Channel estimation method and apparatus

A channel estimation apparatus, comprising:

• a pilot extracting module, configured to extract pilot data in a received signal;
• a pilot channel estimation module, configured to perform pilot channel estimation by using the pilot data extracted by the pilot extracting module to obtain transmission coefficients of multiple groups of pilot channels;
• and
• a data channel estimation module, configured to obtain a transmission coefficient of a data channel through non-linear interpolation processing by using the transmission coefficients of the multiple groups of pilot channels obtained by the pilot channel estimation module, wherein the data channel estimation module comprises:
• a first interpolation sub-module, configured to use the obtained transmission coefficients of the pilot channels to obtain a transmission coefficient of a data channel closest to a pilot symbol through linear interpolation;
• a hard decision sub-module, configured to use the transmission coefficient of the data channel obtained by the first interpolation sub-module to perform equalization and hard decision for a corresponding received frequency domain signal on the data channel;
• a high-precision estimation sub-module, configured to use hard decision data obtained through hard decision by the hard decision sub-module and the corresponding received frequency domain signal on the data channel for channel estimation to obtain a transmission coefficient with elevated precision on the data channel;
• and
• a second interpolation sub-module, configured to use the transmission coefficient with elevated precision on the data channel obtained by the high-precision estimation sub-module to obtain transmission coefficients of other data channels closest to the data channel through linear interpolation.