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Method of generating binary offset carrier correlation function based on partial correlation functions, apparatus for tracking binary offset carrier signal, and spread spectrum signal receiver system using the same

  • US 9,813,108 B2
  • Filed: 05/20/2016
  • Issued: 11/07/2017
  • Est. Priority Date: 10/29/2013
  • Status: Active Grant
First Claim
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1. A delay lock loop (DLL) to track a code delay phase value for a local code to be correlated with a received BOC-modulated signal in which N pulses successively occur in a single period Tc of a spreading code chip in a spread spectrum signal receiver system, the DLL comprising:

  • a processor configured to;

    generate an early and late delayed received signal pair B(t+τ



    /2) and B(t+τ



    Δ

    /2), based on phase delay τ and

    a delay value difference Δ

    , with respect to a received signal pulse train of a received signal B(t), wherein the B(t+τ



    /2) is an early signal and the B(t+τ



    Δ

    /2) is a late signal,generate N early partial correlation functions Sm



    /2) (where 0≦

    m≦

    N−

    1) and N late partial correlation functions Sm



    Δ

    /2) by performing an auto-correlation operation on the early and late delayed received signal pair B(t+τ



    /2) and B(t+τ



    Δ

    /2) with respect to a total time T(0≦

    t≦

    T),obtain an early intermediate correlation function R0



    /2;

    a) by performing an elimination operation on an early sub-correlation function pair T1



    /2;

    a) and T2



    /2;

    a) obtained by combining first and last early partial correlation functions S0



    /2) and SN-1



    /2) based on a main peak shape parameter a such that only a main peak is left, and generate an early main correlation function Rproposed



    /2;

    a) by superposing results obtained by additionally performing an elimination operation on the early intermediate correlation function R0



    /2;

    a) and each of the early partial correlation functions Sm



    /2),obtain a late intermediate correlation function R0



    Δ

    /2;

    a) by performing an elimination operation on a late sub-correlation function pair T1



    Δ

    /2;

    a) and T2



    Δ

    /2;

    a) obtained by combining first and last late partial correlation functions S0



    Δ

    /2) and SN-1



    Δ

    /2) based on a main peak shape parameter a, such that only a main peak is left, and generate a late main correlation function Rproposed



    Δ

    /2;

    a) by superposing results obtained by additionally performing an elimination operation on the late intermediate correlation function R0



    Δ

    /2;

    a) and each of the late partial correlation functions Sm



    Δ

    /2), anddetermine a phase delay τ

    for the received signal based on a discrimination output of a discrimination function based on values of the early and late main correlation functions, andoutput the determined phase delay τ

    ,wherein the elimination operation is related to an algebraic relation in which when real numbers x and y are xy≦

    0, |x|+|y|−

    |x−

    y|=0.

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