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Which risk increases when channel estimation exhibits imperfect synchronization in OFDM?

A)Intersymbol interference dominates strongly
B)Subcarrier orthogonality is substantially degraded
C)Increased transmit energy is utilized
D)Guard interval duration becomes insufficient

💡 Explanation

Imperfect synchronization causes phase and frequency offsets. This affects the **loss of orthogonality** on each subcarrier because the cyclic prefix cannot compensate for the altered timing; therefore, inter-carrier interference increases, rather than affecting power needed/guard intervals/or timing alone.

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