| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve synchronous characteristics of reference carrier sampling clock reproduction and to improve the pull-in characteristic of an AGC circuit on an orthogonal multi-carrier signal modulation/demodulation device, especially in a demodulator. SOLUTION: The orthogonal frequency division/multiplex modulation device is provided with a reference pilot signal addition means 10A for adding a reference pilot signal to information data constituting transmission data subjected to block processing and arranging two reference pilot signals to symmetrical positions from the center frequency of a band, an addressing means 10B for converting the output of the reference pilot signal addition means 10A into one complex number data corresponding to the phase and the amplitude of a carrier and assigning it the respective carriers on a frequency axis, an IFFT means 11 to which the output of the addressing means 10B is supplied, a guide interval addition means 12 to which the output of the IFFT means 11 is supplied, a means 13 for D/A-converting the output of the addition means, and a multiplication means 15 to which the output of the means 13 and the output the reference carrier generation means are supplied to output on OFDM modulation signal.</p> |
