER) requirement. On the other hand, since the transmit energy is proportional to transmit distance, energy imbalance is caused by the different distances to the base station (BS). Sensor nodes far from the BS consume much more energy than those close to the BS and may die out quickly, which shortens the lifetime or results in a malfunction of the WSN. Reducing the proportion of transmit energy in total energy consumption helps minimize the differences in transmit energy among sensor nodes. Cooperative transmission has been proven to be an effective way to combat the impacts of fading by obtaining diversity gains and therefore, reduces the transmit energy. In this paper, we first apply cooperative transmission in WSNs, which not only reduces energy consumption but also lessens the differences of energy consumption among sensor nodes. To further balance energy among sensor nodes, we apply different cluster size and simulation results show that unequal cluster size improves energy balancing.","PeriodicalId":237850,"journal":{"name":"2008 14th European Wireless Conference","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114664531","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: 20

3G HSDPA evolution: MIMO and 64QAM performance in macrocellular deployments 3G HSDPA演进:大蜂窝部署中的MIMO和64QAM性能

2008 14th European Wireless Conference Pub Date : 2008-06-22 DOI: 10.1109/EW.2008.4623927

S. Tenorio, Yannick Le Pezennec, Manuel Sierra

引用次数: 6

SMDP approach for JRRM analysis in heterogeneous networks 异构网络中JRRM分析的SMDP方法

2008 14th European Wireless Conference Pub Date : 2008-06-22 DOI: 10.1109/EW.2008.4623856

M. Coupechoux, J. Kélif, P. Godlewski

引用次数: 15

Transmit beamforming with reduced channel information in MIMO-OFDM wireless systems MIMO-OFDM无线系统中减少信道信息的传输波束形成

2008 14th European Wireless Conference Pub Date : 2008-06-22 DOI: 10.1109/EW.2008.4623875

Seung-Hyeon Yang, J. Ko, Yong-Hwan Lee

引用次数: 0

Receiver architectures for OFDMA systems with subband carrier allocation 带有子带载波分配的OFDMA系统的接收机结构

2008 14th European Wireless Conference Pub Date : 2008-06-22 DOI: 10.1109/EW.2008.4623916

K. Maliatsos, A. Adamis, P. Constantinou

{"title":"Receiver architectures for OFDMA systems with subband carrier allocation","authors":"K. Maliatsos, A. Adamis, P. Constantinou","doi":"10.1109/EW.2008.4623916","DOIUrl":"https://doi.org/10.1109/EW.2008.4623916","url":null,"abstract":"OFDM systems are very sensitive in phase noise and frequency dispersion. Thus, time and frequency synchronization tasks are very crucial for the proper signal recovery in the receiver. The difficulties and challenges are multiplied if we consider a multiuser OFDM system (OFDMA) where the subcarriers are shared between different users. The receiver has the task to choose optimal sampling instants and to align the subcarrier frequencies of an OFDM symbol that contains signals from multiple users. In this study the use of filter banks is considered in order to reduce Intercarrier interference in such a system and simplify the synchronization procedures that must take place. The proposed schemes are applicable to adjacent subcarrier permutation OFDMA systems where users are separated in bands of adjacent subcarriers. In order to achieve low processing load, techniques of multirate signal processing are adopted. The DFT - polyphase filters are the basic elements of the processing chain. Moreover the filtering procedure is preferred to be divided in multiple stages. The computational workload for each structure is determined and some measures for the reduction of the computational burden are presented.","PeriodicalId":237850,"journal":{"name":"2008 14th European Wireless Conference","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116094381","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: 16

Low effort MIMO eetector for frequency selective indoor channels 用于频率选择室内信道的低功耗MIMO探测器

2008 14th European Wireless Conference Pub Date : 2008-06-22 DOI: 10.1109/EW.2008.4623853

M. Chouayakh, A. Knopp, Constant Ahokpossi, B. Lankl

引用次数: 3

Measurement based satellite to outdoor channel modeling for multiple satellite systems 基于测量的多卫星系统卫星到室外信道建模

2008 14th European Wireless Conference Pub Date : 2008-06-22 DOI: 10.1109/EW.2008.4623848

M. Milojević, M. Haardt, A. Heuberger

引用次数: 3

Efficient dual bias Q-Algorithm and optimum weights for EPC Class 1 Generation 2 Protocol EPC第1类第2代协议的有效对偶偏q算法及最优权值

2008 14th European Wireless Conference Pub Date : 2008-06-22 DOI: 10.1109/EW.2008.4623846

Dongwook Lee, Okkyeong Bang, Sooyeol Im, Hyuckjae Lee

引用次数: 19

Batch delivery in wireless sensor networks 无线传感器网络中的批量传输

2008 14th European Wireless Conference Pub Date : 2008-06-22 DOI: 10.1109/EW.2008.4623878

F. Naldi, A. Willig

引用次数: 0