Interpolation of channel impulse responses combining the Brownian bridge with a modified birth and death process

This paper presents an algorithm to interpolate two channel impulse responses in order to recreate temporal and spatial correlations and a continuous fading profile. The algorithm is used in a radio link simulator for `Programme Making and Special Event' applications to compute changes in channel impulse responses caused by large scale motions. This is achieved by means of a Brownian bridge combined with a modified birth and death process. At this, the Brownian bridge is used to compute the number of multipath components between two channel impulse responses. The birth and death process computes the appearing and disappearing points of the single multipath components in the second step. Also simulations with a ray-tracing model of the reference scenario are done, to get the basic parameters for the used distribution and to check the applicability.