# US 2025/0168043 A1 · Method and apparatus for sending multi-tone signal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0168043 A1 - Document ID: US20250168043A1 - Status: Published application - Kind: A1 - Application number: 19/029,627 - Filed: 2025-01-17 - Published: 2025-05-22 - Earliest claimed: 2022-08-01 - Applicants: Huawei Technologies Co., Ltd. - Inventors: Wei WANG; Heng ZHANG - Web page: https://patentgrep.com/patent/US20250168043A1 ## CPC - H04L 25/03006: {Arrangements for removing intersymbol interference} - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH} - H04L 27/2602: {Signal structure} - H04L 27/2621: {Reduction thereof using phase offsets between subcarriers} - H04L 2025/03414: {Multicarrier} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract The present disclosure relates to methods and apparatuses for sending a multi-tone signal. One example method includes generating a first multi-tone signal, and sending the first multi-tone signal. The first multi-tone signal includes N single-tone signals. Amplitude values of the single-tone signals are the same. Initial phases of at least two of the N single-tone signals are the same or absolute values of initial phases of at least two of the N single-tone signals are the same. N is an integer greater than or equal to 2. ## Claims ### Claim 1 A method for sending a multi-tone signal, comprising: generating a first multi-tone signal, wherein the first multi-tone signal comprises N single-tone signals, wherein amplitude values of the N single-tone signals are the same, wherein initial phases of at least two of the N single-tone signals are the same or absolute values of initial phases of at least two of the N single-tone signals are the same, and wherein N is an integer greater than or equal to 2; and sending the first multi-tone signal. ### Claim 2 (depends on 1) The method according to claim 1, wherein the at least two single-tone signals with the same initial phases are symmetrical with respect to a center frequency. ### Claim 3 (depends on 1) The method according to claim 1, wherein when N=4, initial phases of the N single-tone signals meet one or more of the following: initial phases of a first single-tone signal and a fourth single-tone signal are the same; or initial phases of a second single-tone signal and a third single-tone signal are the same; and wherein a frequency of the first single-tone signal is the smallest, a frequency of the fourth single-tone signal is the largest, and a frequency of the second single-tone signal is greater than the frequency of the first single-tone signal and less than a frequency of the third single-tone signal. ### Claim 4 (depends on 1) The method according to claim 1, wherein when N=8, initial phases of the N single-tone signals meet one or more of the following: initial phases of a first single-tone signal and an eighth single-tone signal are the same; initial phases of a second single-tone signal and a seventh single-tone signal are the same; initial phases of a third single-tone signal and a sixth single-tone signal are the same; or initial phases of a fourth single-tone signal and a fifth single-tone signal are the same; and wherein a frequency of the first single-tone signal is the smallest, a frequency of the eighth single-tone signal is the largest, a frequency of the third single-tone signal is greater than a frequency of the second single-tone signal and less than a frequency of the fourth single-tone signal, a frequency of the fifth single-tone signal is greater than the frequency of the fourth single-tone signal and less than a frequency of the sixth single-tone signal, and the frequency of the sixth single-tone signal is less than a frequency of the seventh single-tone signal. ### Claim 5 (depends on 1) The method according to claim 1, wherein when N=4, initial phases of the N single-tone signals meet any one of the following: φ2 = φ3 = 0 , 1.59 ≤ φ1 < 1.86 , φ4 ≥ - φ1 + 3.57 , and ⁢ φ4 ≤ - φ1 * 4 / 9 + 2.69 ; φ2 = φ3 = 0 , 1.86 ≤ φ1 ≤ 1.98 , φ4 ≥ - φ1 + 3.57 , and ⁢ φ4 ≤ - φ1 * 9 / 4 + 6.04 ; φ2 = φ3 = 0 , 4.3 ≤ φ1 < 4.42 , φ4 ≤ - φ1 + 8.99 , and ⁢ φ4 ≥ - φ1 * 9 / 4 + 14.36 ; φ2 = φ3 = 0 , 4.42 ≤ φ1 < 4.69 , φ4 ≤ - φ1 + 8.99 , and ⁢ φ4 ≥ - φ1 * 4 / 9 + 6.38 ; φ2 = φ3 = 0 , 0 ≤ φ1 < 2.05 , φ4 ≥ - φ1 + π , and ⁢ φ4 ≤ - φ1 * 0.53 + π ; φ2 = φ3 = 0 , 2.05 ≤ φ1 ≤ π , φ4 ≥ - φ1 + π , and ⁢ φ4 ≤ - φ1 * 1.88 + 5.9 ; φ2 = φ3 = 0 , π ≤ φ1 < 4.23 , φ4 ≤ - φ1 + 9.42 , and ⁢ φ4 ≥ - φ1 * 1.88 + 12.18 ; φ2 = φ3 = 0 , 4.23 ≤ φ1 ≤ 2 ⁢ π , φ4 ≤ - φ1 + 9.42 , and ⁢ φ4 ≥ - φ1 * 0.53 + 6.47 ; φ2 = φ3 = 0 , 0 ≤ φ1 < 2.3 , φ4 ≥ - φ1 + 2.92 , and ⁢ φ4 ≤ - φ1 * 0.46 + 3.36 ; φ2 = φ3 = 0 , 2.3 ≤ φ1 < 2.92 , φ4 ≥ - φ1 + 2.92 , and ⁢ φ4 ≤ - φ1 * 2.17 + 7.29 ; φ2 = φ3 = 0 , 2.92 ≤ φ1 < 3.36 , φ4 ≥ 0 , and ⁢ φ4 ≤ - φ1 * 2.17 + 7.29 ; φ2 = φ3 = 0 , 2.92 ≤ φ1 < 3.36 , φ4 ≤ 2 ⁢ π , and ⁢ φ4 ≥ - φ1 * 2.17 + 12.62 ; φ2 = φ3 = 0 , 3.36 ≤ φ1 < 3.98 , φ4 ≤ - φ1 + 9.64 , and ⁢ φ4 ≥ - φ1 * 2.17 + 12.62 ; or φ2 = φ3 = 0 , 3.98 ≤ φ1 < 2 ⁢ π , φ4 ≤ - φ1 + 9.64 , and ⁢ φ4 ≥ - φ1 * 0.46 + 5.81 ; and wherein φ1 is an initial phase of a first single-tone signal, φ2 is an initial phase of a second single-tone signal, φ3 is an initial phase of a third single-tone signal, and φ4 is an initial phase of a fourth single-tone signal. ### Claim 6 (depends on 1) The method according to claim 1, wherein a frequency separation between any two adjacent single-tone signals in the N single-tone signals is the same. ### Claim 7 (depends on 6) The method according to claim 6, wherein when N=4, the frequency separation between any two adjacent single-tone signals in the N single-tone signals is 1 MHz. ### Claim 8 (depends on 7) The method according to claim 7, wherein: the frequency of a first single-tone signal is −1.5 MHz, the frequency of a second single-tone signal is −0.5 MHz, the frequency of a third single-tone signal is 0.5 MHz, and the frequency of a fourth single-tone signal is 1.5 MHz; or the frequency of a first single-tone signal is −1 MHz, the frequency of a second single-tone signal is 0 MHz, the frequency of a third single-tone signal is 1 MHz, and the frequency of a fourth single-tone signal is 2 MHz. ### Claim 9 (depends on 6) The method according to claim 6, wherein when N=4, the frequency separation between any two adjacent single-tone signals in the N single-tone signals is 2 MHz. ### Claim 10 (depends on 9) The method according to claim 9, wherein the frequency of a first single-tone signal is −3 MHz, the frequency of a second single-tone signal is −1 MHz, the frequency of a third single-tone signal is 1 MHz, and the frequency of a fourth single-tone signal is 3 MHz. ### Claim 11 An apparatus for sending a multi-tone signal, comprising: at least one processor; at least one memory coupled to the at least one processor and storing programming instructions for execution by the at least one processor to generate a first multi-tone signal, wherein the first multi-tone signal comprises N single-tone signals, wherein amplitude values of the N single-tone signals are the same, wherein initial phases of at least two of the N single-tone signals are the same or absolute values of initial phases of at least two of the N single-tone signals are the same, and wherein N is an integer greater than or equal to 2; and a transceiver, the transceiver configured to send the first multi-tone signal. ### Claim 12 (depends on 11) The apparatus according to claim 11, wherein the at least two single-tone signals with the same initial phases are symmetrical with respect to a center frequency. ### Claim 13 (depends on 11) The apparatus according to claim 11, wherein when N=4, initial phases of the N single-tone signals meet one or more of the following: initial phases of a first single-tone signal and a fourth single-tone signal are the same; or initial phases of a second single-tone signal and a third single-tone signal are the same; and wherein a frequency of the first single-tone signal is the smallest, a frequency of the fourth single-tone signal is the largest, and a frequency of the second single-tone signal is greater than the frequency of the first single-tone signal and