| 摘要 |
<p>An input complex baseband signal (x(t)) is complex multiplied by a distortion compensation coefficient (h(p)), quadrature modulated by a quadrature modulator (QMOD), and inputted to a power amplifier (AMP). A part of the output from the power amplifier (AMP) is inputted to a band-pass filter (BPF), and adjacent-channel leakage power bands are extracted by the band-pass filter (BPF). The adjacent-channel leakage power is measured by a power sensor. A distortion-compensation coefficient calculation unit (GA), which uses a genetic algorithm, calculates a distortion compensation coefficient based on the adjacent-channel leakage power or adjacent-channel leakage power ratio and the input complex baseband signal (x(t)), and outputs a distortion compensation coefficient (h(p)) as a function of power (p) of the input complex baseband signal.</p> |
