| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain an accurate channel estimate to improve accuracy of a demodulated signal by calculating the channel estimate of an optimal averaged symbol number through simple arithmetic processing for noise superimpose and random phase fluctuation on a wireless transmission line concerning a demodulator in a mobile communication device. <P>SOLUTION: Channel estimate calculation parts 1-1 (#1, #2..., #n) are provided for respectively calculating, for a symbol to be demodulated, a plurality of channel estimates 1-10 of different averaging times (channel estimation reference symbol extraction blocks) for channel estimation, a correlative value calculation part 1-13 calculates, for each of the plurality of channel estimates, correlative values between averaged channel estimates 1-11 of the first half and averaged channel estimates 1-12 of the second half, and the correlative values are compared by a comparing part 1-3. The channel estimate of the highest correlative value is selected by a selecting part 1-2, and the channel estimate is used for imparting phase rotation for channel compensation to a received symbol and for demodulating the symbol. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
