Pub Date : 2007-11-21DOI: 10.1109/ICEAA.2007.4387368
A. Pellegrini, A. Monorchio, G. Manara
A novel hybrid Mode Matching/Finite Element/Spectral Decomposition (MM/FE/SD) approach is applied to the analysis of finite but large arrays. The proposed technique combines the numerical efficiency of the MM procedure and the versatility of the FE method with the capability of the SD to handle the finite problem. In particular, the MM/FE method is employed to obtain the Generalized Scattering Matrix (GSM) of the single unit cell of the infinite phased array. The SD allows us to solve the finite large problem as a summation of infinite periodic problems through a Discrete Fourier Transform (DFT) approach. The methodology is here extended to deal with arbitrarily oriented directions (three-dimensional problems), by taking into account also the depolarization effects.
{"title":"Analysis of Finite Large Phased Arrays of Waveguides by the Mode Matching/Finite Element and a Spectral Decomposition Approach","authors":"A. Pellegrini, A. Monorchio, G. Manara","doi":"10.1109/ICEAA.2007.4387368","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387368","url":null,"abstract":"A novel hybrid Mode Matching/Finite Element/Spectral Decomposition (MM/FE/SD) approach is applied to the analysis of finite but large arrays. The proposed technique combines the numerical efficiency of the MM procedure and the versatility of the FE method with the capability of the SD to handle the finite problem. In particular, the MM/FE method is employed to obtain the Generalized Scattering Matrix (GSM) of the single unit cell of the infinite phased array. The SD allows us to solve the finite large problem as a summation of infinite periodic problems through a Discrete Fourier Transform (DFT) approach. The methodology is here extended to deal with arbitrarily oriented directions (three-dimensional problems), by taking into account also the depolarization effects.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128160404","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}
Pub Date : 2007-11-21DOI: 10.1109/ICEAA.2007.4387223
K. Bialkowski, A. Postula, A. Abbosh, M. Bialkowski
The paper describes a Multiple Input Multiple Output communication testbed for operation in a dual 2.4 GHz/5 GHz band, which is under development at the University of Queensland. This advanced testing equipment makes use of Field Programmable Gate Array technology for fast processing of the baseband signals. Its RF modules include commercially available RF transceiver chips and in-house developed antennas. Using a 100 Mbit Ethernet network connection and a Web browser, the estimated channel matrices and received and decoded signal constellations can be visualized in quasi realtime on a personal computer.
{"title":"2×2 MIMO Testbed for Dual 2.4GHz/5GHz Band","authors":"K. Bialkowski, A. Postula, A. Abbosh, M. Bialkowski","doi":"10.1109/ICEAA.2007.4387223","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387223","url":null,"abstract":"The paper describes a Multiple Input Multiple Output communication testbed for operation in a dual 2.4 GHz/5 GHz band, which is under development at the University of Queensland. This advanced testing equipment makes use of Field Programmable Gate Array technology for fast processing of the baseband signals. Its RF modules include commercially available RF transceiver chips and in-house developed antennas. Using a 100 Mbit Ethernet network connection and a Web browser, the estimated channel matrices and received and decoded signal constellations can be visualized in quasi realtime on a personal computer.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128292859","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}
Pub Date : 2007-11-21DOI: 10.1109/ICEAA.2007.4387334
J. Farooq, M. A. Temple, M. Saville
Cross-range resolution in spotlight synthetic aperture radar (SAR) is primarily a function of the angular extent (DeltaPhi) over which data is collected. One proposed means for improving cross-range resolution for a given DeltaPhi is the use of frequency diverse array (FDA) techniques. The goal is to exploit an apparent increase in DeltaPhi to improve cross-range resolution while retaining benefits of shorter synthetic apertures and integration times.
{"title":"Application of Frequency Diverse Arrays to Synthetic Aperture Radar Imaging","authors":"J. Farooq, M. A. Temple, M. Saville","doi":"10.1109/ICEAA.2007.4387334","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387334","url":null,"abstract":"Cross-range resolution in spotlight synthetic aperture radar (SAR) is primarily a function of the angular extent (DeltaPhi) over which data is collected. One proposed means for improving cross-range resolution for a given DeltaPhi is the use of frequency diverse array (FDA) techniques. The goal is to exploit an apparent increase in DeltaPhi to improve cross-range resolution while retaining benefits of shorter synthetic apertures and integration times.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"16 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131071554","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}
Pub Date : 2007-11-21DOI: 10.1109/ICEAA.2007.4387431
Tian Yubo, Dong Yue, Zhang Xiaoqiu, Zhu Renjie
Feedforward perceptron multilayer (PML) ANNs with error back propagation learning method is often used in engineering design. Unfortunately, its generalization is often poor. In this paper, some reformative methods are proposed to improve its generalization. Based on the improved PML ANN, E-plane T-kind terminal matched load of rectangular waveguide is designed successfully. The result given by the ANN is agreeable with FDTD very well.
