![Problem 4 A DSB-LC signal o(t) = [A + f(t)]cos(w-t), with A=5, is the result of modulating f(t) = cos(W) + 2cos( 3mt), where](http://img.homeworklib.com/questions/bc065fe0-e9a3-11ea-b42c-056c1131fac5.png?x-oss-process=image/resize,w_560)
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![[5+ Cablwmt) +218) (36mt)] coskuct) 5 [1 + Lcos(want) +3.co2/3wnt)] colet Comparing with standard Am signal Ac [i+ Mocol (wat](http://img.homeworklib.com/questions/bcd3be90-e9a3-11ea-b495-d9cdb7c45a88.png?x-oss-process=image/resize,w_560)
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Problem 4 A DSB-LC signal o(t) = [A + f(t)]cos(w-t), with A=5, is the result of...
The input to an envelope detector is a DSB-LC signal of the form (t) = A[1...
The input to an envelope detector is a DSB-LC signal of the form (t) = A[1 + u cos 21 fmt] cos 2n fet where 0 <u < 1 and fc >> fm. If the envelope detector output is to follow the envelope of (t) at any time t, then the RC constant should satisfy the condition: 1+ u cos 21 fmt RC = 21fmu sin 21 fmt Show that for the above condition to be satisfied at all times,...
Problem A DSB-SC AM signal is modulated by the signal m(t) = cos(4000st) - cos(1000nt). The...
Problem A DSB-SC AM signal is modulated by the signal m(t) = cos(4000st) - cos(1000nt). The modulated signal is u(t) = 200 m(t) cos(21tfct), where f=1 MHz. 1. Determine and sketch the spectrum of the AM signal. 2. Determine the average power in the frequency components 3. Find a resonable choice of R and C to design an envelope detector for this DSB-SC AM signal.
5-20pts) Let s(t) be an angle-modulated signal that a receiver obtains. s(t) 2cos(10'rt +2sin(200...
5-20pts) Let s(t) be an angle-modulated signal that a receiver obtains. s(t) 2cos(10'rt +2sin(2000mt)+3sin(1000mt)] a) Find the bandwidth of this FM signal. b) If s() is sent to an (ideal) envelope detector, find the detector output signal. c) If s(t) is first differentiated before the envelope detector, find the detector output signal. d) Explain which detector output can be processed to yield the message signal m() and find the message signal m() if ky- 200π.
5-20pts) Let s(t) be an...
1. If m(t) = cos(800 mt) cos(2007) - signal to be transmitted, and c(t) = 5...
1. If m(t) = cos(800 mt) cos(2007) - signal to be transmitted, and c(t) = 5 cos(5000ft) - Carrier signal , (a) Sketch DSB-TC(f) (b) Find modulated signal bandwidth (c) Find modulation index (u), and power efficiency (n). 2. Sketch the mixer block diagram to convert di(t) to 02(t) and indicate all blocks parameters (a) 61(t) = 10 cos(200mt) cos(13000) (b) 02(t) = 10 cos(200 mt) cos(22000 nt))
The input r(t) to a DSBSC receiver is a DSB signal s(t) = A m(t)cos (21fet)...
The input r(t) to a DSBSC receiver is a DSB signal s(t) = A m(t)cos (21fet) corrupted by additive white Gaussian noise with two-sided power spectral density N,/2, where No = 10-12 W/Hz, m(t) is a message signal bandlimited to 10 kHz. Average power of m(t) is Pm = 4 W and Ac = 2 mV. The block diagram of the receiver is shown below. Note that the receiver has filters which have slightly larger bandwidths than a typical DSB...
A modulated voltage signal is given as: s(t) = 10(1 + 0.5cos(10²πt)) cos(106πt) volts.
A modulated voltage signal is given as: s(t) = 10(1 + 0.5cos(10²πt)) cos(106πt) volts. a) Plot the spectrum of the signal and calculate its bandwidth. b) Calculate the total signal power in dbm. c) If the message signal is a single-tone signal, explain if this is an AM-DSB-SC or an AM-DSB-C signal. What is the modulation efficiency? d) The signal s(t) is passed through the following system. Find the output mout(t) as a function of time and its Fourier transform, Mout(f).
Question A modulated voltage signal is given as: s(t) = 10(1 + 0.5cos(10?rt)) cos(106mt) volts. Plot...
Question A modulated voltage signal is given as: s(t) = 10(1 + 0.5cos(10?rt)) cos(106mt) volts. Plot the spectrum of the signal and calculate its bandwidth. b) Calculate the total signal power in dbm. c) If the message signal is a single-tone signal, explain if this is an AM-DSB-SC or an AM-DSB-C signal. What is the modulation efficiency? d) The signal s(t) is passed through the following system. Find the output mout(t) as a function of time and its Fourier transform,...
8 8.6-4 For a DSB-SC system with a channel noise PSD of Sn() 10-12 and a baseband signal of bandw...
8 8.6-4 For a DSB-SC system with a channel noise PSD of Sn() 10-12 and a baseband signal of bandwidth 5 kHz, the receiver output SNR is required to be at least 47 dB. The receiver is as shown in Fig. 8.30. (a) What must be the signal power Si received at the receiver input? (b) What is the receiver output noise power No? (c) What is the minimum transmitted power Sr if the channel transfer function is He)10-3 over...
