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2007 European Conference on Wireless Technologies最新文献

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Novel Digital Front End Based Interference Detection Methods 基于数字前端的新型干扰检测方法
2007 European Conference on Wireless Technologies Pub Date : 2007-12-17 DOI: 10.1109/ECWT.2007.4403948
A. Mayer, L. Maurer, G. Hueber, B. Lindner, C. Wicpalek, R. Hagelauer
{"title":"Novel Digital Front End Based Interference Detection Methods","authors":"A. Mayer, L. Maurer, G. Hueber, B. Lindner, C. Wicpalek, R. Hagelauer","doi":"10.1109/ECWT.2007.4403948","DOIUrl":"https://doi.org/10.1109/ECWT.2007.4403948","url":null,"abstract":"The concept of Cognitive Radio (CR) is based on detecting the environmental radio spectrum, sensing changes and responding/reacting accordingly. Environmental observation requires methods for interference detection and evaluating the current spectral allocation. It is shown that classical methods of spectrum analysis like the Fast Fourier Transformation (FFT) have critical shortcomings in fullfilling the requirements of CR. The pivotal focus of this paper is to propose alternative approaches suitable for integration into the Digital Front End (DFE) of the Users Equipment (UE).","PeriodicalId":448587,"journal":{"name":"2007 European Conference on Wireless Technologies","volume":"391 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129171978","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
Estimation and Compensation of Radiated Feedback Coupling in a High Gain Repeater Using Gain Dithering 基于增益抖动的高增益中继器辐射反馈耦合估计与补偿
2007 European Conference on Wireless Technologies Pub Date : 2007-12-17 DOI: 10.1109/ECWT.2007.4403980
R. Braithwaite
{"title":"Estimation and Compensation of Radiated Feedback Coupling in a High Gain Repeater Using Gain Dithering","authors":"R. Braithwaite","doi":"10.1109/ECWT.2007.4403980","DOIUrl":"https://doi.org/10.1109/ECWT.2007.4403980","url":null,"abstract":"On-frequency repeaters, whose input and output signals are the same frequency, often experience radiated coupling between the input and output antennas which causes echoes to be transmitted. In addition, the repeater will oscillate if the forward gain of the repeater is higher than the isolation between antennas. This paper proposes a method of estimating and compensating for the effects of the radiated coupling using digital processing. The real and imaginary components of the forward gain are dithered. The change in the power spectrum of the signal in response to the dithering is used to estimate the residual feedback coupling and reduce the echo magnitude. The dithering based echo measurements are unaffected by the autocorrelation of the input signal making it suitable for repeaters with low insertion delay. Results based on computer simulation models are provided.","PeriodicalId":448587,"journal":{"name":"2007 European Conference on Wireless Technologies","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123578548","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
60 GHz UWB-IR Transceiver With Pulsed-Injected Locked Oscillator 60 GHz UWB-IR收发器与脉冲注入锁定振荡器
2007 European Conference on Wireless Technologies Pub Date : 2007-12-17 DOI: 10.1109/EUMC.2007.4405374
N. Deparis, A. Boe, C. Loyez, N. Rolland, P. Rolland
{"title":"60 GHz UWB-IR Transceiver With Pulsed-Injected Locked Oscillator","authors":"N. Deparis, A. Boe, C. Loyez, N. Rolland, P. Rolland","doi":"10.1109/EUMC.2007.4405374","DOIUrl":"https://doi.org/10.1109/EUMC.2007.4405374","url":null,"abstract":"A simple but efficient transceiver for UWB Impulse Radio (UWB-IR) signal generation in millimeter-wave band for Giga-bit WLAN is presented. The emitter involves a subharmonic Injection Locked Oscillator (ILO) driven by a pulse generator with fast transition time. Its frequency oscillation is locked to one of the numerous harmonic components of the pulse generator at 30 GHZ, which permits to obtain a stable pulse to pulse phase condition. The start of the oscillations is studied, using the external quality factor Qext as main factor. Then a frequency doubler permits this modulated signal to be transposed at 60 GHz. The receiver includes a LNA, a RF-detector and a UWB Sample and Hold Amplifier (SHA). Some MMIC have been designed using a commercial pHEMT foundry process (ft = 100 GHz=): a pulse generator exhibiting less than 25 ps transition times, an oscillator with a 30 GHz free running output frequency, a LNA, a MPA, a RF detector at 60 GHz and a UWB SHA.","PeriodicalId":448587,"journal":{"name":"2007 European Conference on Wireless Technologies","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125624315","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
Novel Design of UWB Antenna with Band - Notch Capability 具有带陷波能力的超宽带天线的新设计
2007 European Conference on Wireless Technologies Pub Date : 2007-12-17 DOI: 10.1109/ECWT.2007.4403942
