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ABSTRACT: The phase of complex correlation is exploited to provide estimation of the azimuth arrival angle of ultra wideband multipath signals. Regarding the cluster model for uniform linear arrays, spatial correlation between antenna elements plays an important role in the analytical stage. Performance of this estimation is validated by using frequency-domain channel measurements in an anechoic chamber. Five linear array elements are used at the receiver measuring in azimuth between 0 and 360°. Furthermore, six measurement scenario cases including line-of-sight and multipath reflection are created to represent simple indoor environments. In the computation process, the complex spatial correlation coefficients between each array and the reference array are computed at each temporal multipath bin. Associated with the phase difference method, angles-of-arrival of multipath components at each time bin can be obtained. Finally, in order to verify this proposed technique, comparisons with results obtained by the sensor CLEAN algorithm are also presented.
IET Microwaves Antennas & Propagation 10/2010; · 0.68 Impact Factor
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ABSTRACT: Quantification of distortion effects on UWB system performances in terms of positioning error is analysed in this research. UWB multipath distorted channels are simulated in each frequency subband, over 2-11 GHz. Its characteristics are modelled corresponding to multipath clusters along the propagation paths. The classification of clusters and physics-based distortion mechanisms are generalized to be included into the simulation algorithm. Finally, distortion impacts on system performances regarding to frequency dependent characteristics and positioning errors are investigated.
Antennas and Propagation, 2009. EuCAP 2009. 3rd European Conference on; 04/2009
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ABSTRACT: The modified aspects for simulating UWB multipath channels are presented in this paper. Pulse distortion mechanisms based on the geometric optics and the geometric theory of diffraction are specifically generated combing with the spatio-temporal characteristics of multipath clusters based on 3times3 planar array systems. In each particular scenario, model parameters such as angle-of-arrival, angle-of-departure and time-of-arrival are statistically synthesized, corresponding to cluster groups along the propagation paths. Furthermore, characteristics of frequency dependence of propagation channels simulated over 10 frequency subbands (2-11 GHz) with 1 GHz bandwidth are also analysed.
Wideband and Ultrawideband Systems and Technologies: Evaluating current Research and Development, 2008 IET Seminar on; 12/2008
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ABSTRACT: A modified simulation of ultra-wideband (UWB) multipath channels, combined with cluster classification and physics-based pulse distortion mechanisms, is proposed in this letter. Spatiotemporal characteristics of multipath clusters are specifically generated based on 3 times 3 planar array systems with regard to scenario types and are simulated over ten frequency subbands (2-11 GHz). Thus, frequency-dependent characteristics of the propagation channels are also investigated and compared between each scenario. Finally, the probability of the bit-error rate is determined to quantify distortion effects on UWB multipath channels for all frequency subbands.
IEEE Antennas and Wireless Propagation Letters 02/2008; · 1.37 Impact Factor
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ABSTRACT: This paper presents the characterisation of ultra wideband (UWB) multipath clusters received by antenna arrays using the modified spatial correlation technique. When considering all spatial correlation coefficients in all directions, some remarkable time delays where variations of spatial correlation coefficients were clearly observed could be specified as time- of-arrivals (TOAs) of clusters. Furthermore, changing of traces of high correlation values at each time bin related to the reference array position could be used to estimate the angle- of-arrivals (AOAs) of multipath clusters. In order to verify extracted TOAs and AOAs of multipath clusters, comparison of both results with the Sensor-CLEAN algorithm was presented in this work. Finally, when employing the least- squares fitting of these distributions, variations of correlation decreasing rates related with distances and scenarios of propagation paths could be determined.
Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on; 12/2007
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ABSTRACT: This study estimates the time of arrival (TOA) of ultra wideband multipath components (MPCs) by analysing the spatial correlation of multipath signals captured by a 7times7 antenna array. In this study, both line-of-sight and non-line-of-sight radio propagation paths were considered. Each power-delay profile bin from all the array positions was used to calculate the spatial correlation between itself and the adjacent receiving point bins. Consequently, some MPC time delays and clusters, associated with high correlation values, were selected and compared with the TOA computed by the Sensor-CLEAN algorithm. A close agreement of the TOA estimated by both techniques was obtained. Finally, multipath cluster distributions and clustering model parameters are presented and compared with previously published results
IET Microwaves Antennas & Propagation 07/2007; · 0.68 Impact Factor
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ABSTRACT: A computation technique for predicting the spatial correlation coefficients, based on data captured by an ultra-wideband antenna array, is presented. Signal correlation coefficients obtained from adjacent array positions were calculated at each time bin. In addition, the application of this technique can lead to ultra-wideband multipath cluster identification. Time bins associated with high correlation values were selected as cluster arrival times and were compared with results estimated by the Sensor-CLEAN algorithm.
Electronics Letters 07/2006; · 0.96 Impact Factor
