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Question 20299
JEE Physics · Hard

Principles of Communication: Communication System MCQ

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Communication SystemHardQuestion 20299

Question

The figure of merit of a communication system is often measured by the Eb/N0 (energy per bit to noise spectral density ratio) because:
  1. A
    It depends only on transmitter power
  2. B
    It is independent of data rate, allowing fair comparison across different rate systems
    Correct
  3. C
    It equals the SNR in dB
  4. D
    It applies only to analog systems

Correct answer

It is independent of data rate, allowing fair comparison across different rate systems

Explanation

Eb/N0 = (C/R) / (N0) where C is SNR and R is bit rate. Since bandwidth and SNR both scale with data rate, Eb/N0 normalises these out — it's the fundamental figure comparing different modulations at different rates. BPSK requires Eb/N0 ≈ 9.6 dB for 10⁻⁵ BER; QAM-64 needs ≈ 18 dB.

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