Optimal sample delay for OFDM error floor over small-delay dispersion channel

In this paper, the earlier developed error floor model for the peak performance estimation of OFDM transmission over multipath channel with small delay dispersion is enhanced by deriving a novel expression for estimating the optimal sampling delay in the power delay profile. The validity of the estimation is checked in the LTE FDD downlink environment by means of the industry-standard simulator that provided values close to the analytically predicted ones. Optimal sample time estimation can be used as a means to explore the ultimate error floor values, but the model can also be of practical use in adaptive sampling schemes.