Ntt Docomo, Inc.

Ntt Mobile Communications Network, Inc.

Tohoku University

Tomoyuki Ohya

Toshio Miki

Hiroki Harada

Nobuhiko Naka

Tamami Maruyama

Tatsuo Furuno

Yasuhiro Oda

Jiyun Shen

Hiromasa Fujii

Toshiro Kawahara

Takahiro Asai

Satoru Adachi

Kei Kikuiri

Shunji Miura

Yukihiko Okumura

Koji Maeda

Takeshi Yoshimura

Ngoc Hao Tran

Yoshinori Miki

Takashi Suzuki

Minoru Etoh

Akira Ishii

Hirohito Suda

Takatoshi Sugiyama

Shinji Uebayashi

Shinichi Mori

Kengo Yagyu

Takashi Ueda

Hosei Matsuoka

Yoshifumi Yonemoto

Hiroto Yasuda

Kunio Sawaya

Hidetoshi Ueno

Qiang Chen

Yutaka Ohto

Hirofumi Takagi

Qiaowei Yuan

Yasuyo Yasuda

Masahito Saigusa

Jianfeng Li

Yoshinobu Nakamura

Shiwei Qu

A propagation path estimation method using an imaging method according to the invention includes a step of, in a case where a reflectarray which causes reflection and scattering in a different direction (&#x3b8;&#x2212;&#x3b7;)&#xb0; from a specular reflection direction &#x3b8;&#xb0; exists on a propagation path from a transmission point to a reception point RX of the radio wave, calculating a virtual reception point VRX by rotating the reception point RX about a rotation center point O, and estimating the propagation path by using the virtual reception point VRX.

Propagation path estimation method and program and apparatus using the same

A propagation path estimation method using an imaging method according to the invention includes a step of, in a case where a reflect array(structure) which causes reflection and scattering in a predetermined direction (&#x3b8;-&#x3b7;)&#xb0; different from a specular reflection direction &#x3b8;&#xb0; exists on a propagation path, rotating the reflect arrayby &#x3b7;/2&#xb0; about a rotation center O to set a virtual rotated reflect array(virtual structure), and estimating the propagation path by using the virtual rotated reflect array

The present invention provide a transmitting/receiving device that includes a sensing period information setting part for, in an interfering system that shares at least a part of a frequency band with an interfered system, setting sensing period information that shows a sensing period for a signal using a shared frequency band; and a transmission prohibition period information notifying part for notifying a terminal in the interfering system of transmission prohibition period information for prohibiting transmission processing in the interfering system until an end of the sensing period, a maximum transmission period for one transmission by the terminal in the interfering system prior to a start point of the sensing period.

Transmitting/receiving device, wireless terminal device and wireless communication method for suppression of intra-system interference

An apparatus having multiple mushroom structures is disclosed. Each of the multiple mushroom structures includes: a ground plate; a patch provided parallel to the ground plate with a separation of a distance to the ground plate, wherein a distance between a ground plate and a patch in a certain mushroom structure is different from a distance between a ground plate and a patch in a different mushroom structure.

Apparatus having mushroom structures

An apparatus having multiple mushroom structures is disclosed. Each of the multiple mushroom structures including: a ground plate; a first patch provided parallel to the ground plate with a separation of a distance to the ground plate; and a second patch provided parallel to the ground plate with a separation of another distance to the ground plate, which another distance being different from the distance from the first patch to the ground plate, wherein the second patch is a passive element which is capacitatively coupled with at least the first patch.

A reflectarray, including: a substrate; and a plurality of patches formed on each of areas into which a principal surface of the substrate is divided, wherein the plurality of patches are formed by including a gap.

Reflectarray

An apparatus having multiple mushroom structures is disclosed. Each of the multiple mushroom structures includes: a ground plate; a first patch provided parallel to the ground plate with a separation of a distance to the ground plate; and a second patch provided parallel to the ground plate with a separation of another distance to the ground plate, which another distance being different from the distance from the first patch to the ground plate, wherein the second patch is a passive element which is capacitatively coupled with at least the first patch.

The invention has a step where a transmitting station in a second radio communication system determines whether transmission of a second radio communication system signal using a shared frequency band is possible or not based on load information of a first radio communication system broadcast from a base station in the first radio communication system, a step where the transmitting station in the second radio communication system calculates predicted interference power caused in a receiving station in the first radio communication system by the second radio communication system signal transmitted using the shared frequency band, and a step where the base station in the first radio communication system increases an allowable interference level of a first radio communication system signal transmitted using the shared frequency band based on the predicted interference power broadcast from the transmitting station in the second radio communication system.

