Question: For a UE (User Equipment) undergoing the SDU (Service Data Unit) error rate test in a 7.68 Mcps TDD (Time Division Duplex) setup, what is a prerequisite for the receiver antenna connectors if the UE has more than one?
Option 1: The fading of the signals and AWGN (Additive White Gaussian Noise) signals must be correlated across all connectors.
Option 2: Each connector must support a different frequency band within the TDD spectrum.
Option 3: The fading of the signals and AWGN signals applied to each receiver antenna connector shall be uncorrelated.
Option 4: All connectors must have identical receive characteristics for SDU error rate determination.
Explanation: In a multi-antenna setup, ensuring that the fading and noise (AWGN) are uncorrelated between antennas is crucial for accurately testing the UE's performance under diverse signal conditions. This setup mimics real-world scenarios where signals received by different antennas undergo independent fading and noise effects, thus requiring the UE to effectively manage these variations for reliable communication. This prerequisite specifically targets the enhancement of diversity gain in receivers, a key aspect of wireless communications, especially in TDD systems.