Transmission method, transmission device, reception method, and reception device
View Patent ↗Provided is a transmission method that improves data reception quality in radio transmission using a single-carrier scheme and/or a multi-carrier scheme. The transmission method includes: generating a plurality of first modulated signals and a plurality of second modulated signals from transmission data, the plurality of first modulated signals being signals generated using a 16 QAM modulation scheme, and the plurality of second modulated signals being signals generated using uniform constellation 64 QAM modulation; generating, from the plurality of first modulated signals and the plurality of second modulated signals, a plurality of first signal-processed signals and a plurality of second signal-processed signals which satisfy a predetermined equation; and changing the predetermined equation when a 64 QAM modulation used to generate the plurality of second modulated signals is switched from the uniform constellation 64 QAM modulation to a non-uniform constellation 64 QAM modulation.
1. A transmission method, comprising:
generating a plurality of first modulated signals s 1 (i) and a plurality of second modulated signals s 2 (i) from transmission data, where i is a symbol number that is an integer greater than or equal to 0, the plurality of first modulated signals s 1 (i) being signals generated using a 16 quadrature amplitude modulation (QAM) modulation scheme, and the plurality of second modulated signals s 2 (i) being signals generated using uniform constellation 64 QAM modulation;
generating, from the plurality of first modulated signals s 1 (i) and the plurality of second modulated signals s 2 (i), a plurality of first signal-processed signals z 1 (i) and a plurality of second signal-processed signals z 2 (i) which satisfy an Equation (1), wherein the Equation (1) is defined as:
(
z
1
(
i
)
z
2
(
i
)
)
=
F
(
u
0
0
v
)
(
s
1
(
i
)
s
2
(
i
)
)
,
wherein an Equation (2) is defined as:
u
=
α
×
2
5
,
wherein
an
Equation
(
3
)
is
defined
as
:
v
=
α
×
3
5
,
wherein
an
Equation
(
4
)
is
defined
as
:
F
=
(
β
×
cos
π
4
-
β
×
sin
π
4
β
×
sin
π
4
β
×
cos
π
4
)
,
α and β are arbitrary real numbers or imaginary numbers;
transmitting the plurality of first signal-processed signals z 1 (i) and the plurality of second signal-processed signals z 2 (i) using a plurality of antennas, wherein among the plurality of first signal-processed signals z 1 (i) and the plurality of second signal-processed signals z 2 (i), a first signal-processed signal and a second signal-processed signal that have identical symbol numbers are simultaneously transmitted at the same frequency; and
changing a value of coefficient u expressed by Equation (2) and a value of coefficient v expressed by Equation (3) when a 64 QAM modulation used to generate the plurality of second modulated signals s 2 (i) is switched from the uniform constellation 64 QAM modulation to a non-uniform constellation 64 QAM modulation.
2. A transmission device, comprising:
a mapper that generates a plurality of first modulated signals s 1 (i) and a plurality of second modulated signals s 2 (i) from transmission data, where i is a symbol number that is an integer greater than or equal to 0, the plurality of first modulated signals s 1 (i) being signals generated using a 16 quadrature amplitude modulation (QAM) modulation scheme, and the plurality of second modulated signals s 2 (i) being signals generated using uniform constellation 64 QAM modulation;
a signal processor that generates, from the plurality of first modulated signals s 1 (i) and the plurality of second modulated signals s 2 (i), a plurality of first signal-processed signals z 1 (i) and a plurality of second signal-processed signals z 2 (i) which satisfy an Equation (1), wherein the Equation (1) is defined as:
(
z
1
(
i
)
z
2
(
i
)
)
=
F
(
u
0
0
v
)
(
s
1
(
i
)
s
2
(
i
)
)
,
wherein an Equation (2) is defined as:
u
=
α
×
2
5
,
wherein
an
Equation
(
3
)
is
defined
as
:
v
=
α
×
3
5
,
wherein
an
Equation
(
4
)
is
defined
as
:
F
=
(
β
×
cos
π
4
-
β
×
sin
π
4
β
×
sin
π
4
β
×
cos
π
4
)
,
αand βare arbitrary real numbers or imaginary numbers; and
a transmitter that transmits the plurality of first signal-processed signals z 1 (i) and the plurality of second signal-processed signals z 2 (i) using a plurality of antennas, wherein among the plurality of first signal-processed signals z 1 (i) and the plurality of second signal-processed signals z 2 (i), a first signal-processed signal and a second signal-processed signal that have identical symbol numbers are simultaneously transmitted at the same frequency,
wherein the signal processor changes a value of coefficient u expressed by Equation (2) and a value of coefficient v expressed by Equation (3) when a 64 Q AM modulation used to generate the plurality of second modulated signals s 2 (i) is switched from the uniform constellation 64 QAM modulation to a non-uniform constellation 64 QAM modulation.
