Apparatus and method of adaptive filter

  • US 7,477,686 B2
  • Filed: 09/01/2004
  • Issued: 01/13/2009
  • Est. Priority Date: 09/01/2004
  • Status: Expired due to Fees
First Claim
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1. A method of adapting a filter for compensating deviation of actual parameter of a phase modulation unit in a polar modulation transmitter, the method comprising:

  • measuring actual parameters related to a phase modulation unit, wherein the actual parameters comprise a Voltage controlled oscillator gain (Kv), an integer frequency division ratio (N), a fractional division ratio (β

    ) and loop filter (H(S)); and

    generating the filter based on measured values of the actual parameters and stored predetermined filters coefficients for providing a compensated signal to compensate deviation of the at least one actual parameter of the phase modulation unit.

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