Question: How are multiple uplink demodulation reference signals created for full-PRB transmission in PUSCH demodulation?
Option 1: Only by using different orthogonal sequences (OCC) on DM RS.
Option 2: By varying the amplitude of the base sequence and applying cyclic shifts.
Option 3: Based on different base sequences, different shifts of the same sequence, and different orthogonal sequences (OCC) on DM RS.
Option 4: Exclusively through the use of a common Gold sequence.
Explanation: In full-PRB transmission for PUSCH demodulation, multiple uplink demodulation reference signals are created by: (1) utilizing different base sequences, (2) applying different shifts of the same sequence for code domain multiplexing, and (3) employing different orthogonal sequences (OCC) on DM RS to enhance signal separation and reduce interference, thus increasing flexibility and capacity in uplink communications.