# US 2017/0288762 A1 · Phased array transmission device and carrier leak correction method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0288762 A1 - Document ID: US20170288762A1 - Status: Published application - Kind: A1 - Application number: 15/454,261 - Filed: 2017-03-09 - Published: 2017-10-05 - Earliest claimed: 2016-03-29 - Assignees: Panasonic Intellectual Property Management Co., Ltd. - Applicants: Panasonic Intellectual Property Management Co., Ltd. - Inventors: KENJI MIYANAGA; YUKIO OKAZAKI - Web page: https://patentgrep.com/patent/US20170288762A1 ## CPC - H04B 7/0682: {using phase diversity (e.g. phase sweeping)} - G01S 7/4008: {of transmitters} - H01Q 3/267: {Phased-array testing or checking devices} - H04B 1/0475: {with means for limiting noise, interference or distortion (H04B1/0483 takes precedence)} - G01S 2013/0254: {Active array antenna} - H04B: TRANSMISSION - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) ## Abstract Provided is a phased array transmission device including: a plurality of transmission branches, each being provided with a phase shift unit that applies a phase rotation to a baseband signal, a DC offset correction unit that adds a first correction value to an output signal of the phase shift unit, and a mixer that subjects an output signal of the DC offset correction unit to a frequency conversion to a high frequency band; and a correction control unit that calculates a second correction value with which a carrier leak component included in an output signal of the mixer is minimized, for each of a plurality of candidates for a phase rotation amount that is set for the phase rotation, and determines the first correction value on the basis of the second correction value. ## Claims ### Claim 1 A phased array transmission device comprising: a plurality of transmission branches, each being provided with a phase shifter that applies a phase rotation to a baseband signal, a first DC offset corrector that adds a first correction value to an output signal of the phase shifter, and a mixer that subjects an output signal of the first DC offset corrector to a frequency conversion to a high frequency band; and a correction controller that calculates a second correction value with which a carrier leak component included in an output signal of the mixer is minimized, for each of a plurality of candidates for a phase rotation amount that is set for the phase rotation, and determines the first correction value on the basis of the second correction value. ### Claim 2 (depends on 1) The phased array transmission device according to claim 1, wherein the correction controller determines the first correction value in such a way that a DC offset that occurs at the mixer is removed. ### Claim 3 (depends on 1) The phased array transmission device according to claim 1, wherein the transmission branches are provided with a second DC offset corrector that adds a third correction value to the baseband signal from prior to the phase rotation, and the correction controller determines the third correction value on the basis of the plurality of candidates. ### Claim 4 (depends on 3) The phased array transmission device according to claim 3, wherein the correction controller determines the third correction value in such a way that a DC offset that occurs at a stage prior to the phase shifter is removed. ### Claim 5 (depends on 1) The phased array transmission device according to claim 1, wherein the plurality of candidates θn for the phase rotation amount are expressed by the equation below, θ n = 2  π N  n + θ a (where n=0, 1, , N−1; N is an integer that is equal to or greater than 2; and θa is an arbitrary phase). ### Claim 6 (depends on 5) The phased array transmission device according to claim 5, wherein N=2. ### Claim 7 (depends on 1) The phased array transmission device according to claim 1, wherein, while a DC offset correction is being performed in at least one of the transmission branches from among the plurality of transmission branches, a power source for the other transmission branches for which the DC offset correction is not being performed is put into an on state. ### Claim 8 (depends on 1) The phased array transmission device according to claim 1, wherein the transmission branches are provided with: a power amplifier that amplifies, to a predetermined power, a signal that is output from the mixer; and a transmission antenna that transmits, as a radio signal, a signal that is output from the power amplifier, and, while a DC offset correction is being performed in at least one of the transmission branches from among the plurality of transmission branches, a power source for the power amplifiers of the other transmission branches for which the DC offset correction is not being performed is put into an off state. ### Claim 9 A phased array transmission device comprising: a plurality of transmission branches, each being provided with a first DC offset corrector that adds a first correction value to a baseband signal, a phase shifter that applies a phase rotation to an output signal of the first DC offset corrector, a second DC offset corrector that adds a second correction value to an output signal of the phase shifter, a mixer that subjects an output signal of the second DC offset corrector to a frequency conversion to a high frequency band, and a detector that detects, using the baseband signal from prior to the phase rotation, a first DC offset that occurs at a stage prior to the phase shifter; and a correction controller that determines the first correction value on the basis of the first DC offset. ### Claim 10 (depends on 9) The phased array transmission device according to claim 9, wherein the correction controller determines the second correction value in such a way that a second DC offset that occurs at the mixer is removed, after the first DC offset corrector has performed a DC offset correction using the first correction value. ### Claim 11 (depends on 9) The phased array transmission device according to claim 9, wherein, while a DC offset correction is being performed in at least one of the transmission branches from among the plurality of transmission branches, a power source for the other transmission branches for which the DC offset correction is not being performed is put into an on state. ### Claim 12 (depends on 9) The phased array transmission device according to claim 9, wherein the transmission branches are provided with: a power amplifier that amplifies, to a predetermined power, a signal that is output from the mixer; and a transmission antenna that transmits, as a radio signal, a signal that is output from the power amplifier, and, while a DC offset correction is being performed in at least one of the transmission branches from among the plurality of transmission branches, a power source for the power amplifiers of the other transmission branches for which the DC offset correction is not being performed is put into an off state. ### Claim 13 A carrier leak correction method including: phase shifting in which a phase rotation is applied to a baseband signal; DC offset correcting in which a first correction value is added to an output signal of the phase shifting; converting in which an output signal of the DC offset correcting is subjected to a frequency conversion to a high frequency band; and correction controlling in which a second correction value with which a carrier leak component included in an output signal of the converting is minimized, is calculated for each of a plurality of candidates for a phase rotation amount that is set for the phase rotation, and the first correction value is determined on the basis of the second correction value. ### Claim 14 A carrier leak correction method including: first DC offset correcting in which a first correction value is added to a baseband signal; phase shifting in which a phase rotation is applied to an output signal of the first DC offset correcting; second DC offset correcting in which a second correction value is added to an output signal of the phase shifting; converting in which an output signal of the second DC offset correcting is subjected to a frequency conversion to a high frequency band; detecting in which a first DC offset that occurs at a stage prior to the phase shifting is detected using the baseband signal from prior to the phase rotation; and correction controlling in which the first correction value is determined on the basis of the first DC offset.