# US 9,520,934 B2 · Transmission method, transmission device, reception method and reception device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,520,934 B2 - Document ID: US9520934B2 - Status: Granted - Kind: B2 - Application number: 15/134,014 - Filed: 2016-04-20 - Published: 2016-08-11 - Granted: 2016-12-13 - Earliest claimed: 2013-10-31 - Assignees: Panasonic Intellectual Property Corporation of America - Applicants: Panasonic Intellectual Property Corporation of America - Inventors: Yutaka Murakami; Tomohiro Kimura; Mikihiro Ouchi - Web page: https://patentgrep.com/patent/US9520934B2 ## CPC - H04L 27/2604: {Multiresolution systems (by means of multiresolution subcarriers H04L27/183, H04L27/3488)} - H04B 7/0413: MIMO systems - H04B 7/06: at the transmitting station - H04B 7/0682: {using phase diversity (e.g. phase sweeping)} - H04B 7/0697: {using spatial multiplexing} - H04B 7/08: at the receiving station - H04L 27/3405: {Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power} - H04L 27/3416: {in which the information is carried by both the individual signal points and the subset to which the individual points belong, e.g. using coset coding, lattice coding, or related schemes} - H04L 27/36: Modulator circuits; Transmitter circuits - H04L 27/38: Demodulator circuits; Receiver circuits - H04L 1/005: {Iterative decoding, including iteration between signal detection and decoding operation} - H04L 1/0071: {Use of interleaving (interleaving per se H03M13/27)} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION ## Abstract 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. ## Claims ### Claim 1 A transmission method comprising: mapping processing of generating a plurality of first modulated signals s1 and a plurality of second modulated signals s2 using a first mapping scheme, the plurality of second modulated signals s2 being equal to the plurality of first modulated signals s1, and generating a plurality of third modulated signals s3 and a plurality of fourth modulated signals s4 using a second mapping scheme, the plurality of fourth modulated signals s4 being equal to the plurality of third modulated signals s3, 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 s2 using all N kinds of phases, and performing the phase change on the plurality of fourth modulated signals s4 using all the N kinds of phases, the N being an integer of 2 or more; and transmission processing of transmitting sequentially the plurality of first modulated signals s1 and the plurality of third modulated signals s3 using a first antenna, transmitting each of the plurality of second modulated signals s2 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 s1, and transmitting each of the plurality of fourth modulated signals s4 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 s3. ### Claim 2 A transmission device comprising: mapping circuitry which, in operation, generates a plurality of first modulated signals s1 and a plurality of second modulated signals s2 using a first mapping scheme, the plurality of first modulated signals s1 being equal to the plurality of second modulated signals s2, and generates a plurality of third modulated signals s3 and a plurality of fourth modulated signals s4 using a second mapping scheme, the plurality of third modulated signals s3 being equal to the plurality of fourth modulated signals s4, 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 s2 using all N kinds of phases, and performs the phase change on the plurality of fourth modulated signals s4 using all the N kinds of phases, the N being an integer of 2 or more; and transmission circuitry which, in operation, transmits sequentially the plurality of first modulated signals s1 and the plurality of third modulated signals s3 using a first antenna, transmits each of the plurality of second modulated signals s2 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 s1, and transmits each of the plurality of fourth modulated signals s4 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 s3. ### Claim 3 A reception method comprising: reception processing of acquiring reception signals, the reception signals being signals obtained by sequentially receiving a plurality of first modulated signals s1, a plurality of third modulated signals s3, a plurality of second modulated signals s2, and a plurality of fourth modulated signals s4, the plurality of first modulated signals s1 and the plurality of third modulated signals s3 being sequentially transmitted from a first antenna, the plurality of second modulated signals s2 and the plurality of fourth modulated signals s4 being sequentially transmitted from a second antenna, each of the plurality of second modulated signals s2 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 s1, each of the plurality of fourth modulated signals s4 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 s3, the plurality of second modulated signals s2 being modulated signals subjected to a phase change using all N kinds of phases before the transmission, the N being an integer of 2 or more, the plurality of fourth modulated signals s4 being modulated signals subjected to the phase change using all the N kinds of phases before the transmission, the plurality of first modulated signals s1 and the plurality of second modulated signals s2 being generated using a first mapping scheme, the plurality of first modulated signals s1 being equal to the plurality of second modulated signals s2, the plurality of pre-phase-change third modulated signals s3 and the plurality of pre-phase-change fourth modulated signals s4 being generated using a second mapping scheme, the plurality of pre-phase-change third modulated signals s3 being equal to the plurality of pre-phase-change fourth modulated signals s4, 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. ### Claim 4 A reception device comprising: reception circuitry which, in operation, acquires reception signals, the reception signals being signals obtained by sequentially receiving a plurality of first modulated signals s1, a plurality of third modulated signals s3, a plurality of second modulated signals s2, and a plurality of fourth modulated signals s4, the plurality of first modulated signals s1 and the plurality of third modulated signals s3 being sequentially transmitted from a first antenna, the plurality of second modulated signals s2 and the plurality of fourth modulated signals s4 being sequentially transmitted from a second antenna, each of the plurality of second modulated signals s2 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 s1, each of the plurality of fourth modulated signals s4 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 s3, the plurality of second modulated signals s2 being modulated signals subjected to a phase change using all N kinds of phases before the transmission, the N being an integer of 2 or more, the plurality of fourth modulated signals s4 being modulated signals subjected to a phase change using all the N kinds of phases before the transmission, the plurality of first modulated signals s1 and the plurality of second modulated signals s2 being generated using a first mapping scheme, the plurality of first modulated signals s1 being equal to the plurality of second modulated signals s2, the plurality of pre-phase-change third modulated signals s3 and the plurality of pre-phase-change fourth modulated signals s4 being generated using a second mapping scheme, the plurality of pre-phase-change third modulated signals s3 being equal to the plurality of pre-phase-change fourth modulated signals s4, 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.