Sharp Kabushiki Kaisha Corporation

Osaka University

Nec Corporation

The Doshisha

Shinsuke Ibi

Seiichi Sampei

Yasuhiro Hamaguchi

Kazunari Yokomakura

Shinichi Miyamoto

Osamu Nakamura

Jungo Goto

Minoru Kubota

Shimpei To

Hiroki Takahashi

Kazushi Muraoka

Naoto Ishii

Hideo Namba

Takumi Takahashi

Takanobu Doi

Takashi Yoshimoto

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

A BP detector of a wireless receiver apparatus reads a first parameter set or a second parameter set. The first parameter set includes a plurality of scaling factors and a plurality of damping factors learned together using a deep learning technique. The second parameter set includes a plurality of scaling factors and a plurality of node selection factors learned together using a deep learning technique from a memory. The BP detector executes an iterative BP algorithm that uses the first parameter set or the second parameter set in order to perform multi-user detection.

Wireless receiver apparatus

Provided is a communication device, even in a case that many communication devices are connected in a radio communication network constituted of a plurality of different radio communication technologies, that suppresses data transmission of one communication technology from delaying due to data transmission situation of another communication device and enables coexistence of different radio communication technologies. A communication device for transmitting and/or receiving a signal using a plurality of radio communication systems, the communication device includes transmitting a signal configured to reserve a first frequency indicating that a radio wave of a prescribed frequency band is used using a first radio communication system among the plurality of radio communication systems; and transmitting, after transmitting the signal indicating that the radio wave is used, a signal configured to request transmission of data to another communication device using a second radio communication system that is different from the first radio communication system.

Communication device and communication method

A communication device comprising at least a receiver and a demodulator. The receiver receives first receiving signals and second receiving signals, wherein the first receiving signals are allocated to a first set of subcarriers composed of two or more continuous subcarriers, the second receiving signals are allocated to a second set of subcarriers composed of two or more continuous subcarriers, and at least a portion of the second set of subcarriers overlaps a portion of the first set of subcarriers in a time frame. The demodulator configured to detect the second receiving signals transmitted using one or more subcarriers from receiving signals including the first receiving signals and the second receiving signals, wherein the one or more subcarriers are subcarriers such that the first set of subcarriers overlap the second set of subcarriers, and the demodulator being demodulates the first receiving signals.

Radio communication system, method, device and computer  readable medium including first and second receiving signals respectively allocated to first and second overlapping subcarriers

A bit coding device that creates a coded bit sequence by performing error correction coding on an input bit sequence that is input, includes a coding unit that creates a first bit sequence by performing the error correction coding on the input bit sequence, an extraction unit that extracts a second bit sequence from the first bit sequence, and an information compression unit that creates a third bit sequence by performing lossy compression on the second bit sequence, in which coded bits include at least a portion of the third bit sequence.

Bit coding device, bit decoding device, transmission device, reception device, bit coding method, bit decoding method, transmission method, reception method, and program

Radio communication system, method, device and computer readable medium including first and second receiving signals respectively allocated to first and second overlapping subcarriers

A communication device comprising a transmission unit and a reception unit. The transmission unit is configured to transmit, to a first communication device, first information indicating a first set of subcarriers comprising of a plurality of subcarriers, and to a second communication device, second information indicating a second set of subcarriers comprising of a plurality of subcarriers. The reception unit is configured to receive a first Discrete Fourier Transform-spread-OFDM (DFT-S-OFDM) signal from the first communication device using the first information and a second Discrete Fourier Transform-spread-OFDM (DFT-S-OFDM) signal from the second communication device using the second information. Also, in the communication device, a portion of the second set of subcarriers can overlap with at least a portion of the first set of subcarriers in a time frame of a plurality of time frames.

Radio communication system, radio communication method, radio communication device, reception device, and program

A reception device comprises a reception unit for receiving signals transmitted by assigning respectively a plurality of different frequency signal groups, which are generated based on a same bit sequence, to a plurality of layers, an MIMO separation unit for executing MIMO separation of the signals, received by the reception unit, into the frequency signal groups corresponding respectively to the plural layers, and a merging unit for merging individual items of information based on the frequency signal groups obtained by the MIMO separation, the items of information corresponding respectively to the plural layers.

Reception device, transmission device, reception method, transmission method, program, and radio communication system

To provide a system that can accommodate a greater number of terminals within a limited band and can obtain a higher transmission rate. While the number of frequency signals (spectrums) output in parallel by performing a spread spectrum from the DFT unit of each terminal is 12, the number of sub-carriers constituting one sub-channel is set at 10 or 11. In this case, the users (users A and G) allocated to the sub-channels at both ends of the band will not perform transmission of one frequency signal at the end (one sub-carrier) of all the frequency signals output from the DFT unit, whereas the users (users B to F) allocated to the other sub-channels will not perform transmission of the frequency signals at the ends (two sub-carriers). This transmission can be realized by deleting (clipping) the associated number of signals from both ends or from one end of the frequency signals output from the DFT unit of each terminal and allocating the frequency signals after clipping, to individual sub-channels.

Radio communication system and transmitting apparatus used for the same

A communication device includes a turbo encoding section including a plurality of component encoders, wherein the plurality of component encoders within the turbo encoding section use different constraint lengths.

Wireless communication system, communication device, program, and integrated circuit

A wireless communication system includes: a multiple number of mobile station apparatuses that transmit code bits obtained by applying error-correction coding to information bits; a relay station apparatus that receives code bits from the multiple mobile station apparatuses, applies network coding on the code bits and transmits the network-code bits; and a base station apparatus that receives and decodes the code bits and the network-code bits, wherein the base station apparatus, when decoding the received code bits, performs iteration decoding by regarding the received code bits as a serially concatenated code of network coding and error correction coding. Accordingly, decoding is performed by regarding the network code and the error correction code as a serial concatenated code, it is possible to obtain diversity with a simple configuration.

Wireless communication system, base station apparatus and communication method

To improve performance of a decoder even in a system with the coder configuration determined by inserting a doping bit sequence known between a transmission apparatus and a reception apparatus in an information bit sequence to transmit, the transmission apparatus is a transmission apparatus that transmits radio signals to the reception apparatus, and is provided with a doping sectionthat inserts a doping bit sequence which is known between the transmission apparatus and the reception apparatus in an information bit sequence to transmit to the reception apparatus, coding sectionsthat perform error-correcting coding on a bit sequence with the doping bit sequence inserted therein, a puncturing section that performs puncturing on a bit sequence subjected to the error-correcting coding, and a wireless transmission sectionthat transmits a bit sequence subjected to the puncturing.

Transmission apparatus reception apparatus and communication system

A transmission method according to the present invention has been conceived assuming an environment where two information source nodes independently communicate with one destination node, and thus is applicable to such a simple topology. The transmission method provides an inter-node cooperation relationship which provides a sufficient advantageous effect even in an environment in which there is a difference in the power levels of the received signals that reach the address node via two routes. The transmission method is performed by a node U() and a node Uthat is located closer to the node D () than the node U() to transmit signals to a node D () which iteratively detects a log likelihood ratio between mutually corresponding pairs of bits included in the signals at constellation points. According to the transmission method, the node U() modulates the first bit sequence to generate a first signal and transmits the generated first signal, and the node U() receives the first signal, performing logical operation on the second bit sequence and the first bit sequence included in the received first signal to generate a third bit sequence, modulates the generated third bit sequence to generate a second signal, and transmits the generated second signal.

Growing community of inventors

Suita, Japan

Shinsuke Ibi