Correlation Technologies for OTA Testing of Mobile Devices: Power-Density Measurement

International audienceIn this paper, we introduce new correlation technologies for measuring Power-Density of mobile devices in the framework of Over The Air (OTA) testing. The correlation technologies use convolutional signal processing algorithms. Measurements obtained using minimally invasive ElectroOptical (EO) probes are compared to those from classical nearfield and far-field measurement solutions demonstrating excellent accuracy for applications at mmWave frequencies. Influence of separation distance between the Device Under Test (DUT) and the probing system (PS) on the near-field spatial correlation functions is studied. Broadband measurement results are successfully compared to full-wave 3D EM solvers in time and frequency domains. Perspectives for optically synchronized interferometric-correlation technologies are drawn for accurate measurements, in noisy environments, of stochastic EM fields using power-spectra and energy-spectra metrics

Correlation Technologies for OTA Testing of mmWave Mobile Devices Using Energy Metrics

International audienceIn this paper, we introduce correlation technologies both at RF/mmWave and Base-Band frequencies. At RF and mmWave frequencies power-spectra and energy-spectra metrics are introduced for measuring the power-density of mobile devices and systems. The use of unified power-spectra and energy-spectra metrics leads to innovative Electromagnetic-Thermal sensing solutions for OTA-Testing. At Base-Band frequencies, DSP-based Convolutional-Accelerators are proposed for fast and accurate measurement of EVM (Error Vector Magnitude) using correlation technologies. New ASIC-embedded Smart-Connectors are developed for bringing correlation-based signal processing close to antenna-in-package (AiP) modules. Porting of the DSP-based Convolutional-Accelerators into advanced FD-SOI-ASIC platforms for co-integration with adaptive RF/mmWave FrontEnd-Modules will enable real-time extraction of auto-correlation and cross-correlation functions of stochastic signals for mobile devices and systems. Perspectives toward optically synchronized interferometric-correlation technologies are drawn for accurate measurements of stochastic EM fields in noisy environments