| 摘要 |
One correlation value is selected with high accuracy from among a plurality of correlation values which have been subjected to Walsh transform. A Fast Walsh Transform (FWT) computing unit performs an FWT computation on CCK-modulated signals and outputs 64 Walsh transform values. A maximum value search unit inputs 64 Walsh transform values, and then based on the magnitude thereof it outputs a first phase correlation value signal and a first phase index signal both corresponding to one FWT value. A second phase signal derivation unit inputs the first phase index signal and outputs a second phase index signal and a second phase correlation value signal. A phase signal determining unit performs differential detection on the first phase correlation value signal and the second phase correlation value signal, respectively, for the signals which have already been outputted. The results of the differential detection are respectively compared with the phases prior to differential coding, and one having less error is selected.
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