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Wireless Mobile Communications
4G Network Architecture
Q
What is the PBCH scrambled with?
AA. Current frame number
BB. Physical cell id
CC. Ue’s crnti
DD. Not scrambled
Correct Answer:
B. B. Physical cell id
Explanation:
The PBCH is scrambled prior to modulation with a cell-specific sequence that depends on the cells’ identity. In contrast to the synchronization signals, the PBCH is transmitted on the 72 reserved subcarriers, which are QPSK-modulated.