Method and system for channel estimation

A system for channel estimation, applied to a communication system having a first pilot and a second pilot, the system for channel estimation comprising:

• an extraction module, for extracting pilot signals from a received multi-path signal, wherein each pilot signal comprises the first pilot and the second pilot;
• a channel frequency-domain response estimation module, for obtaining an initially estimated channel frequency-domain response based on an estimated delay of each pilot signal and the extracted first pilot;
• a deviation estimation module, for calculating a frequency-domain response estimate of each pilot frequency in the second pilot according to the obtained initially estimated channel frequency-domain response, obtaining an actual value of each pilot frequency in the second pilot based on the extracted second pilot, and calculating a deviation between the frequency-domain response estimate and the actual value of each, pilot frequency;
• a detection module, for detecting whether an aliasing component exists in the initially estimated channel frequency-domain response;
• a positioning module, for determining a position of each aliasing component according to the deviation of each pilot frequency in the second pilot after the detection module determines that aliasing components exist;
• and
• a correction module, for correcting the initially estimated channel frequency-domain response according to the determined positions of the aliasing components, so as to obtain final channel frequency-domain estimation.