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2007 Wireless Telecommunications Symposium最新文献

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Wireless internet competition: Municipal wireless vs. 3G mobile service 无线互联网竞争:市政无线与3G移动服务
2007 Wireless Telecommunications Symposium Pub Date : 2007-04-26 DOI: 10.1109/WTS.2007.4563309
J. Shim, Seungjae Shin, M. Weiss
{"title":"Wireless internet competition: Municipal wireless vs. 3G mobile service","authors":"J. Shim, Seungjae Shin, M. Weiss","doi":"10.1109/WTS.2007.4563309","DOIUrl":"https://doi.org/10.1109/WTS.2007.4563309","url":null,"abstract":"With an emphasis on creating ubiquitous Internet access to bridge the digital gap between location and access speed, the refinement of wireless technologies has it so that cities can reap the socio-economic benefits of the Internet. The 3r generation (3G) and wireless fidelity (WiFi) are the two main wireless technologies which access Internet using wireless devices. Some major cities in the U.S. have either deployed or have future plans to roll-out city-wide broadband wireless network using WiFi technology. Even if 3G and WiFi have different origins and features, they will become competing wireless Internet access services in the near future. In this paper, using a game theory, the authors build a competition model of 3G and WiFi and demonstrate which technology will have a better market position and what an optimal pricing strategy is through equilibrium analysis. The authors found that in the equilibrium analysis, WiFi could have a better market position in the future. On the other hand, by using a higher pricing strategy, the profit of 3G providers would be higher than that of WiFi providers. Finally, the municipal WiFi could be useful as a public Internet access method and prove to be competitive in this market with its attractive low pricing.","PeriodicalId":296096,"journal":{"name":"2007 Wireless Telecommunications Symposium","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130200503","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
Local fast re-authentication protocol for 3G-WLAN interworking architecture 3G-WLAN互联架构的本地快速重认证协议
2007 Wireless Telecommunications Symposium Pub Date : 2007-04-26 DOI: 10.1109/WTS.2007.4563332
Ali Al Shidhani, Victor C. M. Leung
{"title":"Local fast re-authentication protocol for 3G-WLAN interworking architecture","authors":"Ali Al Shidhani, Victor C. M. Leung","doi":"10.1109/WTS.2007.4563332","DOIUrl":"https://doi.org/10.1109/WTS.2007.4563332","url":null,"abstract":"Many advantages are attained by integrating 3G and WLAN systems to form a 3G-WLAN interworking architecture. However, securing the architecture is a great challenge because of the number of vulnerabilities introduced. EAP-AKA is the authentication solution adopted by the 3GPP to secure accesses to 3G-WLAN architectures. Two types of EAP-AKA authentication are available, full authentication and fast re-authentication. This paper presents a localized fast re-authentication protocol to substitute the standard fast re-authentication protocol. The proposed protocol achieves faster re- authentication by locally performing the authentication procedure. A new keying framework is introduced to minimize authentication delays during re-authentication and handover operations.","PeriodicalId":296096,"journal":{"name":"2007 Wireless Telecommunications Symposium","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131508970","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: 18
Performance evaluation of EVRC-encoded voice traffic over CDMA EVDO Rev. A 基于CDMA EVDO的evrc编码话务流性能评价
2007 Wireless Telecommunications Symposium Pub Date : 2007-04-26 DOI: 10.1109/WTS.2007.4563340
Fulu Li, I. Vukovic, A. Lippman
{"title":"Performance evaluation of EVRC-encoded voice traffic over CDMA EVDO Rev. A","authors":"Fulu Li, I. Vukovic, A. Lippman","doi":"10.1109/WTS.2007.4563340","DOIUrl":"https://doi.org/10.1109/WTS.2007.4563340","url":null,"abstract":"Voice traffic is not efficiently supported by CDMA EVDO Rev. A from its original design, but an efficient approach is needed to support voice traffic over CDMA EVDO Rev. A for graceful migration from CDMA2000 1x to CDMA EVDO Rev. A as voice service revenue is still the dominant income source for cellular service providers. To understand the system design tradeoffs, we first investigate the traffic characteristics of EVRC-encoded real voice traces and we find that the correlation structure of voice traffic exhibits strong long-range dependence. We further observe that the burst length distribution of voice traffic is heavy-tailed. Traditional Markov-model could not accurately characterize the true nature of the voice traffic. In the major part of our study, we examine the tradeoff between the initial play out delay and voice quality for real voice traces over CDMA EVDO Rev. A. We also examine the tradeoff between voice quality and RF conditions, e.g., the location of mobiles and the number of mobiles in a sector, etc. Finally, we address the performance aspects of voice traffic over CDMA EVDO Rev. A with adaptive frame bundling (AFB) techniques.","PeriodicalId":296096,"journal":{"name":"2007 Wireless Telecommunications Symposium","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131346765","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: 1
