Consider a message signal with bandwidth 50KHZ. The amplitude of the message signal is uniformly distributed on [-2, 2]. This message signal is modulated and transmitted through a channel with 40DB attenuation and additive white noise with psd N, /2=10-12 W/Hz. If we require that the output SNR (the SNR after demodulation) be 50dB, in each of the following cases find the necessary transmitted power. DSB-SC amplitude modulation Conventional amplitude modulation with modulation index of 0.6. Phase modulation with phase deviation constant k, = 2 rad/V. Frequency modulation with modulation index of 3. а. b. с. d. Note 10log (P, / PR)= 40DB

Consider a message signal with bandwidth 50KHZ. The amplitude of the message signal is uniformly distributed on [-2, 2]. This message signal is modulated and transmitted through a channel with 40DB attenuation and additive white noise with psd N, /2=10-12 W/Hz. If we require that the output SNR (the SNR after demodulation) be 50dB, in each of the following cases find the necessary transmitted power. DSB-SC amplitude modulation Conventional amplitude modulation with modulation index of 0.6. Phase modulation with phase deviation constant k, = 2 rad/V. Frequency modulation with modulation index of 3. а. b. с. d. Note 10log (P, / PR)= 40DB

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

An SSB signal is generated by modulating a 10-MHz carrier with a 1-KHz sine tone. At the receiver, the carrier is reinserted during demodulation, but its frequency is 10.00015 MHz rather than exactly 10-MHz. How does this affect the recovered signal? How would a voice signal be affected by a carrier that is not exactly the same as the original?
Consider a cellular system operating at 900 MHz where propagation follows free space path loss with variations from log normal shadowing with σ = 6 dB. Suppose that for acceptable voice quality a signal-to-noise power ratio of 15 dB is required at the mobile. Assume the base station transmits at 1 W and its antenna has a 3 dB gain. There is no antenna gain at the mobile and the receiver noise in the bandwidth of interest is -10 dBm. Find the maximum cell size so that a mobile on the cell boundary will have acceptable voice quality 90% of the time.
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
1. Consider a continous time signal given below. The signal is digitized and carried via the link operating at the rate of 20 Kbits/sec, and each input sample is quantized into 2048 different voltage levels. x(t) = 2cos(2pi50t) + cos(2pi150t) + sin(2pi35t) a. What is the sampling frequency of the given acquisition? b. Is the sampling frequency sufficient for the given signal to avoid aliasing? If not, what are the aliased frequencies going to be? and from which original frequencies would they come from? c. Assume a bipolar 10-V A/D. What is the resulting quantizer resolution? d. What is the SNRdb of the aquired signal? PLEASE SHOW WORK I really appreciate it Thank you
1.Consider a wireless signal with a carrier frequency of fc = 1800 MHz, which is transmitted over a wireless channel that results in L= 4 multipath components at delays of 227, 463, 942, 1783 ns and corresponding to received signal amplitudes of 1, 0.8, 0.6, 0.5 respectively. Derive the expression for the received baseband signal y b (t) if the transmitted baseband signal is sb(t). Also, compute the channel coefficient h for this system for the scenario that the signals b (t) is narrowband.
A digital data will be transmitted over an analog transmission medium that has amaximum bandwidth of 1.4MHz with SNR=26.2 dB.a) What is the maximum data speed that can be achieved in this system?b) If you consider only the white noise, what is the minimum signal power required withinthis transmission system?c) How many signaling levels should be used to reach to the data rate that you calculated inpart (a)?
When the amplitude of an SSB transmitter's modulating signal is reduced to zero:Answers are as following? Which one ıs correct? a)the BFO should produce an increased frequency at its output. b)one of the two sidebands drops to zero and the other one increases to c)twice its original value due to an imbalance in the BFO. d)the receiver's output amplitude also drops to zero. the AGC responds by increasing the carrier amplitude in the receiver.
A signal transmission line which has a source impedance of 75Ω is to be connected to a signal strength meter of impedance 50Ω which has a maximum display of 18dB. Calculate the values of resistors required in an L-pad attenuator circuit to operate the meter at maximum power (towards small impedance). And also determine minimum insertion loss and minimum attenuation in dB.
What is the SNR expressed in dB for a signal detected at a receiver with a power of 1 microwatt? Assume that the power of the noise at the receiver is 1 nanowatt.
The message signal m (t) and carrier signal c (t) are defined as follows. m (t) = Cos (44πt) c (t) = Cos (1800πt) The message signal is subjected to upper sideband modulation from single sideband amplitude modulators to obtain r (t) modulated signal. Accordingly, calculate the value of the modulated signal r (t), t = 0.1 , K=r (0.1) and the Bandwidth BW and find the result of the following operation. BW / K = ?
5. Why must modulated signals be demodulated?A. To recover the original intelligenceB. To improve the spectral efficiency of digital transmissionsC. To enable implementation of advanced featuresD. To produce one or more significant sideband pairs
1. For a system with FM modulation, the amplitude of the unmodulated carrier is 12Vp, if the modulation index is 1.5 and the load resistance RL is 10 ohms,a) determine the power in the unmodulated carrier; b) Determine the power at the carrier frequency and at each significant side frequency for the modulated wave. What value of power do you obtain when adding the values obtained in question (b)?