Oki Electric Industry Co., Ltd.

Hapsmobile Inc.

Softbank Corporation

Thaicom Public Company Limited

Hiwave, Inc.

Yoshihito Shimazaki

Junichi Miyakawa

Hiroji Akahori

Atsushi Yamamoto

Satoru Araki

Akihiko Tajika

Kenichiro Hosoda

Atsushi Shimbo

Akira Ikeda

Manabu Kawabe

Shigeru Ono

Takuro Sato

Makoto Saitou

Sakon Kittivatcharapong

HaeWoon Lee

Yuta Miwa

CheolHoon Lee

Isara Amatayakul

A relay communication station is remotely controlled without increasing communication traffic of a feeder link of communication to be relayed between a communication relay apparatus such as a HAPS located in an upper airspace and a communication network on the ground side or on the sea side. The communication relay apparatusesandcomprise relay communication stationsandthat are respectively mounted on flying objects and relay communications between a terminal apparatus and a communication network via a feeder link for mobile communication, radio communication sectionandthat transmit and receive control information to and from a remote control apparatus via a radio communication line for flight control different from the feeder link for mobile communication, and control sections (cell-optimization processing sectionsand) that respectively control the relay communication stations based on the control information received from the remote control apparatus by the radio communication section.

Cell optimization by remote control via communication line for HAPS flight control

Provided is a flying body comprising an antenna for forming a communication area by a beam irradiated toward the ground to provide wireless communication service for a user terminal in the communication area; and an attachment/detachment part configured to physically attach to and detach from another flying body for combining with and separating from another flying body. Provided is also a flying body comprising an antenna for forming a communication area by a beam irradiated toward the ground to provide wireless communication service for a user terminal in the communication area; a cable having an attachment/detachment part configured to physically attach to and detach from another flying body; a cable communication unit configured to communicate with another flying body via the cable; and an electric power transmission unit configured to transmit electric power with another flying body via the cable.

Flying body and system

Provided is a control apparatus for controlling a plurality of flying bodies including a first flying body having an antenna for forming a communication area by a beam irradiated toward the ground to provide wireless communication service for a user terminal in the communication area. The control apparatus comprises a selection unit configured to select a flying body of a combination target to be combined with the first flying body from the plurality of flying bodies; and a flying body control unit configured to control combination of the first flying body and the flying body of a combination target.

Control apparatus, program, system and control method

A control device is provided which forms a communication area on a ground to control an aircraft having an antenna for providing a radio communication service to a user terminal in the communication area. The control device includes a control unit that makes a plurality of aircrafts fly in formation, and controls the plurality of aircrafts such that the communication area of each of the plurality of aircrafts moves while covering a part of a preset target area and the entire target area is covered by a plurality of the communication areas of the plurality of aircrafts.

Control of formation flight of aircraft and communication area for providing radio communication service

When bandwidth is dynamically allocated for audio communication via satellite communication, newly occurring audio communication can negatively affect the communication quality of the existing audio communication. Provided is a data communication apparatus that communicates via a satellite and includes an allocation control section that allocates in advance, for audio communication via the satellite, a bandwidth that is larger than a bandwidth needed for current audio communication being performed via satellite by at least a predetermined bandwidth. A program causes a computer to function as this data communication apparatus. A satellite communication system includes this data communication apparatus and this satellite.

Data communication apparatus, computer readable medium, and satellite communication system

An object of the present invention is to provide an antenna control system and a method capable of consistently maintaining an optimum orientation point between a donor antenna and an adjacent base station. The antenna control system for receiving a signal from a base station includes a donor antenna including an antenna module disposed by being fixed to an inner side of a window glass and configured with an array antenna; a phase shifter including a plurality of transmission lines; and a phase controller configured to control the phase shifter to change an orientation direction of the antenna module; and a repeater including a measuring module for measuring a reception signal received by the antenna module; an analyzing module for analyzing a signal quality parameter in each orientation direction of the antenna module based on a measurement result of the measuring module; and a generating module for generating an antenna control signal for controlling the orientation direction of the antenna module based on an analysis result of the analyzing module.

