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

Explain pentium processor has a superscalar architecture, 'Pentium processo...

'Pentium processor has a superscalar architecture'. Explain the meaning of the statement. The Pentium microprocessor is organized along with three execution units. Single execu

Determine ripple factor of half wave rectifier, Illustrate VI Characteristi...

Illustrate VI Characteristics of PN junction diode (10) Illustrate Half Wave Rectifier. Disadvantage of Half Wave Rectifier. Determine ripple factor of Half Wave Rectifier.

Fault analysis, The one line diagram of a simple three phase power system i...

The one line diagram of a simple three phase power system is shown in figure below. Each generator is represented by an emf behind the transient reactance. All impedances are expre

The octal inverter 74ls 240, The  Octal Inverter 74LS 240 It is  simil...

The  Octal Inverter 74LS 240 It is  similar  to above  octal  buffer  but with  inverter output. The  logic  diagram is  shown  in figure below . Normal 0

Magnetic circuits, a cast steel has minimun diameter of 200 mm and a cross...

a cast steel has minimun diameter of 200 mm and a cross sectional area of 250/1000000 m . calclate the mmf to produce a flux of300/1000000 Wb.

Series connected motor, In this case, the armature is connected in series w...

In this case, the armature is connected in series with the field coils. Thus I a   = I f = I         NB. At starting, the back emf is zero (because the m

Stator current control methods - motor control , Stator  Current Control ...

Stator  Current Control Methods The torque  and speed  of an induction motor  can be  controlled  by the  stator  current  the motor  behaviour  is different from that with VS

Voltage quadrupler, Voltage Quadrupler : A voltage quadrupler circuit is s...

Voltage Quadrupler : A voltage quadrupler circuit is shown in fig. which provides output voltage V0 = 4 Vm. Operation : Capacitor C 1 , C 2 and C 3 charges to Vm, 2Vm and 2Vm

Electric current, Electric current   Electric current is a flow ...

Electric current   Electric current is a flow of electrons. Each electron carries a very small amount of negative charge (1.6 x 10 -19 coulombs)   A current

Voltage divider, I want to know how can i make transformerlass power supply...

I want to know how can i make transformerlass power supply 220v to 48v (8A) and 220v to 24v (8A)

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