Signal generation method and signal generation device
First Claim
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1. An OFDM signal generation method of a transmission system, the transmission system having a first transmitter and a second transmitter, the OFDM signal generating method comprising:
- mapping, by the first transmitter, one or more coded blocks to a first mapped signal s1, the one or more coded blocks generated by using a determined error correction block coding scheme;
mapping, by the second transmitter, the one or more coded blocks to a second mapped signal s2, data included in the first mapped signal s1 being same as data included in the second mapped signal s2;
inserting, by the first transmitter, one or more pilots to the first mapped signal s1 to obtain a first pilot-inserted signal sp1;
inserting, by the second transmitter, the one or more pilots to the second mapped signal s2 to obtain a second pilot-inserted signal sp2;
phase-changing, by the first transmitter, the first pilot-inserted signal sp1 for each of a plurality of slots to obtain a first transmission signal z1 by using a first scheme of a regularly varying phase change process;
phase-changing, by the second transmitter, the second pilot-inserted signal sp2 for each of the plurality of slots to obtain a second transmission signal z2 by using a second scheme of the regularly varying phase change process;
converting, by the first transmitter, the first transmission signal z1 for each of the plurality of slots to a first OFDM signal for each of a plurality of subcarriers;
converting, by the second transmitter, the second transmission signal z2 for each of the plurality of slots to a second OFDM signal for each of the plurality of subcarriers;
applying, by the first transmitter, a Peak-to-Average Power Ratio (PAPR) reduction process to the first OFDM signal to be transmitted from a first antenna at a first period at a first frequency; and
applying, by the second transmitter, the PAPR reduction process to the second OFDM signal to be transmitted from a second antenna at the first period at the first frequency.
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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.
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Citations
4 Claims
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1. An OFDM signal generation method of a transmission system, the transmission system having a first transmitter and a second transmitter, the OFDM signal generating method comprising:
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mapping, by the first transmitter, one or more coded blocks to a first mapped signal s1, the one or more coded blocks generated by using a determined error correction block coding scheme; mapping, by the second transmitter, the one or more coded blocks to a second mapped signal s2, data included in the first mapped signal s1 being same as data included in the second mapped signal s2; inserting, by the first transmitter, one or more pilots to the first mapped signal s1 to obtain a first pilot-inserted signal sp1; inserting, by the second transmitter, the one or more pilots to the second mapped signal s2 to obtain a second pilot-inserted signal sp2; phase-changing, by the first transmitter, the first pilot-inserted signal sp1 for each of a plurality of slots to obtain a first transmission signal z1 by using a first scheme of a regularly varying phase change process; phase-changing, by the second transmitter, the second pilot-inserted signal sp2 for each of the plurality of slots to obtain a second transmission signal z2 by using a second scheme of the regularly varying phase change process; converting, by the first transmitter, the first transmission signal z1 for each of the plurality of slots to a first OFDM signal for each of a plurality of subcarriers; converting, by the second transmitter, the second transmission signal z2 for each of the plurality of slots to a second OFDM signal for each of the plurality of subcarriers; applying, by the first transmitter, a Peak-to-Average Power Ratio (PAPR) reduction process to the first OFDM signal to be transmitted from a first antenna at a first period at a first frequency; and applying, by the second transmitter, the PAPR reduction process to the second OFDM signal to be transmitted from a second antenna at the first period at the first frequency.
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2. An OFDM signal generation system comprising:
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a first OFDM signal generator; and a second OFDM signal generator, wherein the first OFDM signal generator, in operation, maps one or more coded blocks to a first mapped signal s1, the one or more coded blocks generated by using a determined error correction block coding scheme; inserts one or more pilots to the first mapped signal s1 to obtain a first pilot-inserted signal sp1; phase-changes the first pilot-inserted signal sp1 for each of a plurality of slots to obtain a first transmission signal z1 by using a first scheme of a regularly varying phase change process; converts the first transmission signal z1 for each of the plurality of slots to a first OFDM signal for each of a plurality of subcarriers; applies a Peak-to-Average Power Ratio (PAPR) reduction process to the first OFDM signal to be transmitted from a first antenna at a first period at a first frequency; and wherein the second OFDM signal generator, in operation, maps the one or more coded blocks to a second mapped signal s2, data included in the first mapped signal s1 being same as data included in the second mapped signal s2; inserts the one or more pilots to the second mapped signal s2 to obtain a second pilot-inserted signal sp2; phase-changes the second pilot-inserted signal sp2 for each of the plurality of slots to obtain a second transmission signal z2 by using a second scheme of the regularly varying phase change process; converts the second transmission signal z2 for each of the plurality of slots to a second OFDM signal for each of the plurality of subcarriers; and applies the PAPR reduction process to the second OFDM signal to be transmitted from a second antenna at the first period at the first frequency.
