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EFFECT OF MUTUAL COUPLING ON THE CHANNEL CAPACITY OF MIMO SYSTEMS
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EFFECT OF MUTUAL COUPLING ON THE CHANNEL CAPACITY OF MIMO SYSTEMS

Category : Communication


Sub Category : MIMO


Project Code : ITCM04


Project Abstract

The reciprocity theorem is applied to derive an exact expression which is used to remove the coupling effects embedded in the receiving voltages of an antenna array. The correlation coefficients of the multiple-input multiple-output (MIMO) channel established with the antenna array is also modified to incorporate the direction-dependent coupling effects more accurately. The effects of mutual coupling on the channel capacity of MIMO systems in a line-of-sight as well as a multipath  environments, under different coupling assumptions, are simulated and compared.

EXISTING SYSTEM

PROPOSED SYSTEM

EXISTING CONCEPT

 

a rigorous network-theory framework for the analysis of mutual coupling in MIMO wireless communications

 

 

PROPOSED CONCEPT

 

The reciprocity theorem is applied to derive an exact expression which is used to remove the coupling effects embedded in the receiving voltages of an antenna array

 

EXISTING TECHNIQUE:

 

A detailed network model was used to develop a new mutual information expression and radiated power constraint accounting for this antenna coupling. Unlike previous analyses, this new method includes the effect of mutual coupling, and the resulting capacity expression provides a true upper bound on system performance

 

PROPOSED TECHNIQUE:

 

Capacity With Water-Filling Power Distribution Strategy

 

TECHNIQUE DEFINITION:

 

By applying an exact network theory framework to account for mutual coupling in MIMO systems. This framework includes a new power constraint that limits the actual radiated power when mutual coupling is present.

.

TECHNIQUE DEFINITION:

 

Capacity with water-filling power distribution strategy

 

DRAWBACKS

 

At smaller antenna spacings, the variation of mutual coupling among antennas will affect the channel capacity more significantly.

     It was reported that mutual coupling may increase the channel capacity by decreasing the spatial correlation coefficients under certain circumferences.

.

ADVANTAGES

 

     The water-filling strategy generally offers a higher capacity than the strategy of uniformly distributed transmitting power.

      The capacity of a MIMO channel can be increased by properly incorporating the coupling effects

 

 
 
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