Answered! A link is shared by many users. Suppose each user is active for 2 hours in a 24 hour day. i. What is the multiplexing…

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Q5 A link is shared by many users. Suppose each user is active for 2 hours in a 24 hour day. i. What is the multiplexing gain? ii. What scenarios would result in a high multiplexing gain? What scenarios would result in a low multiplexing gain? Explain you answers.

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A link is shared by many users. Suppose each user is active for 2 hours in a 24 hour day. i. What is the multiplexing gain? ii. What scenarios would result in a high multiplexing gain? What scenarios would result in a low I multiplexing gain? Explain you answers.

Expert Answer

 i ans)

before going to know what is multiplexing gain.
first we discuss about what is multiplexing.
multiplexing is nothing but combining of different signal like
–>analog signal
–>Digital signal.
these combined analog and digital signal into one common signal.to provide in common or shared medium.
the purpose of combining these signals is to share resources.
multiplexing is first developed in telegraphy.
as we know that all the calls we did is carried in same common wire..
later multiplexing is developed in wide range .
like for example multiplexing is used in communication. etc
multiplexing is transmitting signal through medium where as reverse of multiplexing is
de-multiplexing.
multiplexing is called as MUX
de-multiplexing is called as DEMUX

multiplexing gain is the full capacity of a end point to point in Multiple Input In Multiple Output at very high snr.
and Mutliple Input In Multiple Output system with transmiting anteena (ta) and reciveing antenna (ra).
minimum(ta,ra)log(snr))(1);
minimum(ta,ra) is a faction which is know as multiplexing gain.
high multiplexing gain:
in any wireless network any node will have some capacity of transmit power constraint.we could define some freedom in degree,this freedom
as high multiplexing gain.
for attain of non zero diversity gain
we can achieve high multiplexing gain by using time division multiple access..wavelength division multiple access.

the causes for low multiplexing gain is high spatial diversity.

let us take an example of a system of single destination and a source.and source and destination with single antene .virtual mimo can be mimic with physical mimo .which causes limitations..so single systems relay causees limitations so multiple destination and sources aslo gives limitations..so finally coparative relay for low multiplexing gain

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