A Generalized Procedure for Evaluating MIMO Channel Capacity
Date Issued
2010
Date
2010
Author(s)
Lee, Ming
Abstract
In this thesis, a generalized procedure is proposed to evaluate the channel capacity of a MIMO communication system. According to the MIMO antenna pattern and the information about the radio waves, we can generate the channel matrix to obtain the channel capacity. In addition, the correlation coefficient between antenna elements can also be computed through this procedure.
Applying half-wavelength dipoles as the MIMO antenna elements, effect of AOA distributions, antenna spacings, and antenna configurations on the correlation and the channel capacity can be examined. We find that the AOA distribution is the dominant factor impacting the correlation. Though the antenna spacing is large or the orthogonal antenna configuration is used, correlation is still high with small angular spread or a strong LOS component. Besides, this thesis also focuses on mutual coupling effect. Results show that mutual coupling will lower the correlation thus increasing the capacity, however, it yields impedance mismatch which degrades the SNR. With very small antenna spacing, the amount of decreased capacity is more than the increased.
Furthermore, MIMO channel measurements were conducted in indoor environment, by which we can investigate the effect of antenna spacing on the capacity as well. From the results of data analysis, similar results are obtained thus validating the proposed procedure. Besides, polarization diversity was also studied through the channel measurement. We found that orthogonal polarization at both communication ends will benefit the capacity and diversity gain.
Subjects
Multiple-Input/multiple-Output (MIMO)
Channel Capacity
Complex Vector Pattern
Correlation Coefficient
Mutual Coupling Effect
Diversity Gain
Type
thesis
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