Maximum-likelihood carrier-frequency synchronization and channel estimation for MIMO-OFDM systems MIMO-OFDM系统的最大似然载波频率同步与信道估计
2007 Wireless Telecommunications Symposium Pub Date : 2007-04-26 DOI: 10.1109/WTS.2007.4563307
S. Salari, M. Ahmadian, M. Ardebilipour, V. Meghdadi, J. Cances
{"title":"Maximum-likelihood carrier-frequency synchronization and channel estimation for MIMO-OFDM systems","authors":"S. Salari, M. Ahmadian, M. Ardebilipour, V. Meghdadi, J. Cances","doi":"10.1109/WTS.2007.4563307","DOIUrl":"https://doi.org/10.1109/WTS.2007.4563307","url":null,"abstract":"In this paper, we propose a new scheme for maximum-likelihood (ML) estimation of both carrier- frequency offset (CFO) and channel coefficients in multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. To reduce the prohibitive complexity of ML estimate, the expectation-maximization (EM) algorithm is employed. From Simulations, it is shown that the accuracy of proposed scheme is close to the Cramer-Rao bound (CRB) for both CFO and channel estimations.","PeriodicalId":296096,"journal":{"name":"2007 Wireless Telecommunications Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130718551","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
Delay effect on conversational quality in telecommunication networks: Do we mind? 延迟效应对通信网络会话质量的影响:我们介意吗?
2007 Wireless Telecommunications Symposium Pub Date : 2007-04-26 DOI: 10.1109/WTS.2007.4563311
J. Holub, M. Kastner, Ondrej Tomiska
{"title":"Delay effect on conversational quality in telecommunication networks: Do we mind?","authors":"J. Holub, M. Kastner, Ondrej Tomiska","doi":"10.1109/WTS.2007.4563311","DOIUrl":"https://doi.org/10.1109/WTS.2007.4563311","url":null,"abstract":"Transmission delays are unwanted effects of every day telecommunication systems. These effects influence the overall quality of a telephony connection as perceived by end users. This article summarizes known subjective experiments testing the influence of delays on the perceived quality. In order to find a possible explanation for the differences in the results of those experiments a new conversational test was conducted. The new subjective tests are also presented and compared to already existing experiment results.","PeriodicalId":296096,"journal":{"name":"2007 Wireless Telecommunications Symposium","volume":"300 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114580087","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: 14
Finite wordlength design for FFT/IFFT in UWB-OFDM systems UWB-OFDM系统中FFT/IFFT的有限字长设计
2007 Wireless Telecommunications Symposium Pub Date : 2007-04-26 DOI: 10.1109/WTS.2007.4563300
A. Ghassemi, T. Gulliver
{"title":"Finite wordlength design for FFT/IFFT in UWB-OFDM systems","authors":"A. Ghassemi, T. Gulliver","doi":"10.1109/WTS.2007.4563300","DOIUrl":"https://doi.org/10.1109/WTS.2007.4563300","url":null,"abstract":"Orthogonal frequency division multiplexing (OFDM) has been proposed for use in ultra-wideband (UWB) communication systems. In a UWB-OFDM transceiver, resource efficient FFT/IFFT hardware is a necessity due to minimal silicon area and low power requirements. Resource requirements can be reduced by using finite precision arithmetic in the FFT/IFFT algorithms. However, this introduces round-off and overflow noise, resulting in a degradation in BER performance. To address this problem, the finite precision arithmetic and wordlengths should be optimally designed at every stage of the FFT/IFFT. In this paper, we first present a mixed-radix FFT/IFFT algorithm for a UWB-OFDM transceiver with low multiplicative complexity. A round-off noise propagation model is derived and used to determine the optimal wordlength of the outputs and twiddle factors at each stage. The performance of the resulting system is compared to that with infinite precision arithmetic.","PeriodicalId":296096,"journal":{"name":"2007 Wireless Telecommunications Symposium","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122064168","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: 1
Consumed-energy-type-aware routing for wireless sensor networks 无线传感器网络的能耗类型感知路由
2007 Wireless Telecommunications Symposium Pub Date : 2007-04-26 DOI: 10.1109/WTS.2007.4563317
S. Ito, K. Yoshigoe
{"title":"Consumed-energy-type-aware routing for wireless sensor networks","authors":"S. Ito, K. Yoshigoe","doi":"10.1109/WTS.2007.4563317","DOIUrl":"https://doi.org/10.1109/WTS.2007.4563317","url":null,"abstract":"This study proposes and investigates consumed- energy-type-aware routing (CETAR), a new metric to preserve the energy of active source nodes in the WSNs. CETAR uses statistics of the energy consumed for each type of node activities to select a node which seldom plays a role of source node as a routing node. By preserving the energy of active source nodes, CETAR can prolong the life-span of target specific operations in the WSN in which targets are not precisely known at the deployment of the network. Simulation model shows that the geographical and energy aware routing (GEAR) with CETAR can send significantly more packets than GEAR without CETAR for both uniform and non-uniform traffic regardless of network size. Most importantly, the new metric proposed in this paper can be widely deployed to existing energy aware routing protocols.","PeriodicalId":296096,"journal":{"name":"2007 Wireless Telecommunications Symposium","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123571648","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
