US 9,319,097 B2Granted

Method for generating binary offset carrier correlation function based on local signals, apparatus for tracking binary offset carrier signal, and spread spectrum signal receiver system

AssigneeResearch & Business Foundation Sungkyunkwan University

InventorsKeun Hong Chae, Seok Ho Yoon

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Abstract

A method of generating a correlation function used to track a code phase delay value for a local code, in a spread spectrum signal receiver system, to be correlated with a received cosine or sine BOC-modulated signal, in which plurality of pulses successively occur in a single period of a spreading code chip is presented. The Method may include generating a local signal pair having a phase delay value based on a first and second local signal pair defined by first and last pulses of a signal pulse train, received during a single period of a sub-carrier of the received signal, and a given main peak shape parameter, generating a sub-correlation function pair by performing correlation operations of the received signal and the local signal pair with respect to a total time and generating a main correlation function having only a main peak by performing an elimination operation of the sub-correlation function pair.

Claims28

Dependent claims

A delay lock loop (DLL) for tracking a code phase delay value for a local code to be correlated with a received cosine or sine binary offset carrier (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 local signal pair
g
1
(
t
+
τ
+
Δ
2
;
a
)
⁢
⁢
and
⁢
⁢
g
2
(
t
+
τ
+
Δ
2
;
a
)
and a late local signal pair
g
1
(
t
+
τ
-
Δ
2
;
a
)
⁢
⁢
and
⁢
⁢
g
2
(
t
+
τ
-
Δ
2
;
a
)
each having a phase delay value τ and a delay value difference Δ based on a first and second local signal pair g1(τ;a) and g2(τ;a) defined by first and last pulses of a signal pulse train, received during a single period of a sub-carrier of the received signal, and a given main peak shape parameter a;
early and late correlation units configured to generate an early sub-correlation function pair
R
1
(
τ
+
Δ
2
;
a
)
⁢
⁢
and
⁢
⁢
R
2
(
τ
+
Δ
2
;
a
)
and a late sub-correlation function pair
R
1
(
τ
-
Δ
2
;
a
)
⁢
⁢
and
⁢
⁢
R
2
(
τ
-
Δ
2
;
a
)
by performing correlation operations of the early and late mixing signal pairs with respect to a total time T(0≦t≦T);
early and late combination units configured to generate an early main correlation function
R
proposed
⁢
(
τ
+
Δ
2
;
a
)
and a late main correlation function
R
proposed
⁢
(
τ
-
Δ
2
;
a
)
each having a main peak by performing elimination operations on the early sub-correlation function pair and the late sub-correlation function pair;
and
a numerical control oscillator (NCO) configured to determine a phase delay value τ of a first and second local signal pair for the received signal based on a filtered discrimination output, and to output the determined phase delay value τ to the local signal generation unit,
wherein the elimination operation is an operation that satisfies |x|+|y|−|x−y|=0 for real numbers x and y, and
wherein Tc, t and T comprise positive real numbers, and N comprises a positive integer.

140 more elements

A binary offset carrier (BOC) signal tracking method for tracking a code phase delay value for a local code to be correlated with a received cosine or sine 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 method comprising:

