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Communication Systems

Q1: Noise with uniform power spectral density of N0ω/Hz is passed through a filter H(ω) = 2 exp (-J ω ty) followed by an ideal low pass filter of bandwidth B Hz. The output noise power in watts is

A 2 N0B

B 4 N0B

C 8 N0B

D 16 N0B

ANS:B - 4 N0B

Output spectral power density = | H(ω) | x I/P spectral power density = 2 x 2N0  4N0  Output power = 4 N0B.



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