Zero correlation matrix of a MIMO system and its application

The correlation between different fading paths in a MIMO system plays an important role in the reduction of MIMO channel capacity. The correlation is caused by the interaction of statistical distribution of incident waves around a receiver and the pattern of receive antennas. We derive a zero correlation condition matrix to the MIMO system based on the received electric signals. To find how to approach the zero correlation condition, we study the effect of antenna pattern and antenna array configuration in a realistic micro-cell environment. In the environment, the probability density function of the angle-of-arrival of incoming waves is modeled as studentpsilas t-distribution. Two types of receive antennas under study are half-wave dipole antennas and half-wave square microstrip patch antennas. It is found that the type of patch antennas has lower correlation and thus higher information-theoretical capacity than the type of dipole antennas in the environment.