Capacity obtained from multiple-input multiple-output channel measurements in fixed wireless environments at 2.5 GHz

We present capacity, envelope correlation coefficient, and condition number statistics obtained from 2×2 multiple-input multiple-output (MIMO) fixed wireless radio channel measurements using dual-polarized antennas. To calculate the capacity, we assume that the transmitter has no knowledge about the channel. The experimental capacity results are compared to the information-theoretic channel capacity obtained from Monte Carlo simulations. Both theoretical results and experimental results show that depending on the temporal K-factor, rank of the constant matrix, envelope correlation coefficients of the variable matrix, and cross-polarization discrimination, the capacity can assume range of values for a given average SNR. The envelope correlation coefficients were found to be less than 0.42 for the 90% of cases. The condition numbers were found to be less than 10 for the majority of cases