Subject Revision:Analog Communication Quiz

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Question 1

Weak components of a signal with non-flat psd can be protected against channel noise and frequency dependent channel response by a pair of spectral operations. These components can be amplified before transmission and attenuated after reception leading to both flat end-to-end channel response and higher SNR. What are the names of these operations

• Acompression-expansion
• Bemphasize-deemphasize
• Cchannel equalization
• Damplify-attenuate

Question 2

What would be the bandwidth of the output signal of SSB-AM (USB) modulator illustrated below when the bandwidth of the baseband message signal is 3 kHz and c(t) = 2sin(200 * 10³ πt).

• A1 KHz
• B3 KHz
• C10 KHz
• D9 KHz

Question 3

A device with input x(t) and output y(t) is characterized by: y(t) = x²(t). An FM signal with frequency deviation of 90 kHz and modulating signal bandwidth of 5 kHz is applied to this device. The bandwidth of the output signal is

• A370 kHz
• B190 kHz
• C380 kHz
• D95 kHz

Question 4

The AM signal gets added to a noise with Power Spectral Density S_n(f) given in the figure below. The ratio of average sideband power to mean noise power would be:

• A
• B
• C
• D

Question 5

The signal m(t) as shown is applied both to a phase modulator (with kp as the phase constant) and a frequency modulator (with kf as the frequency constant) having the same earner frequency.

The ratio kp/kf (in rad/Hz) for the same maximum phase deviation is

• A8π
• B4π
• C2π
• Dπ

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