Emulation methodology of multiple clusters channels for evaluating wireless communication devices over-the-air (OTA) performance is investigated. This methodology has been used along with the implementation of the SIMO LTE standard. It consists of evaluating effective diversity gain (EDG) level of SIMO LTE-OFDM system for different channel models according to the received power by establishing an active link between the transmitter and the receiver. The measurement process is set up in a Reverberation Chamber (RC). The obtained results are compared to the reference case of single input-single output (SISO) in order to evaluate the real improvement attained by the implemented system.
A mode-stirred reverberation chamber (RC) is nowadays a commonly accepted performing tool for over-the-air (OTA) communication system evaluation, and their standardization is underway. Before performing active measurements of wireless communication systems using an RC, field uniformity inside the RC working volume has to be measured following the calibration method described in IEC standards 61000-4-21 and 61000-4-3, which requires 24 calibration measurements of field amplitude. In this contribution, we present the statistical laws that describe electromagnetic field maxima distribution, and based on them, a novel expression that could be useful to obtain a lower limit for the number of stirrer positions required at least to obtain a specific value for the normalized dispersion used to evaluate field uniformity with the IEC calibration method, being therefore of particular interest for OTA measurements.
International audienceReverberation chambers (RC) are cost-effective tools for evaluating Multiple-Input Multiple-Output (MIMO) Over-The-Air (OTA) communication systems performance. In order to assess their performance, several figures-of-merit (FOM) are made use of, such as diversity gain, which is typically used to present the effectiveness of a diversity antenna system. Nevertheless, scarce publications related to the effect of root mean square (RMS) delay spread on these figures-of-merits can be found in the literature. In this contribution, we present an analysis of the dependence of the effective antenna diversity gain on the RMS delay spread of a wireless channel by means of a multi-antenna OTA communication system using a QPSK modulation inside an RC. For that purpose, several channel RMS delay spread profiles have been achieved inside the RC by varying the amount of absorbing material placed within its cavity
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