| 摘要 |
<p>A wireless communication apparatus (200) is arranged to detect, among a plurality of modulated carrier signals of different frequencies, at least one of the modulated carrier signals modulated with a tone burst. The wireless communication apparatus (200) comprises a receiver (230) arranged to provide a composite signal comprising the plurality of modulated carrier signals received simultaneously. An analogue-to-digital converter (240) is arranged to generate samples of the composite signal, and a block formation stage (251) is arranged to divide the samples of the composite signal into a plurality of blocks. A transform stage (252) is arranged to transform the samples of each block into frequency domain components, and a group formation stage (253) is arranged to divide the frequency domain components of each block into a plurality of groups, each group corresponding to a range of frequencies occupied by a different one of the modulated carrier signals. A tone burst detection stage (254) is arranged to perform tone burst detection on each group, and a decision stage (258) is arranged to determine which of the modulated carrier signals is modulated with the tone burst, according to which of the groups the tone burst is detected in.</p> |
