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US 2019/0199416 A1Published application
Precoding method, transmitting device, and receiving device
AssigneeSun Patent Trust
InventorsYutaka MURAKAMI, Tomohiro KIMURA, Mikihiro OUCHI
Life of this patent
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Abstract
A transmission scheme for transmitting a first modulated signal and a second modulated signal in the same frequency at the same time. According to the transmission scheme, a precoding weight multiplying unit multiplies a precoding weight by a baseband signal after a first mapping and a baseband signal after a second mapping and outputs the first modulated signal and the second modulated signal. In the precoding weight multiplying unit, precoding weights are regularly hopped.
Claims5
1-6. (canceled)
A wireless base station apparatus comprising:
- control signal generation circuitry that generates a control signal indicating whether or not to perform a precoding process on a first signal s1(t) and a second signal s2(t), t being an integer equal to greater than 0;
- and
- transmission circuitry that transmits the control signal to a wireless terminal apparatus, wherein
- in a case of performing the precoding process, a first transmission signal z1(t) and a second transmission signal z2(t) to be transmitted to the wireless terminal apparatus are generated by:
- applying a power adjustment to the first signal s1(t) and the second signal s2(t),
- applying the precoding process to the first signal s1(t) and the second signal s2(t) in accordance with Equation 1, and
- applying a transmission to the first transmission signal z1(t) and a second transmission signal z2(t) from different antennas at a same frequency and at a same time, wherein
- Equation 1 is expressible as:
- (
- z
-
-
- 1
-
- (
- t
- )
- z
-
-
- 2
-
- (
- t
- )
- )
- =
- 1
- 2
-
- (
- e
- j
-
-
- 0
- e
- j
-
-
- 0
- e
- j
-
-
- θ
- 21
-
- (
- i
- )
- e
- j
-
- (
- θ
- 21
-
- (
- i
- )
- +
- π
- )
- )
-
- (
- s
-
-
- 1
-
- (
- t
- )
- s
-
-
- 2
-
- (
- t
- )
- )
- ,
- and
- θ
- 21
-
- (
- 0
- )
- =
- 0
- ,
- θ
- 21
-
- (
- 1
- )
- =
- π
- 2
- ,
- where a variable i is an integer value that varies according to t, and
- θ21(i) is a function with the variable i that is a set of 0 and 1.
104 more elements
A transmission method for a wireless base station apparatus comprising:
- generating a control signal indicating whether or not to perform a precoding process on a first signal s1(t) and a second signal s2(t), t being an integer equal to greater than 0;
- and
- transmitting the control signal to the wireless terminal apparatus, wherein
- in a case of performing the precoding process, a first transmission signal z1(t) and a second transmission signal z2(t) to be transmitted to the wireless terminal apparatus are generated by:
- applying a power adjustment to the first signal s1(t) and the second signal s2(t),
- applying the precoding process to the first signal s1(t) and the second signal s2(t) in accordance with Equation 2, and
- applying a transmission to the first transmission signal z1(t) and a second transmission signal z2(t) from different antennas at a same frequency and at a same time, wherein
- Equation 2 is expressible as:
- (
- z
-
-
- 1
-
- (
- t
- )
- z
-
-
- 2
-
- (
- t
- )
- )
- =
- 1
- 2
-
- (
- e
- j
-
-
- 0
- e
- j
-
-
- 0
- e
- j
-
-
- θ
- 21
-
- (
- i
- )
- e
- j
-
- (
- θ
- 21
-
- (
- i
- )
- +
- π
- )
- )
-
- (
- s
-
-
- 1
-
- (
- t
- )
- s
-
-
- 2
-
- (
- t
- )
- )
- ,
- and
- θ
- 21
-
- (
- 0
- )
- =
- 0
- ,
- θ
- 21
-
- (
- 1
- )
- =
- π
- 2
- ,
- where a variable i is an integer value that varies according to t, and
- θ21(i) is a function with a variable i that is a set of 0 and 1.
104 more elements
A wireless terminal apparatus comprising:
- reception circuitry that receives a control signal and a plurality of data reception signals transmitted from a wireless base station apparatus, the control signal indicating whether or not a precoding process is applied with respect to the plurality of data reception signals;
- and
- decoding circuitry that decodes the plurality of data reception signals based on the control signal, wherein
- in a case of executing the precoding process, a first transmission signal z1(t) and a second transmission signal z2(t), t being an integer equal to greater than 0 to be transmitted to the wireless terminal apparatus are generated by:
- applying a power adjustment to a first signal s1(t) and a second signal s2(t),
- applying the precoding process to the first signal s1(t) and the second signal s2(t) in accordance with Equation 3, and
- applying a transmission to the first transmission signal z1(t) and a second transmission signal z2(t) from different antennas at a same frequency and at a same time, wherein
- Equation 3 is expressible as:
- (
- z
-
-
- 1
-
- (
- t
- )
- z
-
-
- 2
-
- (
- t
- )
- )
- =
- 1
- 2
-
- (
- e
- j
-
-
- 0
- e
- j
-
-
- 0
- e
- j
-
-
- θ
- 21
-
- (
- i
- )
- e
- j
-
- (
- θ
- 21
-
- (
- i
- )
- +
- π
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- )
-
- (
- s
-
-
- 1
-
- (
- t
- )
- s
-
-
- 2
-
- (
- t
- )
- )
- ,
- and
- θ
- 21
-
- (
- 0
- )
- =
- 0
- ,
- θ
- 21
-
- (
- 1
- )
- =
- π
- 2
- ,
- where a variable i is an integer value that varies according to t, and
- θ21(i) is a function with a variable i that is a set of 0 and 1.
104 more elements
A reception method for a wireless terminal apparatus comprising:
- receiving a control signal and a plurality of data reception signals transmitted from a wireless base station apparatus, the control signal indicating whether or not a precoding process is applied with respect to the plurality of data reception signals;
- and
- decoding the plurality of data reception signals based on the control signal, wherein
- in a case of executing the precoding process, a first transmission signal z1(t) and a second transmission signal z2(t), t being an integer equal to greater than 0 to be transmitted to the wireless terminal apparatus are generated by:
- applying a power adjustment to a first signal s1(t) and a second signal s2(t),
- applying the precoding process to the first signal s1(t) and the second signal s2(t) in accordance with Equation 4, and
- applying a transmission to the first transmission signal z1(t) and a second transmission signal z2(t) from different antennas at a same frequency and at a same time, wherein
- Equation 4 is expressible as:
- (
- z
-
-
- 1
-
- (
- t
- )
- z
-
-
- 2
-
- (
- t
- )
- )
- =
- 1
- 2
-
- (
- e
- j
-
-
- 0
- e
- j
-
-
- 0
- e
- j
-
-
- θ
- 21
-
- (
- i
- )
- e
- j
-
- (
- θ
- 21
-
- (
- i
- )
- +
- π
- )
- )
-
- (
- s
-
-
- 1
-
- (
- t
- )
- s
-
-
- 2
-
- (
- t
- )
- )
- ,
- and
- θ
- 21
-
- (
- 0
- )
- =
- 0
- ,
- θ
- 21
-
- (
- 1
- )
- =
- π
- 2
- ,
- where a variable i is an integer value that varies according to t, and
- θ21(i) is a function with a variable i that is a set of 0 and 1.
104 more elements
Dependencies are inferred from the claim text.