Question: What is the primary condition for measuring False Alarm Probability in PRACH?
Option 1: When input consists solely of noise, across all channel bandwidths and frame structures.
Option 2: During transmission with a single receive antenna, in a specific frame structure.
Option 3: Only when multiple preambles are simultaneously detected.
Option 4: Exclusively for the lowest supported channel bandwidth.
Explanation: The correct answer is Option 1 because, according to PRACH specifications, the False Alarm Probability is defined as the conditional total probability of erroneously detecting a preamble when the input is only noise. This condition encompasses all scenarios regardless of the number of receive antennas and across all frame structures and channel bandwidths, ensuring the reliability of the detection process under noisy conditions.