| 摘要 |
PURPOSE:To reduce the scale of signal processing by reducing a quantity of filter arithmetic operation so as to detect a Nyquist pulse train separated into each subcarrier. CONSTITUTION:The demodulator is provided with a synchronization detection circuit 1 applying synchronization detection to a reception signal and converting the result into an in-phase component signal and a orthogonal component signal in a base band, an A/D converter 2, a memory 3 storing slot data, a subcarrier separation circuit 4, and an non-cyclic Nyquist filter circuit 5. Orthogonal detection is executed by a frequency being 1/4 of a Nyquist filter sampling frequency, the frequency of the processed signal is converted into the subcarrier frequency, and the in-phase component signal and the orthogonal component signal after subcarrier separation are processed by one filter. |
