Patents by Inventor Kengo Horikoshi

Kengo Horikoshi 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).

  • Publication number: 20150372766
    Abstract: An increase in circuit scale is suppressed and a phase variation caused in a transmission path or the like is compensated for.
    Type: Application
    Filed: February 13, 2014
    Publication date: December 24, 2015
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Mitsuteru YOSHIDA, Etsushi YAMAZAKI, Seiji OKAMOTO, Hiroyuki UZAWA, Kengo HORIKOSHI, Koichi ISHIHARA, Takayuki KOBAYASHI, Yoshiaki KISAKA, Masahito TOMIZAWA, Naoki FUJIWARA, Tomoyoshi KATAOKA, Kazushige YONENAGA
  • Publication number: 20150341138
    Abstract: The estimation of an amount of chromatic dispersion using a training signal sequence is possible. A transmission method includes: a training signal sequence generation step of generating, as training signal sequences, a plurality of signal sequences having power concentrated in a plurality of frequency bands, the power concentrated at different frequency bands; a training signal sequence selection step of selecting at least one training signal sequence from among the plurality of training signal sequences generated in the training signal sequence generation step, a signal multiplexing step of generating a signal sequence obtained by time-division multiplexing the training signal sequence selected in the training signal sequence selection step with a transmission data sequence, and an electrical-to-optical conversion step of transmitting the signal sequence generated in the signal multiplexing step as an optical signal.
    Type: Application
    Filed: January 15, 2014
    Publication date: November 26, 2015
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Koichi ISHIHARA, Masato MIZOGUCHI, Tomoki MURAKAMI, Tomoyoshi KATAOKA, Yoshiaki KISAKA, Tadao NAKAGAWA, Etsushi YAMAZAKI, Seiji OKAMOTO, Kengo HORIKOSHI, Masahito TOMIZAWA, Riichi KUDO
  • Publication number: 20150333838
    Abstract: An optical receiving device receives an optical signal that has been modulated by means of phase modulation or quadrature amplitude modulation, converts the received optical signal into an electrical signal using coherent detection, and performs phase compensation on the converted received signal, and includes: a carrier phase estimation unit that estimates carrier phase errors in a received symbol string obtained from the received signal; a gain adjustment unit that performs gain adjustment on symbols input into the carrier phase adjustment unit; a phase cycle slip reduction unit that, by performing statistical processing on an output from the carrier phase estimation unit, detects general noise that causes a phase cycle slip, and reduces the phase cycle slip; and a phase compensation circuit that compensates carrier phase errors contained in the received signal using an output from the carrier phase estimation unit.
    Type: Application
    Filed: January 24, 2014
    Publication date: November 19, 2015
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Kengo HORIKOSHI, Kohki SHIBAHARA, Etsushi YAMAZAKI, Mitsuteru YOSHIDA, Koichi ISHIHARA, Takayuki KOBAYASHI, Yoshiaki KISAKA, Takuya OHARA, Masahito TOMIZAWA, Tomoyoshi KATAOKA
  • Patent number: 8977141
    Abstract: A parameter of an adaptive filter is optimized so that inter-symbol interference having an amount corresponding to an inserted fixed filter remains.
    Type: Grant
    Filed: February 7, 2012
    Date of Patent: March 10, 2015
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Kengo Horikoshi, Etsushi Yamazaki, Takayuki Kobayashi, Eiji Yoshida, Yutaka Miyamoto
  • Publication number: 20130308960
    Abstract: A parameter of an adaptive filter is optimized so that inter-symbol interference having an amount corresponding to an inserted fixed filter remains.
    Type: Application
    Filed: February 7, 2012
    Publication date: November 21, 2013
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Kengo Horikoshi, Etsushi Yamazaki, Takayuki Kobayashi, Eiji Yoshida, Yutaka Miyamoto