please answer in 15min I will give u star Q3) A DS spread-spectrum system transmits in the presence of a toneinterference using the spreading bandwidth of 1 MHz. The interference power20 dB greater than the desired signal and the required E/N, to achievesatisfactory performance is 10 dB. What is the bit rate that required to meet thespecifications?is

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Answered: Q3) A DS spread-spectrum system…

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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For an Armstrong indirect FM transmitter with the crystal carrier oscillating at 210 kHz, the crystal reference oscillating at 10.2 MHz, the sideband voltage is 0.018 V, the carrier input voltage to the combiner is 5V, the first and second multipliers are both 40, and the modulating signal frequency is 2 kHz, determine: a.) modulation index at the output of the combining network and the power amplifier; b.) frequency deviation at the same two points; and c.) the transmit carrier frequency.
Given the following FM modulator, if the modulating signal m(t) is given below:(a) Sketch the input message signal m(t).(b) Determine the FM modulated output signal yFM(t) for 0 ≤ t < 3. Given that the frequency sensitivitykf and the carrier frequency fc of the FM modulator are 5Hz/volt and 20Hz respectively.(c) What is the maximum frequency deviation (change of the carrier frequency) of the modulator?
Given the narrow (usable) audio bandwidth of a telephone transmission facility, anominal SNR of 56 dB (400,000), and a certain level of distortiona. What is the theoretical maximum channel capacity (kbps) of traditional telephonelines?b. What can we say about the actual maximum channel capacity?
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?
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
Q3 (i) What do you mean by baseband transmission of a digital signal ? What are the possible types of connection of devices in a topology for communication?
-MCQ- FM modulator is used to transmit a cosine message signal with 4V amplitude and 20Hz frequency. The frequency deviation constant kf = 25 Hz/V, the carrier is a cosine sign with an amplitude of 10V and a frequency of 2000Hz. The FM modulated signal is passed through a bandpass filter and 90% of the power of the modulated signal remains. What is the bandwidth of the FM modulated signal in this case? a) 240hz b) 20hz c) 100hz d)200hz
An FM modulator has kf=30kHz/V and operates at a carrier frequency of 180 MHza. Find the output frequency for an instantaneous value of the modulating signal equal to150mV. b. If the carrier signal is modulated by a 2Vrms sine wave. Calculate the peak frequencydeviation. c. Using the given in the previous number, also find the bandwidth using the Bessel table below for thePM signal when the message frequency is (a) doubled, (b) halved, but all else remains constant.
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.
Chose the correct answer 6- The bandwidth required for a modulated carrier depends on: a) The carrier frequency b) the signal-to-noise ratio c) the signal-plus-noise to noise ratio d) The baseband frequency range
amplitude value of output voltage (Vout) = ?? Note1 : E-MOSFET output empedance rd= 70kΩ Note2: capacitors are of negligible size at midband frequency Note3 : 5kHz in midband frequency
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.

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