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A Tapered Monopole Antenna with Band Notch Function for Ultra-Wideband Communication 一种用于超宽带通信的带陷波的锥形单极天线
The 2nd International Conference on Wireless Broadband and Ultra Wideband Communications (AusWireless 2007) Pub Date : 2007-08-27 DOI: 10.1109/AUSWIRELESS.2007.17
Yi-Chieh Lee, Jwo-Shiun Sun
{"title":"A Tapered Monopole Antenna with Band Notch Function for Ultra-Wideband Communication","authors":"Yi-Chieh Lee, Jwo-Shiun Sun","doi":"10.1109/AUSWIRELESS.2007.17","DOIUrl":"https://doi.org/10.1109/AUSWIRELESS.2007.17","url":null,"abstract":"A tapered monopole antenna that has a frequency band notch function is proposed. The antenna includes a semicircle shaped patch, two semicircle ground planes and a CPW-fed excitation to cover the ultra- wideband frequency operation (3.1 GHz ~ 10.6 GHz). By modifying the U-shaped slot, the frequency band notch within the operating bandwidth can be easily changed. The measured results show a return loss bandwidth of 12.3 GHz (2.7 GHz ~ 15 GHz), omnidirectional radiation patterns and reasonable gain over the UWB operating bandwidth.","PeriodicalId":312921,"journal":{"name":"The 2nd International Conference on Wireless Broadband and Ultra Wideband Communications (AusWireless 2007)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115197956","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
Improving FAST TCP Performance in Asymmetric Networks 提高非对称网络中FAST TCP的性能
The 2nd International Conference on Wireless Broadband and Ultra Wideband Communications (AusWireless 2007) Pub Date : 2007-08-27 DOI: 10.1109/AUSWIRELESS.2007.39
Fei Ge, L. Tan
{"title":"Improving FAST TCP Performance in Asymmetric Networks","authors":"Fei Ge, L. Tan","doi":"10.1109/AUSWIRELESS.2007.39","DOIUrl":"https://doi.org/10.1109/AUSWIRELESS.2007.39","url":null,"abstract":"FAST TCP is a new promising TCP protocol developed for high-speed long-latency networks. This paper reveals that, within the FAST TCP protocol, the forward flow suffers performance degradation in asymmetric networks with bi-directional flows. We disclose the reason for the performance degradation, i.e., the queue delay measured by forward flow in one-way path is severely influenced by backward flow. A novel method is proposed to ameliorate this situation by using TCP time stamp option. Simulation results demonstrate significant performance improvement of forward flow.","PeriodicalId":312921,"journal":{"name":"The 2nd International Conference on Wireless Broadband and Ultra Wideband Communications (AusWireless 2007)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127112437","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
A 60GHz transmitter in 0.18mu m Silicon Germanium 60GHz发射机，0.18 μ m硅锗
The 2nd International Conference on Wireless Broadband and Ultra Wideband Communications (AusWireless 2007) Pub Date : 2007-08-27 DOI: 10.1109/AUSWIRELESS.2007.4
M. Boers, A. Parker, N. Weste
{"title":"A 60GHz transmitter in 0.18mu m Silicon Germanium","authors":"M. Boers, A. Parker, N. Weste","doi":"10.1109/AUSWIRELESS.2007.4","DOIUrl":"https://doi.org/10.1109/AUSWIRELESS.2007.4","url":null,"abstract":"Simulated results for a silicon germanium transmitter operating at 60 GHz are presented. The super-heterodyne transmitter is based on a moving IF architecture with two up-conversion stages. The transmitter includes a baseband to 12 GHz image- reject mixer, a 12 to 60 GHz Gilbert-cell mixer, a passive balun and a power amplifier capable of greater than 13 dBm saturated output power. All bias voltages are tuneable using a 3-wire serial interface connected to 4-bit DAC's. Also on-chip is a frequency synthesizer that supplies the LO to both mixers and locks the on-chip 24 GHz VCO to an external source.","PeriodicalId":312921,"journal":{"name":"The 2nd International Conference on Wireless Broadband and Ultra Wideband Communications (AusWireless 2007)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129882697","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
Robust Integer Frequency Offset Estimation for OFDM System OFDM系统的鲁棒整数频偏估计
The 2nd International Conference on Wireless Broadband and Ultra Wideband Communications (AusWireless 2007) Pub Date : 2007-08-27 DOI: 10.1109/AUSWIRELESS.2007.68
Eu-Suk Shim, Hyoung-Kyu Song, Y. You, Byoung-Heon Lee, J. Yi
{"title":"Robust Integer Frequency Offset Estimation for OFDM System","authors":"Eu-Suk Shim, Hyoung-Kyu Song, Y. You, Byoung-Heon Lee, J. Yi","doi":"10.1109/AUSWIRELESS.2007.68","DOIUrl":"https://doi.org/10.1109/AUSWIRELESS.2007.68","url":null,"abstract":"Orthogonal frequency division multiplexing (OFDM) systems are highly sensitive to carrier frequency offset and symbol timing error. This paper deals with estimation method of integer frequency offset (IFO) without the aid of pilot symbols. The proposed IFO estimator exploits two consecutive identical OFDM data symbols with only change of phase. To demonstrate the efficiency of the proposed IFO estimators, comparisons are made with other existing estimators in terms of error performance, estimation range, and complexity.","PeriodicalId":312921,"journal":{"name":"The 2nd International Conference on Wireless Broadband and Ultra Wideband Communications (AusWireless 2007)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130199872","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