{"title":"Perceptron Multilayer Artificial Neural Network with Good Generalization","authors":"Tian Yubo, Dong Yue, Zhang Xiaoqiu, Zhu Renjie","doi":"10.1109/ICEAA.2007.4387431","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387431","url":null,"abstract":"Feedforward perceptron multilayer (PML) ANNs with error back propagation learning method is often used in engineering design. Unfortunately, its generalization is often poor. In this paper, some reformative methods are proposed to improve its generalization. Based on the improved PML ANN, E-plane T-kind terminal matched load of rectangular waveguide is designed successfully. The result given by the ANN is agreeable with FDTD very well.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132409417","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}
Pub Date : 2007-11-21DOI: 10.1109/ICEAA.2007.4387326
D. Tsilimantos, G. Tsoulos, D. Kaklamani
The issue of UMTS WCDMA radio network planning is studied in this paper. The impact that smart antennas can have on essential WCDMA network parameters is demonstrated with the help of a radio network planning tool, by means of Monte Carlo simulations. The scope of this paper is to demonstrate with simulations from a typical urban operational scenario how advanced techniques like smart antennas can provide multiple operational advantages and why careful planning is so important.
{"title":"Radio Network Planning for UMTS with Smart Antennas","authors":"D. Tsilimantos, G. Tsoulos, D. Kaklamani","doi":"10.1109/ICEAA.2007.4387326","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387326","url":null,"abstract":"The issue of UMTS WCDMA radio network planning is studied in this paper. The impact that smart antennas can have on essential WCDMA network parameters is demonstrated with the help of a radio network planning tool, by means of Monte Carlo simulations. The scope of this paper is to demonstrate with simulations from a typical urban operational scenario how advanced techniques like smart antennas can provide multiple operational advantages and why careful planning is so important.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"139 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131693679","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}
Pub Date : 2007-11-21DOI: 10.1109/ICEAA.2007.4387452
W. Malik, D. Edwards, Yongwei Zhang, A.K. Brown
A typical ultra wideband (UWB) antenna acts as a space-frequency filter. As a result, the UWB signal transmitted or received by such an antenna undergoes joint angular-spectral distortion, and consequently the system suffers serious performance degradation. We discuss a technique to compensate for this distortion and recover the original signal using multiple antenna arrays. To evaluate its performance, the proposed technique is applied to UWB signal propagation in an indoor multipath environment simulated using a specialized ray-tracing approach. The results demonstrate that our antenna equalization scheme significantly reduces the effect of small-scale fading introduced by the antennas, and can therefore improve the performance of a UWB communications link as well as facilitate the extraction of antenna-independent channel measurements.
{"title":"Three-Dimensional Equalization of Ultrawideband Antenna Distortion","authors":"W. Malik, D. Edwards, Yongwei Zhang, A.K. Brown","doi":"10.1109/ICEAA.2007.4387452","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387452","url":null,"abstract":"A typical ultra wideband (UWB) antenna acts as a space-frequency filter. As a result, the UWB signal transmitted or received by such an antenna undergoes joint angular-spectral distortion, and consequently the system suffers serious performance degradation. We discuss a technique to compensate for this distortion and recover the original signal using multiple antenna arrays. To evaluate its performance, the proposed technique is applied to UWB signal propagation in an indoor multipath environment simulated using a specialized ray-tracing approach. The results demonstrate that our antenna equalization scheme significantly reduces the effect of small-scale fading introduced by the antennas, and can therefore improve the performance of a UWB communications link as well as facilitate the extraction of antenna-independent channel measurements.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129268505","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}
Pub Date : 2007-11-21DOI: 10.1109/ICEAA.2007.4387232
J. Timmermann, M. Porebska, C. Sturm, W. Wiesbeck
Electromagnetic wave propagation of UWB signals can be interpreted as a superposition of narrowband electromagnetic wave propagation for a large set of frequencies. Since channel and antenna radiation patterns depend on frequency, describing and modeling the system transfer function of a UWB system including channel and antennas is more challenging compared to a narrowband system. This paper compares mathematical modeling of UWB freespace propagation to the more realistic case of UWB multipath propagation in indoor scenarios. Simulation results based on 3D Ray Tracing visualize the effect of both indoor channel and antennas on the UWB transmit signal in an indoor scenario, and finally, it is demonstrated, how signal distortions can be compensated by inverse filtering using an estimated system transfer function.
