Electronics and Communication Engineering - Exam Questions Papers - Discussion

24. 

A communication channel with AWGN operating at a signal to noise ratio SNR >> 1 and bandwidth B has capacity C1. If the SNR is doubled keeping B constant, the resulting capacity C2 is given by

[A]. C2 ≈ 2C1
[B]. C2 ≈ C1 + B
[C]. C2 ≈ C1 + 2B
[D]. C2 ≈ C1 + 0.3B

Answer: Option B

Explanation:

C = B log2[1 + SNR]

C = B log2[SNR]

C' = B log2[2SNR] = B log2 SNR + B log22

C' = C1 + B.


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