Patents by Inventor Mutsuhito OTA

Mutsuhito OTA 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).

  • Patent number: 9503132
    Abstract: A wireless communication apparatus includes an amplifying unit that amplifies an input signal that includes signals with different frequencies of a first frequency and the second frequency; a measuring unit that measures a level of inter modulation distortion generated in a signal obtained by the input signal being amplified by the amplifying unit; a determining unit that determines whether the level of the inter modulation distortion measured by the measuring unit is equal to or greater than a regulation value that is previously stored; and a control unit that decreases, when a result of the determination obtained by the determining unit indicates that the level of the inter modulation distortion is equal to or greater than the regulation value, a level of a signal input to the amplifying unit.
    Type: Grant
    Filed: July 29, 2015
    Date of Patent: November 22, 2016
    Assignee: FUJITSU LIMITED
    Inventors: Mutsuhito Ota, Setsuya Nagaya, Shinichi Kawai, Yusuke Yamamori
  • Publication number: 20160080010
    Abstract: A wireless communication apparatus includes an amplifying unit that amplifies an input signal that includes signals with different frequencies of a first frequency and the second frequency; a measuring unit that measures a level of inter modulation distortion generated in a signal obtained by the input signal being amplified by the amplifying unit; a determining unit that determines whether the level of the inter modulation distortion measured by the measuring unit is equal to or greater than a regulation value that is previously stored; and a control unit that decreases, when a result of the determination obtained by the determining unit indicates that the level of the inter modulation distortion is equal to or greater than the regulation value, a level of a signal input to the amplifying unit.
    Type: Application
    Filed: July 29, 2015
    Publication date: March 17, 2016
    Inventors: Mutsuhito OTA, Setsuya NAGAYA, Shinichi Kawai, Yusuke Yamamori
  • Patent number: 8982740
    Abstract: In a wireless communication device, in a correction value calculating mode, a control unit flips switches to the “a” sides, a modulation processing unit generates a CW signal as an I channel signal, a DAC converts the digital CW signal into an analog CW signal, an LPF eliminates the high-frequency component from the CW signal, a mixer functions as an up-converter for up-converting the CW signal, a PA amplifies the RF power of the CW signal, a mixer functions as a down-converter for down-converting the CW signal, an ADC converts the analog CW signal into a digital CW signal, a level detecting unit detects the voltage level of the CW signal, a correction value calculating unit calculates a correction value based on the detected voltage level, and a correction value storing unit stores the calculated correction value.
    Type: Grant
    Filed: December 18, 2012
    Date of Patent: March 17, 2015
    Assignee: Fujitsu Limited
    Inventors: Setsuya Nagaya, Shinji Kakizaki, Youji Nakata, Mutsuhito Ota
  • Publication number: 20130258910
    Abstract: In a wireless communication device, in a correction value calculating mode, a control unit flips switches to the “a” sides, a modulation processing unit generates a CW signal as an I channel signal, a DAC converts the digital CW signal into an analog CW signal, an LPF eliminates the high-frequency component from the CW signal, a mixer functions as an up-converter for up-converting the CW signal, a PA amplifies the RF power of the CW signal, a mixer functions as a down-converter for down-converting the CW signal, an ADC converts the analog CW signal into a digital CW signal, a level detecting unit detects the voltage level of the CW signal, a correction value calculating unit calculates a correction value based on the detected voltage level, and a correction value storing unit stores the calculated correction value.
    Type: Application
    Filed: December 18, 2012
    Publication date: October 3, 2013
    Inventors: Setsuya NAGAYA, Shinji KAKIZAKI, Youji NAKATA, Mutsuhito OTA