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3. A reception data generation method of a reception apparatus, the method comprising:
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acquiring a reception signal obtained by converting a first OFDM signal transmitted from a first antenna of a first transmitter at a first period at a first frequency and a second OFDM signal transmitted from a second antenna of a second transmitter at the first period at the first frequency, the first OFDM signal and the second OFDM signal having been generated through a determined generation process; and de-mapping the reception signal to reception data, through a de-map process corresponding to the determined generation process, wherein the determined generation process is a process of; mapping, by the first transmitter, one or more coded blocks to a first mapped signal s1, the one or more coded blocks generated by using a determined error correction block coding scheme; mapping, by the second transmitter, the one or more coded blocks to a second mapped signal s2, data included in the first mapped signal s1 being same as data included in the second mapped signal s2; inserting, by the first transmitter, one or more pilots to the first mapped signal s1 to obtain a first pilot-inserted signal sp1; inserting, by the second transmitter, the one or more pilots to the second mapped signal s2 to obtain a second pilot-inserted signal sp2; phase-changing, by the first transmitter, the first pilot-inserted signal sp1 for each of a plurality of slots to obtain a first transmission signal z1 by using a first scheme of a regularly varying phase change process; phase-changing, by the second transmitter, the second pilot-inserted signal sp2 for each of the plurality of slots to obtain a second transmission signal z2 by using a second scheme of the regularly varying phase change process; converting, by the first transmitter, the first transmission signal z1 for each of the plurality of slots to the first OFDM signal for each of a plurality of subcarriers; converting, by the second transmitter, the second transmission signal z2 for each of the plurality of slots to the second OFDM signal for each of the plurality of subcarriers; applying, by the first transmitter, a Peak-to-Average Power Ratio (PAPR) reduction process to the first OFDM signal to be transmitted from the first antenna at the first period at the first frequency; and applying, by the second transmitter, the PAPR reduction process to the second OFDM signal to be transmitted from the second antenna at the first period at the first frequency.
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4. A reception data generation apparatus comprising:
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a memory; and control circuitry, wherein the control circuitry, in operation, performs the steps of; acquiring a reception signal obtained by converting a first OFDM signal transmitted from a first antenna of a first transmitter at a first period at a first frequency and a second OFDM signal transmitted from a second antenna of a second transmitter at the first period at the first frequency, the first OFDM signal and the second OFDM signal having been generated through a determined generation process; and de-mapping the reception signal to reception data, through a de-map process corresponding to the determined generation process, wherein the determined generation process is a process of; mapping, by the first transmitter, one or more coded blocks to a first mapped signal s1, the one or more coded blocks generated by using a determined error correction block coding scheme; mapping, by the second transmitter, the one or more coded blocks to a second mapped signal s2, data included in the first mapped signal s1 being same as data included in the second mapped signal s2; inserting, by the first transmitter, one or more pilots to the first mapped signal s1 to obtain a first pilot-inserted signal sp1; inserting, by the second transmitter, the one or more pilots to the second mapped signal s2 to obtain a second pilot-inserted signal sp2; phase-changing, by the first transmitter, the first pilot-inserted signal sp1 for each of a plurality of slots to obtain a first transmission signal z1 by using a first scheme of a regularly varying phase change process; phase-changing, by the second transmitter, the second pilot-inserted signal sp2 for each of the plurality of slots to obtain a second transmission signal z2 by using a second scheme of the regularly varying phase change process; converting, by the first transmitter, the first transmission signal z1 for each of the plurality of slots to the first OFDM signal for each of a plurality of subcarriers; converting, by the second transmitter, the second transmission signal z2 for each of the plurality of slots to the second OFDM signal for each of the plurality of subcarriers; applying, by the first transmitter, a Peak-to-Average Power Ratio (PAPR) reduction process to the first OFDM signal to be transmitted from the first antenna at the first period at the first frequency; and applying, by the second transmitter, the PAPR reduction process to the second OFDM signal to be transmitted from the second antenna at the first period at the first frequency.
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Specification