(1) A baseband PAM communication channel bandwidth is 100 KHz and has a noise power spectral densityof 10^-9 W/Hz. The channel loss between the transmitter and receiver is 25dB. The application requires abit rate of 500 Kbps and BER of less than 10^-5. The system uses raised cosine pulses with a roll-off factorof 0.25. Determine the minimum transmit power required.(2) Continuing problem 1. Everything for the previous problem stays the same BUT the best PowerAmplifier you can afford has a maximum output power of 10 Watts. What will be estimated BER for thesystem?

Answered: Image /qna-images/answer/3e7b1acb-bf26-41da-92b7-5e5f66ad48ce.jpg

Answered: (1) A baseband PAM communication…

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...

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41. Noise is typically narrow spikes of voltage with high frequencies.Group of answer choices True False 42. SCA signal can be transmitted at 67-kHz subcarrier.Group of answer choices True False 43. In FM, as the modulating signal amplitude increases, carrier frequency also increases proportionately.Group of answer choices True False 44. The greater the amplitude of the modulating signal, the higher the frequency deviation rate.Group of answer choices True False 45. With no modulation, the carrier frequency will shift above or below its normal frequency.Group of answer choices True False 46. The higher the frequency of the modulating signal, the greater the frequency deviation of the carrier signal.Group of answer choices True False
3. In an FM signal that modulating frequency is a 1.5-kHz sine wave. The carrier frequency is 1000 kHz. The frequencies of the third significant sidebands are ___ and ___ kHz.
q4- In spread spectrum communications, a pseudo-noise (PN) sequence converts _______ signal to ______ signalSelect one option: a. unmodulated, modulated b. narrowband, wideband c. none of other answers d. wideband, narrowband
19. The _____________ gives a visual indication of system linearity and noise performance.A. spread spectrumB. pseudonoiseC. spectral regrowthD. constellation pattern
B. DSBSC modulated signal is transmitted over a noisy channel, with the power spectral density of noise being as shown in Figure 1. The Costas receiver shown in figure 2 is used to recover the signal. (Assume: () phase shift is constant value arrange between zero to 90 degree) 1. Derive the demodulated signal at upper and lower sides 2. Determine the maximum power of the demodulated signal at upper side 3. Determine the signal to noise ratio for the demodulated signal at upper side lehanel Podut modulator Los fite Denodlatad Vitage controlled Oll Pra phase-shiter Pudiet meduletar Loepes Figure 1 Figure 2
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%…
Problem 1: The message signal as below is used to angle modulate a carrier c(t) = 100cos4000лt. (a) (b) (c) (d) Determine the peak-frequency deviation with k=2 using FM. Determine the peak-phase deviation with k=1 using PM. If k=kp=5, determine the maximum instantaneous frequency in FM and PM respectively. Determine the phase o(t) of the FM modulated signal with k+=2. m(t) 3 0 2 4 6 t -3
A 162-MHz carrier is deviated by 12 kHz by a 2-kHz modulating signal. What is the modulation index?
One disadvantage of the standard AM is that the transmitted power is wasted because it is mostly at the carrier. True False The bandwidth of a standard AM is twice the frequency of the modulating signal. O True False The phasing method is used for SSBSC. True False
Q6. Figure Q6 shows the line spectrum of a modulated signal (all components are positive and real). 3 1 232 234 236 238 frequency/kHz Figure Q6: Line spectrum of a modulated signal (a) Describe the modulation scheme. (b) What are the values of the carrier frequency, modulation frequency and the modulation index? (c) What is the transmission efficiency (ratio of modulated to total power) in this example? (d) The reception of this signal is undertaken with a superheterodyne detector using an intermediate frequency of 110 kHz. What is the appropriate local oscillator frequency? (e) Demodulation of this type of signal is usually accomplished using an envelope detector. Describe the principles of operation of an envelope detector and sketch an example circuit. (f) What considerations should be made about the component values in the design of an envelope detector in order to demodulate the signal after shifting to the intermediate frequency? Relative unitsS
A 93.2 MHz carrier is frequency modulated by a 5-KHz sine wave. The resultant FM signal has a frequency deviation of 40 KHz. (a) Find the carrier swing of the FM signal. (b) Determine the highest and lowest frequencies attained by the modulated signal. (c) What is the modulation index of the FM wave (d) Calculate the percent modulation? (e) Determine the bandwidth using approximation method.
Problem 6. Text Problem 2.3 (revised). Suppose for a certain FM system the demodulated SNR is 34 dB with a receiver threshold of 16 dB. The baseband signal has a 5 kHz bandwidth. The noise density level is No -110 dBW/Hz. =- a. Determine the FM index, 3. b. What RF bandwidth is needed for transmission for this system. c. Find the required received carrier power level.

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