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Int. J. Wirel. Opt. Commun.最新文献

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Efficient ABC for the Frequency Dependent Alternating Direction-Implicit FDTD Method 频率相关交替方向隐式FDTD方法的高效ABC
Int. J. Wirel. Opt. Commun. Pub Date : 2007-05-01 DOI: 10.1142/S0219799507000588
A. Thiry, F. Costen, A. Brown
{"title":"Efficient ABC for the Frequency Dependent Alternating Direction-Implicit FDTD Method","authors":"A. Thiry, F. Costen, A. Brown","doi":"10.1142/S0219799507000588","DOIUrl":"https://doi.org/10.1142/S0219799507000588","url":null,"abstract":"Ultra WideBand (UWB) signals have a high potential for a wide range of applications. The Finite-Difference Time-Domain (FDTD) method is widely used in the development of UWB technology but has still two main limitations. One is that material parameters are constant over the whole frequency range. Frequency dependent materials can be accommodated by adopting a Debye model. The other is that the minimum simulation time is bound by the Courant-Friedrichs-Lewy (CFL) condition, which can be solved by the application of the Alternating Direction-Implicit (ADI) scheme. The combination of Debye model and ADI scheme in FDTD results in the Frequency-Dependent (FD) ADI-FDTD method. This paper proposes an adaptation of the most effective Absorbing Boundary Condition (ABC), the Complex Frequency-Shift (CFS) Perfectly Matched Layer (PML), to FD-ADI-FDTD. The formulation of CFS-PML for FD-ADI-FDTD is proposed and its performance is assessed. The influence of the Courant Number (CFLN), the media parameters and the number of layers are investigated.","PeriodicalId":185917,"journal":{"name":"Int. J. Wirel. Opt. Commun.","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126041971","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
Compact Monopole excited Drum Shaped Antenna for Aws/DCS/PCS/ DECT/3G/UMTS/Bluetooth Applications 用于Aws/DCS/PCS/ DECT/3G/UMTS/蓝牙应用的紧凑单极激励鼓形天线
Int. J. Wirel. Opt. Commun. Pub Date : 2007-05-01 DOI: 10.1142/S0219799507000643
P. C. Bybi, Augustin Gijo, B. Jitha, B. Paul, C. Aanandan, K. Vasudevan, P. Mohanan
{"title":"Compact Monopole excited Drum Shaped Antenna for Aws/DCS/PCS/ DECT/3G/UMTS/Bluetooth Applications","authors":"P. C. Bybi, Augustin Gijo, B. Jitha, B. Paul, C. Aanandan, K. Vasudevan, P. Mohanan","doi":"10.1142/S0219799507000643","DOIUrl":"https://doi.org/10.1142/S0219799507000643","url":null,"abstract":"A compact monopole excited drum shaped antenna for broad band application is presented. The proposed antenna offers a 2:1 VSWR bandwidth greater than 50% (1690–2940 MHz). The wide bandwidth along with omni directional pattern and moderate gain makes it suitable for existing and future wireless applications. Details of the antenna design and a comparison of simulated and measured results are presented and discussed.","PeriodicalId":185917,"journal":{"name":"Int. J. Wirel. Opt. Commun.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123004880","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 Low-Latency Fault-Tolerant Protocol for Mobile IP in Wireless Systems 无线系统中移动IP的低延迟容错协议
Int. J. Wirel. Opt. Commun. Pub Date : 2007-05-01 DOI: 10.1142/S021979950700062X
Valance Phua, A. Datta
{"title":"A Low-Latency Fault-Tolerant Protocol for Mobile IP in Wireless Systems","authors":"Valance Phua, A. Datta","doi":"10.1142/S021979950700062X","DOIUrl":"https://doi.org/10.1142/S021979950700062X","url":null,"abstract":"In wireless systems, mobile IP provides mobile nodes with uninterrupted network connections to correspondent nodes through foreign and home agents. A failure in foreign agent causes the constant network connections of affected mobile nodes to be interrupted, hence increasing latency in packet delivery. Existing proposals to tolerate foreign agent failures impose latency in packet delivery. Hence, we present a fault-tolerant protocol to reduce latency in packet delivery by allocating exactly one primary and one backup foreign agent in a distributed fashion for all mobile nodes in the wireless system prior to registration between mobile nodes and their home agents. When foreign agents fail, affected mobile nodes are not required to re-register with their home agents, thus lowering latency in packet delivery. Through simulation, our results show that the proposed protocol lowers latency in packet delivery by 3.7% to 6.0% for each mobile node as compared to a previously published protocol.","PeriodicalId":185917,"journal":{"name":"Int. J. Wirel. Opt. Commun.","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123393540","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 Low-Complexity Iterative Receiver for Multiuser Space-Time Block Coding Systems 一种多用户空时分组编码系统的低复杂度迭代接收机
