Precoding method, precoding device
Disclosed is a precoding method for generating, from a plurality of baseband signals, a plurality of precoded signals that are transmitted in the same frequency bandwidth at the same time. According to the precoding method, one matrix is selected from among matrices defining a precoding process that is performed on the plurality of baseband signals by hopping between the matrices. A first baseband signal and a second baseband signal relating to a first coded block and a second coded block generated by using a predetermined error correction block coding scheme satisfy a given condition.
1. A transmission apparatus comprising:
circuitry, which in operation, generates precoded signals by using a precoding matrix expressed by an equation 1;
F
[
i
]
=
1
2
[
1
1
e
j
θ
21
(
i
)
e
j
(
θ
21
(
i
)
+
π
)
]
(
equation
1
)
a transmitter, which in operation, transmits the precoded signals from a plurality of antennas,
wherein i is different among symbols, and θ 21 satisfies an equation 2,
e
j
θ
21
(
1
)
e
j
θ
21
(
0
)
=
e
j
(
π
2
)
.
(
equation
2
)
2. The transmission apparatus according to the claim 1 , wherein the circuitry generates the precoded signals by precoding modulated symbols with the precoding matrix.
3. The transmission apparatus according to the claim 1 , wherein the circuitry periodically uses a same value for θ 21 .
4. A transmission method comprising:
generating precoded signals by using a precoding matrix expressed by an equation 1;
F
[
i
]
=
1
2
[
1
1
e
j
θ
21
(
i
)
e
j
(
θ
21
(
i
)
+
π
)
]
(
equation
1
)
transmitting the precoded signals from a plurality of antennas,
wherein i is different among symbols, and θ 21 satisfies an equation 2,
e
j
θ
21
(
1
)
e
j
θ
21
(
0
)
=
e
j
(
π
2
)
.
(
equation
2
)
5. The transmission method according to the claim 4 , wherein the precoded signals are generated by precoding modulated symbols with the precoding matrix.
6. The transmission method according to the claim 4 , wherein a same value is periodically used for θ 21 .
7. A reception apparatus comprising:
a receiver, which in operation, receives signals transmitted from a plurality of antennas, the signals being generated by using a precoding matrix expressed by an equation 1;
F
[
i
]
=
1
2
[
1
1
e
j
θ
21
(
i
)
e
j
(
θ
21
(
i
)
+
π
)
]
,
(
equation
1
)
circuitry, which in operation, demodulates the signals;
wherein i is different among symbols, and θ 21 satisfies an equation 2,
e
j
θ
21
(
1
)
e
j
θ
21
(
0
)
=
e
j
(
π
2
)
.
(
equation
2
)
8. The reception apparatus according to the claim 7 , wherein the signals are generated by precoding modulated symbols with the precoding matrix.
9. The reception apparatus according to the claim 7 , wherein the circuitry periodically uses a same value for θ 21 .
10. A reception method comprising:
receiving signals transmitted from a plurality of antennas, the signals being generated by using a precoding matrix expressed by an equation 1;
F
[
i
]
=
1
2
[
1
1
e
j
θ
21
(
i
)
e
j
(
θ
21
(
i
)
+
π
)
]
;
(
equation
1
)
demodulating the signals;
wherein i varies for each modulated symbol, and θ 21 satisfies an equation 2,
e
j
θ
21
(
1
)
e
j
θ
21
(
0
)
=
e
j
(
π
2
)
.
(
equation
2
)
11. The reception method according to the claim 10 , wherein the signals are generated by preceding modulated symbols with the precoding matrix.
12. The reception method according to the claim 10 , wherein a same value for θ 21 .