3. A reception method, comprising:
obtaining reception signals by receiving a first transmission signal and a second transmission signal transmitted from different antennas,
wherein the first transmission signal and the second transmission signal are signals resulting from transmitting a plurality of first signal-processed signals z 1 (i) and a plurality of second signal-processed signals z 2 (i) using a plurality of antennas, where i is a symbol number that is an integer greater than or equal to 0, and among the plurality of first signal-processed signals z 1 (i) and the plurality of second signal-processed signals z 2 (i), a first signal-processed signal and a second signal-processed signal that have identical symbol numbers are simultaneously transmitted at the same frequency,
the plurality of first signal-processed signals z 1 (i) and the plurality of second signal-processed signals z 2 (i) are signals generated by performing first signal processing and second signal processing on a plurality of first modulated signals s 1 (i) generated using a 16 quadrature amplitude modulation (QAM) modulation scheme and a plurality of second modulated signals s 2 (i) generated using uniform constellation 64 QAM modulation, and the plurality of first signal-processed signals z 1 (i) and the plurality of second signal-processed signals z 2 (i) satisfy an Equation (1) in regard to the plurality of first modulated signals s 1 (i) and the plurality of second modulated signals s 2 (i), wherein the Equation (1) is defined as:
(
z
1
(
i
)
z
2
(
i
)
)
=
F
(
u
0
0
v
)
(
s
1
(
i
)
s
2
(
i
)
)
,
wherein an Equation (2) is defined as:
u
=
α
×
2
5
,
wherein
an
Equation
(
3
)
is
defined
as
:
v
=
α
×
3
5
,
wherein
an
Equation
(
4
)
is
defined
as
:
F
=
(
β
×
cos
π
4
-
β
×
sin
π
4
β
×
sin
π
4
β
×
cos
π
4
)
,
αand βare arbitrary real numbers or imaginary numbers;
demodulating the reception signals by performing signal processing corresponding to the first signal processing and the second signal processing; and
changing a value of coefficient u expressed by Equation (2) and a value of coefficient v expressed by Equation (3) when a 64 QAM modulation used to generate the plurality of second modulated signals s 2 (i)is switched from the uniform constellation 64 QAM modulation to a non-uniform constellation 64 QAM modulation.
4. A reception device, comprising:
a receiver that obtains reception signals by receiving a first transmission signal and a second transmission signal transmitted from different antennas,
wherein the first transmission signal and the second transmission signal are signals resulting from transmitting a plurality of first signal-processed signals z 1 (i) and a plurality of second signal-processed signals z 2 (i) using a plurality of antennas, where i is a symbol number that is an integer greater than or equal to 0, and among the plurality of first signal-processed signals z 1 (i) and the plurality of second signal-processed signals z 2 (i), a first signal-processed signal and a second signal-processed signal that have identical symbol numbers are simultaneously transmitted at the same frequency,
the plurality of first signal-processed signals z 1 (i) and the plurality of second signal-processed signals z 2 (i) are signals generated by performing first signal processing and second signal processing on a plurality of first modulated signals s 1 (i) generated using a 16 quadrature amplitude modulation (QAM) modulation scheme and a plurality of second modulated signals s 2 (i) generated using uniform constellation 64 QAM modulation, and the plurality of first signal-processed signals z 1 (i) and the plurality of second signal-processed signals z 2 (i) satisfy an Equation (1) in regard to the plurality of first modulated signals s 1 (i) and the plurality of second modulated signals s 2 (i), wherein the Equation (1) is defined as:
(
z
1
(
i
)
z
2
(
i
)
)
=
F
(
u
0
0
v
)
(
s
1
(
i
)
s
2
(
i
)
)
,
wherein an Equation (2) is defined as:
u
=
α
×
2
5
,
wherein
an
Equation
(
3
)
is
defined
as
:
v
=
α
×
3
5
,
wherein
an
Equation
(
4
)
is
defined
as
:
F
=
(
β
×
cos
π
4
-
β
×
sin
π
4
β
×
sin
π
4
β
×
cos
π
4
)
,
αand βare arbitrary real numbers or imaginary numbers; and
a demodulator that demodulates the reception signals by performing signal processing corresponding to the first signal processing and the second signal processing,
wherein the a value of coefficient u expressed by Equation (2) and a value of coefficient v expressed by Equation (3) are changed when a 64 QAM modulation used to generate the plurality of second modulated signals s 2 (i) is switched from the uniform constellation 64 QAM modulation to a non-uniform constellation 64 QAM modulation.