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Kentaro Nishimori, Keizo Cho, Yasushi Takatori, Toshikazu Hori: Adaptive array antenna system. Nippon Telegraph and Telephone Corporation, Arent Fox PLLC, May 11, 2004: US06735182 (37 worldwide citation)

In an array antenna used in a transceiver in a time division communication system such as TDD (Time Division Duplex) system, amplitude and phase of each antenna element are calibrated in a transceiver itself during actual communication without using external information. A first transmitter (


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Yasushi Takatori, Keizo Cho, Kentaro Nishimori, Toshikazu Hori: Adaptive array antenna system. Nippon Telegraph and Telephone Corporation, Arent Fox Kintner Plotkin & Kahn PLLC, September 18, 2001: US06292135 (35 worldwide citation)

An adaptive array antenna system for stable directivity control and waveform equalization even under poor multipath environment is provided. An output of antenna elements (A


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Yasushi Takatori, Keizo Cho, Toshikazu Hori, Kentaro Nishimori: Adaptive antenna control method and adaptive antenna transmission/reception characteristic control method. Nippon Telegraph and Telephone Corporation, Blakely Sokoloff Taylor & Zafman, November 27, 2007: US07302232 (4 worldwide citation)

An adaptive antenna control method is used for a radio communication system built by a plurality of radio base stations and a plurality of terminal stations capable of communicating with the radio base stations. Each radio base station includes an adaptive antenna having a plurality of antenna eleme ...


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Jun Mashino, Takatoshi Sugiyama, Kentaro Nishimori, Kengo Nagata, Yusuke Asai: Wireless communication system, interference cancelling station, and interference cancelling method. Nippon Telegraph and Telphone Corporation, Harness Dickey & Pierce, February 5, 2013: US08369789 (1 worldwide citation)

An interference cancelling station ICS includes a transmission weight factor calculating unit calculating a transmission weight factor w2 and an interference cancelling data signal transmitting unit generating an interference cancelling data signal by multiplying, by the transmission weight factor w ...


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Tomoki Murakami, Takeo Ichikawa, Riichi Kudo, Yasushi Takatori, Masato Mizoguchi, Takefumi Hiraguri, Kentaro Nishimori: Radio communication method, radio communication system, radio base station, and radio terminal station. Nippon Telegraph and Telephone Corporation, Harness Dickey & Pierce, July 28, 2015: US09094973

This radio communication method is used to perform spatial multiplexing communication between cells in the overlap cell environment. In the MU-MIMO overlap cell environment, when a null is formed between a radio base station and a radio terminal station belonging to different cells, a first set of a ...


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Yasushi Takatori, Keizo Cho, Toshikazu Hori, Kentaro Nishimori: Adaptive antenna control method and adaptive antenna transmission/reception characteristic control method. Nippon Telegraph and Telephone Corporation, Blakely Sokoloff Taylor & Zafman, December 13, 2011: US08078113

An adaptive antenna control method is used for a radio communication system built by a plurality of radio base stations and a plurality of terminal stations capable of communicating with the radio base stations. Each radio base station includes an adaptive antenna having a plurality of antenna eleme ...


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Tomoki Murakami, Takeo Ichikawa, Riichi Kudo, Yasushi Takatori, Masato Mizoguchi, Takefumi Hiraguri, Kentaro Nishimori: Radio communication method, radio communication system, radio base station, and radio terminal station. Nippon Telegraph and Telephone Corporation, Harness Dickey & Pierce, September 9, 2014: US08830965

This radio communication method is used to perform spatial multiplexing communication between cells in the overlap cell environment. In the MU-MIMO overlap cell environment, when a null is formed between a radio base station and a radio terminal station belonging to different cells, a first set of a ...


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Jun Mashino, Takatoshi Sugiyama, Kentaro Nishimori: Directivity control system, control device, cooperative station device, reception station device, and method of controlling directivity. Nippon Telegraph and Telephone Corporation, Harness Dickey & Pierce, October 8, 2013: US08554149

A directivity control system includes a first reception station device which receives an interference signal and a desired signal; a cooperative station device disposed at a different place from the first reception station device, which receives a signal using an antenna; and a control device which ...


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Kentaro Nishimori, Keizo Cho, Yasushi Takatori, Toshikazu Hori: Adaptive array antenna transceiver apparatus. Robert E Krebs Esq, Burns Doane Swecker & Mathis, June 28, 2001: US20010005685-A1

An adaptive array antenna transceiver apparatus provides: a local signal generator 24 that outputs a signal having a frequency that corresponds to the difference between the reception frequency and the transmitting frequency; a coupler 15 that separates and extracts a part of the signals from the ou ...