E. Pancera, D. Modotto, A. Locatelli, F. M. Pigozzo, C. de Angelis
{"title":"Novel Design of UWB Antenna with Band - Notch Capability","authors":"E. Pancera, D. Modotto, A. Locatelli, F. M. Pigozzo, C. de Angelis","doi":"10.1109/ECWT.2007.4403942","DOIUrl":"https://doi.org/10.1109/ECWT.2007.4403942","url":null,"abstract":"An ultra-wideband (UWB) antenna with a narrow frequency notch is presented. The antenna has been fabricated on a Duroid 5870 substrate and occupies an area of only 30times35 mm2. Starting from a trapezoidal planar patch exhibiting a VSWR smaller than 2.5 in the 3.5-10 GHz band, a frequency notch at 5.65 GHz is introduced by two slots near the coplanar waveguide feeding the patch. The measured return loss shows a good agreement with the simulation results and proves that this kind of antenna is suitable for reducing the detrimental interference effects of WLAN, operating around 5.5 GHz, on UWB radio links.","PeriodicalId":448587,"journal":{"name":"2007 European Conference on Wireless Technologies","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131231629","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: 49
Modeling Multiple Access Interference in Ad Hoc Networks Based on IR-UWB Signals Up-Converted to 60 GHz 基于IR-UWB信号上变频60ghz的Ad Hoc网络多址干扰建模
2007 European Conference on Wireless Technologies Pub Date : 2007-12-17 DOI: 10.1109/ECWT.2007.4403957
H. Ghannudi, Laurent Clavier, P. Rolland
{"title":"Modeling Multiple Access Interference in Ad Hoc Networks Based on IR-UWB Signals Up-Converted to 60 GHz","authors":"H. Ghannudi, Laurent Clavier, P. Rolland","doi":"10.1109/ECWT.2007.4403957","DOIUrl":"https://doi.org/10.1109/ECWT.2007.4403957","url":null,"abstract":"This paper presents the performance of Impulse Radio Ultra Wide Band up-converted at the 60 GHz band for high rate ad hoc network. Our main concern is the impact of the ad hoc scenario associated with directive antennas on the system performance. Spatial diversity inherent to the ad hoc context, associated with directive antennas, allows good performance. However, performance is limited by multiple access interference (MAI). We propose three different methods to estimate MAI: a non parametric estimation, the Generalized Gaussian and the alpha-stable distributions. MAI is the additive of low interferers' contributions with a Gaussian like behavior and strong interferers which generate a heavy tail distribution. In this last case, the alpha-stable approach gives better results. We show that material and network constraints can significantly affect the nature of the MAI.","PeriodicalId":448587,"journal":{"name":"2007 European Conference on Wireless Technologies","volume":"307 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114280593","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
Bandlimiting Polar Signals with Special W-CDMA Constellations 特殊W-CDMA星座的限带极信号
2007 European Conference on Wireless Technologies Pub Date : 2007-12-17 DOI: 10.1109/ECWT.2007.4403938
B. Lindner, G. Strasser, L. Maurer, Z. Boos, R. Hagelauer
{"title":"Bandlimiting Polar Signals with Special W-CDMA Constellations","authors":"B. Lindner, G. Strasser, L. Maurer, Z. Boos, R. Hagelauer","doi":"10.1109/ECWT.2007.4403938","DOIUrl":"https://doi.org/10.1109/ECWT.2007.4403938","url":null,"abstract":"The polar transmitter concept promises significant higher power efficiency utilizing nonlinear power amplifiers. RF transmitters using polar transmitter technique are currently available for EDGE systems and are under development for UMTS. The UMTS extensions HSDPA and HSUPA provide a number of additional physical uplink channels which can lead to a variety of constellations incorporating constellation points at the I/Q origin. Such signals show increased activity at magnitudes around zero. This paper explains how such configurations arise and what effect a band limiting block in the magnitude signal has on signal quality indicated in EVM.","PeriodicalId":448587,"journal":{"name":"2007 European Conference on Wireless Technologies","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126091802","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
A Method for Estimating the Geometric Position of a Wireless Telemetry Capsule in Real-Time 一种实时估计无线遥测胶囊几何位置的方法
2007 European Conference on Wireless Technologies Pub Date : 2007-12-17 DOI: 10.1109/ECWT.2007.4403979
K. Arshak, F. Adepoju
