| 摘要 |
<p>PROBLEM TO BE SOLVED: To transmit second data in addition to first data by arranging the first data corresponding to orthogonal sub carriers on a frequency axis, preparing the second data by delaying them for prescribed time, changing the power spectrums of the respective sub carriers by a prescribed ratio, generating real number axis and imaginary number axis signals, performing orthogonal modulation and generating multiplex signals. SOLUTION: The data string conversion part 1100 of this orthogonal frequency division multiplex signal generator 1000 converts input data to parallel data strings equal to the number of the sub carriers of an orthogonal frequency division multiplex system so as to transmit them as the first data. The power of complex data composed of common mode axis and orthogonal axis data is changed corresponding to the second data in a power conversion part 1200. for the second data, the data for which the input data are delayed for predetermined time in a delay circuit 1500 are used. The plural sub carriers are synthesized to a time base waveform in an inverse discrete Fourier transformation part 1300, and carrier waves are orthogonally modulated by the real number axis and imaginary number axis signals in an orthogonal modulation part 1400.</p> |
