Patents by Inventor Yoshitaka Kihara
Yoshitaka Kihara has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11463285Abstract: A signal analysis apparatus includes a frequency conversion unit 10 that includes a first local oscillator 11 which outputs a first local oscillation signal SLO1 of a frequency fLO1, a first mixer 12 which generates a first spurious signal of a frequency fSP1, a first BPF 13 of a passed center frequency f0, a second local oscillator 14 which outputs a second local oscillation signal SLO2 of a frequency fLO2, and a second BPF 16 of a passed bandwidth W, and that performs frequency conversion of a measured signal SRF of a frequency fRF (center frequency fc), in which the frequency fLO1 and the frequency fLO2 are shifted using a frequency shift amount ?f that does not establish a relationship of ?W/2?|fSP1?f0±fIF2??f|?fIF2?+W/2.Type: GrantFiled: September 8, 2021Date of Patent: October 4, 2022Assignee: ANRITSU CORPORATIONInventors: Shinichi Ito, Shunsuke Hinooka, Yoshitaka Kihara, Mamoru Iwamoto
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Publication number: 20220103402Abstract: A signal analysis apparatus includes a frequency conversion unit 10 that includes a first local oscillator 11 which outputs a first local oscillation signal SLO1 of a frequency fLO1, a first mixer 12 which generates a first spurious signal of a frequency fSP1, a first BPF 13 of a passed center frequency f0, a second local oscillator 14 which outputs a second local oscillation signal SLO2 of a frequency fLO2, and a second BPF 16 of a passed bandwidth W, and that performs frequency conversion of a measured signal SRF of a frequency fRF (center frequency fc), in which the frequency fLO1 and the frequency fLO2 are shifted using a frequency shift amount ?f that does not establish a relationship of ?W/2?|fSP1?f0±fIF2??f|?fIF2?+W/2.Type: ApplicationFiled: September 8, 2021Publication date: March 31, 2022Inventors: Shinichi ITO, Shunsuke HINOOKA, Yoshitaka KIHARA, Mamoru IWAMOTO
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Patent number: 10855571Abstract: A measurement device and a measurement method capable of performing measurement on a device under test while maintaining a desired high data rate even under poor communication conditions such as occurrence of retransmission of a frame from a device under test in a wireless communication connection are provided. The measurement device includes a reception unit 14 that receives a frame transmitted from a DUT 1, a determination unit 16 that determines whether or not a header of the frame has been normally received by the reception unit 14, an acknowledgment transmission unit 13b that transmits the acknowledgment frame to the DUT 1 when the determination unit 16 determines that the header has been normally received by the reception unit 14; and a measurement unit 17 that performs the measurement on the frame determined by the determination unit 16 that the header has been normally received by the reception unit 14.Type: GrantFiled: February 14, 2019Date of Patent: December 1, 2020Assignee: ANRITSU CORPORATIONInventors: Yoshitaka Kihara, Takahiro Kasagi, Custodio Jean-Elaine Garcia, Yuichi Tsuiki
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Publication number: 20190306046Abstract: A measurement device and a measurement method capable of performing measurement on a device under test while maintaining a desired high data rate even under poor communication conditions such as occurrence of retransmission of a frame from a device under test in a wireless communication connection are provided. The measurement device includes a reception unit 14 that receives a frame transmitted from a DUT 1, a determination unit 16 that determines whether or not a header of the frame has been normally received by the reception unit 14, an acknowledgment transmission unit 13b that transmits the acknowledgment frame to the DUT 1 when the determination unit 16 determines that the header has been normally received by the reception unit 14; and a measurement unit 17 that performs the measurement on the frame determined by the determination unit 16 that the header has been normally received by the reception unit 14.Type: ApplicationFiled: February 14, 2019Publication date: October 3, 2019Inventors: Yoshitaka KIHARA, Takahiro KASAGI, Custodio Jean-Elaine GARCIA, Yuichi TSUIKI
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Patent number: 10142866Abstract: In a case where testing of uplink carrier aggregation that is a frequency arrangement in which a primary component carrier and a secondary component carrier are contiguous is performed, a control unit 15 causes a call processing unit 12 to configure a transmission signal of a mobile terminal 2 in such a manner that the transmission signal satisfies a prescribed condition for user data transmission, and causes a wireless signal measurement unit 13 to detect a local oscillation frequency from a band that includes a frequency band in which a primary component carrier and a secondary component carrier are contiguous, using a reception signal that satisfies the prescribed condition for user data transmission.Type: GrantFiled: September 28, 2016Date of Patent: November 27, 2018Assignee: ANRITSU CORPORATIONInventors: Takayuki Awano, Yoshitaka Kihara, Naoki Inoue, Paulo-Jessie Morales
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Publication number: 20170099609Abstract: In a case where testing of uplink carrier aggregation that is a frequency arrangement in which a primary component carrier and a secondary component carrier are contiguous is performed, a control unit 15 causes a call processing unit 12 to configure a transmission signal of a mobile terminal 2 in such a manner that the transmission signal satisfies a prescribed condition for user data transmission, and causes a wireless signal measurement unit 13 to detect a local oscillation frequency from a band that includes a frequency band in which a primary component carrier and a secondary component carrier are contiguous, using a reception signal that satisfies the prescribed condition for user data transmission.Type: ApplicationFiled: September 28, 2016Publication date: April 6, 2017Inventors: Takayuki Awano, Yoshitaka Kihara, Naoki Inoue, Paulo-Jessie Morales
