Communications [GATE (Graduate Aptitude Test in Engineering) Electronics]: Questions 94 - 96 of 106

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Question 94

Communications
Autocorrelation and Power Spectral Density

Appeared in Year: 2021

Question

Numeric Answer▾

The autocorrelation function of a wide-sense stationary random process X (t) is shown in the figure.

The Autocorrelation Function

The average of X (t) is ________

Question 95

Communications
Entropy, Mutual Information and Channel Capacity Theorem
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Appeared in Year: 2021

Question

Numeric Answer▾

A speech signal band limited to 4 kHz, is sampled at 1.25 times the Nyquist rate. The speech samples, assumed to be statistically independent and uniformly distributed in the range -5 V to + 5 V, are subsequently quantized in an 8-bit uniform quantizer and then transmitted over a voice-grade AWGN telephone channel. If the ratio of transmitted signal power to channel noise power is 26 dB, the minimum channel bandwidth required to ensure reliable transmission of the signal with arbitrarily small probability of transmission error (rounded off to two decimal places) is ________ kHz.

Question 96

Communications
Amplitude Modulation and Demodulation
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Appeared in Year: 2021

Question

Numeric Answer▾

Consider a carrier signal which is amplitude modulated by a single-tone sinusoidal message signal with a modulation index of 50 % . If the carrier and one of the sidebands are suppressed in the modulated signal. The percentage of power saved (rounded off to one decimal place) is ________

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