Question: For DM-RS associated with a PSBCH, under what conditions can the channel of a PSBCH symbol on one antenna port be inferred from the channel of a DM-RS symbol on the same antenna port?
Option 1: If the two symbols are within the same frequency resource as the scheduled PSSCH and in the same slot.
Option 2: If the two symbols are within a S-SS/PSBCH block transmitted within the same slot, and with the same block index.
Option 3: If the PSBCH symbol is transmitted on antenna ports starting with 1000.
Option 4: If the DM-RS symbol is associated with a PSCCH in the same frequency resource.
Explanation: This is correct because, according to sidelink specifications, inferring the channel for a PSBCH symbol from its associated DM-RS symbol on the same antenna port requires both symbols to be within the same S-SS/PSBCH block, transmitted in the same slot, and sharing the same block index, ensuring accurate channel estimation for PSBCH reception.