Let m(t) denote a message signal and $$\hat m\left( t \right)$$ denote the Hilbert transform of m(t). Let the carrier frequency by ωc. Then, the single sideband (SSB) modulated signal with the upper sideband (USB) transmitted is given as
A. $$m\left( t \right)\cos \left( {{\omega _c}t} \right) - \hat m\left( t \right)\sin \left( {{\omega _c}t} \right)$$
B. $$\hat m\left( t \right)\sin \left( {{\omega _c}t} \right)$$
C. $$m\left( t \right)\cos \left( {{\omega _c}t} \right)$$
D. $$m\left( t \right)\cos \left( {{\omega _c}t} \right) + \hat m\left( t \right)\sin \left( {{\omega _c}t} \right)$$
Answer: Option A
This Question Belongs to Electronics And Communications Engineering >> Communication Systems
It is found that a ship to ship communication suffers from fading. This can be avoided by using
A. Space diversity
B. Frequency diversity
C. Broad band antenna
D. Directional antenna
A. A double-tuned amplifier
B. A high gain D.C. amplifier
C. A cathode follower stage
D. None of the above
A. Filter method
B. Phase cancellation method
C. Good attenuation characteristics
D. All of the above
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