[15 points] You are asked to design a DSB-SC AM modulator to generate a modulated signal km(t)cos...
[15 points] You are asked to design a DSB-SC AM modulator to generate a modulated signal km(t)cos(wt+0), where m(t) is a signal band-limited to B Hz. The following figure shows a DSB- SC AM modulator available in the stockroom. The carrier generator available generates not cos(wct), but cos (wct). Explain whether you would be able to generate the desired signal using only this equipment. You may use any kind of filter you like. 3. What kind of filter is required...
Prob. 5 (a) Consider the FM signal with modulation index B 2 is passed through an ideal band-pass...
Prob. 5 (a) Consider the FM signal with modulation index B 2 is passed through an ideal band-pass filter (BPF) with mid-band frequency f and bandwidth 5f. where f is the carrier frequency and fmis the frequency of the baseband modulating signal (i) Sketch the spectrum of the BPF output. (ii) Determine the fraction of the power of the FM signal that is present at the output of the filter (b) Consider the FM signal given by фFM (t)-100 cos...
The input to an envelope detector is a DSB-LC signal of the form (t) = A[1 + u cos 21 fmt] cos 2n fet where 0 <u < 1 and fc >> fm. If the envelope detector output is to follow the envelope of (t) at any time t, then the RC constant should satisfy the condition: 1+ u cos 21 fmt RC = 21fmu sin 21 fmt Show that for the above condition to be satisfied at all times,...
Problem A DSB-SC AM signal is modulated by the signal m(t) = cos(4000st) - cos(1000nt). The modulated signal is u(t) = 200 m(t) cos(21tfct), where f=1 MHz. 1. Determine and sketch the spectrum of the AM signal. 2. Determine the average power in the frequency components 3. Find a resonable choice of R and C to design an envelope detector for this DSB-SC AM signal.
5-20pts) Let s(t) be an angle-modulated signal that a receiver obtains. s(t) 2cos(10'rt +2sin(2000mt)+3sin(1000mt)] a) Find the bandwidth of this FM signal. b) If s() is sent to an (ideal) envelope detector, find the detector output signal. c) If s(t) is first differentiated before the envelope detector, find the detector output signal. d) Explain which detector output can be processed to yield the message signal m() and find the message signal m() if ky- 200π.
5-20pts) Let s(t) be an...
1. If m(t) = cos(800 mt) cos(2007) - signal to be transmitted, and c(t) = 5 cos(5000ft) - Carrier signal , (a) Sketch DSB-TC(f) (b) Find modulated signal bandwidth (c) Find modulation index (u), and power efficiency (n). 2. Sketch the mixer block diagram to convert di(t) to 02(t) and indicate all blocks parameters (a) 61(t) = 10 cos(200mt) cos(13000) (b) 02(t) = 10 cos(200 mt) cos(22000 nt))
The input r(t) to a DSBSC receiver is a DSB signal s(t) = A m(t)cos (21fet) corrupted by additive white Gaussian noise with two-sided power spectral density N,/2, where No = 10-12 W/Hz, m(t) is a message signal bandlimited to 10 kHz. Average power of m(t) is Pm = 4 W and Ac = 2 mV. The block diagram of the receiver is shown below. Note that the receiver has filters which have slightly larger bandwidths than a typical DSB...
Question A modulated voltage signal is given as: s(t) = 10(1 + 0.5cos(10?rt)) cos(106mt) volts. Plot the spectrum of the signal and calculate its bandwidth. b) Calculate the total signal power in dbm. c) If the message signal is a single-tone signal, explain if this is an AM-DSB-SC or an AM-DSB-C signal. What is the modulation efficiency? d) The signal s(t) is passed through the following system. Find the output mout(t) as a function of time and its Fourier transform,...
8 8.6-4 For a DSB-SC system with a channel noise PSD of Sn() 10-12 and a baseband signal of bandwidth 5 kHz, the receiver output SNR is required to be at least 47 dB. The receiver is as shown in Fig. 8.30. (a) What must be the signal power Si received at the receiver input? (b) What is the receiver output noise power No? (c) What is the minimum transmitted power Sr if the channel transfer function is He)10-3 over...
[15 points] You are asked to design a DSB-SC AM modulator to generate a modulated signal km(t)cos(wt+0), where m(t) is a signal band-limited to B Hz. The following figure shows a DSB- SC AM modulator available in the stockroom. The carrier generator available generates not cos(wct), but cos (wct). Explain whether you would be able to generate the desired signal using only this equipment. You may use any kind of filter you like. 3. What kind of filter is required...
Prob. 5 (a) Consider the FM signal with modulation index B 2 is passed through an ideal band-pass filter (BPF) with mid-band frequency f and bandwidth 5f. where f is the carrier frequency and fmis the frequency of the baseband modulating signal (i) Sketch the spectrum of the BPF output. (ii) Determine the fraction of the power of the FM signal that is present at the output of the filter (b) Consider the FM signal given by фFM (t)-100 cos...
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