Bounds on the systematic measurement errors of channel sounders for time-varying mobile radio channels

We show that correlative sounders for time-varying mobile radio channels are affected by various systematic measurement errors. We identify and analyze these errors and provide quantitative error bounds in terms of channel and sounder parameters. Furthermore, we propose a novel calibration method yielding substantially improved accuracy. Experiments using measured data and computer simulations illustrate the theoretical results. The findings allow to assess the accuracy of existing measurements as well as to devise improved measurement techniques