| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain auto-correlation by excluding the effect of unwanted power even if the unwanted power enters a reception signal band. <P>SOLUTION: First and second filter circuits 34a, b have passing frequency characteristics different from each other, not overlapping with each other. First and second delay circuits 22a, b delay the signals from the first and second filter circuits 34a, b only by one effective OFDM symbol period. First and second complex conjugate circuits 24a, b take a complex conjugate for a delay signal. First and second complex calculation circuits 26a, b subject the signals from the first and second filter circuits 34a, b and the signals from the first and second complex conjugate circuits 24a, b to complex multiplication. First and second shift average process circuits 28a, b take an average shift by the amount of a GI length. A rate determination circuit 32 compares the maximum values of auto-correlation from the first and second shift average process circuits 28a, b with each other. A selection synthesizing circuit 30, based on the comparison result, selects an auto-correlation having a higher maximum value and outputs it as an auto-correlation output. <P>COPYRIGHT: (C)2012,JPO&INPIT |