Antenna control method and antenna control system

The present invention provides a pulse modulator and a PPM demodulation determining circuit employed in Ultra Wideband (UWB) wireless communications. The pulse modulator comprises high frequency delayers which delay an input pulse, variable gainers each of which amplifies the delayed pulse, and an adder which adds the amplified pulses. The PPM demodulation determining circuit comprises an absolute value converter which absolute value-converts a received signal, integration circuits which individually integrate the absolute value-converted signals, and a comparison/determination unit which compares the integrated signals.

Pulse modulator and PPM demodulation determining circuit employed in ultra wideband wireless communications

A PPM signal demodulator for demodulating a PPM signal transmitted in a UWB radio communication system includes a rectifier for rectifying a received PPM signal to obtain an absolute value signal, integrator and comparators for integrating the absolute value signal for every first, second and third integral times and comparing the integrated values for the integral times, absolute value circuits for converting respective outputs of the integrator and comparators to corresponding absolute values, moving average circuits for moving-averaging respective outputs of the absolute value circuits, a determining circuit for generating demodulation data on the basis of the integrated and compared result by the integrator and comparator, and a main control for generating, on the basis of the outputs of the moving average circuits, integral interval control signals that control the first, second and third integral times to supply them to the respective integrator and comparators.

Demodulator for demodulating pulse position modulated signal

In a mobile communications system, a mobile station communicates with a first base station operating at a first antenna specific weight factor. While the mobile station is both in a coverage area of the first base station and a coverage area of a second base station, the mobile station transmits a control signal to the second base station which causes the second base station to operate at a second antenna specific weight factor which is the same as the first antenna specific weight factor. The mobile station then communicates with the second base station, operating at the second antenna specific weight factor, to complete a handoff operation.

Method and apparatus of performing handoff

A portable wireless LAN terminal device attachable to an external connecting terminal installed in a portable external connection device, such as a portable data terminal device, includes a device body (); means for transmitting and receiving (-) a signal through a wireless LAN circuit, the means for transmitting and receiving being installed the device body (); means for supplying power () to each portion from means for accumulating power installed in the device body () or means for accumulating power attachable to the device body (); a connecting terminal () installed in the device body () and attachable to the external connecting terminal; and first sound producing means (), which is installed in the device body, for producing sound based on the signal received by the means for transmitting and receiving (-).

Wireless LAN terminal device, portable data terminal system, mobile phone, wireless LAN communication method, method for providing service, and method for transferring incoming call

A received signal has been converted from a source symbol rate to another symbol rate by symbol repetition, then interleaved to form frames in which the same symbol sequence is repeated multiple times. The source symbol rate is identified by dividing each frame into various numbers of blocks, and determining whether each such division makes at least a certain proportion of the blocks identical. The source symbols are reproduced by identifying a subset of similar blocks from statistical properties of the blocks, and combining the signal values in the subset of blocks.

Data receiver with symbol rate discrimination and statistical analysis

In a first aspect of the invention, a Viterbi decoding circuit stores comparison result bits in a bit-accessible path memory unit. A back-trace is performed by setting a state value in a shift register, then shifting comparison result bits from the path memory unit into the shift register. A certain number of bits at the shift-in end of this register are supplied as read address bits to the path memory unit. In a second aspect of the invention, a Viterbi decoding circuit has selectors that first select old path metric values and branch metric values, which are added or subtracted to produce candidate path metric values, then select the candidate path metric values, which are subtracted to produce a comparison result bit representing the sign of their difference. These additions and subtractions are performed by the same arithmetic unit.

Viterbi decoding method and circuit with accelerated back-tracing and

According to a first aspect of the invention, an automatic-gain-control circuit, which generates a control signal that controls the gain of a variable-gain element, modifies the control signal to compensate for changes in the gain control characteristic of the variable-gain element. According to a second aspect of the invention, the automatic-gain-control modifies a fixed value which is added to cancel a direct-current offset, the modification being made in response to changes in the gain control characteristic of the variable-gain element.

Growing community of inventors

Kanagawa, Japan

Yoshihito Shimazaki