| 摘要 |
PROBLEM TO BE SOLVED: To perform suitable FFT window position correction while reducing computational complexity in such a manner that symbol interference does not occur even in a propagation environment where a preceding wave is present.SOLUTION: A GI period length subtraction part 17 of an OFDM reception device 1 subtracts a signal of a GI length that is delayed for one effective symbol length, from a signal of a GI length at a correlative peak position p of a reception signal. A window position correction amount detection part 20 detects a correction amount Δp of an FFT window position by identifying a first sample point xfor which a square value yof a subtraction result is smaller than a threshold y, from a final sample point of the GI length towards a head. An FFT window position control part 21 corrects the FFT window position by shifting the FFT window position that is set based on a correlative peak position p, forwards just by the correction amount Δp. Thus, at the corrected FFT window position, neighboring symbol periods with different signal contents are not included for each of the preceding wave, a principal wave and a delay wave.SELECTED DRAWING: Figure 1 |
