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    DYNAMIC PILOT FILTER BANDWIDTH ESTIMATION
    4.
    发明专利
    DYNAMIC PILOT FILTER BANDWIDTH ESTIMATION 未知

    公开(公告)号：CA2479195A1

    公开(公告)日：2003-10-30

    申请号：CA2479195

    申请日：2002-09-13

    Applicant: QUALCOMM INC

    Inventor： PATEL SHIMMAN ,  KAN ANDREW

    IPC: H04B1/00 ,  H04B1/10 ,  H04B1/707

    Abstract: 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 compar ed to estimate a bandwidth of the pilot signal. Noise in the incoming signal ma y also be estimated, preferably from a portion of the incoming signal not expected to contain the pilot signal. Based on the comparison of the filtere d signal magnitudes, which may be compensated to remove the noise contribution , the parameters of a filter applied to the incoming signal to isolate the pil ot 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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