| 摘要 |
<p>A method and apparatus for a spread spectrum matched filter (40) with Doppler correction suitable for using in a RF receiver. A waveform representing Doppler correction values is reduced into a simple Boolean combination that can simply represent the waveform and be built into the processing in the matched filter. Advantages are (i) faster use of the matched filter, resulting in faster signal acquisition, and (ii) lower power consumption because clocking to load signal and/or Doppler correction values is reduced. In particular, received samples can be Doppler corrected for the nominal or mean Doppler shift plus local oscillator error as they are stored. The remaining Doppler shift is relatively small and can be removed by building a relatively few Doppler offsets into the processing logic for each matched filter tap. The Doppler shift can be changed instantly. Doppler signals do not need to be shifted or scanned into the matched filter.</p> |
