Multiple input multiple output measurements and modeling in Manhattan

Narrowband MIMO measurements using 16 transmitters and 16 receivers at 2.11 GHz were carried out in Manhattan (see Ling, J. et al., IEE Electronics Letters, vol.37, no.16, p.1041-2, 2001). High capacities were found for full as well as smaller array configurations, all within 80% of the fully scattering channel capacity. Correlation model parameters are derived from the data. Spatial MIMO channel capacity statistics are found to be well represented by the separate transmitter and receiver correlation matrices, with a median relative error in capacity of 3%, in contrast with the 18% median relative error observed by assuming uncorrelated antennas. A reduced parameter model (4 parameters) has been developed to represent the channel correlation matrices statistically. These correlation matrices are used to generate H matrices with capacities that are consistent within a few percent of those measured in New York. Our spatial channel model allows simulations of H matrices for arbitrary antenna configurations. These channel matrices may be used to test receiver algorithms in system performance studies. These results may also be used for antenna array design, as the decay of mobile antenna correlation with antenna separation is reported. An important finding for the base transmitter array was that the antennas were largely uncorrelated even at antenna separations as small as two wavelengths.