发布求助
文献互助 智能选刊 最新文献

1st International Symposium onWireless Communication Systems, 2004.最新文献

筛选
英文 中文
A priority based call admission control protocol with call degradation for cellular networks 基于优先级的蜂窝网络呼叫接纳控制协议
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407211
M. Aboelaze, A. Elnaggar, Maan Musleh
{"title":"A priority based call admission control protocol with call degradation for cellular networks","authors":"M. Aboelaze, A. Elnaggar, Maan Musleh","doi":"10.1109/ISWCS.2004.1407211","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407211","url":null,"abstract":"Call admission control (CAC) protocols play a very important role in the performance of wireless networks. In this paper, we present a call admission control protocol for cellular wireless networks. Our protocol depends on degrading the existing calls by reducing the bandwidth allocated to them in order to admit \"important\" calls. Our protocol assign priorities for the incoming calls, and in the same time assign priorities to the existing calls, both admitted calls are admitted according to their priorities and the existing calls are degraded according to their priorities. We show simulation results for the relation between network utilization, call blocking probability, and average assigned bandwidth during the life of the call.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"137 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133610470","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
An efficient joint power control and beamforming algorithm for distributed base stations 一种高效的分布式基站联合功率控制和波束形成算法
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407224
C. Botella, G. Piñero, M. D. Diego, Alberto González, Ó. Lázaro
{"title":"An efficient joint power control and beamforming algorithm for distributed base stations","authors":"C. Botella, G. Piñero, M. D. Diego, Alberto González, Ó. Lázaro","doi":"10.1109/ISWCS.2004.1407224","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407224","url":null,"abstract":"Joint power control and optimal beamforming (JPCOB) algorithms have been proposed in the literature as promising solutions to increase the capacity of wireless multimedia networks. They also provides minimum total transmission power but achieving a certain quality of service (QoS) at each mobile. A new version of such a JPCOB technique was developed in a previous work, whose major innovation is the capacity of all the cell antennas to serve the mobiles cooperatively. For doing that, a new topology of the cell where the antennas are grouped in arrays and distributed around the coverage area is proposed. We denote these arrays as bases stations (BS), and the whole structure as multinode B. In this paper, we present a wide comparison between this new topology and the conventional one (sectorized node B placed in the center of the cell). Realistic scenarios have been simulated and from the results some interesting conclusions are given: for 3 BS's both topologies exhibits similar behavior, whereas for 2 BS's multinode B outperforms centered node B.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133981728","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: 3
BER of PSAM 16-QAM with channel estimation error and MRC diversity 考虑信道估计误差和MRC分集的psam16 - qam误码率
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407215
Lingzhi Cao, N. Beaulieu
{"title":"BER of PSAM 16-QAM with channel estimation error and MRC diversity","authors":"Lingzhi Cao, N. Beaulieu","doi":"10.1109/ISWCS.2004.1407215","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407215","url":null,"abstract":"M-ary quadrature amplitude modulation (M-QAM) achieves high spectral efficiency in additive white Gaussian noise (AWGN) and fading channels. In practical wireless systems, the signal fading can severely degrade the receiver performance if the accurate channel amplitude and phase information is not available to the receiver. The bit error rate (BER) performance of maximal ratio combining (MRC) M-QAM with pilot symbol assisted modulation (PSAM) channel estimation in static and Rayleigh fading channels is derived. The effects of noise and estimator decorrelation on the received BER are examined. The high sensitivity of diversity systems to channel estimation error is investigated and quantified.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130224115","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
Expedited forwarding for WiFi WiFi加速转发
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407259
F. Harivelo, G. L. Grand, Pascal Anelli, J. Wolf, B. Wolfinger
{"title":"Expedited forwarding for WiFi","authors":"F. Harivelo, G. L. Grand, Pascal Anelli, J. Wolf, B. Wolfinger","doi":"10.1109/ISWCS.2004.1407259","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407259","url":null,"abstract":"It is essential to reserve resources in order to provide an acceptable quality of service in networks with real-time communication requirements. However, such reserved resources, e.g. bandwidth, may be unused as a consequence of the variations in the actual resource demands. Since bandwidth is scarce in wireless LANs (WLANs), QoS provisioning may be very expensive. Therefore, we propose a new resource management approach leading to a more efficient usage of the network in which communicating stations or end-users dynamically hand over some of the free resources temporarily to the other communication neighbors. This paper concentrates on two fundamental problems of such a demand-based sharing of resources: the current estimation of resource utilization, and the algorithm to share and redistribute resources with real-time requirements. This approach for resource and traffic management allows one to achieve significantly better utilization of network resources.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128763607","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: 3
Improving the frequency characteristics of the electronically steerable passive array radiator antenna 改进电子操纵无源阵列辐射天线的频率特性
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407223
Michael J. Carras, A. Kalis, A. Constantinides
{"title":"Improving the frequency characteristics of the electronically steerable passive array radiator antenna","authors":"Michael J. Carras, A. Kalis, A. Constantinides","doi":"10.1109/ISWCS.2004.1407223","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407223","url":null,"abstract":"Electronically steerable passive array radiator (ESPAR) antennas have been shown to be a significant adjunct to wireless ad-hoc networks. One of their limitations however is their restricted bandwidth of operation due chiefly to the fact that the port impedance of the antenna changes in accordance with the configuration of the reactances employed to load the parasitic elements. We propose a technique to optimise the loading patterns used by adding an extra degree of freedom in the form of variable impedance at the central antenna element and thereby providing the ability to perform dynamic matching of the port impedance. This improves the frequency characteristics of the ESPAR antenna so that it may be used in different types of communication systems as a result of having wider bandwidth performance while retaining good beamforming characteristics.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127949342","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: 13
