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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 20150117499A1
  • Filed: 10/28/2014
  • Published: 04/30/2015
  • Est. Priority Date: 10/29/2013
  • Status: Abandoned Application
First Claim
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1. A delay lock loop (DLL) for tracking 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 local signal generation unit configured to generate an early and late delayed received signal pair B(t+τ



    /2) and B(t+τ



    Δ

    /2), early delayed and late delayed, respectively, 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);

    early and late correlation units configured to 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 mixed signal pair B(t+τ



    /2) and B(t+τ



    Δ

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

    t≦

    T);

    an early combination unit configured to 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 given main peak shape parameter a, so that only a main peak is left, and to 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);

    a late combination unit configured to 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 given main peak shape parameter a, so that only a main peak is left, and to 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 B0



    Δ

    /2;

    a) and each of the late partial correlation functions Sm



    Δ

    /2); and

    a numerical control oscillator (NCO) configured to determine 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, and outputs the determined phase delay τ

    to the local signal generation unit;

    wherein the elimination operation is an operation 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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