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US 2023/0142497 A1Published application
Signal generation method and signal generation device
AssigneeSun Patent Trust
InventorsYutaka MURAKAMI, Tomohiro KIMURA, Mikihiro OUCHI
Life of this patent
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Abstract
A transmission method simultaneously transmitting a first modulated signal and a second modulated signal at a common frequency performs precoding on both signals using a fixed precoding matrix and regularly changes the phase of at least one of the signals, thereby improving received data signal quality for a reception device.
Claims7
1-4. (canceled)
A transmission method comprising:
- coding information to generate coded data blocks based on low-density parity-check (LDPC) coding scheme and Bose-Chaudhuri-Hocquenghem (BCH) coding scheme;
- performing modulation, precoding, and phase-change on the coded data blocks to generate a first transmission signal and a second transmission signal;
- and
- transmitting the first transmission signal and the second transmission signal from a first antenna and a second antenna, respectively, at a same frequency band and a same time, wherein
- the precoding is performed according to a fixed matrix F expressed as:
- 1
- α
- 2
- +
- 1
-
- (
- e
- j
-
- 0
- α
- ×
- e
- j
-
- 0
- α
- ×
- e
- j
-
- 0
- e
- j
-
- π
- )
- ,
- and
- the phase-change is performed such that a phase change amount regularly varies for every slot and the phase change amount is initialized for every coded data block,
- wherein α is a real value, e is a base of a natural logarithm, j is an imaginary unit, and π is the constant pi.
34 more elements
A reception method comprising:
- receiving a first transmission signal and a second transmission signal that have been transmitted from a first antenna and a second antenna, respectively, at a same frequency band and a same time, the first transmission signal and the second transmission signal having been generated by a generation process;
- and
- demodulating the first transmission signal and the second transmission signal to obtain information, wherein
- the generation process comprises:
- coding the information to generate coded data blocks based on low-density parity-check (LDPC) coding scheme and Bose-Chaudhuri-Hocquenghem (BCH) coding scheme;
- and
- performing modulation, precoding, and phase-change on the coded data blocks to generate a first transmission signal and a second transmission signal,
- the precoding is performed according to a fixed matrix F expressed as:
- 1
- α
- 2
- +
- 1
-
- (
- e
- j
-
- 0
- α
- ×
- e
- j
-
- 0
- α
- ×
- e
- j
-
- 0
- e
- j
-
- π
- )
- ,
- and
- the phase-change is performed such that a phase change amount regularly varies for every slot and the phase change amount is initialized for every coded data block,
- wherein α is a real value, e is a base of a natural logarithm, j is an imaginary unit, and π is the constant pi.
37 more elements
A transmission method comprising:
- coding information to generate coded data blocks based on low-density parity-check (LDPC) coding scheme and Bose-Chaudhuri-Hocquenghem (BCH) coding scheme;
- performing modulation, precoding, and phase-change on the coded data blocks to generate a first transmission signal and a second transmission signal;
- and
- transmitting the first transmission signal and the second transmission signal from a first antenna and a second antenna, respectively, at a same frequency band and a same time, wherein
- the precoding is performed according to a fixed matrix F expressed as:
- 1
- α
- 2
- +
- 1
-
- (
- e
- j
-
- 0
- α
- ×
- e
- j
-
- 0
- α
- ×
- e
- j
-
- 0
- e
- j
-
- π
- )
- ,
- the phase-change is performed on first symbols and second symbols on which the modulation and the precoding have been performed and which are provided in respective slots, and
- the phase-change is performed such that:
- a phase change amount regularly varies for every pair of a first symbol and a second symbol in a corresponding slot;
- and
- the phase change amount is initialized for every coded data block,
- wherein α is a real value, e is a base of a natural logarithm, j is an imaginary unit, and π is the constant pi.
37 more elements
Dependencies are inferred from the claim text.