An iterative frequency-domain decision feedback receiver for CDMA systems 一种用于CDMA系统的迭代频域决策反馈接收机
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407198
Paulo Silva, R. Dinis
{"title":"An iterative frequency-domain decision feedback receiver for CDMA systems","authors":"Paulo Silva, R. Dinis","doi":"10.1109/ISWCS.2004.1407198","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407198","url":null,"abstract":"Unless high-complexity receiver structures are employed, conventional DS-CDMA (direct sequence code division multiple access) schemes can have a poor performance in severe time-dispersive channels, since the orthogonality between the users is lost. In this paper, we propose an iterative frequency-domain decision feedback equalizer for the downlink transmission within DS-CDMA systems employing block-transmission techniques, with an appropriate cyclic extension appended to each block. Our performance results show that the proposed receiver structure has excellent performance, close to the single-user MFB (matched filter bound), even for severe time-dispersive scenarios and/or in the presence of strong interfering channels.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126340819","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
Throughput and coverage of WLANs employing STBC under different channel conditions 采用STBC的无线局域网在不同信道条件下的吞吐量和覆盖
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407271
A. Doufexi, E. Tameh, A. Nix, A. Pal, M. Beach, C. Williams
{"title":"Throughput and coverage of WLANs employing STBC under different channel conditions","authors":"A. Doufexi, E. Tameh, A. Nix, A. Pal, M. Beach, C. Williams","doi":"10.1109/ISWCS.2004.1407271","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407271","url":null,"abstract":"HIPERLAN/2 and 802.11a/g WLANs employ coded orthogonal frequency division multiplexing (COFDM) to provide data rates of up to 54 Mbps in a 20 MHz bandwidth. In this paper, space-time block coding (STBC) techniques are considered as a means of enhancing the performance of COFDM WLANs. Packet error rate (PER) and throughput performance results are presented under different channel conditions. A WLAN physical layer simulator employing STBC and a propagation modelling tool are combined in order to evaluate the coverage and throughput of hot spot WLANs employing STBC for the 2/spl times/2 and 4/spl times/4 MIMO cases. Results showed that STBC can provide good performance, even at high K factors and under correlated channels. Throughput is significantly enhanced throughout the environment when STBC are employed.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121662439","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
A reinforcement learning approach for path discovery in MANETs with path caching strategy 基于路径缓存策略的多路径网络路径发现的强化学习方法
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407241
W. Usaha
{"title":"A reinforcement learning approach for path discovery in MANETs with path caching strategy","authors":"W. Usaha","doi":"10.1109/ISWCS.2004.1407241","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407241","url":null,"abstract":"In this paper, we enhance an existing path discovery scheme called the ticket-based probing (TBP) which supports QoS routing in mobile ad hoc networks (MANETs) to increase its accumulated reward. The scenario of QoS routing in MANETs with the presence of network information uncertainty is considered and modelled as a partially observable Markov decision process (POMDP). The proposed scheme integrates the original TBP scheme with a reinforcement learning method for POMDPs, called the on-policy first-visit Monte Carlo (ONMC) method, and a suitable path caching strategy. Simulation results shows that the inclusion of patch caching with the ONMC method can indeed achieve message overhead reduction with marginal difference in the path search ability and additional computational and storage requirements.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122777129","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
Utility-based adaptivity and partial resource reservation in wireless/mobile multimedia networks 无线/移动多媒体网络中基于效用的自适应和部分资源保留
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407232
F. Rango, P. Fazio, S. Marano
{"title":"Utility-based adaptivity and partial resource reservation in wireless/mobile multimedia networks","authors":"F. Rango, P. Fazio, S. Marano","doi":"10.1109/ISWCS.2004.1407232","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407232","url":null,"abstract":"Recently there is a growing interest in the adaptive multimedia networking where the bandwidth of an ongoing multimedia flow can be dynamically adjusted. In this paper, the attention is focused on the management of independent and dependent from mobility services. Two classes of services have been considered: MIP and MDP classes defined in the integrated services for mobile wireless environment. These two classes have been managed in a wireless adaptive networks. A utility-based rate adaptation algorithm has been considered and an admission control has been proposed. Rate adaptation and admission control consider the channel conditions through a slow fading channel model for wireless LAN 802.11b. The admission control can use the pre-reservation phase among the cells potentially visited from the mobile hosts for MIP services and consider the bandwidth availability only on the current cells for MDP services. A new way for estimating the cells visited by MIP services has been proposed and analyzed. The performance evaluations of the wireless system have been evaluated in terms of total bandwidth utilization for MIP and MDP services, average bandwidth assigned to mobile users, system outage probability and admitted flows.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126779884","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
A joint channel and channel length estimation algorithm for MIMO-OFDM 一种MIMO-OFDM联合信道和信道长度估计算法
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407254
J. Siew, J. Coon, A. Nix, Michael Beach, S. Armour, J. McGeehan
{"title":"A joint channel and channel length estimation algorithm for MIMO-OFDM","authors":"J. Siew, J. Coon, A. Nix, Michael Beach, S. Armour, J. McGeehan","doi":"10.1109/ISWCS.2004.1407254","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407254","url":null,"abstract":"The recent interest in coherently detected MIMO-OFDM systems has fueled research efforts on various channel estimation methods. Few, however, have addressed the practical problem of estimating the instantaneous channel length. This necessary but often overlooked component of channel estimation is crucial to accurate channel estimates in many OFDM channel estimation techniques. In this paper we propose a method for jointly estimating the channel and instantaneous channel length. We describe the algorithm in detail, provide a mathematical framework, and show simulated results, both in terms of the estimation accuracy and the impact it has on a system's packet error rate (PER) performance.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114773529","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: 3
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信