| 摘要 |
<P>PROBLEM TO BE SOLVED: To highly accurately measure OFDM signals even when signal power is at a low level. <P>SOLUTION: An error detection part 14 of an OFDM wave measuring apparatus 1 performs addition of a 4-symbol unit on a time base to orthogonally demodulated baseband signals, and detects a frequency error, a symbol head position a0 and a clock error a1 by guard correlation processing. A symbol addition part 18-1 performs synchronous addition to a carrier symbol which is an FFT output signal of a symbol segmented on the basis of the symbol head position a0, and an SP pattern detection part 19 detects an SP pattern in SP correlation processing of the synchronous addition result. A clock error correction part 22 corrects the clock error a1 for the carrier symbol, a symbol addition part 18-3 synchronously adds SP signals in the carrier symbol after the correction of the clock error a1, and an SP extraction part 20-2 extracts the SP signal from the synchronous addition result. On the basis of the SP signal, the OFDM signals are measured. <P>COPYRIGHT: (C)2013,JPO&INPIT |
