Patents by Inventor Michiko Satou
Michiko Satou 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: 9667343Abstract: A transmission apparatus of a receiving side to receive a signal transmitted from a transmission apparatus of a transmitting side, the transmission apparatus of the receiving side includes: a first monitor configured to measure an eye pattern indicating a signal waveform transition of the signal transmitted from the transmission apparatus of the transmitting side; a pattern analyzer configured to extract a first feature of the eye pattern measured by the first monitor; and a regulation controller configured to cause the transmission apparatus of the transmitting side to adjust at least one of rising and falling of a signal to be transmitted, based on the first feature extracted by the pattern analyzer.Type: GrantFiled: October 26, 2015Date of Patent: May 30, 2017Assignee: FUJITSU LIMITEDInventors: Kenji Suzuki, Tadashi Saitou, Michiko Satou
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Publication number: 20160156412Abstract: A transmission apparatus of a receiving side to receive a signal transmitted from a transmission apparatus of a transmitting side, the transmission apparatus of the receiving side includes: a first monitor configured to measure an eye pattern indicating a signal waveform transition of the signal transmitted from the transmission apparatus of the transmitting side; a pattern analyzer configured to extract a first feature of the eye pattern measured by the first monitor; and a regulation controller configured to cause the transmission apparatus of the transmitting side to adjust at least one of rising and falling of a signal to be transmitted, based on the first feature extracted by the pattern analyzer.Type: ApplicationFiled: October 26, 2015Publication date: June 2, 2016Inventors: Kenji SUZUKI, Tadashi SAITOU, Michiko SATOU
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Patent number: 8520772Abstract: A communication device that compensates a distortion of a transmission signal, amplifies the compensated transmission signal by an amplifier, and outputs the signal. The device includes a storage unit that stores a transmission characteristic of a transmission power of the communication device, a correcting unit that calculates a power value at a set transmission frequency by referring to the storage unit and that corrects a feedback signal of the transmission signal amplifier by the amplifier based on the calculated power value and a maximum transmission power defined by the communication device, and a calculating unit that calculates a distortion compensation coefficient based on the transmission signal and the feedback signal corrected.Type: GrantFiled: March 3, 2011Date of Patent: August 27, 2013Assignee: Fujitsu LimitedInventors: Kenji Suzuki, Michiko Satou
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Patent number: 8385857Abstract: A wireless communication apparatus configured to amplify a transmission signal at an amplifier and transmit the amplified transmission signal, the wireless communication apparatus includes a memory configured to store a distortion compensation coefficient for compensating a distortion characteristic of the amplifier, and an electrical-power measuring unit configured to measure electrical power of the transmission signal. The wireless communication apparatus includes a gain control unit configured to calculate a gain adjustment value for correcting the distortion compensation coefficient stored in the memory based on a power value measured by the electrical-power measuring unit, and a distortion-compensation processing unit configured to perform distortion compensation on the transmission signal based on the distortion compensation coefficient stored in the memory and the gain adjustment value.Type: GrantFiled: May 14, 2010Date of Patent: February 26, 2013Assignee: Fujitsu LimitedInventors: Kenji Suzuki, Toshikazu Tsuchiya, Michiko Satou
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Publication number: 20110222630Abstract: A communication device that compensates a distortion of a transmission signal, amplifies the compensated transmission signal by an amplifier, and outputs the signal. The device includes a storage unit that stores a transmission characteristic of a transmission power of the communication device, a correcting unit that calculates a power value at a set transmission frequency by referring to the storage unit and that corrects a feedback signal of the transmission signal amplifier by the amplifier based on the calculated power value and a maximum transmission power defined by the communication device, and a calculating unit that calculates a distortion compensation coefficient based on the transmission signal and the feedback signal corrected.Type: ApplicationFiled: March 3, 2011Publication date: September 15, 2011Applicant: FUJITSU LIMITEDInventors: Kenji Suzuki, Michiko Satou
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Publication number: 20110124304Abstract: A transmission apparatus performs distortion compensation on a power amplifier using a distortion compensator that includes an adaptive equalizer. The transmission apparatus includes a filter coefficient storage unit that stores filter coefficients that are each set in a digital filter of the adaptive equalizer; a filter coefficient setting unit that selects a filter coefficient from the filter coefficient storage unit according to a feedback signal from the power amplifier; an adjustment value storage unit that stores adjustment values in association with transmission frequencies, the adjustment values each being used by the filter coefficient setting unit to select the filter coefficient; and an initial value setting unit that reads an adjustment value corresponding to a transmission frequency, which is set in the transmission apparatus, from the adjustment value storage unit and sets the read adjustment value as an initial value of the adjustment value used for selecting the filter coefficient.Type: ApplicationFiled: January 31, 2011Publication date: May 26, 2011Applicant: FUJITSU LIMITEDInventors: Toshikazu Tsuchiya, Kenji Suzuki, Michiko Satou, Akira Toyomane
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Publication number: 20100304694Abstract: A wireless communication apparatus configured to amplify a transmission signal at an amplifier and transmit the amplified transmission signal, the wireless communication apparatus includes a memory configured to store a distortion compensation coefficient for compensating a distortion characteristic of the amplifier, and an electrical-power measuring unit configured to measure electrical power of the transmission signal. The wireless communication apparatus includes a gain control unit configured to calculate a gain adjustment value for correcting the distortion compensation coefficient stored in the memory based on a power value measured by the electrical-power measuring unit, and a distortion-compensation processing unit configured to perform distortion compensation on the transmission signal based on the distortion compensation coefficient stored in the memory and the gain adjustment value.Type: ApplicationFiled: May 14, 2010Publication date: December 2, 2010Applicant: FUJITSU LIMITEDInventors: Kenji Suzuki, Toshikazu Tsuchiya, Michiko Satou
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Publication number: 20090291653Abstract: A radio transmission apparatus performs peak suppression processing in the two stages of pre-peak suppression processing and post-peak suppression processing. The gain adjustment processing of transmission power is performed in the two stages of coarse gain adjustment processing, prior to the pre-peak suppression processing, and fine gain adjustment processing prior to the post-peak suppression processing. The fine gain adjustment processing has a smaller adjustment step width than the coarse gain adjustment processing, and can adjust the transmission power in response to a small variation of the transmission power. In the pre-peak suppression processing, a peak suppression value corresponding to the gain set by the coarse gain adjustment processing is set on the basis of each value being preset in a table for each transmission power value. In the post-peak suppression processing, the peak suppression value corresponding to the gain modified by the fine gain adjustment processing is obtained by calculation.Type: ApplicationFiled: December 23, 2008Publication date: November 26, 2009Applicant: FUJITSU LIMITEDInventors: Kenji Suzuki, Toshikazu Tsuchiya, Michiko Satou
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Publication number: 20090104882Abstract: A radio transmission apparatus does not update the distortion compensation coefficient for a certain period, which is shorter than the transmission period, after the transmission period start timing. Instead, update operation of the distortion compensation coefficient is carried out after the lapse of a certain period from the start timing. Further, in order to shorten the convergence time of the distortion compensation coefficient, the radio transmission apparatus performs interpolation processing of the distortion compensation coefficient. The distortion compensation coefficient is given to a two-dimensional coordinate (address): one is the power level of an input transmission signal and the other is the difference of power between the input transmission signal and a feedback signal.Type: ApplicationFiled: October 1, 2008Publication date: April 23, 2009Applicant: FUJITSU LIMITEDInventors: Kenji SUZUKI, Toshikazu TSUCHIYA, Michiko SATOU, Akira TOYOMANE