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 s 1 (i) and second modulated signals s 2 (i) from transmission data, the plurality of first modulated signals s 1 (i) being signals generated using a QPSK modulation scheme, and the plurality of second modulated signals s 2 (i) being signals generated using 16 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 a predetermined equation; and 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. A first signal-processed signal and a second signal-processed signal having identical symbol numbers are simultaneously transmitted at the same frequency.
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 QPSK modulation scheme, and the plurality of second modulated signals s 2 (i) being signals generated using 16 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 Equation (1),
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.
1
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α and β are arbitrary real numbers or imaginary numbers, and y(i) is a phase change value that changes in a cycle N, where N is an integer that is greater than or equal to 2; and
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.
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 QPSK modulation scheme, and the plurality of second modulated signals s 2 (i) being signals generated using 16 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 Equation (1),
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3
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where
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α and β are arbitrary real numbers or imaginary numbers, and y(i) is a phase change value that changes in a cycle N, where N is an integer that is greater than or equal to 2; 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.
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 on a plurality of first modulated signals s 1 (i) generated using a QPSK modulation scheme and a plurality of second modulated signals s 2 (i) generated using 16 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 Equation (1) in regard to the plurality of first modulated signals s 1 (i) and the plurality of second modulated signals s 2 (i),
[
MATH
.
5
]
(
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1
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i
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z
2
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1
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where
Equation
(
1
)
[
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.
6
]
u
=
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2
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Equation
(
2
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v
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Equation
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sin
π
4
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×
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Equation
(
4
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α and β are arbitrary real numbers or imaginary numbers, and y(i) is a phase change value that changes in a cycle N, where N is an integer that is greater than or equal to 2; and
demodulating the reception signals by performing second signal processing corresponding to the first signal processing.
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 on a plurality of first modulated signals s 1 (i) generated using a QPSK modulation scheme and a plurality of second modulated signals s 2 (i) generated using 16 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 Equation (1) in regard to the plurality of first modulated signals s 1 (i) and the plurality of second modulated signals s 2 (i),
[
MATH
.
7
]
(
z
1
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i
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z
2
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s
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where
Equation
(
1
)
[
MATH
.
8
]
u
=
α
×
2
3
Equation
(
2
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v
=
α
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4
3
Equation
(
3
)
F
=
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β
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π
4
-
β
×
sin
π
4
β
×
sin
π
4
β
×
cos
π
4
)
Equation
(
4
)
α and β are arbitrary real numbers or imaginary numbers, and y(i) is a phase change value that changes in a cycle N, where N is an integer that is greater than or equal to 2; and
a demodulator that demodulates the reception signals by performing second signal processing corresponding to the first signal processing.