MUTUAL COUPLING ON THE CHANNEL CAPACITY OF MIMO SYSTEMS?

Channal Capacity:

In modeling a MIMO channel, it is generally assumed that the coefficients of the channel transfer matrix are independent and identically distributed. When the antennas are placed close to one another or when there are fewer scatters in between the transmitting and the receiving arrays, the correlation coefficients will increase and hence the channel capacity will be reduced.

  Mutual coupling:

                           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 . In a network theory was used to derive the transfer matrix, which includes the coupling effects among antennas in both the transmitting and the receiving arrays, the multipath propagation channel, the receiver matching network, and the noise in the receiver amplifiers.

                               FIG:CHANNEL CAPACITY IN MIMO SYSTEMS

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EFFECT OF MUTUAL COUPLING ON THE CHANNEL CAPACITY OF MIMO SYSTEMS