Effect of Antenna Pattern on the Capacity of the MIMO System in a Micro-Cell Environment

The correlation between different fading paths in a MIMO system is an important factor in the reduction of MIMO channel capacity. The statistical distribution of incident waves around a receiver and the pattern of a receive antenna have great effect on the correlation. We derive a condition for zero correlation to the MIMO system. Then, 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 student´s 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 higher information-theoretical capacity than the type of dipole antennas in the environment