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Communication SystemsNoise & SNR

A system has signal power 100 mW and noise power 1 mW. Its SNR in decibels is?

  • A10 dB
  • B20 dB
  • C40 dB
  • D100 dB
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Correct Answer: B. 20 dB
Explanation: SNR=100/1=100. In dB, 10log10(100)=20 dB.
Reference: Standard communication systems: noise & snr
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