Int. J. Wirel. Opt. Commun. Pub Date : 2006-10-18 DOI: 10.1142/S0219799507000606
Ha H. Nguyen, Yajun Yang
{"title":"A Low-Complexity Iterative Receiver for Multiuser Space-Time Block Coding Systems","authors":"Ha H. Nguyen, Yajun Yang","doi":"10.1142/S0219799507000606","DOIUrl":"https://doi.org/10.1142/S0219799507000606","url":null,"abstract":"In an iterative receiver of a bandwidth-efficient multiuser space-time block coding (STBC) system, the extrinsic information is iteratively exchanged among the soft-input soft-output (SISO) channel decoders, the soft-output multiuser detector and the soft-output M-ary demodulators. Error performance, complexity and efficiency of the extrinsic information exchange are the most important properties of an iterative receiver. Taking these factors into account, sigma mapping is first applied to M-QAM constellations to yield a low-complexity soft-output minimum mean squared error (MMSE) demodulator to be used in the iterative receiver. Then a low-complexity two-loop iterative receiver is proposed for the multiuser STBC systems. It is shown that by running an additional inner iteration (between the channel decoders and the M-ary demodulators) for every outer iteration (between the channel decoders and the multiuser detector), the proposed receiver is superior to the conventional one, in which only one inner iteration is executed per one outer iteration. The results in this paper are therefore useful for wireless applications that employ space-time coding and require a very high bandwidth efficiency.","PeriodicalId":185917,"journal":{"name":"Int. J. Wirel. Opt. Commun.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132688718","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 Novel Compact Shorted UWB Antenna 一种新型紧凑型短路超宽带天线
Int. J. Wirel. Opt. Commun. Pub Date : 2006-08-01 DOI: 10.1142/S021979950600048X
G. Ruvio, M. Ammann
{"title":"A Novel Compact Shorted UWB Antenna","authors":"G. Ruvio, M. Ammann","doi":"10.1142/S021979950600048X","DOIUrl":"https://doi.org/10.1142/S021979950600048X","url":null,"abstract":"A novel monopole-type antenna, which covers the bandwidth 3.1–10.6 GHz is presented. The shorted and folded planar monopole antenna is constructed by folding a thin copper sheet in such a way that one edge of the radiating element is connected to the ground plane. Simulated and measured results show suitable characteristics for communications systems using ultrawide-band (UWB) technology. Moreover, its reduced dimensions make this antenna a valuable candidate for vehicular, in-door and mobile applications.","PeriodicalId":185917,"journal":{"name":"Int. J. Wirel. Opt. Commun.","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123140984","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
Numerical Noise Introduced by the Alternating Direction-Implicit Scheme in FDTD for UWB Systems 超宽带系统时域有限差分中交替方向隐式格式引入的数值噪声
Int. J. Wirel. Opt. Commun. Pub Date : 2006-08-01 DOI: 10.1142/S0219799506000430
A. Thiry, F. Costen, A. Brown
{"title":"Numerical Noise Introduced by the Alternating Direction-Implicit Scheme in FDTD for UWB Systems","authors":"A. Thiry, F. Costen, A. Brown","doi":"10.1142/S0219799506000430","DOIUrl":"https://doi.org/10.1142/S0219799506000430","url":null,"abstract":"The numerical noise for spherical wave Ultra WideBand (UWB) signals originating from the Alternating Direction-Implicit (ADI) Finite Difference Time Domain (FDTD) scheme is quantified. A practical assessment is then provided to evaluate the numerical noise of the ADI-FDTD method relative to the FDTD method. The study reveals the influence of the temporal and spatial discretisation in conjunction with the maximum frequency of the excitation on the numerical noise. The result can be used for the determination of the temporal discretisation for the acceptable numerical noise increase compared with FDTD prior to running any simulation.","PeriodicalId":185917,"journal":{"name":"Int. J. Wirel. Opt. Commun.","volume":"1994 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131148744","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
Antenna Time Domain Planar Near Field Measurement System 天线时域平面近场测量系统
Int. J. Wirel. Opt. Commun. Pub Date : 2006-08-01 DOI: 10.1142/S0219799506000429
Nan Wang, Zheng-Hui Xue, Shing-Ming Yang, B. Gao, Xiao-Wen Xu