less than a frequency of the third single-tone signal. ### Claim 14 (depends on 11) The apparatus according to claim 11, wherein when N=8, initial phases of the N single-tone signals meet one or more of the following: initial phases of a first single-tone signal and an eighth single-tone signal are the same; initial phases of a second single-tone signal and a seventh single-tone signal are the same; initial phases of a third single-tone signal and a sixth single-tone signal are the same; or initial phases of a fourth single-tone signal and a fifth single-tone signal are the same; and wherein a frequency of the first single-tone signal is the smallest, a frequency of the eighth single-tone signal is the largest, a frequency of the third single-tone signal is greater than a frequency of the second single-tone signal and less than a frequency of the fourth single-tone signal, a frequency of the fifth single-tone signal is greater than the frequency of the fourth single-tone signal and less than a frequency of the sixth single-tone signal, and the frequency of the sixth single-tone signal is less than a frequency of the seventh single-tone signal. ### Claim 15 (depends on 11) The apparatus according to claim 11, wherein when N=4, initial phases of the N single-tone signals meet any one of the following: φ2 = φ3 = 0 , 1.59 ≤ φ1 < 1.86 , φ4 ≥ - φ1 + 3.57 , and ⁢ φ4 ≤ - φ1 * 4 / 9 + 2.69 ; φ2 = φ3 = 0 , 1.86 ≤ φ1 ≤ 1.98 , φ4 ≥ - φ1 + 3.57 , and ⁢ φ4 ≤ - φ1 * 9 / 4 + 6.04 ; φ2 = φ3 = 0 , 4.3 ≤ φ1 < 4.42 , φ4 ≤ - φ1 + 8.99 , and ⁢ φ4 ≥ - φ1 * 9 / 4 + 14.36 ; φ2 = φ3 = 0 , 4.42 ≤ φ1 < 4.69 , φ4 ≤ - φ1 + 8.99 , and ⁢ φ4 ≥ - φ1 * 4 / 9 + 6.38 ; φ2 = φ3 = 0 , 0 ≤ φ1 < 2.05 , φ4 ≥ - φ1 + π , and ⁢ φ4 ≤ - φ1 * 0.53 + π ; φ2 = φ3 = 0 , 2.05 ≤ φ1 ≤ π , φ4 ≥ - φ1 + π , and ⁢ φ4 ≤ - φ1 * 1.88 + 5.9 ; φ2 = φ3 = 0 , π ≤ φ1 < 4.23 , φ4 ≤ - φ1 + 9.42 , and ⁢ φ4 ≥ - φ1 * 1.88 + 12.18 ; φ2 = φ3 = 0 , 4.23 ≤ φ1 ≤ 2 ⁢ π , φ4 ≤ - φ1 + 9.42 , and ⁢ φ4 ≥ - φ1 * 0.53 + 6.47 ; φ2 = φ3 = 0 , 0 ≤ φ1 < 2.3 , φ4 ≥ - φ1 + 2.92 , and ⁢ φ4 ≤ - φ1 * 0.46 + 3.36 ; φ2 = φ3 = 0 , 2.3 ≤ φ1 < 2.92 , φ4 ≥ - φ1 + 2.92 , and ⁢ φ4 ≤ - φ1 * 2.17 + 7.29 ; φ2 = φ3 = 0 , 2.92 ≤ φ1 < 3.36 , φ4 ≥ 0 , and ⁢ φ4 ≤ - φ1 * 2.17 + 7.29 ; φ2 = φ3 = 0 , 2.92 ≤ φ1 < 3.36 , φ4 ≤ 2 ⁢ π , and ⁢ φ4 ≥ - φ1 * 2.17 + 12.62 ; φ2 = φ3 = 0 , 3.36 ≤ φ1 < 3.98 , φ4 ≤ - φ1 + 9.64 , and ⁢ φ4 ≥ - φ1 * 2.17 + 12.62 ; or φ2 = φ3 = 0 , 3.98 ≤ φ1 < 2 ⁢ π , φ4 ≤ - φ1 + 9.64 , and ⁢ φ4 ≥ - φ1 * 0.46 + 5.81 ; and wherein φ1 is an initial phase of a first single-tone signal, φ2 is an initial phase of a second single-tone signal, φ3 is an initial phase of a third single-tone signal, and φ4 is an initial phase of a fourth single-tone signal. ### Claim 16 (depends on 11) The apparatus according to claim 11, wherein a frequency separation between any two adjacent single-tone signals in the N single-tone signals is the same. ### Claim 17 (depends on 16) The apparatus according to claim 16, wherein when N=4, the frequency separation between any two adjacent single-tone signals in the N single-tone signals is 1 MHz. ### Claim 18 (depends on 17) The apparatus according to claim 17, wherein: the frequency of a first single-tone signal is −1.5 MHz, the frequency of a second single-tone signal is −0.5 MHz, the frequency of a third single-tone signal is 0.5 MHz, and the frequency of a fourth single-tone signal is 1.5 MHz; or the frequency of a first single-tone signal is −1 MHz, the frequency of a second single-tone signal is 0 MHz, the frequency of a third single-tone signal is 1 MHz, and the frequency of a fourth single-tone signal is 2 MHz. ### Claim 19 (depends on 16) The apparatus according to claim 16, wherein when N=4, the frequency separation between any two adjacent single-tone signals in the N single-tone signals is 2 MHz. ### Claim 20 (depends on 19) The apparatus according to claim 19, wherein the frequency of a first single-tone signal is −3 MHz, the frequency of a second single-tone signal is −1 MHz, the frequency of a third single-tone signal is 1 MHz, and the frequency of a fourth single-tone signal is 3 MHz.