Nec Corporation

Lenovo Innovations Limited (hong Kong)

Other

Toshiyuki Oga

Masahiro Nomura

Yoshiyuki Takahashi

Takao Ono

Takanobu Gido

Rika Sasaki

A wireless communication system includes a base station and direct wave communication stations that communicate with the base station. At least one of the base station and the direct wave communication stations includes a number-of-bands switching unit that switches, on the basis of a communication state, a number of bands for direct wave communication, by dividing a band for direct wave communication. One of the plurality of direct wave communication stations receives a narrowband carrier in the divided band.

Wireless communication system

A mobile communication system includes a base station, and mobile stations that communicate with the base station. At least one of the base station and the mobile stations includes a number-of-carriers switching unit. The switching units switches, on the basis of a communication state, a ratio of numbers of carriers for downlink communication and uplink communication, by dividing a band of a carrier.

Mobile wireless communication system

Provided is a mobile wireless communication system that improves response immediacy in a wireless communication system using an SCPC communication system. For this purpose, a base station and/or a plurality of mobile stations is provided with a number-of-channels switching means that monitors the communication state to create determination information for determining the necessity of switching the number of channels, and that switches the ratio of the number of channels for downlink communications and that for uplink communications, in a case where a change in the number of channels is necessary on the basis of the determination information.

A transmission device has an inverse fast Fourier transform converter (first circuit) that acquires plural multi-value symbol data each of which is assigned to a dedicated subcarrier, and generates waveform data on the basis of the acquired plural multi-value symbol data, and a digital frequency converter (second circuit) that shifts frequency of the waveform data generated by the inverse fast Fourier transform converter.

OFDM modulator, OFDM transmission device, and OFDM modulation method

A transmission devicehas an inverse fast Fourier transform converter(first circuit) that acquires plural multi-value symbol data each of which is assigned to a dedicated subcarrier, and generates waveform data on the basis of the acquired plural multi-value symbol data, and a digital frequency converter(second circuit) that shifts frequency of the waveform data generated by the inverse fast Fourier transform converter

In an electric power supply system, a plurality of batteries () are connected in series by a switch group (toto), and a higher voltage and a lower voltage are output through a terminal and a VOL terminal, respectively, and are respectively converted in the voltage thereof by two step-down DC-DC inverters (). During a discharge operation upon a serial connection, remaining content of the batteries is measured in a period other than the period of discharge from the batteries (), and the connection mode of the serial connection is controlled based on the remaining content, to control the discharge of the respective batteries up to the discharge capacity.

Electric power supply system

In an orthogonal frequency division multiplex (OFDM) modulated wave transmitter apparatus, a symbol mapping circuit and a serial/parallel (S/P) converter generate an OFDM symbol signal from transmission data. An inverse fast Fourier transform (IFFT) circuit, a parallel/serial (P/S) converting and guard interval (GI) adding circuit, a timing adjusting circuit, a digital/analog (D/A) converter, a frequency converter, a local oscillator and an analog filter generate an OFDM modulated wave signal from the OFDM symbol signal. A power amplifier (PA) control circuit limits a band of the OFDM symbol signal and generates a PS control signal and a PA control signal. A PA designates a voltage supplied from a DC/DC converter as a PS voltage and amplifies and outputs the OFDM modulated wave signal based on the PA control signal.

OFDM modulated wave transmitter apparatus, OFDM modulated wave transmission method, and program

In a mobile radio communication method in which a mobile station moves among a plurality of base stations at high speed, in order to solve a problem of increase in the amount of operation and its related increase in the amount of power consumption and heat emission which is resulted for maintaining good communication quality of communication by the mobile station which moves at high speed to the direction for approaching the base station or moving away from it, it provides detecting means for detecting changes in relative positions to a plurality of base stations, and selecting means for selecting an uplink signal reception base station which receives an uplink signal and selecting one or plural base stations, fluctuation of increase and decrease of which of distance from own mobile station is an opposite manner compared with a case of the uplink signal receiving base station, based on changes in the relative positions detected by said detecting means as a downlink signal transmission base station which transmits a downlink signal.

Mobile station, a mobile radio communication system, and a mobile radio communication method

An information processing terminal system includes an information processing terminal; and a transmitting and receiving unit which is attached to the information processing terminal. The transmitting and receiving unit converts a reception wave signal from a network into a reception analog baseband signal. The transmitting and receiving unit converts the reception analog baseband signal into a reception digital baseband signal in synchronization with a clock. The information processing terminal converts the reception digital baseband signal into a reception data in synchronization with a clock, and a transmission data into a transmission digital baseband signal in synchronization with the clock. The transmitting and receiving unit converts the transmission digital baseband signal into a transmission analog baseband signal in synchronization with the clock. The transmitting and receiving unit converts the transmission analog baseband signal into a transmission modulation wave signal to output to the network.

Data processing terminal system and transmitting and receiving method using the same

A mobile information terminal has a front surface on which a display surface of a display device is arranged and a rear surface on which a plurality of operation keys are arranged. The mobile information terminal further has a half-depressing sensor for detecting that each of the operation keys is half-depressed and/or a touch sensor for detecting that each of the operation keys is touched. A control section executes a processing operation to cause the display device to display an image showing the arrangement of said operation keys and to change an icon which corresponds to a key of operation keys when a control section determines, according to an input signal from the half-depressing sensor or the touch sensor, that the finger of the operator is placed on this key of operation keys.

Mobile information terminal having operation keys and a display on opposite sides

An information processing terminal system includes an information processing terminal (); and a transmitting and receiving unit () which is attached to the information processing terminal. The transmitting and receiving unit () converts a reception wave signal from a network into a reception analog baseband signal. The transmitting and receiving unit () converts the reception analog baseband signal into a reception digital baseband signal in synchronization with a clock. The information processing terminal () converts the reception digital baseband signal into a reception data in synchronization with a clock, and a transmission data into a transmission digital baseband signal in synchronization with the clock. The transmitting and receiving unit () converts the transmission digital baseband signal into a transmission analog baseband signal in synchronization with the clock. The transmitting and receiving unit () converts the transmission analog baseband signal into a transmission modulation wave signal to output to the network.

Growing community of inventors

Tokyo, Japan

Toshiyuki Oga