The Metrology for Wireless Systems Group’s work in modulated-signal measurement and traceability is about developing measurement procedures and assisting in standards activities for calibrated measurements of modulated communication signals, with emphasis on microwave and millimeter-wave frequency bands. The key questions revolve around how real-world linear and nonlinear distortion affects the measurement accuracy of these signals so that users can separate the effects of distortion caused by the instrumentation from distortion caused by the device under test. This, in turn, is critical for understanding the reliability of common wireless metrics derived from measurement such as bit-error rate (BER), error vector magnitude (EVM) and average power.
To truly understand the impact of distortion from instrumentation on measurement and to enable industry-wide agreement between measured quantities, our work focuses on providing a full traceability path with uncertainties. We support new measurements and calibrations for current (4G) cellular wireless and other technologies, and we provide best-practice techniques and traceability for future 5G wireless systems.
Specifically, we are: