Patent application number | Description | Published |
20120307706 | TRANSMISSION DEVICE, RECEPTION DEVICE, WIRELESS COMMUNICATION SYSTEM, TRANSMISSION CONTROL METHOD, RECEPTION CONTROL METHOD, AND PROCESSOR - A multiplexed signal generator is configured to multiplex a signal addressed to a first reception device which has been subjected to a power suppression process of suppressing the power of the signal, and a signal addressed to a second reception device which is not subjected to the power suppression process. | 12-06-2012 |
20120327881 | COMMUNICATION SYSTEM, TRANSMITTER, RECEIVER AND COMMUNICATION METHOD - 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. | 12-27-2012 |
20130003641 | COMMUNICATION SYSTEM, TRANSMITTER AND RECEIVER - Disclosed is a transmission device including a plurality of antennas for transmitting signals in the same channel at the same time point to a plurality of reception devices, characterized by including: a DRS generator configured to generate DRSs (dedicated reference signals) for the respective reception devices; a nonlinear spatial multiplexer configured to generate a nonorthogonal DRS by use of a first group of DRSs including at least one of the DRSs; and a transmitter configured to transmit a signal containing at least the nonorthogonal DRS. | 01-03-2013 |
20130016712 | RADIO COMMUNICATION SYSTEM AND RECEIVING APPARATUSAANM Tomeba; HiromichiAACI Osaka-shiAACO JPAAGP Tomeba; Hiromichi Osaka-shi JPAANM Nakamura; OsamuAACI Osaka-shiAACO JPAAGP Nakamura; Osamu Osaka-shi JPAANM Toh; ShinpeiAACI Osaka-shiAACO JPAAGP Toh; Shinpei Osaka-shi JP - A radio communication system includes a multiple number of transmitting apparatus and a receiving apparatus including a multiple number of receive antennas, in which the transmitting apparatus generates a reference signal that is obtained by adding a different time shift to a known signal between the transmitting apparatus and the receiving apparatus, multiplexes a data signal with the reference signal and transmits the resultant signal. The receiving apparatus separates reference signals multiplexed on the signals received from the multiple transmitting apparatus, and estimates channel information from the reference signals, which have been transmitted through common frequencies in part or whole of the signal spectra. Then, the data signal is decoded based on the estimated channel information. | 01-17-2013 |
20130064150 | COMMUNICATION SYSTEM, TRANSMITTER, TRANSMISSION CONTROL METHOD, TRANSMISSION CONTROL PROGRAM, AND PROCESSOR - A precoding deciding unit selects precoding for the spatial multiplexing of signals addressed to a plurality of receivers form a plurality of precodings. A filter multiplication unit multiplies the signals by filter coefficients to be used in the precoding selected by the precoding deciding unit. | 03-14-2013 |
20130070871 | RECEIVING APPARATUS, TRANSMITTING APPARATUS AND WIRELESS COMMUNICATION SYSTEM USING THEM - When spatial multiplexing is performed to any of a plurality of receiving antennas included in each terminal, it becomes possible to obtain excellent receiving characteristics by combining signals received by all antennas appropriately. A receiving antenna unit | 03-21-2013 |
20130100920 | WIRELESS COMMUNICATION SYSTEM, RECEPTION APPARATUS, RECEPTION CONTROL METHOD, RECEPTION CONTROL PROGRAM, AND PROCESSOR - A mobile station apparatus receives the same spectra that have been transmitted from at least one first transmit antenna and a second transmit antenna. An equalization unit performs, for each of the same spectra, using spectra of subcarriers having the same spectrum placed therein, equalization of the spectrum. | 04-25-2013 |
20130121277 | BASE STATION APPARATUS, TERMINAL APPARATUS AND WIRELESS COMMUNICATION SYSTEM USING THEM - When signals received by receiving antennas included in each terminal are subjected to MMSE combining, it is configured that each terminal is able to grasp position of desired signal in signal vector obtained after combining. A base station | 05-16-2013 |
20130136050 | TRANSMISSION APPARATUS, 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 part | 05-30-2013 |
