What do you mean by communication channel, Electrical Engineering

Q. What do you mean by communication channel?

The communication channel (transmissionmedium) is the physicalmediumthat is utilized to send the signal from the transmitter to the receiver. In wireless transmission, such as microwave radio, the transmission medium is usually the atmosphere or free space. Telephone channels, on the other hand, employ a variety of physical media such as wire lines and optical fiber cables. Irrespective of the type of physical medium for signal transmission, the essential feature is that the transmitted signal is corrupted in a random manner by a variety of possible mechanisms. For simplicity, the effects of these phenomena (attenuation, distortion, interference, noise, etc.) are shown at the center of Figure, since the transmission medium is often the most vulnerable part of a communication system, particularly over long distances.

2180_Signals and spectral analysis.png

Attenuation, caused by losses within the system, reduces the size or strength of the signal, whereas distortion is any alteration of the waveshape itself due to energy storage and/or non-linearities. Contamination by extraneous signals causes interference, whereas noise emanates from sources both internal and external to the system. To eliminate any one of these may pose a challenge to the design engineer.

Posted Date: 6/28/2013 5:27:55 AM | Location : United States







Related Discussions:- What do you mean by communication channel, Assignment Help, Ask Question on What do you mean by communication channel, Get Answer, Expert's Help, What do you mean by communication channel Discussions

Write discussion on What do you mean by communication channel
Your posts are moderated
Related Questions
Describe the three main sources of power dissipation in CMOS logic. Hence calculate the power dissipated in a CMOS ASIC of 40,000 gates operating at a frequency of 133MHz with a s

Apply the rule-of-thumb dc design presented in this section for a silicon npn BJT with β = 70 when the operating Q point is defined by I CQ = 15 mA and I BQ = 0.3 mA, with a dc s

Q.   Explain why equalizing connection are used in lap winding and dummy coils are some time used in wave winding. Sol.  For batteies operating in parallel, the circulating c

Consider the arrangement shown in Figure. A conductor bar of length l is free to move along a pair of conducting rails. The bar is driven by an external force at a constant velocit

applications of heterodyne wave analyzer

Q. Classify switching systems. In what way is stored program control superior to hard wired control? Ans: Classifications of switching systems are givenin block diagram belo


Points of Verification of Connection i) Phase association ii) CT polarity iii) VT polarity iv) Phase angles v)  Phase sequence vi) System conditions - unbalanc

An external resistance of 10 Ω is linked to the terminal of a battery having 10 cells connected in series. Emf for every cells and internal resistance  is 1.5V and 0.2Ω . Find the

Q. What is inter digit time? Break time is nominally 61 ms and make time is nominally 39ms. Digits are separated by idle period of 300 ms known as inter digit time. It is vital