Abstract
AbstractA series of experiments were conducted on the uplink diversity characteristics for a mobile communication system using the random field method. In contrast to past belief, it was found that polarization diversity systems are much more effective than space diversity systems for mobile communications. This is due to the orientation of mobile antennas that are tilted about 60° from the zenith in normal conversation state and by the horizontal polarization component that is generated by the human body and mobile phone casing.In addition to the above, a comparison of antenna radiating elements was also made— vertical/horizontal versus 45° crossed dipoles— on the diversity effect of the receiving system at the base station. It was found that the 45° crossed dipoles were slightly more effective than the vertical/horizontal elements in the case of line‐of‐sight coverage, but for out‐of‐sight coverage, the difference was not significant. © 2002 Wiley Periodicals, Inc. Electron Comm Jpn Pt 1, 85(7): 32–44, 2002; Published online in Wiley Interscience (www.interscience.wiley.com). DOI 10.1002/ecja.1109
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