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Principles of Communication: Digital Communication MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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Digital CommunicationMediumQuestion 20278

Question

In CDMA (Code Division Multiple Access), multiple users share the same frequency band by:
  1. A
    Using different time slots
  2. B
    Using different carrier frequencies
  3. C
    Using unique orthogonal codes to spread their signals
    Correct
  4. D
    Reducing power to avoid interference

Correct answer

Using unique orthogonal codes to spread their signals

Explanation

CDMA spreads each user's signal across the entire spectrum using a unique pseudo-random code. The receiver uses the same code in a correlator to extract only the desired user's signal. Used in 3G (WCDMA, CDMA2000).

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