Abstract: According to one embodiment, a wireless communication device includes a transmitter configured to transmit a first field containing information to identify a plurality of wireless communication terminals, and configured to multiplex and transmit a plurality of second fields in each of which a first frame containing an address of any of the wireless communication terminals is set; and a controller configured to determine, for the first frames, values pertaining to lengths of durations to suppress access to a wireless medium to the wireless communication terminal having an address different from the address contained in each of the first frames. The transmitter is configured to set the values in the first frames, the second fields, or the first field. The controller is configured to determine the values so that the durations have an end at an identical time.

Abstract: According to one embodiment, transmission circuitry transmits power with a first electromagnetic wave in a first frequency band. A processor circuitry executes a carrier sense during a first period, in at least a second frequency band different from the first frequency band. The transmission circuitry transmits power with a second electromagnetic wave in the first frequency band in a second period following the first period, if a wireless signal is not detected by the carrier sense during the first period. The processor circuitry executes the carrier sense during a third period following the first period in the at least the second frequency band, if the wireless signal is detected by the carrier sense during the first period.

Abstract: According to one embodiment, a wireless communication device, includes a receiver configured to receive a first field, receive at least one of a plurality of second fields having been multiplexed and transmitted, and decode the one of the second fields to obtain a frame in a case where first information identifying the wireless communication device is not set in the first field, and a controller configured to suppress access to a wireless medium during a period indicated by a value set in the frame.

Abstract: According to one embodiment, an wireless power transmission apparatus includes a plurality of antennas, a power transmission circuit, a measuring circuit and a control circuit. The power transmission circuit is configured to transmit a beam of a first wireless signal from the plurality of antennas. The measuring circuit is configured to receive a second wireless signal with the plurality of antennas. The control circuit is configured to: detect an object in a direction of the beam based on the second wireless signal received at a plurality of timings; and change a shape of the beam by controlling at least either an amplitude or a phase of the first wireless signal provided to each antenna of the plurality of antennas.

Abstract: According to one embodiment, a wireless communication device, includes a receiver configured to receive a first field, receive at least one of a plurality of second fields having been multiplexed and transmitted, and decode the one of the second fields to obtain a frame in a case where first information identifying the wireless communication device is not set in the first field, and a controller configured to suppress access to a wireless medium during a period indicated by a value set in the frame.

Abstract: According to one embodiment, an electronic apparatus includes a power transmitter, detect circuitry and control circuitry. The power transmitter is configured to transmit a power by an electromagnetic wave of a power transmission frequency band according to a power transmission period. The detect circuitry is configured to detect a power in a frequency band different from the power transmission frequency band. The control circuitry is configured to determine the power transmission period based on a first threshold value, a second threshold value, a third threshold value and a fourth threshold value.

Abstract: According to one embodiment, an electronic apparatus includes a signal detector and processor circuitry. The signal detector is configured to detect communication information based on a wireless signal. The processor circuitry is configured to determine at least one of (1) a first period to wait from a timing of when power transmission is ended to a timing of when power transmission is started, (2) a second period to wait from a timing of when the wireless signal is not detected to a timing of when power transmission is started, and (3) a third period for continuously performing power transmission. The processor circuitry is configured to transmit a power with electromagnetic wave according to at least one of the first period, the second period, and the third period.

Abstract: According to one embodiment, an electronic apparatus communicable with a measurement apparatus includes a power supplier and control circuitry. The power supplier is configured to supply power by an electromagnetic wave. The control circuitry is configured to receive first information on a wireless signal measured by the measurement apparatus and control the electromagnetic wave for power supply based on both the first information and a position of the measurement apparatus.

Abstract: According to one embodiment, an electronic apparatus includes a power transmitter, a receiver and control circuitry. The power transmitter is configured to transmit power to a first electronic apparatus by an electromagnetic waves. The receiver is configured to receive a communication signal wirelessly from a second electronic apparatus. The control circuitry is configured to control power transmitted by the power transmitter, based on at least detection sensitivity of the receiver.

Abstract: According to one embodiment, an electronic apparatus includes controller circuitry, transmitter circuitry, and receiver circuitry. The controller circuitry is configured to judge whether a payload for a first packet comprises retransmission data; set a first PHY header for the first packet, when the payload does not comprise the retransmission data; set a second PHY header for the first packet, when the payload includes the retransmission data, wherein the second PHY header comprises an amount of information larger than an amount of information of the first PHY header; and generate the first packet comprising the payload and either one of the first PHY header or the second PHY header set for the first packet. The transmitter circuitry is configured to transmit the first packet. The receiver circuitry is configured to receive an ACK signal or a NACK signal for the first packet.

