Sumitomo Electric Industries, Limited

Kyoto University

Yoji Okada

Takashi Yamamoto

Yoshizo Tanaka

Hideaki Sakai

Kazunori Hayashi

Shigeru Tanaka

Kenichi Murakami

Hirotsugu Yamamoto

Tadashi Araki

Sei Teki

Tomohiro Miyasaka

Masayuki Ariyoshi

Mariko Sekiguchi

Yafei Hou

Kiyoshi Kobayashi

Kazuto Yano

A management system includes a plurality of sensors installed in a predetermined area, and a management device. The management device includes: an acquisition unit configured to acquire sensor information wirelessly transmitted from the plurality of sensors; an accumulation unit configured to accumulate the acquired sensor information; a determination unit configured to perform abnormality determination regarding the predetermined area by use of the sensor information; a notification unit configured to notify a content based on a result of the determination by the determination unit; and a display control unit capable of performing a control of temporally displaying a content regarding the predetermined area, on the basis of the sensor information acquired by the acquisition unit.

Management system, management device, management method, and management program

Provided is an information management device including: a communication information obtaining unit configured to obtain communication information about a communication state in an internal network inside a building; and an update determination unit configured to determine a start of updating process by an information updating unit, based on the communication information obtained by the communication information obtaining unit, wherein the information updating unit obtains information from an external network outside the building and performs the updating process for storing the obtained information as local information into a storage device which is accessible, not via the external network, by a terminal device connected to the internal network.

Information management device, local network system, information management method, and information management program

A base station device performs switching of its transmission power distribution in accordance with a transmission power distribution switching timing of another base station device. The base station device includes a control unitthat controls transmission power distribution in the frequency domain, and a detection unitthat detects a switching timing at which another base station device switches transmission power distribution. The control unitchanges its transmission power distribution at a power distribution switching timing in the another base station device or a timing near the switching timing. Accordingly, inter-cell interference is prevented.

Base station device

While a clock generated by a built-in clock generator is used as a reference signal for determining a carrier frequency of a transmit signal, carrier frequency synchronization is achieved between base stations. A base station device is configured to perform wireless communication with a terminal device. In the base station device, accuracy of a carrier frequency of an OFDM signal is affected by accuracy of a clock frequency generated by a built-in clock generator. The base station device receives an OFDM signal transmitted from another base station device while transmission to the terminal device is stopped, estimates a carrier frequency offset of the OFDM signal, and corrects a carrier frequency of an OFDM signal to be transmitted to the terminal device.

Base station device for wireless communication of OFDM signal including a synchronization control unit

To reduce the affections of noises having greater instantaneous powers than received signals. A receiver of block transmission scheme, in which signal blocks from a transmitting end are received and equalization is performed for each of the received signal blocks, comprises a local noise detecting unit detecting a local noise locally existing in a received signal block and having a greater amplitude than the signals; a local noise eliminating unit generating a local-noise-eliminated received signal block in which the signals in the range where the local noise is existent within the received signal block have been eliminated together with the local noise; and an equalizer that performs an equalization based on the local-noise-eliminated received signal block.

Receiver, transmitter, transmission system, and transmission method

To reduce the influence of inter-block interference even when the order number of the channel (physically corresponding to the impulse response length of the channel) is larger than the CP length. A receiverfor a transmission system using a block including a plurality of symbols, comprises a transfer function estimating partwhich estimates a transfer function of a channel, and an inter-block interference component generating partwhich generates a replica of an inter-block interference component from a previous block to a current block in accordance with the transfer function h estimated in the transfer function estimating partand a received signal s(n&#x2212;1) of the previous block, wherein the inter-block interference component of a received signal is reduced by using the replica of the inter-block interference component.

Receiver, transmission method and transmission system

Growing community of inventors

Osaka, Japan

Yoji Okada