Explain in our words (don't copy) Questions:1. Explain in no more than two sentences why we use a carrier signal in radio frequencytelecommunications.2. Write down mathematical equations for the Radio Frequency signal for the following communicationschemes:i) Unsuppressed Carrier Double-Sideband AMii) Suppressed Carrier Double-Sideband AM; andiii) Single Sideband AM.Explain in short sentences the meaning of the variables used in your equations.3. Sketch the frequency power spectrum for:i) Unsuppressed Carrier Double-Sideband AMii) Suppressed Carrier Double-Sideband AM; andiii) Single Sideband AM.in the special case where the message signal in a continuous sinusoidal waveform of frequency fm.

Since you have posted the multiple questions so we are supposed to answer the 1st one. 1) Since…

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Engineering

Electrical Engineering

1. Explain in no more than two sentences why we use a carrier signal in radio frequency telecommunications.

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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You have an FSK transmitter using a mark frequency of 500 kHz, a space frequency of 380 kHz, and sending 10 kbps. A) How much bandwidth do you need for your transmission? B) if you are to design the system with continuous phase shift keying in mind, what would be the value of the space frequency if the mark frequency remains the same?
A spectrum analyzer is used to measure the magnitude of a certain signal with respect to its frequency. Suppose the equipment shows a carrier at 12 dBm, with the two sidebands 8 dB below the carrier, what is the percent depth of modulation of the signal? (Blank 1)Blank 1 = ________?
a) If the carrier signal is 10V 100kHZ, the information signal is 5V 3kHZ, an AM Modulator is passed through a filter with Fr=100kHZ and Q=10, what is the sending status of the carrier lower and upper sidebands? b) Draw the AM modulator output envelope? c) Calculate the Modulation index and the sideband and total power to be sent in the transmitter according to the 50 Ohm transmitter output impedance? d) Draw the frequency spectrum? Calculate the antenna length in the transmitter?
A given FM transmitter is modulated with a single sinusoid, the output for no load power is 100W into 50Ω resistive load. Then, the frequency of the modulating signal is carefully adjusted from zero until the modulated carrier encountered its zero amplitude as observed in spectrum analyzer. Under these conditions, determine the: (Use the provided Bessel table) a. the modulation index and the number of significant sideband b. total power on its significant sidebands. c. relative total power of the carrier and each of sideband. Ans. (a) Mf =2.4, N=5; (b) 99.86 W; b Pc=0W, P1=27.04W, P2=18.49W, P3=4W, P4=0.36W, P5=0.04W
1.Select the correct statement(s) regarding the FM Index. a. Δf represents the amount of frequency that the carrier wave can change in order to represent the baseband (information/message) signal b. β=(KvcoAm)/fm is a ratio that has no units c. the larger the FM index, the greater the frequency bandwidth d. all statements are correct 2. Select the correct statement(s) regarding viewing an information signal in time and/or frequency domains. a. only the viewing a signal in the time domain is important since the transmission/carrier frequency is an assigned parameter b. observing the signal in the time domain does not give you information regarding the capacity or bandwidth of the signal c. a signal observed in the frequency domain provides information regarding signal amplitude and the periodic or non-periodic nature of the signal d. all of the above are correct 3. Select the…
A 75 MHz carrier having an amplitude of 50 V is modulated by a 3 kHz audio signal that has an amplitude of 20 V. a. Sketch the audio signal. b. Sketch the carrier. c. Construct the modulated wave. For a, b and c - label your diagram d. Determine the modulation factor. e. What frequencies would show up in a spectrum analysis of the modulated wave? f. Write trigonometric equations for the carrier and the modulating waves. Kindly answer a-f. Please have mercy. Thanks!
A signal is transmitted separately with the same carrier and modulation index, respectively 1-width, 2-frequency and 3-phase modulation. In this case, which of the following is the relationship between the transmitted signals bandwidths correct?
Two different (i.e. physically independent) band-limited analog message signals both having 5 kHz baseband bandwidth are given. A band-pass communication channel having a 10 kHz bandwidth (center frequency is 500 kHz) is available. Is it possible to transmit the given analog signals concurrently through this channel? If so, explain how it can be accomplished by deriving the related equations and also providing the spectrums. Also provide the transmitter and receiver structures with sufficient details.
In Amplitude modulation, Vestigal Side Band (VSB) is one of the technique used to overcome its limitations in terms of power and bandwidth. With this in mind; a. Explain how a VSB signal is generated in the transmitter. b. Draw and compare the frequency spectrum of the original message signal and the spectrum of the VSB signal in a frequency domain. c. Show how the bandwidth of VSB is calculated by writing the equation. d. Give one application of VSB in broadcasting.
A cellular service provider decides to use a digital TDMA scheme which can tolerate a signal- to-interference ratio of 15 dB in the worst case.i. Find the optimal value of N for the following scenarios:a) Omnidirectional antennas,b) 120° sectoring,c) 60° sectoring.ii. Should sectoring be used? If so, which case (60° or 120°) should be used? (Assume a path loss exponent of n = 4 and consider trunking efficiency.)
Type your question here An AM signal of 50 ???? power is transmitted in a frequency range 200 − 210 kHz in a transmission channel with power spectral density shown in figure. below. Calculate signal-to-noise ratio in the transmission channel.
For double sideband (DSB) signala) Write the time domain equation XDSB(t).b) Write the frequency domain equation XDSB(ω).c) Draw the block diagram for DSB signal Generation.d) Draw the receiver block diagram. e) Explain with drawing the demodulation process of double sideband (DSB) signal using coherent detector.f) What is the difficulty of synchronous demodulation (coherent detection)? g) Compare between the ordinary amplitude modulation (AM), and double sideband (DSB) modulation in terms of transmitted power, complexity of demodulation, receiver cost, and bandwidth