Question: What is implied when two antenna ports in a 5G New Radio (NR) system are considered quasi co-located in terms of channel properties?
Option 1: They share identical small-scale fading characteristics.
Option 2: The large-scale properties of one can be inferred from the other, including delay spread and average gain.
Option 3: They must transmit the same symbol sequences simultaneously for channel estimation.
Option 4: Quasi co-location only applies to antenna ports serving the same User Equipment (UE).
Explanation: In the context of 5G NR, quasi co-located antenna ports imply that the large-scale properties of the radio channel (such as delay spread, Doppler spread, Doppler shift, average gain, average delay, and spatial Rx parameters) experienced by one antenna port can be reliably inferred from those of another. This is crucial for efficient channel estimation and beamforming strategies in multi-antenna systems, ensuring effective communication without needing each port to independently estimate all channel aspects.