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 16QAM 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:
modulating QPSK points s 1 ( i ) by using bits of a first stream and 16-QAM points s 2 ( i ) by using bits of a second stream, where i is an integer greater than or equal to 0;
converting the QPSK points s 1 ( i ) and the 16-QAM points s 2 ( i ) to first converted points z 1 ( i ) and second converted points z 2 ( i ), the first converted points z 1 ( i ) and the second converted points z 2 ( i ) satisfying Equation (1),
(
z
1
(
i
)
z
2
(
i
)
)
=
(
1
0
0
y
(
i
)
)
1
2
(
1
1
1
-
1
)
(
2
/
3
0
0
4
/
3
)
(
s
1
(
i
)
s
2
(
i
)
)
Equation
(
1
)
where y(i) changes in N period, where N is an integer that is greater than or equal to 2; and
transmitting the first converted points z 1 ( i ) and the second converted points z 2 ( i ) using a plurality of antennas.
2. A transmission device, comprising:
a mapper that, in operation, modulates QPSK points s 1 ( i ) by using bits of a first stream and 16-QAM points s 2 ( i ) by using bits of a second stream, where i is an integer greater than or equal to 0;
a signal processor that, in operation, converts the QPSK points s 1 ( i ) and the 16-QAM points s 2 ( i ) to first converted points z 1 ( i ) and second converted points z 2 ( i ), the first converted points z 1 ( i ) and the second converted points z 2 ( i ) satisfying Equation (1),
(
z
1
(
i
)
z
2
(
i
)
)
=
(
1
0
0
y
(
i
)
)
1
2
(
1
1
1
-
1
)
(
2
/
3
0
0
4
/
3
)
(
s
1
(
i
)
s
2
(
i
)
)
Equation
(
1
)
where y(i) changes in N period, where N is an integer that is greater than or equal to 2; and
a transmitter that, in operation, transmits the first converted points z 1 ( i ) and the second converted points z 2 ( i ) using a plurality of antennas.
3. A reception method, comprising:
obtaining reception signals by receiving first converted signals z 1 ( i ) and second converted signals z 2 ( i ) transmitted by using plurality of antennas, where i is an integer greater than or equal to 0,
wherein the first converted signals z 1 ( i ) and the second converted signals z 2 ( i ) are generated by converting QPSK points s 1 ( i ) and 16-QAM points s 2 ( i ), the QPSK points s 1 ( i ) are modulated by using bits of a first stream and the 16-QAM points s 2 ( i ) are modulated by using bits of a second stream, the first converted points z 1 ( i ) and the second converted points z 2 ( i ) satisfy Equation (1),
(
z
1
(
i
)
z
2
(
i
)
)
=
(
1
0
0
y
(
i
)
)
1
2
(
1
1
1
-
1
)
(
2
/
3
0
0
4
/
3
)
(
s
1
(
i
)
s
2
(
i
)
)
Equation
(
1
)
where y(i) changes in N period, where N is an integer that is greater than or equal to 2; and
demodulating the reception signals according to the conversion applied to the QPSK points s 1 ( i ) and the 16-QAM points s 2 ( i ).
4. A reception device, comprising:
a receiver that, in operation, obtains reception signals by receiving first converted signals z 1 ( i ) and second converted signals z 2 ( i ) transmitted by using plurality of antennas, where i is an integer greater than or equal to 0,
wherein the first converted signals z 1 ( i ) and the second converted signals z 2 ( i ) are generated by converting QPSK points s 1 ( i ) and 16-QAM points s 2 ( i ), the QPSK points s 1 ( i ) are modulated by using bits of a first stream and the 16-QAM points s 2 ( i ) are modulated by using bits of a second stream, the first converted points z 1 ( i ) and the second converted points z 2 ( i ) satisfy Equation (1),
(
z
1
(
i
)
z
2
(
i
)
)
=
(
1
0
0
y
(
i
)
)
1
2
(
1
1
1
-
1
)
(
2
/
3
0
0
4
/
3
)
(
s
1
(
i
)
s
2
(
i
)
)
Equation
(
1
)
where y(i) changes in N period, where N is an integer that is greater than or equal to 2; and
a demodulator that, in operation, demodulates the reception signals according to the conversion applied to the QPSK points s 1 ( i ) and the 16-QAM points s 2 ( i ).