What do you mean by noise, Electrical Engineering

Assignment Help:

Q. What do you mean by Noise?

In any communication system there are usually two dominant factors that limit the performance of the system:

1. Additive noise, generated by electronic devices that are used to filter and amplify the communication signal.

2. Signal attenuation, as the signal travels through a lossy channel. A simple mathematical model of a channel with attenuation and additive noise is shown in Figure. If the transmitted signal is s(t), the received signal is given by

r(t) = αs(t) + n(t)

where α < 1, and n(t) represents an additive random noise process corrupting the transmitted signal. Physically, the additive noise may arise from electronic components and amplifiers at the receiver of the communication system, or from interference encountered in transmission as in the case of radio-signal transmission. The effect of signal attenuation is to reduce the amplitude of the desired signal s(t) and, thus, to render the information-bearing signal more vulnerable to additive noise.

991_What do you mean by Noise.png

Signal attenuation in many channels can be offset by using amplifiers to boost the signal level during transmission. However, the amplifier also introduces additive noise in the process of amplification, thereby corrupting the signal. The additional noise must also be taken into consideration in the design of the communication system.


Related Discussions:- What do you mean by noise

Give a general account of common drain amplifier, Q. Give a general account...

Q. Give a general account of common drain amplifier? The output is taken over the source terminal and when the dc supply is replaced by its short circuit equivalent, the drain

Determine the current through the coil, Solenoids find application in a var...

Solenoids find application in a variety of electrically controlled valves. The magnetic structure shown in Figure is a simplified representation of a solenoid in which the flux in

Flip flops, if JK flip flop has 1600hz frequency .then what is the input fr...

if JK flip flop has 1600hz frequency .then what is the input frequency?

Works, Microprocessor and its Applications

Microprocessor and its Applications

Calculate the open circuit voltage, This question is designed to give you ...

This question is designed to give you practice in manipulating circuit equations using j notation, and to demonstrate that techniques that you have already studied in the d.c. c

Find the minimum number of bits per byte, Q. If it is desired to store Eng...

Q. If it is desired to store English-language writing with 1 byte representing each letter, find the minimum number of bits per byte that could be used. Ans. For the 26 le

Define cables - generation and absorption of reactive power, Define Cables ...

Define Cables - Generation and Absorption of Reactive Power? It is well known that the shunt capacitance of the cable is very large as compared to that of an overhead line. Thi

Bias circuit requirements, Bias circuit requirements: Signal requirem...

Bias circuit requirements: Signal requirements for Class A amplifiers The Q-point is placed thus the transistor stays in active mode (does not shift to operation in the s

Differential amplifier to eliminate the common-mode voltage, Q. Differentia...

Q. Differential amplifier to eliminate the common-mode voltage? The transducer in some cases may have a local ground that cannot be disconnected. In such a case, a separate gro

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd