| 摘要 |
PROBLEM TO BE SOLVED: To generate a trigger of an FFT (Fast Fourier Transform) window on the basis of a correct delay profile even under mobile environment. SOLUTION: A symbol timing adjustment circuit 43 inputs a delay profile from a matching filter 42 and an IFFT (Inverse Fast Fourier Transform) arithmetic circuit and attaches a flag to a path existing at a predetermined position from the position of a main path among paths of the delay profile supplied from the IFFT arithmetic circuit 20. Thereafter, the symbol timing adjustment circuit 43 performs an AND operation for each path, eliminates a path with no flag attached when the number of detecting times is less than a thresholdαand eliminates a path with the flag attached when the number of detecting times is less than a thresholdβ(α<β) to thereby generate a delay profile for setting an FFT window. An FFT trigger generating part 44 generates a trigger of the FFT window at timing of the first path that is reached. COPYRIGHT: (C)2007,JPO&INPIT
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