Cooperative MIMO field measurements for military UHF band in low-rise urban environment

Experimental measurements have recently been taken in Baltimore, Maryland, to determine the channel characteristics pertaining to multiple-input multiple-output (MIMO) radio links operating in military UHF band in a low-rise urban setting. The test equipment provides a non-realtime 2 times 3 MIMO system in which the two transmit antennas can be separated by distances varying from short (sub-wavelength) to very long (on the order of city blocks). Channel capacities, computed from the measured channel transfer matrices, can then be characterized as a function of the spatial relationships among the transmit and receive antennas. Initial results are presented for selected conventional and distributed MIMO geometries.