Radio station, transmitting station, and frequency band sharing method

A relay apparatus is disclosed for relaying a signal from a transmitter to a receiver in a MIMO (Multiple Input Multiple Output) based communication system, comprising: a power difference determination unit configured to determine a difference of reception levels between a direct wave and a relayed wave based on positional relationship among the transmitter, the relay apparatus and the receiver, the direct wave traveling from the transmitter to the receiver without the relay apparatus, the relayed wave traveling from the transmitter to the receiver via the relay apparatus; a gain determination unit configured to determine an amplification gain of the relay apparatus to make the difference smaller; and a transmitting unit configured to amplify the signal from the transmitter at the determined amplification gain and transmit the amplified signal to the receiver.

Relay apparatus and relay method

Disclosed is a signal generation device that employs a transmission method using inverse Fourier transform. The signal generation device includes: a modulation unit which modulates transmission data to obtain modulation data; a serial-parallel conversion unit which converts the modulation data input in series to parallel data of a predetermined size smaller than the size of inverse Fourier transform; a duplication unit which selects and duplicates all or a portion of the parallel data to obtain duplication data; a first time-axis shift unit which shifts the duplication data along the time axis to obtain time-axis shift data; and an inverse Fourier transform unit which carries out inverse Fourier transform on the parallel data obtained by the serial-parallel conversion unit and the time-axis shift data obtained by the first time-axis shift unit.

Signal generation device and signal generation method

When a frequency band is shared between a large cell system having a large cell base station and a small cell system having a small cell base station, the large cell base station dynamically controls dedicated resources for the large cell base station and shared resources for both the large cell base station and the small cell base station based on predetermined information, broadcasts allocation information of dedicated resources for the large cell base station and shared resources for both the large cell base station and the small cell base station, to the small cell base station belonging to the own cell, and the small cell base station belongs to at least one large cell base station and determines resource assignment in the own cell based on the resource allocation information broadcast from the large cell base station.

Radio communication method and radio base station

A signal detection apparatusfor determining whether a detection target signal is included in a received radio signal, includes: a waveform feature amount calculation unitconfigured to calculate a waveform feature amount Rrepresenting a waveform feature; a test statistic calculation unitconfigured to calculate test statistic Zof each detection target signal by using the waveform feature amount; and a signal decision unitconfigured to determine presence or absence of each detection target signal by comparing the test statistic Zof each detection target signal with a threshold &#x393;, wherein, under a condition where a specific detection target signal is removed, the test statistic calculation unit calculates a test statistic for a detection target signal which is not removed, and the signal decision unit determines presence or absence of the detection target signal by comparing the calculated test statistic with the threshold.

Signal detection apparatus and signal detection method for use in radio station of radio communication system

It is provided a voice activity decision apparatus capable of accurately performing the decision on the state being associated with a sound interval or a silence interval also in terms of the input signal having many aperiodic components and/or plural mixed different periodic components. The apparatuscomprises: an autocorrelation calculating unitfor calculating autocorrelation values of an input signal; a delay calculating unitfor calculating plural delays at which autocorrelation values calculated by the autocorrelation calculating unitbecome maximums; a noise deciding unitfor deciding whether the input signal is a noise or not based on the plurality of delays calculated by the delay calculating unit; and an activity decision unitfor performing the activity decision in terms of the input signal based on results of decision by the noise deciding unitand the input signal.

Apparatus and method for voice activity detection

A radio communications system including a network connecting radio station and a counterparty radio station is disclosed, the network connecting radio station being a radio station connected to a network and the counterparty radio station being in radio communications with the network connecting radio station. In the system, the network connecting radio station includes an information obtaining unit; an information reporting unit; and a radio resource parameter determining unit. The counterparty radio station includes a waveform information extracting unit which calculates a measured value, for each of one or more waveform feature amounts reported from the network connecting radio station; and a received status reporting unit which reports, to the network connecting radio station, the measured value of the waveform feature amount calculated at the waveform information extracting unit.

Radio communications system and radio communications method

Growing community of inventors

Yokohama, Japan

Tomoyuki Ohya