Question

An AM modulator has output s(t) = 20 cos(300?t) + 6 cos(320?t) + 6 cos(280?t). a) Determine the modulation index. b) Determine the efficiency. c) Assume that this signal is transmitted through a channel with attenuation of 40 dB and additive white noise with power spectral density S_n(f) = N_0/2 = 10^{-10} W/Hz. What's the SNR at the output of the system assuming coherent demodulation at the receiver? d) What should the transmitter power for a DSB system be to achieve the same SNR at the output?

          An AM modulator has output s(t) = 20 cos(300?t) + 6 cos(320?t) + 6 cos(280?t).
a) Determine the modulation index.
b) Determine the efficiency.
c) Assume that this signal is transmitted through a channel with attenuation of 40 dB and additive white noise with power spectral density S_n(f) = N_0/2 = 10^{-10} W/Hz.
What's the SNR at the output of the system assuming coherent demodulation at the receiver?
d) What should the transmitter power for a DSB system be to achieve the same SNR at the output?

An AM modulator has output s(t) = 20 cos(300?t) + 6 cos(320?t) + 6 cos(280?t).
a) Determine the modulation index.
b) Determine the efficiency.
c) Assume that this signal is transmitted through a channel with attenuation of 40 dB and additive white noise with power spectral density Sn(f) = N0/2 = 10^-10 W/Hz.
What's the SNR at the output of the system assuming coherent demodulation at the receiver?
d) What should the transmitter power for a DSB system be to achieve the same SNR at the output?

Added by Barbara R.

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