Patent ID: 8306152

Claim:
A mobile radio communication device in which a parallel scheme whereby a pilot symbol is inserted in parallel with a data symbol is used and the maximum number of pilot symbol blocks that can be received used for one round of channel estimation calculation is fixed, comprising: pilot symbol number determination unit which determines the number of pilot symbol blocks used for channel estimation in response to phasing variation; channel estimate calculation unit which, when a channel is estimated using said determined number of pilot symbol blocks, calculates a channel estimate with said fixed maximum number of pilot symbol blocks that can be received as an initial value when the number of pilot symbol blocks more than or equal to said maximum number of pilot symbol blocks are detected, and calculates a channel estimate by using a number of detected pilot symbol blocks when the number of pilot symbol blocks less than said maximum number are detected; and storage unit which stores said channel estimate, and said number of pilot symbol blocks used for channel estimation, wherein said channel estimate calculation unit calculates a new channel estimate based on a new number of pilot symbol blocks in which a predetermined number is added to said stored number of pilot symbol blocks, said stored channels estimate, and a pilot symbol block detected this time when the maximum number of pilot symbol blocks are detected and said number of pilot symbol blocks stored in said storage unit is equal to or greater than a maximum number, and said storage unit stores the channel estimate calculated this time and the number of pilot symbol blocks used for channel estimation after overwriting said channel estimate and said number of pilot symbol blocks previously stored in said storage unit, respectively.