generating an early local signal pair
g
1
(
t
+
τ
+
Δ
2
;
a
)
⁢
⁢
and
⁢
⁢
g
2
(
t
+
τ
+
Δ
2
;
a
)
and a late local signal pair
g
1
(
t
+
τ
-
Δ
2
;
a
)
⁢
⁢
and
⁢
⁢
g
2
(
t
+
τ
-
Δ
2
;
a
)
each having a phase delay value τ and a delay value difference Δ based on a first and second local signal pair g1(τ;a) and g2(τ;a) defined by first and last pulses of a signal pulse train, received during a single period of a sub-carrier of the received signal, and a given main peak shape parameter a;
generating an early sub-correlation function pair
R
1
(
τ
+
Δ
2
;
a
)
⁢
⁢
and
⁢
⁢
R
2
(
τ
+
Δ
2
;
a
)
and a late sub-correlation function pair
R
1
(
τ
-
Δ
2
;
a
)
⁢
⁢
and
⁢
⁢
R
2
(
τ
-
Δ
2
;
a
)
by performing correlation operations of the early and late mixing signal pairs with respect to a total time T(0≦t≦T);
generating an early main correlation function
R
proposed
(
τ
+
Δ
2
;
a
)
and a late main correlation function
R
proposed
(
τ
-
Δ
2
;
a
)
each having a main peak by performing elimination operations on the early sub-correlation function pair and the late sub-correlation function pair;
and
determining a phase delay value τ of a first and second local signal pair for the received signal based on a filtered discrimination output, and outputting the determined phase delay value τ,
wherein the elimination operation is an operation that satisfies |x|+|y|−|x−y|=0 for real numbers x and y, and
wherein Tc, t and T comprise positive real numbers, and N comprises a positive integer.

138 more elements

A method of generating a correlation function used to track a code phase delay value for a local code to be correlated with a received cosine or sine binary offset carrier (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 apparatus, the method comprising:

generating, in the spread spectrum signal receiver apparatus, a local signal pair g1(t+τ;a) and g2(t+τ;
a) having a phase delay value τ based on a first and second local signal pair g1(τ;a) and g2(τ;a) defined by first and last pulses of a signal pulse train, received during a single period of a sub-carrier of the received signal, and a given main peak shape parameter a;
generating a sub-correlation function pair R1(τ;a) and R2(τ;a) by performing correlation operations of the received signal and the local signal pair with respect to a total time T(0≦t≦T);
and
generating a main correlation function Rproposed(τ;a) having only a main peak by performing an elimination operation of the sub-correlation function pair R1(τ;
a) and R2(τ;a),
wherein the elimination operation is an operation that satisfies |x|+|y|−|x−y|=0 for real numbers x and y, and
wherein Tc, t and T comprise positive real numbers, and N comprises a positive integer.

5 more elements

An apparatus for tracking a BOC signal, comprising:

a frequency offset compensation unit configured to output a compensated received signal compensated for frequency offset of a carrier frequency based on a carrier frequency compensation value with respect to a received signal obtained by cosine or sine binary offset carrier (BOC)-modulating predetermined data;
a local code generation unit configured to generate a delay-compensated local code based on a code phase delay value;
a mixer configured to mix the delay-compensated local code with the frequency offset-compensated received signal;
a DLL configured to repeatedly track and calculate a code phase delay value that allows a correlation value obtained by correlating the delay-compensated local signal and the frequency offset-compensated received signal with each other is located at an apex of a main peak of a correlation function, and to provide the calculated code phase delay value to the local code generation unit;
a phase lock loop (PLL) configured to repeatedly calculate a carrier frequency compensation value based on an autocorrelation value of a local code, based on the tracked code phase delay value, so that a phase error of a carrier signal can be minimized, and to provide the carrier frequency compensation value to the frequency offset compensation unit;
and
a data extraction unit configured to extract spreading data from a mixture of the delay-compensated local code and the compensated received signal;
wherein the DLL operates to:
generate a local signal pair g1(t+τ;a) and g2(t+τ;a) having a phase delay value τ based on a first and second local signal pair g1(τ;a) and g2(τ;a) defined by first and last pulses of a signal pulse train, received during a single period of a sub-carrier of the compensated received signal, and a given main peak shape parameter a;
generate a sub-correlation function pair R1(τ;a) and R2(τ;a) by performing correlation operations of the compensated received signal and the local signal pair with respect to a total time T(0≦t≦T);
generate a main correlation function Rproposed(τ;a) having only a main peak by performing an elimination operation of the sub-correlation function pair R1(τ;a) and R2(τ;a);
and
acquire and track a code phase delay value based on the generated main correlation function;
wherein the elimination operation is an operation that satisfies |x|+|y|−|x−y|=0 real numbers x and y;
wherein Tc, t and T comprise positive real numbers, and N comprises a positive integer;
and
wherein the first and second local signal pair g1(t;
a) and g2(t;a) are defined by first and last pulses ci,0(t) and ci,N−1(t) of N pulses, constituting a signal pulse train received during an i-th sub-carrier period of the received signal, and a main peak shape parameter a in accordance with the following equations:
{
g
1
⁡
(
t
;
a
)
=
∑
i
=
-
∞
∞
⁢
⁢
N
1
+
a
2
⁢
(
c
i
,
0
⁡
(
t
)
-
ac
i
,
N
-
1
⁡
(
t
)
)
,
g
2
⁡
(
t
;
a
)
=
∑
i
=
-
∞
∞
⁢
⁢
N
1
+
a
2
⁢
(
ac
i
,
0
⁡
(
t
)
-
c
i
,
N
-
1
⁡
(
t
)
)
.

