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Question 20290
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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 CommunicationHardQuestion 20290

Question

Spread spectrum communication technique (as used in CDMA) provides which key advantage over narrow-band systems?
  1. A
    Lower data rate
  2. B
    Resistance to jamming and interception; robust in multi-path fading environments
    Correct
  3. C
    Simpler transmitter design
  4. D
    Requires less spectrum

Correct answer

Resistance to jamming and interception; robust in multi-path fading environments

Explanation

Spreading a signal over a wide bandwidth lowers power spectral density (hard to detect/jam). The receiver's correlator provides processing gain = BW_spread / BW_message (e.g., 1000× = 30 dB). Also provides frequency diversity against narrow-band fading. Originally developed for military communication.

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