US 9,813,108 B2
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
Keun Hong Chae, Suwon-si (KR); and Seok Ho Yoon, Suwon-si (KR)
Assigned to Research & Business Foundation Sungkyunkwan University, Suwon-si (KR)
Filed by RESEARCH & BUSINESS FOUNDATION SUNGKYUNKWAN UNIVERSITY, Suwon-si (KR)
Filed on May 20, 2016, as Appl. No. 15/160,187.
Application 15/160,187 is a division of application No. 14/525,937, filed on Oct. 28, 2014, abandoned.
Claims priority of application No. 10-2013-0129223 (KR), filed on Oct. 29, 2013.
Prior Publication US 2016/0269073 A1, Sep. 15, 2016
This patent is subject to a terminal disclaimer.
Int. Cl. H04B 1/707 (2011.01); H04B 1/7085 (2011.01); H04B 1/7075 (2011.01); G01S 19/30 (2010.01)
CPC H04B 1/7085 (2013.01) [G01S 19/30 (2013.01); H04B 1/70752 (2013.01); H04B 2001/70706 (2013.01); H04B 2201/707 (2013.01)] 20 Claims
OG exemplary drawing
 
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+Δ/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+Δ/2) is an early signal and the B(t+τ−Δ/2) is a late signal,
generate N early partial correlation functions Sm(τ+Δ/2) (where 0≤m≤N−1) and N late partial correlation functions Sm(τ−Δ/2) by performing an auto-correlation operation on the early and late delayed received signal pair B(t+τ+Δ/2) and B(t+τ−Δ/2) with respect to a total time T(0≤t≤T),
obtain an early intermediate correlation function R0(τ+Δ/2;a) by performing an elimination operation on an early sub-correlation function pair T1(τ+Δ/2;a) and T2(τ+Δ/2;a) obtained by combining first and last early partial correlation functions S0(τ+Δ/2) and SN-1(τ+Δ/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(τ+Δ/2;a) by superposing results obtained by additionally performing an elimination operation on the early intermediate correlation function R0(τ+Δ/2;a) and each of the early partial correlation functions Sm(τ+Δ/2),
obtain a late intermediate correlation function R0(τ−Δ/2;a) by performing an elimination operation on a late sub-correlation function pair T1(τ−Δ/2;a) and T2(τ−Δ/2;a) obtained by combining first and last late partial correlation functions S0(τ−Δ/2) and SN-1(τ−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(τ−Δ/2;a) by superposing results obtained by additionally performing an elimination operation on the late intermediate correlation function R0(τ−Δ/2;a) and each of the late partial correlation functions Sm(τ−Δ/2), and
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
output 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.