Six hundred voice channels, each having a bandwidth of 4 kHz, arc multiplexed using USSB subcarrier modulation and the multiplexed signal frequency modulates a carrier. The lowest SSB carrier frequency is 10 kHz and the subcarriers are spaced 4 kHz apart. Assume that each voice signal has the same average power. The channel at 10 kHz has an output signal-to-noise ratio of 60 dB. (a) If (S/N) <30 dB is not acceptable, how many channels in the system are usable? (Assume white noise at the FM receiver input.) (b) If the FDM signal phase modulates the carrier, calculate (S/N), for any channel assuming that the transmitted signal power and noise psd are the same as in the FM case.

Six hundred voice channels, each having a bandwidth of 4 kHz, arc multiplexed using USSB subcarrier modulation and the multiplexed signal frequency modulates a carrier. The lowest SSB carrier frequency is 10 kHz and the subcarriers are spaced 4 kHz apart. Assume that each voice signal has the same average power. The channel at 10 kHz has an output signal-to-noise ratio of 60 dB. (a) If (S/N) <30 dB is not acceptable, how many channels in the system are usable? (Assume white noise at the FM receiver input.) (b) If the FDM signal phase modulates the carrier, calculate (S/N), for any channel assuming that the transmitted signal power and noise psd are the same as in the FM case.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

See similar textbooks

Similar questions

a) Draw the block diagram of the phase locked loop detector that can be used to detect FM signal and explain the operation of this circuit? b) Draw clearly the block diagrams of the coherent and non-coherent detectors that can be used to demodulate AM signals? c) Sketch the block diagrams for the AM-DSB-SC and AM-SSB-SC showing clearly their spectrums that contains a carrier signal with a frequency fe and a massage signal with a frequency fm
If the carrier frequency 1000hz and reference voltage =10 V with modulation Index 0.4 and modulation frequency 8. find output voltage and frequency?
:A modulating signal is used to modulate a carrier signal(AM modulation). Let Pr , Pc, PSB, PUSB, PLSB and u are the total power, side band power, upper side band power, lower side band power and modulation index respectively. power, carrier Prove the following: a. Pc = Pr (me) m2 b. PSB = Pr m2 PLSB = 72+m2, c. PUSB = Pr 2+m2
The frequency deviation is the amount of change in carrier frequency produced by the modulating signal. Select one: O True O False
Draw the Full Duplex ASK diagram if the bandwidth is 18,000 Hz (500 to 18,500). Also find the carriers and bandwidth in both directions. Assume there is no gap between bands.
24/ b
Problem1: the figure shows multiple modulation schemes for the signal that is given by the dashed line sinusoidal function, the X-axis is the time axis is seconds and the Y-axis is the amplitude. Answer the following: 1. What is the value of the duty cycle in A? 2.What is the quantization noise in a modulator that uses a 4-bits register for the analog to digital conversion of the given sinusoidal signal?
Q7. Figure Q7 shows a modulated waveform v(t) in millivolts as a function of time t in nanoseconds. 1.5 1.0 0.5 - 0.0 -0.5 -1.0 -1.5 100 200 300 400 500 t/ns Figure Q7: Modulated waveform (a) Describe the modulation scheme. (b) What are the values of the carrier frequency and the modulation frequency? (c) What is the value of the modulation index? (d) What is the transmission efficiency (ratio of modulated to total power) in this example? (e) Sketch the spectrum of this modulated waveform indicating the relative magnitudes of the various spectral components. (f) Demodulation of this type of waveform is usually performed with an envelope detector. Describe the function of an envelope detector and sketch an example circuit. (g) What requirements on the values of the components of your envelope detector circuit are there for the successful demodulation of the given waveform? (h) Keeping the same carrier wave, the modulating wave in this example is substituted with a square wave of 50%…
B-Twenty speech signal each bandlimited to 4 kHz are FDM/SSB multiplexed, then RF modulated by a main carrier using AM modulator. Draw the block diagram and find the minimum bandwidth of multiplexing and final transmission bandwidth.
a b c please
Q2: A modulating signal is used to modulate a carrier signal(AM modulation). Let Pr, Pc, PsB, PUSB, PLSB and u are the total power, carrier power, side band power, upper side band power, lower side band power and modulation index respectively. Prove the following: a. Pc = Pr (m2) m2 b. PsB = Pr m2 PT c. PUSB = PLSB 2+m2 2+m2