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Code tracking loop with automatic power normalization

  • US 20060126574A1
  • Filed: 01/24/2006
  • Published: 06/15/2006
  • Est. Priority Date: 10/01/2001
  • Status: Active Grant
First Claim
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1. A user equipment (UE) for use in a code division multiple access (CDMA) communication system including at least one base station, comprising:

  • a receiver for receiving a communication signal from at least one base station; and

    a delay-locked code tracking loop (DCTL) for estimating and tracking a channel delay of said received communication signal, the DCTL comprising;

    a reference code generator for generating a reference code signal;

    an interpolator for generating a punctual output signal, an early output signal and a late output signal;

    a first timed signal correlator for correlating said early output signal with said reference code signal to generate a first correlated signal;

    a second timed signal correlator for correlating said late output signal with said reference code signal to generate a second correlated signal;

    a third timed signal correlator for correlating said punctual output signal with said reference code signal to generate a third correlated signal;

    an adder for combining the first and second correlated signals to generate a first error signal;

    an automatic power normalization (APN) loop for generating a second error signal based on said third correlated signal; and

    a normalization circuit for normalizing said first error signal by using said second error signal to generate a third error signal used for controlling the generation of the punctual output signal by the interpolator.

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