Cross-correlation Values for Dual-polarised Indoor MIMO Links and Realistic Antenna Elements

A MIMO indoor measurement campaign at 5.2 GHz with small dual-polarised (vertically and horizontally) patch elements was performed at the campus of TU Ilmenau, Germany, in a (mostly) NLoS corridor and hall scenario. First results from these measurements show that cross-correlation values were consistently higher in the corridor, compared to the hall. Also, an influence of the orientation of the antenna elements on the correlation values was noticed in the corridor, attributed to wave-guiding. In the hall, antenna orientation effects were less pronounced. Cross-correlation values between MIMO sub-links for the same antenna elements are under 0.75 (absolute value, between both co-polar sub-links), but generally under 0.6. The values between both cross-polarised sub-links are the lowest. Cross-correlation values between different co-polarised Rx antenna elements were higher, up to 0.88 for H-polarisation in the corridor and up to 0.75 for V-polarisation in the hall (90deg angle between elements).