{"title":"Comparing UWB Freespace Propagation and Indoor Propagation Including Non-ideal Antennas","authors":"J. Timmermann, M. Porebska, C. Sturm, W. Wiesbeck","doi":"10.1109/ICEAA.2007.4387232","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387232","url":null,"abstract":"Electromagnetic wave propagation of UWB signals can be interpreted as a superposition of narrowband electromagnetic wave propagation for a large set of frequencies. Since channel and antenna radiation patterns depend on frequency, describing and modeling the system transfer function of a UWB system including channel and antennas is more challenging compared to a narrowband system. This paper compares mathematical modeling of UWB freespace propagation to the more realistic case of UWB multipath propagation in indoor scenarios. Simulation results based on 3D Ray Tracing visualize the effect of both indoor channel and antennas on the UWB transmit signal in an indoor scenario, and finally, it is demonstrated, how signal distortions can be compensated by inverse filtering using an estimated system transfer function.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125393726","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}
Pub Date : 2007-11-21DOI: 10.1109/ICEAA.2007.4387324
G. de la Roche, X. Gallon, J. Gorce, G. Villemaud
In this article fast fading in indoor environments is predicted, using the MR-FDPF algorithm. MR-FDPF (frequency domain par flow) is a FDTD like method that can compute indoor radio coverage at a very precise resolution (a few centimeters). Using the simulated points in particular regions, it is possible to plot the distribution of the power signal, and to fit this distribution with Rice laws. In order to confirm our results, real radio measurements have also been done. In the considered environment, MR-FDPF has been proved to be efficient for the prediction of statistics of fading channels in indoor environment.
{"title":"On predicting fast fading strength from Indoor 802.11 simulations","authors":"G. de la Roche, X. Gallon, J. Gorce, G. Villemaud","doi":"10.1109/ICEAA.2007.4387324","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387324","url":null,"abstract":"In this article fast fading in indoor environments is predicted, using the MR-FDPF algorithm. MR-FDPF (frequency domain par flow) is a FDTD like method that can compute indoor radio coverage at a very precise resolution (a few centimeters). Using the simulated points in particular regions, it is possible to plot the distribution of the power signal, and to fit this distribution with Rice laws. In order to confirm our results, real radio measurements have also been done. In the considered environment, MR-FDPF has been proved to be efficient for the prediction of statistics of fading channels in indoor environment.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126933372","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}
Pub Date : 2007-11-21DOI: 10.1109/ICEAA.2007.4387421
P. Savi, L.A. Maio
The properties of the TDR waveforms are studied by means of the Debye's permittivity equation and of a low-order model of the measurement setup. The study is aimed at obtaining guidelines useful for the estimation of the soil permittivity from TDR waveforms. The high frequency attenuation due to the propagation in the dielectric medium has a central role in deciding the shape of the TDR waveforms. High-frequency permittivity parameters are best estimated from waveforms produced by measurement system with low attenuation. The properties of waveforms also lead to simple relations to estimate the low and high frequency permittivity values from characteristic points of the waveforms.
{"title":"Soil Permittivity Estimation from TDR Measurements: properties and guidelines","authors":"P. Savi, L.A. Maio","doi":"10.1109/ICEAA.2007.4387421","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387421","url":null,"abstract":"The properties of the TDR waveforms are studied by means of the Debye's permittivity equation and of a low-order model of the measurement setup. The study is aimed at obtaining guidelines useful for the estimation of the soil permittivity from TDR waveforms. The high frequency attenuation due to the propagation in the dielectric medium has a central role in deciding the shape of the TDR waveforms. High-frequency permittivity parameters are best estimated from waveforms produced by measurement system with low attenuation. The properties of waveforms also lead to simple relations to estimate the low and high frequency permittivity values from characteristic points of the waveforms.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123110238","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}
Pub Date : 2007-11-21DOI: 10.1109/ICEAA.2007.4387453
D. Manteuffel, T.-A. Ould-Mohamed, J. Romme
In this paper the effect of antenna integration in typical UWB consumer electronic products on the entire system performance is evaluated for a system model based on MB-OFDM. The antenna in its specific integration scenario is characterized by the full wave FDTD method. Different deterministic indoor channels are characterized using ray-tracing simulation. Based on the analysis the channel transfer function, including the antennas can be derived in terms of S-parameters. From the transfer function of the antennas and the channels different antenna and channel related measures like RMS delay spread or frequency depended radiation pattern are derived. In order to evaluate the impact on the entire link performance a MatLab Simulink model of a UWB system is used to model the entire system. The system related parameters like BER (Bit Error Rate) are evaluated with reference to different antenna integrations and link scenarios.
{"title":"Impact of Integration in Consumer Electronics on the performance of MB-OFDM UWB","authors":"D. Manteuffel, T.-A. Ould-Mohamed, J. Romme","doi":"10.1109/ICEAA.2007.4387453","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387453","url":null,"abstract":"In this paper the effect of antenna integration in typical UWB consumer electronic products on the entire system performance is evaluated for a system model based on MB-OFDM. The antenna in its specific integration scenario is characterized by the full wave FDTD method. Different deterministic indoor channels are characterized using ray-tracing simulation. Based on the analysis the channel transfer function, including the antennas can be derived in terms of S-parameters. From the transfer function of the antennas and the channels different antenna and channel related measures like RMS delay spread or frequency depended radiation pattern are derived. In order to evaluate the impact on the entire link performance a MatLab Simulink model of a UWB system is used to model the entire system. The system related parameters like BER (Bit Error Rate) are evaluated with reference to different antenna integrations and link scenarios.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126376045","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}
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