3. In a QAM receiver using synchronous detection, the local oscillator produces an accurate cosine wave 2cos(x), but the two receiver branches have mismatched lengths, causing a phase delay of -1/(3+N) radians in one branch, as shown. Compute the component of the quadrature channel message appearing in the in-phase output, and compute the component of the in-phase message appearing in the quadrature output. QAM signal Low-pass filter 151(1) (1) 200001 #12 2 sin[)] Ap= Low-pass -л(3+N) filter x2(1) my(1)

7-24

D. Modi 39 In linear madulation. the intelligent signal in conveyed in A. The amplitude of the transmitled signal BA The sideband compenents of the transmitted wave C. The phase deviation modulated signal D. None of the above 40 What communication technique or modulation scheme make use of channel noise a an added advantage? A. Asynchnous shift key modulation B Vestigial sidehand modulation C Spread spectrum DA Widehand Frequency modulation Narowbund FM and AM share a lot ef similarities encept that AThe lower side frequencies ae 80 out of phase B. The upper side frequencies are 180 out of phase C. The sidehand fequencies are IH0 out of phase. D None of the sbove 41

mlt) 2 0.01 S Suppose that we are given the periodic message signal mít) shown in the figure. Assume that its bandwidth is its tenth harmonic frequency. We perform FM modulation. For which kę value can this modulation be considered as narrow-band? 80m 800T 1000T 1500T 12000T

I need to solve a question within 20 minutes as quickly as possible

an fm broadcast station operates with a peak to peak deviation of 130 khz. calculate the percentage modulation determine the peak frequency deviation and modulation index for a frequency modulator with a deviation sensitivity of 10 khz/v and modulating signal of 5cos[2pi(2500)t] when the modulating frequency in an fm system is 500 hz and the modulating voltage is 2.6 v, the modulation index is 40. find the maximum deviation.what is the modulation index when the modulating frequency is raised to 800 hz and the modulating voltage is simultaneously reduced to 1.3 V what is the modulation index of an FM transmitter whose frequency deviation is 50 kHz whiter irs audio frequency is 10 kHz what is the deviation ratio of an FM signal if the maximum allowable deviation is 12 kHz and the maximum intelligence frequency of 4 kHz

another

Amplitude modulation is the general name given to both FM and PM. True False