| 摘要 |
PROBLEM TO BE SOLVED: To identify an orthogonal frequency division multiplex signal and a digital modulation signal or an analog modulation signal by blind processing. SOLUTION: The modulation mode identifying apparatus comprises: a correlation signal generating circuit 11 which generates a duplicate signal for correlation processing based on an unknown communication signal; an autocorrelation circuit 12 which performs autocorrelation processing through carrying out sliding processing on the duplicate signal with respect to the unknown communication signal; a detection unit (13, 14, 15, 16, 17) which detects information regarding a pilot symbol and a guide interval symbol of the communication signal based on a correlation value output obtained by the autocorrelation processing; and an identifying circuit 18 which identifies a modulation mode of the unknown communication signal based on the information regarding the pilot symbol and the guide interval symbol of the communication signal. COPYRIGHT: (C)2008,JPO&INPIT
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