Communication device capable of channel estimation and method thereof

A communication device, providing channel estimation, comprising:

• a receiver module, configured to receive a time-domain OFDM symbol;
• a Fourier transform module, configured to convert the time-domain OFDM symbol to a frequency-domain OFDM symbol, where the frequency-domain OFDM symbol comprises a plurality of pilot sub-carrier received signals and a plurality data sub-carrier received signals;
• a pilot sub-carrier extraction module, configured to extract the plurality of pilot sub-carrier received signals from the converted frequency-domain OFDM symbol;
• a first frequency-domain channel average response estimation module, configured to estimate a plurality of first frequency-domain channel average responses corresponding to a plurality of pilot sub-carriers according to the extracted plurality of pilot sub-carrier received signals and a plurality of pilot sub-carrier transmitted signals;
• a sub-carrier block size determination module, configured to determine a pilot sub-carrier number parameter for a sub-carrier block according to a statistical information of channel delay;
• a sub-carrier block split module, configured to split all of the sub-carriers into a plurality of sub-carrier blocks according to the pilot sub-carrier number parameter;
• and
• a second frequency-domain channel average response estimation module, configured to estimate second frequency-domain channel average responses of all sub-carriers in the frequency-domain OFDM symbol according to first frequency-domain channel average responses of the pilot sub-carriers in all sub-carrier blocks.