3. What is the signal to noise ratio, if: a) the received signal power is 0.02 m and the noise power is 500 ni? b) a 10w transmitter sends a signal that attenuates 50% by the time it arrives at the receiver and the noise level at the receiver is 700,000 ul?

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Author:Erwin Kreyszig
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8. What is the signal to noise ratio, if:
a) the received signal power is 0.02 ml and the noise power is 500 nw?
b) a 10w transmitter sends a signal that attenuates 50% by the time it
arrives at the receiver and the noise level at the receiver is 700,000 uw?
Transcribed Image Text:8. What is the signal to noise ratio, if: a) the received signal power is 0.02 ml and the noise power is 500 nw? b) a 10w transmitter sends a signal that attenuates 50% by the time it arrives at the receiver and the noise level at the receiver is 700,000 uw?
Expert Solution
Step 1

As we know that signal to noise ratio is expressed in dB.

And it is written as

(S/N)dB = 10log((signal power)/(Noise power))

(a) here, 

Signal power = 0.02 mw = 2×10-5 w

Noise power = 500 nw = 5×10-7 w

Now 

(S/N)dB = 10log((2×10-5)/(5×10-7))

             = 10log(40)

           = 16.02 dB

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