Polarization in Spatial Channel Models at mm-Waves: a Correlation Based Approach

Polarization diversity at mm-waves is under consideration for the new 3GPP release. Since mm-waves systems have higher resolution in the time and angular domain, more accurate intra-cluster models are needed, in which path properties as polarization becomes more deterministic. In the present paper we discuss the limitations of the current modelling of the polarimetric matrix in spatial channel models (SCMs) and we propose a new modelling approach including correlation between the different coefficients through the cross-polarization ratios (XPRs) and co-polarization ratios (CPRs). Since path-level information is necessary for this analysis, and due to the lack of high resolution parameter estimation (HRPE) at mm-waves, we have performed 60 GHz cluster level measurements to validate ray-tracing simulations that were later used to derive the model parameters.