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Communication SystemsInformation Theory

A noiseless channel has bandwidth 3 kHz and uses 4 distinct signal levels. Its Nyquist maximum bit rate is?

  • A3 kbps
  • B6 kbps
  • C12 kbps
  • D24 kbps
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Correct Answer: C. 12 kbps
Explanation: Rb=2B log2 M=2×3000×log2(4)=6000×2=12000 bit/s=12 kbps.
Reference: Standard communication systems: information theory
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