# US 2019/0173536 A1 · Transmission device and transmission method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0173536 A1 - Document ID: US20190173536A1 - Status: Published application - Kind: A1 - Application number: 16/267,884 - Filed: 2019-02-05 - Published: 2019-06-06 - Earliest claimed: 2015-02-09 - Assignees: Sun Patent Trust - Applicants: Sun Patent Trust - Inventors: Yutaka MURAKAMI; Tomohiro KIMURA; Mikihiro OUCHI - Web page: https://patentgrep.com/patent/US20190173536A1 ## CPC - H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting - H04B 7/046: {taking physical layer constraints into account} - H04B 7/0615: {of weighted versions of same signal} - H04B 7/0682: {using phase diversity (e.g. phase sweeping)} - H04L 1/005: {Iterative decoding, including iteration between signal detection and decoding operation} - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A transmission device comprising: a weighting circuity which, in operation, generates transmission signals of n streams (n is an integer of 3 or more) by weighting modulated signals of the n streams using a predetermined fixed precoding matrix; a phase changing circuity which, in operation, regularly changes each phase of a symbol series included in each of the transmission signals of the n streams; and a transmitter which, in operation, transmits the transmission signals of the n streams from different antennas, the phases of each of the transmission signals of the n streams being changed in each symbol, wherein the transmission signal of an i-th stream has an mi kind of phase change value y1(t) (i is an integer between 1 and n (inclusive), 0≤yi<2π, and mi is set in each stream, t is an integer of 0 or more, and indicates a symbol slot), and the phase changing circuity changes the phase in one or more u (u=m1×m2× . . . mn) symbol periods using all patterns of a set of phase change values yi(t) different from each other in each symbol. ## Claims ### Claim 1 A transmission device comprising: pre-coding circuity which, in operation, generates first to fourth pre-coded symbols zd1(t)-zd4(t) by pre-coding first to fourth modulation symbols s1(t)-s4(t) using a precoding matrix; phase changing circuity which, in operation, generates second to fourth phase changed symbols z2(t)-z4(t) by regularly phase changing at least one pre-coded symbol of the second to the fourth pre-coded symbols zd2(t)-zd4(t) by using M phase changing values at times other than a first time, M being an integer of 2 or more; and a transmitter which, in operation, transmits the first pre-coded symbols zd1(t) and the second to the fourth phase-changed symbols z2(t)-z4(t) from different transmission antennas. ### Claim 2 (depends on 1) The transmission device according to claim 1, wherein the phase changing circuity continuously phase changes each M×M symbols in at least two pre-coded symbols zdn(t) of the second to fourth pre-coded symbols zd2(t)-zd4(t) by using the M phase change values to be changed each M symbols, the at least two pre-coded symbols zdn(t) being at least any two of zd2(t) to zd4(t). ### Claim 3 (depends on 1) The transmission device according to claim 1, wherein at least two pre-coded symbols of the second to fourth pre-coded symbols zd2(t)-zd4(t) are phase changed using the same phase change value at least once in the same time. ### Claim 4 A transmission method comprising: generating first to fourth pre-coded symbols zd1(t)-zd4(t) by pre-coding first to fourth modulation symbols s1(t)-s4(t) using a precoding matrix; generating second to fourth phase changed symbols z2(t)-z4(t) by regularly phase changing at least one pre-coded symbol of the the second to the fourth pre-coded symbols zd2(t)-zd4(t) by using M phase changing values at times other than a first time, M being an integer of 2 or more; and transmitting the first pre-coded symbols zd1(t) and the second to the fourth phase-changed symbols z2(t)-z4(t) from different transmission antennas. ### Claim 5 (depends on 4) The transmission method according to claim 4, wherein at least two pre-coded symbols zdn(t) of the second to fourth pre-coded symbols zd2(t)-zd4(t) are continuously phase changed each M×M symbols by using the M phase change values to be changed each M symbols, the at least two pre-coded symbols zdn(t) being at least any two of zd2(t) to zd4(t). ### Claim 6 (depends on 4) The transmission method according to claim 4, wherein at least two pre-coded symbols of the second to fourth pre-coded symbols zd2(t)-zd4(t) are phase changed using the same phase change value at least once in the same time. ### Claim 7 A reception device comprising: reception circuitry which, in operation, receives four multiplexed symbols rm(t) by the four reception antennas respectively; and signal processing circuitry which, in operation, separates the four multiplexed symbols rm(t) into first to fourth symbols rs1(t)-rs4(t), wherein the first to the fourth symbols rs1(t)-rs4(t) are generated by: pre-coding first to fourth modulation symbols s1(t)-s4(t) using a precoding matrix to generate first to fourth pre-coded symbols zd1(t)-zd4(t), regularly phase changing, by using M phase change values at times other than a first time, at least one pre-coded symbol of the second to the fourth pre-coded symbols zd2(t)-zd4(t) to generate second to fourth phase changed symbols z2(t)-z4(t), M being an integer of 2 or more, and transmitting, from different transmission antennas, the first pre-coded symbols zd1(t) and the second to the fourth phase-changed symbols z2(t)-z4(t). ### Claim 8 (depends on 7) The reception device according to claim 7, wherein at least two pre-coded symbols zdn(t) of the second to fourth pre-coded symbols zd2(t)-zd4(t) are continuously phase changed each M×M symbols by using the M phase change values to be changed each M symbols, the at least two pre-coded symbols zdn(t) being at least any two of zd2(t) to zd4(t). ### Claim 9 (depends on 7) The reception device according to claim 7, wherein at least two pre-coded symbols of the second to fourth pre-coded symbols zd2(t)-zd4(t) are phase changed using the same phase change value at least once in the same time. ### Claim 10 A reception method comprising: receiving four multiplexed symbols rm(t) by the four reception antennas respectively; and separating the four multiplexed symbols rm(t) into first to fourth symbols rs1(t)-rs4(t), wherein the first to the fourth symbols rs(t)-rs(t) are generated by: pre-coding first to fourth modulation symbols s1(t)-s4(t) using a precoding matrix to generate first to fourth pre-coded symbols zd1(t)-zd4(t), regularly phase changing, by using M phase change values at times other than a first time, at least one pre-coded symbol of the second to fourth pre-coded symbols zd2(t)-zd4(t) to generate second to fourth phase changed symbols z2(t)-z4(t), M being an integer of 2 or more, and transmitting, from different transmission antennas, the first pre-coded symbols zd1(t) and the second to the fourth phase-changed symbols z2(t)-z4(t). ### Claim 11 (depends on 10) The reception method according to claim 10, wherein at least two pre-coded symbols zdn(t) of the second to fourth pre-coded symbols zd2(t)-zd4(t) are continuously phase changed each M×M symbols by using the M phase change values to be changed each M symbols, the at least two pre-coded symbols zdn(t) being at least any two of zd2(t) to zd4(t). ### Claim 12 (depends on 10) The reception method according to claim 10, wherein at least two pre-coded symbols of the second to fourth pre-coded symbols zd2(t)-d4(t) are phase changed using the same phase change value at least once in the same time.