Adaptive virtual queue random early detection in satellite networks 卫星网络中自适应虚拟队列随机早期检测
2007 Wireless Telecommunications Symposium Pub Date : 2007-04-26 DOI: 10.1109/WTS.2007.4563336
Dojun Byun, J. Baras
{"title":"Adaptive virtual queue random early detection in satellite networks","authors":"Dojun Byun, J. Baras","doi":"10.1109/WTS.2007.4563336","DOIUrl":"https://doi.org/10.1109/WTS.2007.4563336","url":null,"abstract":"Due to exponential increases in internet traffic, Active Queue Management (AQM) has been heavily studied by numerous researchers. However, little is known about AQM in satellite networks. A microscopic examination on queueing behavior in satellite networks is conducted to identify problems with applying existing AQM methods. A new AQM method is proposed to overcome the problems and it is validated with a realistic emulation environment.","PeriodicalId":296096,"journal":{"name":"2007 Wireless Telecommunications Symposium","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125836212","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
Rate identification in multirate CDMA 多速率CDMA中的速率识别
2007 Wireless Telecommunications Symposium Pub Date : 2007-04-26 DOI: 10.1109/WTS.2007.4563298
K. Kala, S. Nagaraj
{"title":"Rate identification in multirate CDMA","authors":"K. Kala, S. Nagaraj","doi":"10.1109/WTS.2007.4563298","DOIUrl":"https://doi.org/10.1109/WTS.2007.4563298","url":null,"abstract":"Code division multiple access (CDMA) is a multiplexing technique that spreads the spectrum of user data so that it occupies a bandwidth much greater than that is necessary to send the information. CDMA systems have been highly successful due to the huge increase in capacity offered compared to other technologies. An effective technique to further increase the capacity of time-varying wireless channels is the employment of adaptive rate transmissions. Here, the transmission rate, bandwidth and power can be adaptively adjusted depending upon the instantaneous channel conditions. In this project, we analyzed the rate identification technique in such multirate systems. We saw how the concept of using the same PN sequence can significantly simplify the system.","PeriodicalId":296096,"journal":{"name":"2007 Wireless Telecommunications Symposium","volume":"210 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126862620","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
Mobility diversifies Trust: Introducing TrustRings 移动性使信任多样化:引入trustring
2007 Wireless Telecommunications Symposium Pub Date : 2007-04-01 DOI: 10.1109/WTS.2007.4563326
D. Spiewak, Volker Fusenig, T. Engel
{"title":"Mobility diversifies Trust: Introducing TrustRings","authors":"D. Spiewak, Volker Fusenig, T. Engel","doi":"10.1109/WTS.2007.4563326","DOIUrl":"https://doi.org/10.1109/WTS.2007.4563326","url":null,"abstract":"Summary form only given. In this paper, we focus on trust establishment in mobile wireless networks and introduce the idea of TrustRings. The concept of TrustRings facilitates the calculation of trust-values for nodes in mobiity networks based on an egocentric network model. Each node concentrates autonomously on the establishment of its own TrustRings by placing itself as the centric node in the middle of the network. Then, it starts building 3-dimensional spheres using the multiple of its own transmission range as the radius of each sphere. The innermost sphere is generated by exactly the transmission range of each node. By further iterating this process, the second sphere is created by using the doubled transmission range and so on. Furthermore, each node maintains a trust-value-database to store the initial-trust-value of other network participants, which results from positive and negative experiences with network participants only within the node's direct transmission range. After a node has located its communication partner in a specific TrustRing, the initial-trust-value offers the foundation for calculating the node's trust-values within a specific TrustRing. The main advantage of the proposed model is that it takes the characteristics of mobile networks, such as uncertainty of reliable communication, into account and provides the opportunity to deploy a sophisticated trust model.","PeriodicalId":296096,"journal":{"name":"2007 Wireless Telecommunications Symposium","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133722112","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: 1
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