Adaptation of Angle-of-Arrival Estimation in Mobile Communications Using Geometrically Based Channel Models 基于几何信道模型的移动通信自适应到达角估计
The 2nd International Conference on Wireless Broadband and Ultra Wideband Communications (AusWireless 2007) Pub Date : 2007-08-27 DOI: 10.1109/AUSWIRELESS.2007.21
S. Mostafa, S. Elramly, M. Ragheb
{"title":"Adaptation of Angle-of-Arrival Estimation in Mobile Communications Using Geometrically Based Channel Models","authors":"S. Mostafa, S. Elramly, M. Ragheb","doi":"10.1109/AUSWIRELESS.2007.21","DOIUrl":"https://doi.org/10.1109/AUSWIRELESS.2007.21","url":null,"abstract":"Channel modeling is considered a way of simulating and studying RF channels. A channel model can perform the function of producing the channel output parameters, such as multipath delays, and signal direction of arrival. Geometrically based channel models are introduced by defining a propagation environment with a specific geometrical layout. This work focuses on geometrically based single bounce elliptical model, GBSBEM and geometrically based single bounce circular model, GBSBCM because of their ability to produce spatial channel characteristics that are tied to the physical propagation environment. Simulations that represent and implement the geometry of the channel for both models are designed and analyzed using Matlab software. A thorough study of the channel output parameters AOA, TOA, and joint AOA-TOA probability density functions is carried out. The impact of the geometric channel parameters on adaptation of AOA estimation is illustrated..","PeriodicalId":312921,"journal":{"name":"The 2nd International Conference on Wireless Broadband and Ultra Wideband Communications (AusWireless 2007)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127908789","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: 2
Service Criticality Based Scheduling for IEEE 802.16 WirelessMAN 基于业务临界度的IEEE 802.16无线城域网调度
The 2nd International Conference on Wireless Broadband and Ultra Wideband Communications (AusWireless 2007) Pub Date : 2007-08-27 DOI: 10.1109/AUSWIRELESS.2007.72
A. Shejwal, A. Parhar
{"title":"Service Criticality Based Scheduling for IEEE 802.16 WirelessMAN","authors":"A. Shejwal, A. Parhar","doi":"10.1109/AUSWIRELESS.2007.72","DOIUrl":"https://doi.org/10.1109/AUSWIRELESS.2007.72","url":null,"abstract":"IEEE 802.16 WirelessMAN (WiMax) has emerged as broadband wireless access (BWA) solution for fixed and mobile communication requirements in the metro area. While the 802.16 standard throws adequate light on aspects of bandwidth-request and subsequent grants as well as supported service types, it however does not discuss service scheduling. In this paper, we propose a new scheduling algorithm, referred as service criticality (SC) based scheduling scheme. The SC scheme offers fairness, efficiency and low-latency scheduling and facilitates QoS guarantees. SC is based on a dual of buffer occupancies at nodes and allowable latencies for a particular service. We compare SC scheme with round-robin and max-min fair scheduling schemes under different system loads. We observe that while round robin and max-min scheme does not guarantee QoS support at high loads, the SC scheme facilitates efficient scheduling even at heavy loads. Simulation based study is reported that considers a multitude of services using realistic physical and MAC layer models. Delay and blocking results are investigated. The SC concept shows betterment over conventional max-min scheme as well as round robin.","PeriodicalId":312921,"journal":{"name":"The 2nd International Conference on Wireless Broadband and Ultra Wideband Communications (AusWireless 2007)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127913209","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: 9
A 500-700 GHz system for exploring the THz frequency regime 一个500-700千兆赫的系统，用于探测太赫兹频率
The 2nd International Conference on Wireless Broadband and Ultra Wideband Communications (AusWireless 2007) Pub Date : 2007-08-27 DOI: 10.1109/AUSWIRELESS.2007.2
A. Hellicar, Li Li, K. Greene, G. Hislop, S. Hanham, N. Nikolic, Jia Du
{"title":"A 500-700 GHz system for exploring the THz frequency regime","authors":"A. Hellicar, Li Li, K. Greene, G. Hislop, S. Hanham, N. Nikolic, Jia Du","doi":"10.1109/AUSWIRELESS.2007.2","DOIUrl":"https://doi.org/10.1109/AUSWIRELESS.2007.2","url":null,"abstract":"The CSIRO ICT Centre has recently completed a terahertz demonstrator with the aim of exploring applications in the 500-700 GHz range. The system is capable of transmission measurements through samples, and simple modulation experiments. Further work towards realizing detection by arrays of superconducting detectors is being pursued. This paper describes the design choices and implementation of the terahertz system, discusses recent results and future directions.","PeriodicalId":312921,"journal":{"name":"The 2nd International Conference on Wireless Broadband and Ultra Wideband Communications (AusWireless 2007)","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131209289","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