{"title":"Antenna Time Domain Planar Near Field Measurement System","authors":"Nan Wang, Zheng-Hui Xue, Shing-Ming Yang, B. Gao, Xiao-Wen Xu","doi":"10.1142/S0219799506000429","DOIUrl":"https://doi.org/10.1142/S0219799506000429","url":null,"abstract":"Antenna time domain planar near field measurement is a new Ultra-WideBand (UWB) technology for getting Antenna Under Test (AUT)'s time or frequency domain radiant characteristics within a wide frequency band. In this paper, besides introducing basic theories and technologies, we have developed an antenna time domain planar near-field measurement system and showed from measurement results, the validity of our theories and the feasibility of our system.","PeriodicalId":185917,"journal":{"name":"Int. J. Wirel. Opt. Commun.","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128469541","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: 10
Effects of Antennas Characteristics on UWB Body Area Propagation Channel 天线特性对超宽带体区传播信道的影响
Int. J. Wirel. Opt. Commun. Pub Date : 2006-08-01 DOI: 10.1142/S0219799506000491
H. Ghannoum, C. Roblin, S. Bories
{"title":"Effects of Antennas Characteristics on UWB Body Area Propagation Channel","authors":"H. Ghannoum, C. Roblin, S. Bories","doi":"10.1142/S0219799506000491","DOIUrl":"https://doi.org/10.1142/S0219799506000491","url":null,"abstract":"The effects of different UWB antennas on body area propagation channel is analyzed. Different orientations of directional antennas and different spacings between planar antennas and the body are investigated in an on-body scenario. Time domain channel parameters, e.g. mean delay and delay spread, are extracted from measurement data. The distribution of the channel parameters allows classification of the different antennas with respect to each parameter.","PeriodicalId":185917,"journal":{"name":"Int. J. Wirel. Opt. Commun.","volume":"130 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121426554","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
Resistance Loaded Planar Antenna within a Rectangular Parallelepiped Cavity for UWB System 用于超宽带系统的矩形平行六面体腔内电阻加载平面天线
Int. J. Wirel. Opt. Commun. Pub Date : 2006-08-01 DOI: 10.1142/S0219799506000478
M. Taguchi, Takeshi Ohashi, Kazumasa Tanaka
{"title":"Resistance Loaded Planar Antenna within a Rectangular Parallelepiped Cavity for UWB System","authors":"M. Taguchi, Takeshi Ohashi, Kazumasa Tanaka","doi":"10.1142/S0219799506000478","DOIUrl":"https://doi.org/10.1142/S0219799506000478","url":null,"abstract":"A resistance loaded planar monopole antenna and dipole antenna within a rectangular parallelepiped cavity are numerically and experimentally analyzed. In the numerical analysis, IE3D based on the Method of Moment and Fidelity based on the FDTD method are used. The planar dipole antenna has the broadband VSWR characteristic and unidirectional radiation characteristics within 3.1–10.6 GHz.","PeriodicalId":185917,"journal":{"name":"Int. J. Wirel. Opt. Commun.","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129732420","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
Ultra-Wide Band Pulse Transmitting through Resonant Antennas 谐振天线的超宽带脉冲传输
Int. J. Wirel. Opt. Commun. Pub Date : 2006-08-01 DOI: 10.1142/S0219799506000466
W. Yao, Y. Wang
{"title":"Ultra-Wide Band Pulse Transmitting through Resonant Antennas","authors":"W. Yao, Y. Wang","doi":"10.1142/S0219799506000466","DOIUrl":"https://doi.org/10.1142/S0219799506000466","url":null,"abstract":"A novel concept called direct antenna modulation (DAM) is proposed for short pulse transmitting through resonant antennas. The essence is based on the nonlinear transient responses of the antenna. By integrating RF switches at particular positions on a resonant antenna such as a patch antenna, the modulating signal is able to turn on and off the antenna's radiation by means of opening or shorting the radiation slots directly. Therefore, the antenna behaves as an integrated pulse generator, modulator and radiator. It is observed that short pulses with rich spectrum components outside the antenna bandwidth can be radiated this way. The radiated signal bandwidth is no longer limited by the original antenna impedance matching bandwidth, but by the performance of the switching devices. The experimental results show that a patch antenna with a resonant frequency 2.4 GHz and a 30 MHz bandwidth can transmit a digitally modulated signal with more than 400 MHz bandwidth.","PeriodicalId":185917,"journal":{"name":"Int. J. Wirel. Opt. Commun.","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123225181","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
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