Question: In calculating Total Radiated Sensitivity (TRS) in a Rayleigh fading 3D isotropic environment, what is the basis for determining the lowest power received by a User Equipment (UE)/Mobile Station (MS) that meets the specified Bit Error Rate (BER) threshold?
Option 1: Searching for the highest power received across all discrete field combinations and then applying a calibration factor.
Option 2: Averaging the power received at each discrete field combination that provides a BER better than the target, after calibrating the average power transfer function.
Option 3: Measuring the power directly from the UE's antenna output without any environmental considerations.
Option 4: Using a fixed measurement antenna's reflection coefficient alone to estimate the lowest received power.
Explanation: The correct approach for determining TRS in a Rayleigh fading environment involves measuring the power at multiple discrete field combinations, filtering those that achieve a BER better than the target threshold, and then averaging these measurements. This averaged value, combined with calibration of the power transfer function (to account for system losses), yields an absolute TRS value. This method ensures accuracy by considering various environmental conditions and system factors, making Option 2 the most appropriate choice.