Extensive efforts are underway to standardize over the air (OTA) testing of the multiple input multiple output (MIMO) capable terminals in COST IC1004, 3GPP RAN4 and CTIA. Due to the ability to reproduce realistic radio propagation environments inside the anechoic chamber and evaluate end user metrics in real world scenarios, the multi-probe based method has attracted huge interest from both industry and academia. This contribution attempts to identify some of the measurement uncertainties of the practical multi-probe setups and provide some guidance to establish the multi-probe anechoic chamber setup. This contribution presents the results of uncertainty measurements carried out in three practical multi-probe setups. Some sources of measurement errors, i.e. cable effect, cable termination, etc. are identified based on the measurement results.
This paper discusses the radio channel modeling for MIMO Over-The-Air testing (OTA). The MIMO OTA is needed for the small devices testing, utildng multiple antennas. The technologies that utili=e multiple antennas are emerging technologies, such as LTE-A and WiMAX evolution (I EEE802. 1 1m), but we also have seen tremendeous increase of MIMO in WLAN type of applications, like IEEE802. 1 In. This paper discusses also about the testing challenge that MIMO poses for realistic testing. Index Terms-MIMO OTA, radio channel modeling 1. INTROD UCTION 1 K p(D)=-Iexp(-j2nDsin(Bo +M.)) (1) K k=l
A three-dimensional fmite-difference time-domain (FDTD) model is used to simulate basic GTEM to OATS and GTEM to free space radiated emissions correlation algorithms. The GTEM models are terminated both with the typical resistor/foam absorber load, or alternately with a numerical absorbing boundary condition to simulate a perfectly-matched load. Radiation from dipole and loop antennas and a 19" dummy EUT is simulated in FDTD GTEM, OATS, and freespace models. Comparison is shown of simulated and measured data for these same antennas and EUT fed by a comb generator. Very good agreement is shown between the measured and computed results. Several considerations regarding correlation algorithm application in one-port TEM waveguides are discussed.
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