Experimental comparison of fast-fading channel interpolation methods for the LTE uplink

Due to the pilot structure, channel interpolation in the LTE uplink is a challenging problem in fast fading scenarios. In this paper different channel interpolation methods that include channel estimates from the previous and from the subsequent subframe are compared to methods using only one or two channel estimates from the actual subframe. The presented results are obtained by measurements performed on a wireless testbed that allows for reproducible measurements at velocities of up to 400 km/h.