An OFDM-based multipath channel sounding method with fractional delays resolution

In this paper, an OFDM-based high resolution, channel sounding (CS) method is proposed under T/2-spaced sampling. The proposed CS method consists of three iterative steps. In each iteration, it attempts to catch a new path with accurate fractional delay. Besides, it is equipped with EDC criterion for path order determination. The CFR-MSE performance can be greatly improved over the conventional LS method. Besides, the proposed CS method is robust enough for different settings of EDC penalty factor a. In addition, some algorithmic refinements could be added for decreasing the complexity in the future.