| 摘要 |
<p>Influences of adjacent signals are eliminated with no guard band used. A phase comparator (21) compares a window signal supplied from a frequency divider (22) with a reference window signal input to a PLL circuit (4), and provides the result of comparison for an LPF (23). The LPF (23) extracts low-frequency components from the input signal and supplies them to a voltage-controlled oscillator (24). The voltage-controlled oscillator (24) supplies an output signal to an OFDM modulator circuit (2) as a clock signal and to a frequency divider (22). The frequency divider (22) divides the input signal to generate a new window signal, which is supplied to an IFFT processor (13). The new window signal is also supplied to a PLL circuit (5), which in turn uses the supplied signal to generate a clock signal for controlling a frequency modulator circuit (3).</p> |