Abstract: According to one embodiment, an electronic apparatus includes a first transmitter configured to transmit a first wireless signal of power feeding, to a first terminal; a second transmitter configured to transmit a second wireless signal of power feeding, to the first terminal and controlling circuitry configured to control both the first transmitter and the second transmitter to transmit simultaneously at least a part of the first wireless signal from the first transmitter to the first terminal and the second wireless signal from the second transmitter to the first terminal.

Abstract: An electronic apparatus includes communication circuitry and processing circuitry. The communication circuitry receives first and second wireless signals from a first terminal when the electronic apparatus reaches first and second measurement points. The communication circuitry receives third and fourth wireless signals from a second terminal when the electronic apparatus reaches third and fourth measurement points. The processing circuitry estimates one or more first candidates of a position of the first terminal and one or more second candidates of a position of the second terminal. The processing circuitry specifies the position of the first terminal and the position of the second terminal.

Abstract: According to one embodiment, an electronic apparatus, includes: transmission circuitry configured to transmit a first request of power feeding; power reception circuitry configured to receive a first wireless signal in response to the first request of power feeding, and charge a rechargeable battery with a power from the first wireless signal; and controlling circuitry configured to determine a transmission timing of a second request of power feeding, based on a reception history of the power reception circuitry.

Abstract: An electronic apparatus includes a transmitter circuitry, receiver circuitry, and controller circuitry. The transmitter circuitry is configured to transmit a first wireless signal for a wireless communication to a first terminal via a first frequency. The receiver circuitry is configured to receive a second wireless signal for the wireless communication from the first terminal via the first frequency. The controller circuitry is configured to detect position information of the first terminal based on the second wireless signal and form a beam pattern of radio waves of a second frequency different from the first frequency based on the position information, the beam pattern having directivity to the first terminal. And the transmitter circuitry is further configured to wirelessly supply power to the first terminal via the second frequency during the wireless communication with the first terminal.

Abstract: According to one embodiment, an electronic apparatus includes receiver circuitry and controller circuitry. The receiver circuitry is configured to receive a radio signal from a target apparatus. The controller circuitry is configured to estimate first position information of the target apparatus based on a captured image; and estimate second position information of the target apparatus based on both the first position information and information of the radio signal.

Abstract: An electronic apparatus includes a transmitter circuitry, receiver circuitry, and controller circuitry. The transmitter circuitry is configured to transmit a first wireless signal for a wireless communication to a first terminal via a first frequency. The receiver circuitry is configured to receive a second wireless signal for the wireless communication from the first terminal via the first frequency. The controller circuitry is configured to detect position information of the first terminal based on the second wireless signal and form a beam pattern of radio waves of a second frequency different from the first frequency based on the position information, the beam pattern having directivity to the first terminal. And the transmitter circuitry is further configured to wirelessly supply power to the first terminal via the second frequency during the wireless communication with the first terminal.

Abstract: According to one embodiment, a wireless communication apparatus includes controlling circuitry and transmitter circuitry. The controlling circuitry is configured to divide data into bit strings by a unit of a first number of bits; add at least one padding bit to one of the bit strings according to a difference between a number of bits of the one of the bit strings and the first number of bits, when the one of the bit strings has a number of bits less than the first number of bits; add error correction codes to the bit strings to generate encoded blocks, wherein each of the error correction codes has a second number of bits; combine the encoded blocks to generate encoded frames; and aggregate the encoded frames to generate a transmission packet. The transmitter circuitry is configured to transmit the transmission packet.

Abstract: According to one embodiment, an electronic apparatus includes controller circuitry, transmitter circuitry, and receiver circuitry. The controller circuitry is configured to judge whether a payload for a first packet comprises retransmission data; set a first PHY header for the first packet, when the payload does not comprise the retransmission data; set a second PHY header for the first packet, when the payload includes the retransmission data, wherein the second PHY header comprises an amount of information larger than an amount of information of the first PHY header; and generate the first packet comprising the payload and either one of the first PHY header or the second PHY header set for the first packet. The transmitter circuitry is configured to transmit the first packet. The receiver circuitry is configured to receive an ACK signal or a NACK signal for the first packet.

Abstract: According to one embodiment, an integrated circuit receives first packet scrambled with a first scrambling seed and second packet scrambled with a second scrambling seed, generates inversion data, generate third likelihood information by inverting signs of the first likelihood information or the second likelihood information based on the inversion data, and generates fourth likelihood information based on the third likelihood information and the second or first likelihood information.

Abstract: According to one embodiment, a baseband integrated circuit is configured to: perform division between a first component of a baseband signal modulated by a minimum shift keying scheme and the first component of a predetermined first synchronization word signal; select the division result corresponding to a frequency offset from among a plurality of division results; interpolate the selected division result; and approximate the interpolated division result by a sine wave, and estimate the frequency offset based on an approximated sine wave.