20130223269 | BASE STATION DEVICE, MOBILE STATION DEVICE, AND RADIO COMMUNICATION SYSTEM USING SAME - Provided is a radio communication system in which a base station apparatus with a plurality of transmission antennas spatially multiplexes and transmits a transmission signal addressed to a plurality of mobile station apparatuses, and in which the mobile station apparatuses receive the signal transmitted from the base station apparatus. The mobile station apparatuses select a desired precoding vector from predetermined candidates, and give the base station apparatus information identifying the selected precoding vector. The base station apparatus generates a linear filter on the basis of the information from the mobile station apparatuses, grasps multi-user interference that at least one of the mobile station apparatuses is subjected to when the generated linear filter is used, generates a new transmission signal by subtracting the multi-user interference from the transmission signal, and spatially multiplexes the transmission signal addressed to the plurality of mobile station apparatuses by multiplying the new transmission signal by the linear filter. Thus, favorable reception characteristics can be obtained while CSI feedback is performed efficiently. | 08-29-2013 |
20130242849 | WIRELESS TRANSMISSION APPARATUS, WIRELESS RECEPTION APPARATUS, WIRELESS COMMUNICATION SYSTEM AND INTEGRATED CIRCUIT - 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. | 09-19-2013 |
20130286940 | BASE STATION DEVICE, TERMINAL DEVICE, AND WIRELESS COMMUNICATION SYSTEM USING THE BASE STATION DEVICE AND THE TERMINAL DEVICE - A wireless communication system in which a base station apparatus having a plurality of transmission antennas and one or more terminal apparatuses communicate with each other is provided with at least two methods of a first feedback method and a second feedback method regarding propagation path information at the time of reception. In accordance with a communication condition between the base station apparatus and the terminal apparatus, or the function of the terminal apparatus, the terminal apparatus performs feedback by one of the two methods of the first feedback method and the second feedback method. The base station apparatus performs spatial multiplexing transmission on the basis of the propagation path information that has been fed back. Thus, in a system in which CSI is fed back for MIMO transmission, desired transmission characteristics can be efficiently obtained. | 10-31-2013 |
20130286949 | WIRELESS COMMUNICATION SYSTEM, BASE STATION APPARATUS, MOBILE STATION APPARATUS AND COMMUNICATION METHOD IN WIRELESS COMMUNICATION SYSTEM - A wireless communication system includes a base station apparatus having a plurality of antennas and a plurality of mobile station apparatuses each having, at least, one antenna. The base station apparatus acquires channel state information of the plurality of mobile station apparatuses, based on any one of a plurality of different channel state information formats, and, separately precodes data signals addressed to the plurality of mobile station apparatuses based on the channel state information, and spatially multiplexes and transmits the precoded signals. The mobile station apparatus receives the precoded signals and detects a desired data signal from the multiplexed signals addressed to mobile station apparatuses, based on the channel state information. With this scheme, it is possible to realize a new spatial multiplexing technology that enables a plurality of mobile station apparatuses using different CSI feedback schemes to be spatially multiplexed on the same wireless resource in the downlink MU-MIMO transmission. | 10-31-2013 |
20130336282 | TRANSMITTER APPARATUS, RECEIVER APPARATUS, COMMUNICATION SYSTEM, COMMUNICATION METHOD, AND INTEGRATED CIRCUIT - A transmitter apparatus to transmit to a plurality of receiver apparatuses a data signal at the same timing and on the same frequency, includes a transmitter unit that transmits a demodulation reference signal addressed to a first receiver apparatus and a demodulation reference signal addressed to a second receiver apparatus different from the first receiver apparatus at the same timing and on the same frequency. | 12-19-2013 |
20130336418 | WIRELESS COMMUNICATION SYSTEM, BASE STATION DEVICE, AND TERMINAL DEVICE - A terminal device notifies a base station device about control information associated with a receive quality of the terminal device. The base station device performs data modulation on a plurality of pieces of transmit data for the terminal device, by using a plurality of different data modulation schemes one by one, based on the control information, and spatially multiplexes the plurality of pieces of transmit data after the data modulation over a single wireless resource and transmits a spatially multiplexed signal. The terminal device receives the signal with the plurality of pieces of transmit data spatially multiplexed, and detects desirable transmit data from the receive signal, based on a first channel matrix which represents channel state information between the base station device and the terminal device and a second channel matrix in which the first channel matrix is multiplied by a transform matrix. Accordingly, an adaptive modulation technology is applied even to MIMO spatial multiplexing transmission using a LR technology, and hence a wireless communication system and so forth that can contribute to improvement in frequency utilization efficiency can be provided. | 12-19-2013 |
20140064354 | FILTER CALCULATING DEVICE, TRANSMITTING DEVICE, RECEIVING DEVICE, PROCESSOR, AND FILTER CALCULATING METHOD - A filter calculating device includes a first equalization filter calculating section that generates at least a first conversion matrix and a first triangular matrix based on a channel state of a first channel; a first quasi-orthogonalization section that calculates a first unimodular matrix based on the first triangular matrix; and a second equalization filter calculating section that generates at least a second conversion matrix and a second triangular matrix based on a channel state of a second channel and the first unimodular matrix. | 03-06-2014 |
20140146904 | WIRELESS TRANSMISSION APPARATUS, WIRELESS RECEPTION APPARATUS, WIRELESS COMMUNICATION SYSTEM, CONTROL PROGRAM AND INTEGRATED CIRCUIT - 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 ( | 05-29-2014 |
20140177747 | MIMO COMMUNICATION METHOD, MIMO TRANSMITTING DEVICE AND MIMO RECEVING DEVICE - The current feedback mechanisms in the 802.11 standard are not appropriate for MU-MIMO, in which many STAs transmit their feedback to an AP, which then proceeds to select the most appropriate STAs for transmission and discards the feedback of the rest of the STAs. This operation leads to large overhead, effectively limiting the effectivity of the MU-MIMO operation. The techniques described in this document allow for a more efficient transmission of feedback related to a MIMO communication. | 06-26-2014 |
20140177751 | PRECODING APPARATUS, PROGRAM FOR PRECODING, AND INTEGRATED CIRCUIT - More reduction of the amount of operation than in QRM-VP is realized while maintaining transmission performance that can be achieved by VP. A precoding apparatus | 06-26-2014 |
20140177763 | WIRELESS RECEIVING APPARATUS AND PROGRAM - A data signal component output from a reference signal demultiplexer and channel state information obtained by using DM-RS output from a channel estimating unit are input into a modulo estimating unit. In a channel compensator, a first provisional decision value sequence is calculated on the basis of the channel state information. The first provisional decision value sequence is input into a modulo calculator, and modulo calculations are performed on the first provisional decision value sequence to obtain a second provisional decision value sequence. A decision-feedback channel estimating section finds a first channel estimation value based on the first provisional decision value sequence and a second channel estimation value based on the second provisional decision value sequence. A modulo decision section decides whether or not a perturbation term has been added to a code, and uses a decision result for the selection of a demodulation method. | 06-26-2014 |
20140204841 | WIRELESS TRANSMISSION DEVICE AND WIRELESS RECEPTION DEVICE - A wireless reception device is notified of whether a multi-user MIMO signal transmitted from a wireless transmission device has undergone linear precoding or non-linear precoding without increasing the amount of control information. A wireless transmission device having a plurality of transmit antennas | 07-24-2014 |
20150023279 | PRE-CODING DEVICE, WIRELESS TRANSMISSION DEVICE, WIRELESS RECEIVING DEVICE, WIRELESS COMMUNICATION SYSTEM, AND INTEGRATED CIRCUIT - A terminal device knows which kind of pre-coding has been applied without increasing overhead in a wireless communication system in which plural kinds of pre-coding are selectively or simultaneously used. | 01-22-2015 |
20150029979 | RADIO TRANSMITTING APPARATUS, RADIO RECEIVING APPARATUS, RADIO COMMUNICATION SYSTEM, AND INTEGRATED CIRCUIT - A radio receiving apparatus is notified of whether a multi-user multiplexing transmission signal that is transmitted from a radio transmitting apparatus is the multi-user MIMO or the OFDMA without increasing a control information amount. The radio transmitting apparatus includes a scheduling section | 01-29-2015 |