Transmission method, transmission device, reception method and reception device
View Patent ↗A transmission method includes mapping processing, phase change processing, and transmission processing. In the mapping processing, a plurality of first modulation signals and a plurality of second modulation signals are generated using a first mapping scheme, and a plurality of third modulation signals and a plurality of fourth modulation signals are generated using a second mapping scheme. In the phase change processing, a phase change is performed on the plurality of second modulation signals and the plurality of fourth modulation signals using all N kinds of phases. In the transmission processing, the first modulation signals and the second modulation signals are respectively transmitted at a same frequency and a same time from different antennas, and the third modulation signals and the fourth modulation signals are respectively transmitted at a same frequency and a same time from the different antennas.
1. A transmission method comprising:
mapping processing of
generating a plurality of first modulated signals s 1 and a plurality of second modulated signals s 2 using a first mapping scheme, the plurality of second modulated signals s 2 being equal to the plurality of first modulated signals s 1 , and
generating a plurality of third modulated signals s 3 and a plurality of fourth modulated signals s 4 using a second mapping scheme, the plurality of fourth modulated signals s 4 being equal to the plurality of third modulated signals s 3 ,
each of the first mapping scheme and the second mapping scheme involving 16 signal points, the first mapping scheme and the second mapping scheme being different from each other in a signal point arrangement;
phase change processing of
performing a phase change on the plurality of second modulated signals s 2 using N kinds of phases, and performing the phase change on the plurality of fourth modulated signals s 4 using the N kinds of phases, the N being an integer of 2 or more, the N kinds of phases being determined by a function of frequency; and
transmission processing of
transmitting the plurality of first modulated signals s 1 and the plurality of third modulated signals s 3 using a first antenna,
transmitting each of the plurality of second modulated signals s 2 subjected to the phase change using a second antenna at a same frequency and a same time as a frequency and a time of a corresponding one of the plurality of first modulated signals s 1 , and
transmitting each of the plurality of fourth modulated signals s 4 subjected to the phase change using the second antenna at a same frequency and a same time as a frequency and a time of a corresponding modulated signal of the plurality of third modulated signals s 3 .
2. A transmission device comprising:
mapping circuitry which, in operation,
generates a plurality of first modulated signals s 1 and a plurality of second modulated signals s 2 using a first mapping scheme, the plurality of first modulated signals s 1 being equal to the plurality of second modulated signals s 2 , and
generates a plurality of third modulated signals s 3 and a plurality of fourth modulated signals s 4 using a second mapping scheme, the plurality of third modulated signals s 3 being equal to the plurality of fourth modulated signals s 4 ,
each of the first mapping scheme and the second mapping scheme involving 16 signal points, the first mapping scheme and the second mapping scheme being different from each other in a signal point arrangement;
phase change circuitry which, in operation,
performs a phase change on the plurality of second modulated signals s 2 using N kinds of phases, and
performs the phase change on the plurality of fourth modulated signals s 4 using the N kinds of phases,
the N being an integer of 2 or more,
the N kinds of phases being determined by a function of frequency; and
transmission circuitry which, in operation,
transmits the plurality of first modulated signals s 1 and the plurality of third modulated signals s 3 using a first antenna,
transmits each of the plurality of second modulated signals s 2 subjected to the phase change using the second antenna at a same frequency and a same time as a frequency and a time of a corresponding modulated signal of the plurality of first modulated signals s 1 , and
transmits each of the plurality of fourth modulated signals s 4 subjected to the phase change using the second antenna at a same frequency and a same time as a frequency and a time of a corresponding modulated signal of the plurality of third modulated signals s 3 .
3. A reception method comprising:
reception processing of acquiring reception signals,
the reception signals being signals obtained by receiving a plurality of first modulated signals s 1 , a plurality of third modulated signals s 3 , a plurality of second modulated signals s 2 , and a plurality of fourth modulated signals s 4 , the plurality of first modulated signals s 1 and the plurality of third modulated signals s 3 being transmitted from a first antenna, the plurality of second modulated signals s 2 and the plurality of fourth modulated signals s 4 being transmitted from a second antenna,
each of the plurality of second modulated signals s 2 being transmitted at a same frequency and a same time as a frequency and a time of a corresponding modulated signal of the plurality of first modulated signals s 1 , each of the plurality of fourth modulated signals s 4 being transmitted at a same frequency and a same time as a frequency and a time of a corresponding modulated signal of the plurality of third modulated signals s 3 ,
the plurality of second modulated signals s 2 being modulated signals subjected to a phase change using N kinds of phases before the transmission, the N being an integer of 2 or more, the N kinds of phases being determined by a function of frequency, the plurality of fourth modulated signals s 4 being modulated signals subjected to the phase change using the N kinds of phases before the transmission,
the plurality of first modulated signals s 1 and the plurality of pre-phase-change second modulated signals s 2 being generated using a first mapping scheme, the plurality of first modulated signals s 1 being equal to the plurality of pre-phase-change second modulated signals s 2 ,
the plurality of third modulated signals s 3 and the plurality of pre-phase-change fourth modulated signals s 4 being generated using a second mapping scheme, the plurality of third modulated signals s 3 being equal to the plurality of pre-phase-change fourth modulated signals s 4 ,
each of the first mapping scheme and the second mapping scheme involving 16 signal points, the first mapping scheme and the second mapping scheme being different from each other in a signal point arrangement; and
demodulation processing of demodulating the reception signals using a first de-mapping scheme corresponding to the first mapping scheme and a second de-mapping scheme corresponding to the second mapping scheme.
4. A reception device comprising:
reception circuitry which, in operation, acquires reception signals,
the reception signals being signals obtained by receiving a plurality of first modulated signals s 1 , a plurality of third modulated signals s 3 , a plurality of second modulated signals s 2 , and a plurality of fourth modulated signals s 4 , the plurality of first modulated signals s 1 and the plurality of third modulated signals s 3 being transmitted from a first antenna, the plurality of second modulated signals s 2 and the plurality of fourth modulated signals s 4 being transmitted from a second antenna,
each of the plurality of second modulated signals s 2 being transmitted at a same frequency and a same time as a frequency and a time of a corresponding modulated signal of the plurality of first modulated signals s 1 , each of the plurality of fourth modulated signals s 4 being transmitted at a same frequency and a same time as a frequency and a time of a corresponding modulated signal of the plurality of third modulated signals s 3 ,
the plurality of second modulated signals s 2 being modulated signals subjected to a phase change using N kinds of phases before the transmission, the N being an integer of 2 or more, the N kinds of phases being determined by a function of frequency,
the plurality of fourth modulated signals s 4 being modulated signals subjected to a phase change using the N kinds of phases before the transmission,
the plurality of first modulated signals s 1 and the plurality of pre-phase-change second modulated signals s 2 being generated using a first mapping scheme, the plurality of first modulated signals s 1 being equal to the plurality of pre-phase-change second modulated signals s 2 ,
the plurality of third modulated signals s 3 and the plurality of pre-phase-change fourth modulated signals s 4 being generated using a second mapping scheme, the plurality of third modulated signals s 3 being equal to the plurality of pre-phase-change fourth modulated signals s 4 ,
each of the first mapping scheme and the second mapping scheme involving 16 signal points, the first mapping scheme and the second mapping scheme being different from each other in a signal point arrangement; and
demodulation circuitry which, in operation, demodulates the reception signals using a first de-mapping scheme corresponding to the first mapping scheme and a second de-mapping scheme corresponding to the second mapping scheme.