Channel estimation apparatus and method in mobile communication system having dispersed pilot

A channel estimation method in a mobile communication system, the channel estimation method comprising:

• extracting a plurality of samples, in which a power of a sample in a time domain exceeds a first critical value, from a received pilot signal to perform channel estimation of an entire frequency band;
• setting an edge channel estimation mode;
• and
• extracting a plurality of samples, in which a power of a sample in a time domain exceeds a second critical value, from an edge of an Inverse Fast Fourier Transform (IFFT) input in the received pilot signal to perform channel estimation on the edge of the IFFT input, according to the edge channel estimation mode.

A channel estimation apparatus in a mobile communication system, the channel estimation apparatus comprising:

• an entire band channel estimation unit extracting a plurality of samples, in which a power of a sample in a time domain exceeds a first critical value, from a received pilot signal to perform channel estimation of an entire frequency band;
• an edge channel estimation unit extracting a plurality of samples, in which a power of a sample in a time domain exceeds a second critical value, from an edge of an Inverse Fast Fourier Transform (IFFT) input in the received pilot signal to perform channel estimation on the edge of the IFFT input;
• and
• a channel frequency response output unit estimating a final channel frequency response on the basis of a channel estimation result of the entire frequency band and a channel estimation result for the edge of the IFFT input.