Principles of Communication Engineering

In amplitude modulation, the total bandwidth required is
(i) fm
(ii) 2fm
(iii) fc + fm
(iv) fc - fm

In FM, the parameter varied in proportion to the message signal is
(i) Amplitude
(ii) Frequency
(iii) Phase only
(iv) Amplitude and phase

SSB modulation saves
(i) Power
(ii) Bandwidth
(iii) Both power and bandwidth
(iv) Only modulation index

VSB modulation is mainly used in
(i) AM radio
(ii) FM radio
(iii) TV video transmission
(iv) Satellite uplink

What is the main advantage of SSB over DSB?
(i) Requires less power
(ii) Better noise immunity
(iii) Requires less bandwidth
(iv) Both (i) & (ii)

A frequency-modulated (FM) signal with a frequency deviation of 75 kHz and a modulating frequency of 5 kHz has a modulation index of:
(i) 15
(ii) 50
(iii) 75
(iv) 100

Explain in detail the frequency-domain representation of signals.

Discuss Single Sideband (SSB) and Vestigial Sideband (VSB) modulation in detail.

Explain Angle Modulation with representation of FM and PM signals.

Describe the generation and detection of FM.

If an AM transmitter operates at 1000 kHz carrier frequency with a total power of 10 kW and modulation index of 0.8, determine the power in the carrier and sidebands.

A carrier signal c(t) = 10cos(2π x 10^6t) is amplitude modulated by a message signal m(t)= 5 cos(2πx10^3t). Determine the modulation index and sketch the frequency spectrum.

Compare Amplitude Modulation (AM) and Frequency Modulation (FM) in terms of bandwidth, power efficiency, and noise immunity.

Write short note on: Superheterodyne receiver