{"title":"A Method for Estimating the Geometric Position of a Wireless Telemetry Capsule in Real-Time","authors":"K. Arshak, F. Adepoju","doi":"10.1109/ECWT.2007.4403979","DOIUrl":"https://doi.org/10.1109/ECWT.2007.4403979","url":null,"abstract":"In this paper, we present a discussion of work done in tracking an embedded object. A special application to telemetry capsules in the gastrointestinal (GI) tract using radio frequency (RF) signals is highlighted. We present the mathematical analysis of the procedure and consequently, an experimental validation of the concept from data captures to position determination using non linear least squares approximation. Finite difference time domain (FDTD) simulation of a suitable dipole antenna employed in the work is also presented to show that within the test range, the radiation pattern of a dipole at about 433 MHz is suitable for detecting an embedded object that is subject to the characteristics of tissue and other related structures.","PeriodicalId":448587,"journal":{"name":"2007 European Conference on Wireless Technologies","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116090527","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
Novel Wideband Six-Port Receiver Structure 新型宽带六端口接收机结构
2007 European Conference on Wireless Technologies Pub Date : 2007-12-17 DOI: 10.1109/ECWT.2007.4403999
P. Pérez-Lara, Í. Molina-Fernández, J.G. Wangiiemert-Perez, A. Gonzalez-Salguero, J. A. Medina-Rodríguez
{"title":"Novel Wideband Six-Port Receiver Structure","authors":"P. Pérez-Lara, Í. Molina-Fernández, J.G. Wangiiemert-Perez, A. Gonzalez-Salguero, J. A. Medina-Rodríguez","doi":"10.1109/ECWT.2007.4403999","DOIUrl":"https://doi.org/10.1109/ECWT.2007.4403999","url":null,"abstract":"Typical six-port direct receiver (SPDR) comprise a six-port junction, made of power dividers and hybrids, and four matched power detectors. This kind of circuit is difficult to implement in MMIC (monolithic microwave integrated circuit) technology, due to its sensitivity to fabrication tolerances. Some simple six-port structures have been recently proposed which are more suitable for integration. However, these structures exhibit a direct path between LO and RF ports, which is undesirable for homodyne receiver operation. This work presents a novel and simple wideband SPDR with high isolation between LO and RF ports. Owing to its ease of implementation and high performance, it is a good candidate to be used in low-cost mass-market radio receivers.","PeriodicalId":448587,"journal":{"name":"2007 European Conference on Wireless Technologies","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126577299","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
Estimation of Indoor Geolocation Using Amplitude-Only Data 使用仅限幅数据的室内地理定位估计
2007 European Conference on Wireless Technologies Pub Date : 2007-12-17 DOI: 10.1109/ECWT.2007.4403935
I. A. Ibraheem, J. Schoebel
{"title":"Estimation of Indoor Geolocation Using Amplitude-Only Data","authors":"I. A. Ibraheem, J. Schoebel","doi":"10.1109/ECWT.2007.4403935","DOIUrl":"https://doi.org/10.1109/ECWT.2007.4403935","url":null,"abstract":"This paper presents a technique that utilizes amplitude-only data to estimate the location in indoor wireless local area networks (WLANs). The technique is based on the Prony algorithm, which has been used for the prediction of multipath parameters. The use of amplitude-only data instead of complex data in the prediction process reduces the complexity and the cost of the data measurement and acquisition systems. Most importantly, synchronization of the base stations or coherent channel measurements is not necessary. Computer simulations for noisy and noiseless data have been performed to confirm the technique. In addition, measurements at WLAN frequencies are performed for further validation of the suggested technique.","PeriodicalId":448587,"journal":{"name":"2007 European Conference on Wireless Technologies","volume":"337 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134129514","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 CPW-fed Optimized UWB Printed Antenna 一种新型cpw馈电优化超宽带印刷天线
2007 European Conference on Wireless Technologies Pub Date : 2007-12-17 DOI: 10.1109/ECWT.2007.4403940
D. Tran, F. M. Tanyer-Tigrek, A. Vorobyov, I. Lager, L. Ligthart
{"title":"A Novel CPW-fed Optimized UWB Printed Antenna","authors":"D. Tran, F. M. Tanyer-Tigrek, A. Vorobyov, I. Lager, L. Ligthart","doi":"10.1109/ECWT.2007.4403940","DOIUrl":"https://doi.org/10.1109/ECWT.2007.4403940","url":null,"abstract":"An optimized coplanar waveguide (CPW)-fed, ultra-wideband (UWB) printed radiator is presented. Balanced shapes are incorporated to the radiating section so that the impedance is matched in a balanced manner over the intended bandwidth. Both the CPW-feed and the antenna sections are realized on one single layer of standard RT5870 high frequency laminate. The radiator possesses good UWB-characteristics in the designed spectrum (4.2 to 14.2 GHz). These include nearly perfectly symmetrical patterns, no side-lobes, no cross-polar components in the symmetrical axial plane and low cross-polar components in all other planes, balanced impedance bandwidth, and almost 4 octaves impedance bandwidth.","PeriodicalId":448587,"journal":{"name":"2007 European Conference on Wireless Technologies","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124872412","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
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