s22_cgs

# s22_cgs - Coherent Demodulation Consider the signal y(t =...

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Coherent Demodulation Consider the signal y ( t ) = cos(2 πf c t ) u ( t ) where w ( t ) = cos(2 πf c t ) is the carrier signal, and u ( t ) is the modulating signal. The modulated signal, y ( t ) , has spectrum (Fourier transform) as shown below: Y(f) f f c -f c The signal is to be demodulated by multiplying by cos(2 πf c t ) , so that z ( t ) = cos(2 πf c t ) y ( t ) . Sketch the spectrum of z ( t ) on a 3 × 5 card.

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Coherent Demodulation Consider the signal y ( t ) = cos(2 πf c t ) u ( t ) where w ( t ) = cos(2 πf c t ) is the carrier signal, and u ( t ) is the modulating signal. The signal is to be demodulated by multiplying by cos(2 πf c t ) , so that z ( t ) = cos(2 πf c t ) y ( t ) . Sketch the spectrum of z ( t ) on a 3 × 5 card. My conﬁdence that I have the correct answer is: 1. 100% 2. 80% 3. 60% 4. 40% 5. 20% 6. 0%
Coherent Demodulation The transform of z ( t ) is given by: Y(f) f 2f c -2f c My answer 1. Was completely correct 2. Was mostly correct, with one or two minor errors 3. Had many errors 4. Was completely incorrect

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Coherent Demodulation with Phase Error Consider the signal y ( t ) = cos(2 πf c t ) u ( t ) where w ( t ) = cos(2 πf c t ) is the carrier signal, and u ( t ) is the modulating signal. The modulated signal, y ( t ) , has spectrum (Fourier transform) as shown below: Y(f) f f c -f c The signal is to be demodulated by multiplying by sin(2 πf c t ) , so that

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s22_cgs - Coherent Demodulation Consider the signal y(t =...

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