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GATE 2025 Communication Systems Evaluation Quiz 7
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Question 1
An angle modulated signal is given by s(t) = cos(4000πt) cos(5 sin200πt) + sin (4000πt) sin (5 sin200πt). The instantaneous frequency of the angle modulated signal at time t = 5 ms will be _____ kHz.
Question 2
The capacity of gaussian channel of bandwidth 5 kHz with noise PSD 10-7 W/Hz (two sided) when signal energy is 0.2 is ______× 104 bps.
Question 3
In a AM signal, received signal power is with a maximum modulating signal of 5kHz.The noise spectral density at the receiver input is .If noise power is restricted to the message signal bandwidth only then signal-to-noise ratio at the input to the receiver is_______ (dB)
Question 4
A discrete source transmits message with probabilities 0.4, 0.3, 0.3 respectively. The source is connected to the given channel. Calculate
Question 5
In a delta modulation system, message signal quantized with a step size of 0.01V, sampled at the rate of 100 samples/sec. Which of the following signal avoids slope overload distortion?
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