Patent application number | Description | Published |
20090279419 | COMMUNICATION APPARATUS AND COMMUNICATION METHOD - To efficiently compress the information amount for feedback when a communication apparatus sends back a result of performing discrete cosine transform on the reception quality information to a communication apparatus of a communicating destination. In a communication apparatus for transmitting feedback information generated based on a plurality of reception quality information to a communicating destination apparatus, the feedback information is a result of performing discrete cosine transform on the plurality of reception quality information, and performing respective different quantization on signal components of at least a group of samples among signal components of a plurality of samples obtained by the discrete cosine transform. | 11-12-2009 |
20100098177 | RADIO TRANSMISSION DEVICE, CONTROL DEVICE, RADIO COMMUNICATION SYSTEM, AND COMMUNICATION METHOD - A radio communication system converts a time domain signal into a plurality of frequency signals to be allocated onto a plurality of subcarriers to be transmitted. The radio communication system changes a method of allocating the plurality of frequency signals onto the plurality of subcarriers based on transmission power information. | 04-22-2010 |
20100158146 | COMMUNICATION SCHEME DETERMINING APPARATUS, TRANSMISSION APPARATUS, RECEPTION APPARATUS, OFDM ADAPTIVE MODULATION SYSTEM AND COMMUNICATION SCHEME DETERMINING METHOD - Modulation information is efficiently notified to a communicating destination. Provided are a first modulation information determining section | 06-24-2010 |
20100190506 | SCHEDULING METHOD AND CONTROL STATION APPARATUS - Consecutive subcarriers are reserved, and the reserved consecutive subcarriers are properly allocated to a terminal. The invention is a scheduling method that allocates, within an available band, a block composed of one or more subcarriers and used for signal transmission by a communication terminal being a destination of communication, and the method includes the steps of selecting (S | 07-29-2010 |
20100254484 | WIRELESS COMMUNICATION SYSTEM, WIRELESS TRANSMISSION DEVICE, WIRELESS COMMUNICATION METHOD, AND PROGRAM - A wireless transmission device converts signals having been subjected to a first modulation into frequency domain signals, and allocates the frequency domain signals converted to subcarriers for transmission. The wireless transmission device includes: a controller that selects, based on channel qualities of the subcarriers to which the frequency domain signals are allocated, a value satisfying a predetermined communication quality as control information indicative of the number of frequency domain signals included in each of segments into which the frequency domain signals are segmentalized; and an allocating unit that segmentalizes the frequency domain signals into segments, each of the segments including the same number of frequency domain signals as the value selected as the control information by the controller, and allocates the frequency domain signals included in each of the segments to sequential subcarriers. | 10-07-2010 |
20110045765 | RADIO COMMUNICATION SYSTEM, BASE STATION APPARATUS AND RELAY STATION APPARATUS - In a radio communication system including a base station apparatus | 02-24-2011 |
20110097993 | RELAY APPARATUS, COMMUNICATION SYSTEM AND RELAY METHOD - It is aimed to expand a coverage area of a transmission apparatus by relay, while improving spectral efficiency (cell throughput). A relay apparatus for transmitting a signal received from a transmission apparatus to a reception apparatus has a received signal processing section | 04-28-2011 |
20120294240 | COMMUNICATION SYSTEM, COMMUNICATION DEVICE, COMMUNICATION METHOD, AND PROCESSOR - A communication device on the transmission side includes: a converting device configured to perform equivalent conversion on a part of the plurality of data signals; and a weighting device configured to previously cancel at least a part of interferences among the plurality of streams spatially multiplexed, with respect to at least a part of the plurality of data signals. | 11-22-2012 |
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 |
20120327830 | WIRELESS COMMUNICATION SYSTEM, WIRELESS TRANSMISSION DEVICE AND WIRELESS TRANSMISSION METHOD - A wireless communication system includes: wireless transmission devices; and a wireless reception device. Each of the wireless transmission devices is configured to transmit data by transforming a time domain signal into frequency domain signals to obtain first frequency signals, clipping a part of the first frequency signals to generate second frequency signals, and allocating the second frequency signals onto subcarriers. The wireless reception device is configured to demodulate, from signals received, time domain data transmitted. Communication is performed using a clipping rate set for each of the wireless transmission devices, the clipping rate being the number of the second frequency signals divided by the number of the first frequency signals. | 12-27-2012 |
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 |
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 |
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 |
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 |
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 |