For MIMO system a Please talk about the advantage and disadv

For MIMO system, (a) Please talk about the advantage and disadvantage of MIMO technique. (b) Please explain why we need Cooperative Diversity to replace MIMO in cellular network.

Solution

A)MIMO advantages
• Capacity scales linearly with number of antennas
Channel knowledge/estimation at Rx needed
• MIMO offers potential for
larger data rate
larger spectral efficiency
larger number of users
improved range/coverage
better interference suppression
better quality of service (QoS), lower bit-error rate (BER)
lower Tx power

MIMO disavantages
• Hardware complexity:
Each antenna needs a radio-frequency (RF) unit
Powerful digital signal processing (DSP) unit required
• Software complexity:
Most signal processing algorithms are computationally intensive
Power consumption:
Battery lifetime of mobile devices
Thermal problems
Antennas:
Antenna spacing (electromagnetic mutual coupling-e.g. mobile handsets)
RF interference and antenna correlation

B)

Most of the present researches on cooperative
network in which the user nodes are equipped with a single
antenna or multiple, there have been some new results which
exploit the benefits of multiple antenna deployment.
Cooperative MIMO technology allows a wireless network
system to attain better performance gains than provided by
either usual MIMO or cooperative systems. It promised
significant improvement in spectral efficiency and network
coverage phenomena for different next generation wireless
communication systems. In wireless communication, the path
towards the various techniques that gives high service quality
and data rate has been through the use of the cooperative
network provided by the rich scattering wireless channels.
Due to their great aspects, MIMO and cooperative systems
have found their way into several standards for future
wireless communication systems, especially in cellular
networks and wireless local area networks (LAN) in this
review article we are presenting the comparative analysis.