tailieunhanh - Báo cáo hóa học: " Research Article Evaluation of Diversity Antenna "

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Evaluation of Diversity Antenna | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 58769 11 pages doi 2007 58769 Research Article Evaluation of Diversity Antenna Designs Using Ray Tracing Measured Radiation Patterns and MIMO Channel Measurements Arindam Pal Chris Williams Geoff Hilton and Mark Beach Centre for Communications Research University of Bristol Bristol BS8 1UB UK Received 31 March 2006 Revised 11 September 2006 Accepted 23 October 2006 Recommended by Merouane Debbah This paper presents an evaluation of the MIMO performance of three candidate antenna array designs each embedded within a PDA footprint using indoor wideband channel measurements at GHz alongside channel simulations. A channel model which employs the plane-wave approximation was used to combine the embedded antenna radiation patterns of the candidate devices obtained from far-field pattern measurements and multipath component parameters from an indoor ray-tracer. The 4-element candidate arrays were each constructed using a different type of antenna element and despite the diverse element directivities pattern characteristics and polarization purities all three devices were constructed to fully exploit diversity in polarization space and angle. Thus low correlation and high information theoretic capacity was observed in each case. A good match between the model and the measurements is also demonstrated especially for 2 X 2 MIMO subsets of identically or orthogonally polarized linear slot antennas. The interdependencies between the channel XPD directional spread and pathloss and the respective impact on channel capacity are also discussed in this paper. Copyright 2007 Arindam Pal et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION Multiple-input multiple-output MIMO wireless