Kyocera Corporation

Kddi Corporation

Tohru Sunaga

Kugo Morita

Akinori Iwabuchi

Masato Fujishiro

Chiharu Yamazaki

Fangwei Tong

Shigeru Kimura

Atsuhisa Inakoshi

Yasuyuki Irie

Shi Song

A mobile communication system is a mobile communication system that performs communication between a base station and a user terminal. When a directivity is formed to transmit a radio signal, the base station transmits a first radio signal including identification information to identify the formed directivity and a reference signal. The user terminal receives the first radio signal and transmits a second radio signal including quality information when receiving the reference signal and the identification information. The base station receives the second radio signal and determines the directivity to be formed based on the identification information and the quality information.

Mobile communication system, base station, and user terminal

A mobile communication system according to the embodiment supports cellular communication in which a data path passes through a network and D2D communication that is direct device-to-device communication in which a data path does not pass through the network. A frequency division multiplexing scheme is applied to the cellular communication and a code division multiplexing scheme is applied to the D2D communication. The network assigns a spread code having orthogonality to a user terminal in response to a request from the user terminal. The user terminal performs the D2D communication by using the spread code assigned by the network.

Mobile communication system, user terminal, and base station

A wireless communication system includes: a base station; a first wireless communication terminal that receives a first signal from the base station; and a second wireless communication terminal that receives a second signal from the base station. The first signal is to be used by the second wireless communication terminal. The first wireless communication terminal includes: a transmitting unit that transmits the first signal to the second wireless communication terminal. The second wireless communication terminal includes: a receiving unit that receives the first signal from the first wireless communication terminal; and a signal synthesizing unit that receives the first signal from the receiving unit and performs at least one synthesis based on the first signal and the second signal.

Wireless communication system, wireless communication terminal, and wireless communication method

A wireless communication system, a wireless transmitting apparatus, and a wireless receiving apparatus which can be applied to all types of light sources and can be applied to a variety of fields, provided with a medium forming an information transmission source, a general light source made of for example a lamp or the sun or another natural light source or artificial light source, a wireless transmitting apparatus for making the polarization of the light from the light source uniform and controlling the polarization plane of an infrared ray, visible ray, UV ray, or other light (modulating the light in polarization) so as to superimpose other information invisible to the human eye on visual information due to general reflected light and transmitting the same as an optical wireless signal, and a wireless receiving apparatus for receiving the optical wireless signal transmitted from the wireless transmitting apparatus and able to determine a change in orientation of the polarization plane of the light as information of the signal.

Wireless communication system, wireless transmitting apparatus, and wireless receiving apparatus

A wireless communication method includes: transmitting an estimation signal from a first communication device with a first plurality of antenna elements to a second communication device with a second plurality of antenna elements at a training phase for synchronization in a first type of wireless communication using an adaptive array system between the first and second communication devices; detecting the estimation signal by the second communication device; and estimating, based on the detection of the estimation signal, whether or not a wireless communication channel between the first and second communication devices is adaptable to a second type of wireless communication using a multi-input multi-output (MIMO) system.

Wireless communication method, wireless communication system, and wireless communication device

An adaptive antenna array system includes an antenna array having a plurality of antenna elements, the antenna array synthesizing received signals received by each of the antenna elements by weighting them according to a weighting coefficient and outputting a synthesized signal, a weighting coefficient calculation unit for calculating the weighting coefficient of received signals by adaptive control, an evaluation unit for evaluating the convergence status of adaptive control by the weighting coefficient calculation unit, and a control unit for controlling the operation of adaptive control by the weighting coefficient calculation unit corresponding to the results of evaluation of convergence status by the evaluation unit.

Growing community of inventors

Kawasaki, Japan

Tohru Sunaga