| 摘要 |
<p>The problems of a transmitter/receiver of direct-conversion structure are solved by providing a multiband OFDM_UWB transmitter/receiver of a low-IF structure. A low-IF receiver has a structure not needing frequency conversion by a second local signal by re-arrangement such that the subcarrier is rotated after FFT and the same AD conversion clock as a direct-conversion receiver is used. For the preamble part not subjected to FFT, a sequence produced by multiplying the original preamble pattern by the IF frequency is used to enable preamble detection.</p> |
