Kyoto University

Sony Group Corporation

Sony Corporation

National Institute of Information and Communications Technology, Incorporated

Keiichi Mizutani

Hiroshi Harada

Naoki Kusashima

Takeshi Matsumura

Ryo Sawai

Ryota Kimura

Kyoya Teramae

Kazuyuki Shimezawa

Hiroto Kuriki

Ren Sugai

Ryuhei Funada

Takuya Habara

Kiminobu Makino

Yosuke Kodama

Yuji Mizutani

A communication device (A) includes a communication unit () and a control unit (). The communication unit () performs wireless communication with a first communication device () that supports in-band full-duplex (IBFD) communication that transmits and receives wireless signals using at least a part of resources of the same frequency and the same time. The control unit () measures channel quality with a first communication device () at each level of quality of service requested for the wireless communication with the first communication device () on the basis of interference from a second communication device (B) that performs wireless communication with the first communication device ().

Communication device and communication method

Disclosed is a communication device that includes a communication unit and a notification unit. The communication unit, while wirelessly communicating in a first communication mode using a first resource of a predetermined frequency channel, wirelessly communicates in a second communication mode in which a lower delay is required than in the first communication mode using a second resource at least partially overlapping the first resource on a frequency axis and a time axis. The notification unit notifies a reception destination in the first communication mode, of the second resource.

A communication device includes: a communication unit that is allowed to simultaneously perform data transmission and data reception by using a same band; an acquisition unit that acquires information regarding self-interference generated at a time when the data transmission and the data reception are simultaneously performed by using the same band; and a communication control unit that performs control regarding the data transmission based on information regarding the self-interference or information from another device generated based on the information regarding the self-interference.

Communication device, information processing device, communication method, and information processing method

A transmission device including a time-domain windowing processing circuit to which a transmission symbol is input and in which the transmission symbol is multiplied by a time window. As the time window, a result of pre-convolving an arbitrary filter into an arbitrary time window is used.

Transmission device and transmission method

Provided is a communication apparatus that flexibly switches execution/non-execution of FD. The communication apparatus includes the followings: a resource allocation unit that allocates, to another communication apparatus, reception radio resources in a predetermined frequency channel and allocates transmission radio resources at least partially overlapping the reception radio resources on a time axis; and a notification unit that notifies the other communication apparatus of information regarding the reception radio resources and the transmission radio resources. The resource allocation unit further allocates transmission radio resources at least partially overlapping the reception radio resources on a frequency axis.

Communication apparatus and communication method

Provided are a communication apparatus that is operated under a wireless communication environment to which a full duplex communication scheme is applied and a communication method. The communication apparatus includes a communication section that performs wireless communication and a control section that controls operation of the communication section and processing of a signal transmitted and received by the communication section. Upon receiving, through a downlink control channel from a base station, designation regarding a resource in which interference is to be measured, the control section conducts, in the designated resource, measurement of interference from another terminal. In addition, the control section further controls transmission of interference information obtained by the measurement to the base station.

Provided is a communication device in which: a wireless network is formed of at least one sub-tree including a sub-root station; the sub-root station collects request wireless resource allocation information which a child station included in the sub-tree has; request wireless resource allocation information of the sub-root station itself is added to the collected request wireless resource allocation information, and the resultant information is reported to a parent station, the parent station notifies the sub-root station of wireless resource information available in the entire sub-tree; and the sub-root station allocates wireless resources to the sub-root station itself and the child station based on the wireless resource information notification.

Communication device and communication system

A propagation channel estimation method is provided. In-phase and quadrature components of a propagation channel estimation value in each pilot subcarrier are separated into amplitude and phase components. A propagation channel of a data subcarrier portion existing between pilot subcarriers is estimated by phase/amplitude separation linear interpolating in each separated amplitude and phase component. A reference parameter is produced by linear interpolating a portion between pilot subcarriers on a complex plane. When quadrants on the complex plane of the interpolated phase component estimation value and the reference parameter are different, a phase connecting process to cancel a discontinuity of the phases is executed to the phase component estimation value interpolated by the phase/amplitude separation linear interpolation. When the quadrants are not different or after the phase connecting process, a complex propagation channel estimation value of the data subcarrier portion is calculated from the phase and amplitude components of the propagation channel estimation value.

Propagation channel estimation method

Provided is a transmission device of a single carrier frequency-domain equalization scheme having a circuit in which a cyclic prefix (CP) and an overlap margin (OM) are inserted, and a time-domain windowing processing circuit to which is input a transmission symbol into which the CP and the OM have been inserted. The time-domain windowing processing circuit multiplies an arbitrary time-domain window function and suppresses out-of-band emission. In the time-domain windowing processing circuit, a window transition length of the time-domain window function is equal to or larger than a length of the CP.

Transmission device, transmission method, reception device, and reception method

A transmitter using a channel aggregation in which available channels existing in various frequency bands are bound and transmitted and using an Orthogonal Frequency Division Multiplexing (OFDM), an Orthogonal Frequency Division Multiple Access (OFDMA), or a system similar to them as a modulation system. One or a plurality of transmission units are provided in parallel, and one or a plurality of transmission processing units are provided in parallel. The transmission processing unit has an inverse fast Fourier transforming circuit or a discrete inverse Fourier transforming circuit, a GI and overlap margin (OM) insertion circuit, and a time-domain windowing processing unit. The time-domain windowing processing unit multiplies a universal time-domain window function in accordance with a spectrum mask and transport electric power which are required in each channel, thereby suppressing out-of-band radiation electric power every channel. A kind and a window transition duration of the time-domain window function can be arbitrarily set every channel.

Transmitter, transmission method, and receiver based on time-domain windows

In order to suppress out-of-band radiation within a range of a spectrum mask regulation without reducing transmission signal power or the like even when a wireless communication is performed in a white space by using OFDM or the like, the present invention is characterized by including an RF circuit characteristic analysis unit, a multipath delay detection unit, a digital filter setting unit, and a transmission power setting unit and further including: a windowing function/windowing duration selection unit configured to select a windowing function and a windowing duration based on the analysis result by the RF circuit characteristic analysis unit, the detection result by the multipath delay detection unit, and the setting by the digital filter setting unit and the transmission power setting unit; a guard interval duration selection unit configured to select a guard interval duration; and a transmission power selection unit configured to select transmission power.

Growing community of inventors

Kyoto, Japan

Keiichi Mizutani