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

555 timer ic, i wanted the exact names of the components of the internal ci...

i wanted the exact names of the components of the internal circuit of a 555 timer ic

Calculate the induced voltage at full load, A 100-kW, 230-V shunt generator...

A 100-kW, 230-V shunt generator has R a = 0.05  and R f = 57.5 . If the generator operates at rated voltage, calculate the induced voltage at (a) full load, and (b) one-half fu

Slack running fit, Illustrate the conventional representations of the follo...

Illustrate the conventional representations of the following guide to the selection of Fits: (i) Slack Running Fit (ii) Loose Running Fit (iii) Easy Running Fit (iv) No

Explain position servo in a radar system, Q. Explain Position servo in a ra...

Q. Explain Position servo in a radar system? Figure depicts the essential elements of a position servo system. In a radar system, an electromagnetic pulse is radiated from an a

Compute the generator efficiency at full load, Q. A 100-kW, 230-V, dc shunt...

Q. A 100-kW, 230-V, dc shunt generator, with R a = 0.05 , and R f = 57.5  has no-load rotational loss (friction, windage, and core loss) of 1.8 kW. Compute: (a) The generato

Determine the total power in balanced delta-connected load, Q. Two wattmete...

Q. Two wattmeters are used, as shown in Figure, to measure the power absorbed by a balanced delta-connected load. Determine the total power in kW, the power factor, and the per-pha

Explain standby mode of operation in spc organization, Q. Explain Standby m...

Q. Explain Standby mode of operation in SPC organization? Standby mode of operation is the simplest of dual processor configuration operations. Generally one processor is activ

Digital controller for a steam-turbine driven generator, Q. Digital control...

Q. Digital controller for a steam-turbine driven generator? Figure illustrates the basic elements of a minicomputer system in terms of a block diagram for speed and voltage con

Static v- i characteristics, Static V- I Characteristics The  static V-...

Static V- I Characteristics The  static V- I  characteristics of power diodes is shown  in figure 1.2  when the  anode is made  positive with  respect to cathode the power  dio

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