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J. Electromagn. Eng. Sci > Volume 13(2); 2013 > Article
Journal of Electromagnetic Engineering and Science 2013;13(2):86-92.
DOI: https://doi.org/10.5515/JKIEES.2013.13.2.86   
Definition of Antenna Diversity Gain in User-Distributed 3D-Random Line-of-Sight
Per-Simon Kildal1, Ulf Carlberg2, Jan Carlsson2
1Department of Signals and Systems, Chalmers University of Technology
2SP Technical Research Institute of Sweden
The present paper defines diversity gain for stationary users. This deals in particular with gathering the received signal statistics over possible user positions and orientations in space rather than over time, and to define a meaningful diversity gain related to the cumulative improvement of the performances of the 1% users with the worst receiving conditions. The definition is used to evaluate diversity gain for some typical small antennas in an extreme environment with only line-of-sight (LOS). The LOS environment is regarded as user-distributed 3D-random LOS caused by the statistics of an ensemble of stationary users with arbitrary orientations in the horizontal plane (2D), and with arbitrary orientations of their wireless devices in the vertical plane. Thus, an overall 3D-random distribution of user orientation is assumed.
Key words: Antenna Diversity Gain, MIMO, Line-of-Sight, OTA Measurements
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