Abstract: 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.

Abstract: One aspect of the present invention relates to a controller for a radio station. The controller includes an information acquisition unit acquiring radio communication state information on another radio station different from the radio station via a connected backbone network, the radio communication state information including frequency information and waveform feature information, a waveform information extraction unit calculating a waveform feature based on the waveform feature information, the waveform feature indicating whether a received radio signal includes the radio signal transmitted from the other radio station, and a radio resource parameter determination unit determining whether signal transmission from the radio station is available and specify a radio resource to be used for the signal transmission based on the frequency information, the waveform feature information and/or the calculated waveform feature.

Abstract: A radio communication control device includes a radio parameter update determination portion, a transmission power value change portion and a radio parameter update portion. The radio parameter update determination portion determines whether or not to update a radio parameter relating to at least one of a communication frequency and transmission power to a new radio parameter. The transmission power value change portion performs a transmission power change process to change a transmission power value during data transmission to a radio communication station to a smaller value in stages at predetermined intervals when the radio parameter update determination portion determines to update the radio parameter to the new radio parameter. A radio parameter update portion updates the radio parameter to the new radio parameter when the transmission power value change portion changes the transmission power value to a preset lower limit or less.

Abstract: 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.

Abstract: A reflectarray according to the present invention formed by arranging a plurality of mushroom structures on a ground plane and each of the mushroom structures is formed by one quadrilateral patch and a via configured to short the patch and the ground plane. The adjacent vias are arranged to have equal intervals in a vertical direction of the ground plane. A size of each gap between the adjacent patches is adjusted so that a value of a reflection phase of a reflected wave from can of the patches is set to a desired value.

Abstract: 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.

Abstract: 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.

Abstract: A reflector apparatus includes a reflector configured to reflect a directional beam transmitted from an array antenna of a radio base station to the reflector apparatus, a signal receiving unit configured to receive a training signal transmitted from the radio base station, a weight generating unit configured to generate an optimum weight of the directional beam transmitted from the radio base station based on the training signal reception result by the signal receiving unit and a control signal transmitting unit configured to transmit weight information indicating the optimum weight generated by the weight generating unit to the radio base station.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A signal detection apparatus 23 for determining whether a detection target signal is included in a received radio signal, includes: a waveform feature amount calculation unit 31 configured to calculate a waveform feature amount Rx? representing a waveform feature; a test statistic calculation unit 32 configured to calculate test statistic Zx? of each detection target signal by using the waveform feature amount; and a signal decision unit 33 configured to determine presence or absence of each detection target signal by comparing the test statistic Zx? of each detection target signal with a threshold ?, 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.

Abstract: 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.

Abstract: A radio base station determines a communication mode for each radio communication terminal from among a direct mode for communicating without via a relay apparatus, a relay mode for communicating via the relay apparatus by using a directional beam transmitted between the radio base station and the relay apparatus, and a combined mode for communicating by combining the direct mode and the relay mode based on the reception power information acquired from each radio communication terminal, and communicates with the each radio communication terminal by using the communication mode determined for the each radio communication terminal.

Abstract: To provide a data transmitter-receiver bidirectional transmitting system, and data transmitting-receiving method capable of reducing influences of a transmission delay when performing bidirectional communication with an other-communication-party apparatus in an environment in which various states are dynamically changed depending on time. A data obtaining portion 11 of a terminal 10 obtains positional directional information D(Tn) and a time information obtaining portion 12 obtains time information Tn. The terminal 10 stores D(Tn) and Tn in a memory portion 13 and a transmitting portion 15 transmits D(Tn) and Tn to a server 20. A data generating portion 21 of the server 20 generates stereophonic data S(Tn) by using D(Tn), a time information copying portion 22 copies Tn, a transmitting portion 24 transmits S(Tn) and Tn to the terminal 10.

Abstract: 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.

Abstract: One aspect of the present invention relates to a controller for a radio station. The controller includes an information acquisition unit acquiring radio communication state information on another radio station different from the radio station via a connected backbone network, the radio communication state information including frequency information and waveform feature information, a waveform information extraction unit calculating a waveform feature based on the waveform feature information, the waveform feature indicating whether a received radio signal includes the radio signal transmitted from the other radio station, and a radio resource parameter determination unit determining whether signal transmission from the radio station is available and specify a radio resource to be used for the signal transmission based on the frequency information, the waveform feature information and/or the calculated waveform feature.

Abstract: The present invention intends to render quantization noise virtually imperceptible for a user and to prevent reduction in frequency resolution and reduction in encoding efficiency.

Abstract: A data receiving apparatus has a unidirectional channel receiver for receiving segmental data forming an electronic file, through a unidirectional channel; a file assembler for restoring the electronic file, based on the segmental data received by the unidirectional channel receiver; a channel information memory for acquiring location information for specifying a location of the electronic file; and a bidirectional channel transmitter/receiver for establishing a bidirectional channel when there arises a need for retransmission of the electronic file, for sending a request for transmission of the electronic file to a data transmitting device specified by the location information, through the bidirectional channel, and for receiving the electronic file through the bidirectional channel.