| 摘要 |
<p>The transmitter modulates a number of communication channels which are summed to generate a sampled sequence of the digital multicarrier signal. The sample sequence is converted into an analogue sequence via a D/A converter. The sequence is then bandpass filtered at intermediate frequency in order to select an n-th replica of the baseband spectrum of the multicarrier signal. The selection is based on the maximum distance between the replica and DC. The selected replica is then upconverted to radio-frequency, bandpass filtered, amplified and coupled to an antenna.</p> |
