| 摘要 |
A spread spectrum (SS) pilot extraction system clips the RF carriers before the SS pilot is de-spread and the RF carriers are spread. The clipping of the RF carriers raises the noise level in the spectrum. However, the small increase in the in-band noise level is more than offset by the reduction of the in-band RF noise from spreading the clipped carriers. As a result, the reduction in the in-band noise from spreading the clipped carriers expands the detection range of the de-spread pilot. In doing so, the control circuitry can achieve further cancellation of the pilot and the IMD components. Thus, the SS pilot extraction system for feed forward RF amplifiers improves the spread spectrum pilot extraction and detection at the final output coupler to achieve improved pilot and IMD cancellation.
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