Question

2) Consider the detection gain for the linear modulation systems, defined by Fig. of M. = \frac{SNR_o}{SNR_i}, where $SNR_i$ represents the input SNR before demodulation while $SNR_o$ the output SNR after demodulation. a) A coherent demodulation is assumed for the DSB-SC signal and an additive white Gaussian noise (AWGN) is introduced in the channel. Clearly explain the reason why the demodulation process provides the detection gain of 2. (Hint: use the frequency-domain concept.) b) With the same assumptions as in part (a), clearly explain the reason why the detection gain reduces to 1 for the SSB signal.

          2) Consider the detection gain for the linear modulation systems, defined by
Fig. of M. = \frac{SNR_o}{SNR_i},
where $SNR_i$ represents the input SNR before demodulation while $SNR_o$ the output SNR
after demodulation.
a) A coherent demodulation is assumed for the DSB-SC signal and an additive white
Gaussian noise (AWGN) is introduced in the channel. Clearly explain the reason why
the demodulation process provides the detection gain of 2.
(Hint: use the frequency-domain concept.)
b) With the same assumptions as in part (a), clearly explain the reason why the detection
gain reduces to 1 for the SSB signal.

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2) Consider the detection gain for the linear modulation systems, defined by
Fig. of M. = (SNRo)/(SNRi),
where SNRi represents the input SNR before demodulation while SNRo the output SNR
after demodulation.
a) A coherent demodulation is assumed for the DSB-SC signal and an additive white
Gaussian noise (AWGN) is introduced in the channel. Clearly explain the reason why
the demodulation process provides the detection gain of 2.
(Hint: use the frequency-domain concept.)
b) With the same assumptions as in part (a), clearly explain the reason why the detection
gain reduces to 1 for the SSB signal.

Added by Alexander E.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Ameer Said

03/06/2022

Step 1

This allows the receiver to multiply the received signal by a locally generated carrier signal that is synchronized with the transmitted carrier. The demodulated signal is then passed through a low-pass filter to recover the baseband signal. Show more…

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2) Consider the detection gain for the linear modulation systems, defined by SNRi, where SNR represents the input SNR before demodulation while SNRo represents the output SNR after demodulation. a) A coherent demodulation is assumed for the DSB-SC signal and an additive white Gaussian noise (AWGN) is introduced in the channel. Clearly explain the reason why the demodulation process provides the detection gain of 2. (Hint: use the frequency-domain concept.) b) With the same assumptions as in part (a), clearly explain the reason why the detection gain reduces to 1 for the SSB signal.

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