Recommendation ITU-R P.1407 describes the nature of multipath propagation and defines the appropriate parameters for the statistical description of multipath effects, and provides examples of correlation effects among multiple propagation paths and their computation.
ITU-R P.1407-5-2013 history
2009ITU-R P.1407-5-2009 Multipath propagation and parameterization of its characteristics
ITU-R P.1407-5-2013 Multipath propagation and parameterization of its characteristics was changed to ITU-R P.1407-2017 Multipath propagation and parameterization of its characteristics.