Communication methods and communication devices are disclosed. The communication method, performed by a communication device, including: receiving a time-domain OFDM symbol; converting the time-domain OFDM symbol to a frequency-domain OFDM symbol containing a plurality of pilot sub-carrier received signals; extracting the plurality of pilot sub-carrier received signals from the frequency-domain OFDM symbol; estimating a plurality of first frequency-domain channel average responses (CARs) of pilot sub-carriers according to the plurality of pilot sub-carrier received signals and a plurality of pilot sub-carrier transmitted signals; determining a pilot sub-carrier number parameter for a sub-carrier block according to a statistical information of channel delay; splitting all sub-carriers into a plurality of sub-carrier blocks according to the pilot sub-carrier number parameter; and estimating second frequency-domain CARs of all sub-carriers by performing weighting average and interpolation based on the first frequency-domain CARs of the pilot sub-carriers in all sub-carrier blocks.