Vertical Handoff Decision Algorithm for UMTS-WLAN UMTS-WLAN垂直切换决策算法
The 2nd International Conference on Wireless Broadband and Ultra Wideband Communications (AusWireless 2007) Pub Date : 2007-08-27 DOI: 10.1109/AUSWIRELESS.2007.87
Y. Nkansah-Gyekye, J. Agbinya
{"title":"Vertical Handoff Decision Algorithm for UMTS-WLAN","authors":"Y. Nkansah-Gyekye, J. Agbinya","doi":"10.1109/AUSWIRELESS.2007.87","DOIUrl":"https://doi.org/10.1109/AUSWIRELESS.2007.87","url":null,"abstract":"The next generation of mobile/wireless communication systems is expected to include heterogeneous broadband wireless networks that will coexist and use a common IP core to offer a diverse range of high data rate multimedia services to end users with contemporary mobile devices that are equipped with multiple network interfaces since the networks have characteristics that complement each other. This requires the provision of seamless vertical handoff. This paper provides components of an adaptive multiple attribute vertical handoff decision algorithm that enables access network selection at a mobile node. A performance study using the integration of wireless wide area networks (WWANs) and wireless local area networks (WLANs) as an example shows that our proposed vertical handoff decision algorithm is able to determine when a handoff is required, and selects the best access network that is optimized to network conditions, quality of service requirements, user preferences, and service cost.","PeriodicalId":312921,"journal":{"name":"The 2nd International Conference on Wireless Broadband and Ultra Wideband Communications (AusWireless 2007)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131936444","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: 66
UWB Multipath Simulator based on TEM Horn Antenna 基于TEM喇叭天线的超宽带多径模拟器
The 2nd International Conference on Wireless Broadband and Ultra Wideband Communications (AusWireless 2007) Pub Date : 2007-08-27 DOI: 10.1109/AUSWIRELESS.2007.85
A. Muqaibel, U. Johar
{"title":"UWB Multipath Simulator based on TEM Horn Antenna","authors":"A. Muqaibel, U. Johar","doi":"10.1109/AUSWIRELESS.2007.85","DOIUrl":"https://doi.org/10.1109/AUSWIRELESS.2007.85","url":null,"abstract":"Most of the existing UWB models are extensions of narrowband models. These models suffer from limitations because UWB multipath propagation is frequency and antenna dependent. In this paper, a directional simulator based on TEM horn antenna is developed. This simulator illustrates the spatial impact on the received multipath profiles. Several deterministic scenarios are simulated to examine the antenna impact on receiver design and positioning accuracy.","PeriodicalId":312921,"journal":{"name":"The 2nd International Conference on Wireless Broadband and Ultra Wideband Communications (AusWireless 2007)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134187682","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: 5
Mitigating Flooding Attacks in Mobile Ad-hoc Networks Supporting Anonymous Communications 缓解支持匿名通信的移动自组织网络中的泛洪攻击
The 2nd International Conference on Wireless Broadband and Ultra Wideband Communications (AusWireless 2007) Pub Date : 2007-08-27 DOI: 10.1109/AUSWIRELESS.2007.46
V. Balakrishnan, V. Varadharajan, U. Tupakula, M. Moe
{"title":"Mitigating Flooding Attacks in Mobile Ad-hoc Networks Supporting Anonymous Communications","authors":"V. Balakrishnan, V. Varadharajan, U. Tupakula, M. Moe","doi":"10.1109/AUSWIRELESS.2007.46","DOIUrl":"https://doi.org/10.1109/AUSWIRELESS.2007.46","url":null,"abstract":"Recently several techniques that provide different degree of anonymity have been proposed for wired and wireless communication. Although, the recently proposed techniques are successful in achieving high degree of anonymity, there are some disadvantages associated with the proposed techniques. In this paper we analyze the flooding and packet drop attacks in mobile ad hoc networks that support anonymous communication. Then we propose a novel technique to deal with the flooding attacks. Our approach can efficiently identify and isolate the malicious node that floods the network. In addition, our technique provides a mechanism to identify the benign behavior of an expelled node and rejoins the expelled node back into the network. Furthermore, our approach does not require any additional packets to communicate the behavior of the flooding node and hence does not incur any additional overhead. Finally we validate the performance analysis of our technique through NS2 simulations.","PeriodicalId":312921,"journal":{"name":"The 2nd International Conference on Wireless Broadband and Ultra Wideband Communications (AusWireless 2007)","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128723325","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: 31
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