106 more elements

A spread spectrum signal receiver system, comprising:

a front end unit configured to output a digital received signal obtained by cosine or sine binary offset carrier (BOC)-modulating a space wireless signal received from an antenna;
a baseband processing unit configured to acquire and track a code phase delay value for the output digital received signal using a DLL, to compensate for carrier frequency offset using a PLL, and to extract the contained data from a code delay-compensated local code and a frequency offset-compensated compensated received signal;
and
an application function processing unit configured to perform a predetermined application function based on the extracted contained data;
wherein the baseband processing unit comprises a DLL that operates to:
generate a local signal pair g1(t+τ;a) and g2(t+τ;a) having a phase delay value τ based on a first and second local signal pair g1(τ;a) and g2(τ;a) defined by first and last pulses of a signal pulse train, received during a single period of a sub-carrier of the compensated received signal, and a given main peak shape parameter a;
generate a sub-correlation function pair R1(τ;a) and R2(τ;a) by performing correlation operations of the compensated received signal and the local signal pair with respect to a total time T(0≦t≦T);
generate a main correlation function Rproposed(τ;a) having only a main peak by performing an elimination operation of the sub-correlation function pair R1(τ;a) and R2(τ;a);
and
acquire and track a code phase delay value based on the generated main correlation function;
wherein the elimination operation is an operation that satisfies |x|+|y|−|x−y|=0 for real numbers x and y;
wherein Tc, t and T comprise positive real numbers, and N comprises a positive integer;
and
wherein the first and second local signal pair g1(t;a) and g2(t;a) are defined by first and last pulses ci,0(t) and ci,N−1(t) of N pulses, constituting a signal pulse train received during an i-th sub-carrier period of the received signal, and a main peak shape parameter a in accordance with the following equations:
{
g
1
⁡
(
t
;
a
)
=
∑
i
=
-
∞
∞
⁢
⁢
N
1
+
a
2
⁢
(
c
i
,
0
⁡
(
t
)
-
ac
i
,
N
-
1
⁡
(
t
)
)
,
g
2
⁡
(
t
;
a
)
=
∑
i
=
-
∞
∞
⁢
⁢
N
1
+
a
2
⁢
(
ac
i
,
0
⁡
(
t
)
-
c
i
,
N
-
1
⁡
(
t
)
)
.

102 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/516,872Filed 17 Oct 2014
Priority: KR 10-2013-012464118 Oct 2013
Published: US 2015/0139282 A121 May 2015
Granted: 19 Apr 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H04B 1/709
Using direct sequence modulation: correlator structure
G01S 19/30
Acquisition or tracking or demodulation of signals transmitted by the system: code related
H04B 1/7085
Synchronisation aspects: using a code tracking loop, e.g. a delay-locked loop
H04B 2001/70706
Using direct sequence modulation: using a code tracking loop, e.g. a delay locked loop