| 摘要 |
A matched filter is provided with a plurality of taps and calculates correlations between a baseband signal and a diagnosis signal series. The matched filter derives the diagnosis signal series, based on the first through fourth preamble patterns that are candidates for a match with a preamble pattern included in the baseband signal. A hopping pattern detection unit averages the correlations output from the matched filter for each symbol. The hopping pattern detection unit generates and analyzes delay profiles so as to detect a frequency hopping pattern. A symbol timing detection unit averages the correlations output from the matched filter over the symbols. The symbol timing detection unit generates and analyzes delay profiles so as to detect symbol timing in steps.
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