| 摘要 |
<p>A signal detecting apparatus for detecting a desired OFDM modulated signal from among received signals. The signal detecting apparatus comprises an FFT part that converts received signals to first frequency domain signals of the respective carriers; a preamble pattern generating part (51) that generates second frequency domain information of the respective carriers, based on signals which include predetermined known information, have different frequencies and different initial phases and which are obtained by multiplexing signals of a plurality of carriers; complex conjugators (52) that generate complex conjugates of the second frequency domain information for the respective carriers; complex multipliers (53) that multiply the first frequency domain signals of the respective carriers by the complex conjugates of the respective carriers generated by the complex conjugators; a complex summing amplifier (54) that adds together a part or all of multiplication outputs from the multiplying means; and a signal detecting means (an absolute value calculating part (55), a carrier detecting/determining part (56)) that calculates an absolute value of an addition result or calculates a square value of the addition result and uses a predetermined threshold value to detect/determine a desired signal.</p> |
