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Which technology allows multiple users to share the same frequency band by assigning unique codes?
- FDMA
- TDMA
- CDMA
- OFDMA
Answer: CDMA
CDMA (Code Division Multiple Access) allows multiple users to transmit simultaneously on same frequency by assigning unique spreading codes. Used in 3G networks. FDMA divides frequency, TDMA divides time slots, OFDMA (used in 4G/5G) combines frequency and time division with orthogonal subcarriers.