Patent application number | Description | Published |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |