Sharp Kabushiki Kaisha Corporation

National Institute of Information and Communications Technology, Incorporated

Osaka University

Shimpei To

Yasuhiro Hamaguchi

Hideo Namba

Minoru Kubota

Kazunari Yokomakura

Seiichi Sampei

Hiromichi Tomeba

Takashi Onodera

Hiroshi Nakano

Hideo Nanba

Shinichi Miyamoto

Kozue Hirata

Hiroshi Harada

Masafumi Moriyama

Shinsuke Ibi

Osamu Nakamura

Alvaro Ruiz Delgado

Kimihiko Imamura

Shoichi Shitara

Nakano Hiroshi

An apparatus generating a packet of signals, a number of preamble signals of a preamble portion for each of a number of radio transmission units, and a number of data signals of a data portion, wherein a phase rotation in frequency domain is equal to a time shift in time domain is applied to each symbol of the number of preamble signals separately, the same phase rotation is applied to each symbol separately, the amount of the phase rotation is different for each preamble signal and each data signal, the amount of the phase rotation of one of the number of data signals and one of the number of preamble signals is both zero, and the amount of the phase rotation is equal between one of the preamble signals and one of the data signals for the same radio transmission unit.

Communication device

A communication means which allocates a terminal identifier to a destination communication apparatus and carries out communication with the destination communication apparatus by use of a plurality of functions including an identifier generation sectionfor generating different terminal identifiers corresponding to a function used and an identifier allocation sectionhaving an identifier selecting sectionfor allocation to the destination communication apparatus. Using a plurality of different terminal identifiers (terminal function identifiers), a function to be used between the destination can be specified. Moreover, it is possible to optimize the size of a memory for storing information required for adaptive modulation control.

Method and apparatus for allocating terminal identifiers based on communication function

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 communication device receives a reception signal including at least a first reception signal and a second reception signal, where the first reception signal is a signal to be transmitted using a first set of subcarriers and the second reception signal is a signal to be transmitted using a second set of subcarriers which overlaps with at least one end of the first set of subcarriers in a time frame. The communication device also demodulates information indicating data included in the first reception signal after reducing the second reception signal transmitted by using one or more overlapping subcarriers of the second set of subcarriers from the reception signal.

Communication system, communication device and communication method that can improve frequency use efficiency

A wireless communication system includes a first communication device which arranges a frequency signal into which a single carrier signal is converted by time-to-frequency conversion in subcarriers and wirelessly transmits a resultant signal and a second communication device which receives the signal wirelessly transmitted by the first communication device. The wireless communication system includes a selection unit which calculates, for each determined selection candidate as a combination of a predetermined segment size and information indicating predetermined average transmission power, a value indicating reception quality in the second communication device upon transmission by the first communication device by using an arrangement using the predetermined segment size, and the predetermined average transmission power, and which selects a selection candidate to be used upon transmission by the first communication device from among the selection candidates based on the calculated value indicating the reception quality. Therefore, an excellent transmission efficiency is obtained.

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

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 communication terminal performing Fourier transform to convert a first time-domain signal into frequency-domain signals, allocating the frequency-domain signals to one or more first block is composed of two or more contiguous subcarriers as a first allocation unit, performing inverse Fourier transform to convert the allocated frequency-domain signals into a second time-domain signal, and transmitting, to a BS, the second time-domain signal simultaneously with another communication terminal, in case that the other communication apparatus performs communication with the BS using one or more second block composed of two or more contiguous subcarriers as a second allocation unit wherein the second block, wherein the number of subcarriers of the second block is equal to a value of x multiplied by the number of subcarriers of the first block, and x is equal to a value of 2 or a value greater than 2.

Scheduling method and control station apparatus

The present invention switches an interference suppression system between a linear precoding and a nonlinear precoding in accordance with a communication environment. A wireless transmission apparatus is provided with a plurality of transmission antenna units (), and multiplexes spatially and transmits a plurality of series of data with respect to at least one wireless reception apparatus, and includes a selection unit () configured to select any one precoding system from a plurality of types of precoding systems and a precoding unit () configured to carry out precoding with respect to the plurality of series of data using the selected precoding system. In addition, the selection unit selects either of a first precoding system carrying out linear processing with respect to the plurality of series of data or a second precoding system carrying out nonlinear processing with respect to the plurality of series of data.

Wireless transmission apparatus, wireless reception apparatus, wireless communication system, control program and integrated circuit

To realize transmission performances equivalent to those of an MU-MIMO BLAST ZF-THP system without increasing a signal processing amount in a base station apparatus in a downlink MU-MIMO transmission system. A transmission apparatus is provided with a plurality of transmission antennas, generates a transmission signal addressed to each reception apparatus based on information indicating spatial correlation of channels to and from a plurality of reception apparatuses, space-multiplexes the generated each transmission signal in the same wireless resource, and transmits it to each reception apparatus. The transmission apparatus includes: an ordering determination partwhich determines an order in which a transmission signal addressed to each reception apparatus is generated based on information indicating spatial correlation of channels; a linear filter generation partwhich generates a linear filter based on the determined order; a THP partwhich performs a THP process by using the determined order and the linear filter; and a linear filter multiplication partwhich multiplies an output of the THP partby the linear filter.

Transmission apparatus, reception apparatus, wireless communication system, control program and integrated circuit

The disclosed is a transmission device including a plurality of transmission antennas for transmitting signals in the same channel at the same time point to a plurality of reception devices, characterized by including: a dedicated reference signal generator configured to generate dedicated reference signals for the respective reception devices; a data signal generator configured to generate data signals for the respective reception devices; a spatial multiplexer configured to spatially multiplex at least some of the dedicated reference signals and at least some of the data signals; and a transmitter configured to transmit the spatially multiplexed signals.

Communication system, transmitter, receiver and communication method

In a codebook-based closed loop type MIMO, improvement for complexity in a mobile station apparatus, and reduction of amount of overhead needed for notification from the mobile station apparatus should be provided. A wireless transmission apparatus that includes a plurality of transmission antennas, performs precoding on a data signal for each of a plurality of reception apparatuses and spatially multiplexes and transmits the signal after the precoding. The wireless transmission apparatus performs sharing a codebook describing a plurality of linear filters associated with each other is shared with the each reception apparatus, and precoding on the data signal for each reception apparatus, based on a first linear filter that is extracted from the codebook in each reception apparatus based on the association and that is notified from each reception apparatus.

Growing community of inventors

Osaka, Japan

Shimpei To