Nec Corporation

Osaka University

The Doshisha

The University of Electro-communications

Kazushi Muraoka

Hiroaki Aminaka

Masayuki Ariyoshi

Hiroto Sugahara

Taichi Ohtsuji

Kojiro Hamabe

Toshifumi Nakamura

Hisashi Futaki

Yoshikazu Kakura

Naoto Ishii

Norio Yamagaki

Takashi Yoshinaga

Dai Kanetomo

Shinsuke Ibi

Takumi Takahashi

Takeo Fujii

Jun Shikida

Seiichi Sampei

Masaki Inokuchi

Takanobu Doi

Toshiki Takeuchi

Yasuhiko Matsunaga

Masaaki Tanio

Mai Ohta

Dileep Kumar

Daichi Shirase

If interference between a second radio terminal and at least one of one or more first radio terminals is estimated to be a second degree greater than a first degree and less than a third degree, a control apparatus determines that the second radio terminal is required to belong to the same radio terminal subset as the at least one first radio terminal in order to allocate time and frequency resources to the second radio terminal for spatial multiplexing transmission. On the other hand, if interference between the second radio terminal and at least one of the one or more first radio terminals is estimated to be the third degree, the control apparatus determines that the second radio terminal is not allowed to belong to any radio terminal subset and that the second radio terminal is excluded from the spatial multiplexing transmission on the time and frequency resources.

Control apparatus, method performed by control apparatus, and non-transitory computer readable medium

A radio communication apparatus includes a distortion calculation unit and an assignment unit. The distortion calculation unit calculates the degree of distortion of the frequency response of the channel between the radio communication apparatus and the radio terminal. Further, the assignment unit assigns the reference signal to the radio terminal based on the degree of distortion calculated by the distortion calculation unit.

Radio communication apparatus, reference signal assignment method, and non-transitory computer readable medium

A tracking support system includes a position calculating section connected with a plurality of cameras arranged in a predetermined monitoring area to transmit video images imaged by the plurality of cameras and configured to calculate a position of the tracking target based on the video images received from the plurality of cameras; a tracker selecting section configured to select a tracker to be instructed to track the tracking target, based on position information of the terminal received from the terminal and the calculated position of the tracking target; and an information transmitting section configured to transmit information of a distance between the tracking target and the terminal during the tracking of the tracking target to the terminal carried by the selected tracker.

Tracking support apparatus, terminal, tracking support system, tracking support method and program

A control device configured to predict prediction information based on in-operation time-series data with use of a learning device, the learning device being trained, during training, (i) with time-series data, using as training data, in which pieces of radio quality information of respective antennas that are disposed in a distributed manner and that perform wireless communications with a terminal device are arranged in time series, and (ii) with assignment information, using as training data, that includes information about the antenna assigned, from the training data, to the wireless communications after a predetermined length of time, wherein the in-operation time-series data being the time-series data acquired during operation, and the prediction information including information about the antenna to be assigned, from the in-operation time-series data, to the wireless communications after the predetermined length of time.

Control device, wireless communications system, and non-transitory computer-readable medium

A radio terminal () is used in a radio communication system () and communicates with a radio station (). The radio terminal () includes a measurement unit (). The measurement unit () operates to perform, using a terminal measurement procedure for executing a first terminal measurement corresponding to radio access technology applied to the radio communication system (), a second terminal measurement of a shared frequency shared by a plurality of radio systems including the radio communication system ().

Radio terminal, radio station, radio communication system, and methods implemented therein

A transmitting terminal (A) transmits first D2D control information () in one or more subframes within a first subframe pool () within a first D2D control period () and performs data transmission (-) in accordance with the first D2D control information () in one or more subframes within a second subframe pool () within the first D2D control period (). The first D2D control information () contains a second information element indicating whether the first D2D control information () is valid in at least one D2D control period () occurring after the first D2D control period (). This makes it possible to contribute, for example, to reducing failure in reception of scheduling assignment information that is transmitted in a radio resource region for control in a periodic D2D control period and that specifies D2D transmission resources.

Terminal, base station, and method for the same

A delta-sigma modulation apparatus performs delta-sigma modulation on a first signal as an input signal and outputs a second signal, outputs, using the second signal and a third signal generated through a transmission process of the second signal, a fourth signal that is an approximated value of a signal which is generated through at least part of the transmission process, and performs the delta-sigma modulation on the first signal using the fourth signal and outputs the second signal.

Delta-sigma modulation apparatus, delta-sigma modulation method, and recording medium

A wireless receiving apparatus generates an N'&#xd7;B&#x2032; weight matrix W whose columns are orthogonal to each other by decomposing an estimated N&#x2032;&#xd7;M&#x2032; channel matrix into the N&#x2032;&#xd7;B&#x2032; weight matrix W and a B&#x2032;&#xd7;M&#x2032; matrix containing two or more non-zero matrix elements in each column, where B&#x2032; is an integer less than or equal to N&#x2032;-1 and greater than or equal to M&#x2032;. Alternatively, the wireless receiving apparatus generates a combination of an N&#x2032;&#xd7;B&#x2032; sub-weight matrix Wand at least one second sub-weight matrix, where the product of the sub-weight matrix Wwith the at least one second sub-weight matrix is equal to the weight matrix W. The wireless receiving apparatus performs receive beamforming on received signals of N&#x2032; receiving antennas using the weight matrix W or the sub-weight matrix W. The wireless receiving apparatus then performs a BP algorithm using receive-beamformed signals.

Wireless receiving apparatus and method thereof

A computer system includes at least one memory and at least one processor coupled to the at least one memory and configured to execute one or more sets of instructions. The one or more sets of instructions, when executed by the at least one processor, cause the computer system to provide virtualized radio access network functions including executing a BP algorithm and provide controller functions including adjusting the total number of iterations of the BP algorithm depending on available computing resources of the computer system.

Computer system and method therefor

A method implemented in a computer system includes training a network, which is obtained by unfolding an iterative algorithm for demodulation or demodulation and decoding, using a machine learning technique with a loss function that takes into account non-Gaussianity of a log-likelihood ratio (LLR) distribution calculated from an output of the network. The method further includes producing a first set of learned parameters of that iterative algorithm.

Receiver apparatus, and method for producing parameters for demodulation

Growing community of inventors

Tokyo, Japan

Kazushi Muraoka