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Patent number: 9413570Abstract: Frequency comparison means compares the levels of uplink (UL) and downlink (DL) frequencies which are designated by frequency designation means. When it is determined that the UL frequency is lower than the DL frequency, heterodyne switching means enables a receiving unit to perform frequency conversion using a lower-side heterodyne system and signal processing is performed, using one baseband signal and the other baseband signal obtained by a quadrature demodulation process as an in-phase component and a quadrature component, respectively. When it is determined that the UL frequency is higher than the DL frequency, the heterodyne switching means enables the receiving unit to perform the frequency conversion using an upper-side heterodyne system and signal processing is performed, using the one baseband signal and the other baseband signal obtained by the quadrature demodulation process as the quadrature component and the in-phase component, respectively.Type: GrantFiled: January 13, 2015Date of Patent: August 9, 2016Assignee: ANRITSU CORPORATIONInventors: Kengo Kikuchi, Shigeharu Arai, Koji Fukazawa, Takaaki Kamisawa, Masayuki Shimizu, Yoshitaka Kihara
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Publication number: 20150215140Abstract: Frequency comparison means compares the levels of uplink (UL) and downlink (DL) frequencies which are designated by frequency designation means. When it is determined that the UL frequency is lower than the DL frequency, heterodyne switching means enables a receiving unit to perform frequency conversion using a lower-side heterodyne system and signal processing is performed, using one baseband signal and the other baseband signal obtained by a quadrature demodulation process as an in-phase component and a quadrature component, respectively. When it is determined that the UL frequency is higher than the DL frequency, the heterodyne switching means enables the receiving unit to perform the frequency conversion using an upper-side heterodyne system and signal processing is performed, using the one baseband signal and the other baseband signal obtained by the quadrature demodulation process as the quadrature component and the in-phase component, respectively.Type: ApplicationFiled: January 13, 2015Publication date: July 30, 2015Inventors: Kengo Kikuchi, Shigeharu Arai, Koji Fukazawa, Takaaki Kamisawa, Masayuki Shimizu, Yoshitaka Kihara
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Patent number: 9020496Abstract: In a system for testing a mobile communication device under test, a calculation part calculates, before a control part starts processing according to a designated measurement sequence, a total value of a data amount to be acquired as an analysis target by a transmission/reception unit in the designated measurement sequence. A determination part determines whether the calculated total value of the data amount exceeds a permissible value which has been set in advance according to a predetermined capacity of a reception data memory. If the determination part determines that the calculated total value exceeds the permissible value, the control part displays the determination result on the display unit.Type: GrantFiled: September 12, 2012Date of Patent: April 28, 2015Assignee: Anritsu CorporationInventors: Keiichi Mineda, Yoshitaka Kihara
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Patent number: 8649737Abstract: To enable addition or changes of functions with changes of communication standards in a mobile communication terminal test system. A mobile communication terminal test system includes a transceiver which has a control unit configured to append input information to acquired waveform data, a signal analysis unit which executes an analysis program, and a signal analyzer which is provided separately from the transceiver. The analysis program has a processing program which is provided for each type of arithmetic processing on the waveform data, a control program which is provided for each communication system, selects one or more processing programs for each test item, and executes the processing programs, and a switching program which specifies a communication system and a test item on the basis of the input information, and selects and executes a control program.Type: GrantFiled: February 29, 2012Date of Patent: February 11, 2014Assignee: Anritsu CorporationInventors: Yoshitaka Kihara, Micael-Lacson Magpayo, Naofumi Naruse
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Publication number: 20130084853Abstract: In a system for testing a mobile communication device under test, a calculation part calculates, before a control part starts processing according to a designated measurement sequence, a total value of a data amount to be acquired as an analysis target by a transmission/reception unit in the designated measurement sequence. A determination part determines whether the calculated total value of the data amount exceeds a permissible value which has been set in advance according to a predetermined capacity of a reception data memory. If the determination part determines that the calculated total value exceeds the permissible value, the control part displays the determination result on the display unit.Type: ApplicationFiled: September 12, 2012Publication date: April 4, 2013Applicant: ANRITSU CORPORATIONInventors: Keiichi MINEDA, Yoshitaka KIHARA
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Publication number: 20120252372Abstract: To enable addition or changes of functions with changes of communication standards in a mobile communication terminal test system. A mobile communication terminal test system includes a transceiver which has a control unit configured to append input information to acquired waveform data, a signal analysis unit which executes an analysis program, and a signal analyzer which is provided separately from the transceiver. The analysis program has a processing program which is provided for each type of arithmetic processing on the waveform data, a control program which is provided for each communication system, selects one or more processing programs for each test item, and executes the processing programs, and a switching program which specifies a communication system and a test item on the basis of the input information, and selects and executes a control program.Type: ApplicationFiled: February 29, 2012Publication date: October 4, 2012Applicant: ANRITSU CORPORATIONInventors: Yoshitaka Kihara, Micael-Lacson Magpayo, Naofumi Naruse