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In a broadcasting system, the transmitted signal power is 50 kW, the attenuation of the signal is 155 dB (in passing from the input to the transmitting antenna to the output of the receiving antenna), and the available mean power-spectral density of the noise in the system from all sources has a mean power spectral density level 10-18 W/Hz (as if added at the receiving antenna's output). The bandwidth of the message signal m(t) is 8 KHz. Determine the output...
The receiver in a modulated system must the carrier signal to obtain the data signal. a) add. b) multiply. c) subtract. d) divide.
a. Given ?(?) = ?(? + 1) + 2?(?) − ?(? − 1) − ?(? − 2) − ?(? − 3). Plot ?(3? − 2) b. Find the energy of ?(?) = 7 ???? (5?)
Consider a DSB-LC system where the message signal is: and the modulated signal is: What is the minimum value of the constant A for which the envelope detector can be used to recover the message signal x(t) form the modulated signal xm(t) without distortion? I' stuck on this question could you please explain it? We were unable to transcribe this imageWe were unable to transcribe this image
response system 7. Consider the following signal: *(n) = sin(n + 3). (a) Is this signal periodic? If so what is its period? (b) Find its DTFS. If its DTFS is periodic, what is the period? Plot the spectrum. (C) Find its DTFT. If its DTFT is periodic, what is the period? Plot the spectrum. d) Comment on the spectrums of (b) and (c).
Problem 3 (4 points) Determine the output signal of the system below, if the input signal is xn)5+3con + 600) y(n)
Consider an FM system where the modulated signal is s(t) = 10 cos (2πfct + 2πkf∫0t m(τ)dτ)where the carrier frequency is fc = 100 MHz. The modulation signal is m(t) = 10 cos(2πfmt), where fm = 3 kHz. (a) Assuming that kf = 10, what is the approximate bandwidth of s(t)? (b) Find the instantaneous frequency fi(t) of s(t). What are the maximum and minimum values of fi(t) ?