Signal generating method and signal generating apparatus
A transmission apparatus that (i) generates a Quadrature Phase Shift Keying (QPSK) modulation signal s 1 ( t ) by applying a QPSK modulation scheme to a first data sequence, (ii) generates a 16-Quadrature Amplitude Modulation (QAM) modulation signal s 2 ( t ) by applying a 16-QAM modulation scheme to a second data sequence, (iii) generates a transmission signal z 1 ( t ) and a second transmission signal z 2 ( t ) by applying a phase hopping process, a precoding process, and a power adjust process to the QPSK modulation signal s 1 ( t ) and the 16-QAM modulation signal s 2 ( t ), wherein an average transmission power of the 16-QAM modulation signal s 2 ( t ) being the same as an average transmission power of the QPSK modulation signal s 1 ( t ), and (iv) transmits the transmission signal z 1 ( t ) from a first antenna at a first time and a first frequency and the second transmission signal z 2 ( t ) from a second antenna at the first time and the first frequency.
1. A transmission apparatus comprising:
modulation circuitry that
(i) generates a Quadrature Phase Shift Keying (QPSK) modulation signal s 1 ( t ) by applying a QPSK modulation scheme to a first data sequence,
(ii) generates a 16-Quadrature Amplitude Modulation (QAM) modulation signal s 2 ( t ) by applying a 16-QAM modulation scheme to a second data sequence, and
(iii) generates a first transmission signal z 1 ( t ) and a second transmission signal z 2 ( t ) by applying a phase hopping process, a precoding process, and a power adjust process indicated in Equation 1 to the QPSK modulation signal s 1 ( t ) and the 16-QAM modulation signal s 2 ( t ), an average transmission power of the 16-QAM modulation signal s 2 ( t ) being the same as an average transmission power of the QPSK modulation signal s 1 ( t ); and
transmission circuitry that transmits the first transmission signal z 1 ( t ) from a first antenna at a first time and a first frequency and the second transmission signal z 2 ( t ) from a second antenna at the first time and the first frequency, wherein
(
z
1
(
t
)
z
2
(
t
)
)
=
(
1
0
0
e
j
θ
π
t
)
×
1
2
(
1
1
1
-
1
)
×
(
v
0
0
v
*
2
)
×
(
s
1
(
t
)
s
2
(
t
)
)
(
Equation
1
)
where v is a positive real number and a coefficient for power changing the QPSK modulation signal s 1 ( t ) and the 16-QAM modulation signal s 2 ( t ), t indicates a slot, and θ is a positive real number and a coefficient for determining a phase to be changed.
2. A transmission method comprising:
generating a Quadrature Phase Shift Keying (QPSK) modulation signal s 1 ( t ) by applying a QPSK modulation scheme to a first data sequence,
generating a 16-Quadrature Amplitude Modulation (QAM) modulation signal s 2 ( t ) by applying a 16-QAM modulation scheme to a second data sequence, an average transmission power of the 16-QAM modulation signal s 2 ( t ) being the same as an average transmission power of the QPSK modulation signal s 1 ( t );
generating a first transmission signal z 1 ( t ) and a second transmission signal z 2 ( t ) by applying a phase hopping process, a precoding process, and a power adjust process indicated in Equation 1to the QPSK modulation signal s 1 ( t ) and the 16-QAM modulation signal s 2 ( t ); and
transmitting the first transmission signal z 1 ( t ) from a first antenna at a first time and a first frequency and the second transmission signal z 2 ( t ) from a second antenna at the first time and the first frequency, wherein
(
z
1
(
t
)
z
2
(
t
)
)
=
(
1
0
0
e
j
θ
π
t
)
×
1
2
(
1
1
1
-
1
)
×
(
v
0
0
v
*
2
)
×
(
s
1
(
t
)
s
2
(
t
)
)
(
Equation
1
)
where v is a positive real number and a coefficient for power changing the QPSK modulation signal s 1 ( t ) and the 16-QAM modulation signal s 2 ( t ), t indicates a slot, and θ is a positive real number and a coefficient for determining a phase to be changed.