Patent ID: 8432998

Claim:
A channel estimation device operable to receive a plurality of sub-carriers having different frequencies, comprising: a receiving unit operable to receive sub-carriers S 1 to S p (P being an integer), by which a spread pilot signal block is transmitted, and sub-carriers S p+1 to S 2p , by which a spread pilot signal block is transmitted, wherein spread pilot signals transmitted by each sub-carrier S i (i=1 to P) are identical to spread pilot signals transmitted by corresponding sub-carrier S p+i (i=1 to P) and spread pilot signals of a spread pilot signal block are spread and code-multiplexed in a frequency direction in the sub-carriers for transmission; a first multiplying unit operable to multiply received spread pilot signals of the sub-carriers S 1 to S 2p with a long code for despreading to generate a first multiplied result; a second multiplying unit operable to multiply the first multiplied result with a plurality of cyclically delayed spread codes and generate a plurality of second multiplied results associated with subcarriers S 1 to S 2p ; a plurality of adding units to output a plurality of added multiplied results usable to estimate channels, by multiplying a second multiplied result associated with m subcarriers (m being an integer less than 2 p ), of the plurality of second multiplied results, with a delayed second multiplied result associated with the m subcarriers, and adding n symbols (n being an integer) of the second multiplied result associated with the m subcarriers to generate an added multiplied result of the plurality of added multiplied results.