Abstract-Mode-stirred reverberation chambers (MSRCs) are a useful tool for measuring several wireless-related MIMO antenna parameters. In a conventional single-cavity MSRC, the emulated fading environment is isotropic and the amplitude of the signal is Rayleigh distributed. Previous contributions have enhanced the emulation capabilities of MSRCs so as to include the ability to emulate Rician-and non-isotropic fading environments. In this contribution, arbitrary amplitude probability density functions (PDF) emulation using a MSRC is presented by selecting parts of the sample set that forms different statistical ensembles. Several algorithms are presented and compared in terms of computation time and power accuracy using simulated as well as measured data from different MSRCs to obtain Rician, on-body and amplitude PDFs of standardized models. The technique is patent-protected by EMITE.

No abstract

This paper studies the effect that the user presence has over diversity performance for two different dual antenna prototypes. For the purpose of this study, both prototypes are specially designed to have good and bad diversity performance at LTE band XII (699-746 MHz). User influence over the propagation environment is also studied. The study reveals that user influence does not have a linear effect over diversity performance. On the contrary, improvement or degradation is appreciated depending on the prototype. Differences of performance between good and bad handsets are decreased when the user influence becomes more important.

Mode-stirred chambers provide an excellent tool for antenna characterization and MIMO OTA compliance testing of wireless devices. Recent research has focused on making the mode-stirred chamber technique more versatile. One result of these efforts is the sample selection technique, by which a sub-set of data with specific properties is extracted from a measured set of raw data. This paper presents how to apply the sample selection technique to measurements of the correlation coefficient for MIMO OTA evaluation of wireless devices. Theoretical background and useful mathematical relations are presented. The application is verified through measurements.