Ofdm Receiver, Integrated Circuit And Receiving Method

A receiver that receives an OFDM signal in which a Scattered Pilot Signal is scattered every first predetermined number of carriers arranged in a frequency axis direction, and shifted by a second predetermined number of carriers as a symbol number increases by one, the receiver comprising:

• a first division unit operable to divide each Scattered Pilot 25 Signal by a known signal, which is the same as the Scattered Pilot Signal at a time of transmission, to estimate channel characteristics of a position of each Scattered Pilot Signal;
• an interpolation unit operable to perform, in a frequency axis direction, frequency axis interpolation using the estimated channel characteristics, to interpolate channel characteristics of a signal position whose channel characteristics have not been obtained;
• and
• a second division unit operable to divide an information transmission signal, which is included in the OFDM signal, by the interpolated channel characteristics.

An integrated circuit that receives an OFDM signal in which a Scattered Pilot Signal is scattered every first predetermined number of carriers arranged in a frequency axis direction, and shifted by a second predetermined number of carriers as a symbol number increases by one, the integrated circuit comprising:

• a first division unit operable to divide each Scattered Pilot Signal by a known signal, which is the same as the Scattered Pilot Signal at a time of transmission, to estimate channel characteristics of a position of each Scattered Pilot Signal;
• an interpolation unit operable (i) to perform oblique interpolation using the estimated channel characteristics, to interpolate channel characteristics of a first signal position whose channel characteristics have not been obtained, the position of the Scattered Pilot Signal and the first signal position being on a same straight line and having different symbol numbers and different carrier numbers, and (ii) to perform, in a frequency axis direction, frequency axis interpolation using the estimated channel characteristics and the interpolated channel characteristics, to interpolate channel characteristics of a second signal position whose channel characteristics have not been obtained, and
• a second division unit operable to divide an information transmission signal, which is included in the OFDM signal, by the interpolated channel characteristics.