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 |
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 |
20150124723 | WIRELESS COMMUNICATION APPARATUS, WIRELESS COMMUNICATION METHOD, PROCESSING APPARATUS, AND PROGRAM - A wireless communication apparatus is used in a wireless communication system in which carrier sensing, and an exchange of a transmission request signal and a transmission permission signal are performed in order to perform wireless communication. The wireless communication apparatus includes: a reception unit that is capable of receiving multiple signals simultaneously; and a control unit that generates an acknowledgement response to a data signal on a priority basis in a case where the data signal and a transmission request signal are included in signals received by the reception unit. | 05-07-2015 |
20150139106 | WIRELESS COMMUNICATION APPARATUS, WIRELESS COMMUNICATION METHOD, WIRELESS COMMUNICATION SYSTEM, AND PROCESSOR - MU-MIMO is implemented with little changes in the mechanism of the DCF. There is provided a wireless terminal station apparatus that is used in a wireless communication system formed of one wireless base station apparatus and a plurality of wireless terminal station apparatus, in which grouping is performed on the wireless terminal station apparatus in such a way that the wireless terminal station apparatus belongs to any one of a plurality of groups, and the wireless terminal station apparatus includes a backoff controlling portion that performs control such that a backoff value at the time of random backoff, the backoff value of the wireless terminal station apparatus belonging to at least one group, is selected from a set of candidates for a backoff value which is a set of values formed of predetermined limited numbers. | 05-21-2015 |