An Experimental Investigation of Wideband MIMO Channel Characteristics Based on Outdoor Non-LOS Measurements at 1.8 GHz

This paper presents an experimental investigation of the wideband MIMO channel characteristics in an outdoor nonline-of-sight environment. Our wideband MIMO testbed is a true array system with four transmitting antennas and eight receiving antennas, which operates at a carrier frequency of 1.8 GHz with a bandwidth of 2.5 MHz. The measurements are conducted at the J. J. Pickle Research Campus at the University of Texas at Austin. From the measured data, the matrix channel complex impulse responses and multipath delay profiles are extracted. Statistical descriptions of the elements in the channel matrices and the frequency correlation functions are also presented. Based on the measured data, the channel capacities are computed and the Kronecker model results are evaluated for arrays of different sizes. It shows that the Kronecker model underestimates the channel capacities due to higher correlation matrices for arrays of larger sizes in outdoor environments