| 摘要 |
PURPOSE:To reduce distortion and to improve characteristic by compensation- processing the distortion of transmission characteristic in an LPF circuit. CONSTITUTION:In an orthogonal frequency division multiplex OFDM signal generator, a data processing circuit for compensation 1 processes digital modulation data in advance based on the attenuation quantity and the delay quantity of the transmission characteristics of LPF circuits 58 and 59 for removing a turn-back signal included in an analog signal so as to distort a waveform. Consequently, the distortion of the waveform in LPF output is reduced and the transmission characteristic is compensated. Thus, distortion can be reduced without increasing the burden of the performance of a high speed Fourier transformation FFT circuit 51. |
