| 摘要 |
A method and apparatus to dynamically adjust parameters of a filter for a pilot signal. An incoming signal containing a pilot signal is filtered using non-identical filters, and the magnitudes of the filtered signals are compared to estimate a bandwidth of the pilot signal. Noise in the incoming signal may also be estimated, preferably from a portion of the incoming signal not expected to contain the pilot signal. Based on the comparison of the filtered signal magnitudes, which may be compensated to remove the noise contribution, the parameters of a filter applied to the incoming signal to isolate the pilot signal are varied. The parameters may vary the bandwidth of a pilot signal filter. The non-identical filters used in the pilot signal bandwidth estimation may be IIR or FIR filters having different passbands, or may be a correlation of the incoming signal with sinusoids of different frequencies.
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