Patent application number | Description | Published |
20100215080 | RADIO COMMUNICATION METHOD, RADIO COMMUNICATION SYSTEM, AND RADIO TRANSMISSION APPARATUS - A transmission apparatus according to the present invention includes: an encoding section; a modulation section; a variable-SF spreading section that performs spreading with variable SF according to control information A from a control section; an IDFT section that performs IDFT on output from the spreading section; a GI inserting section; a parallel/serial conversion section that converts output from the GI inserting section into a serial data sequence; a digital/analog conversion section; and an RF section that transmits a signal from an antenna after converting the signal to a frequency band for analog signal transmission and controlling it to an appropriate transmission power. The control section is configured to generate control information A for determining the variable SF and input the information A to the variable-SF spreading section and the RF section. In control information A, SF is varied depending on transmission power required. | 08-26-2010 |
20100220797 | COMMUNICATION APPARATUS - When in-phase data with an amplitude of 1 is located in each subcarrier, the envelope waveform of a time domain signal contains guard band | 09-02-2010 |
20100260251 | RADIO COMMUNICATION SYSTEM, RECEPTION DEVICE, AND RECEPTION METHOD - A reception device which receives a signal transmitted by a transmission device that changes at least one of a modulation scheme and a coding rate based on information reported from the reception device, the reception device includes an equalization unit which equalizes a received signal in a frequency domain, a signal-noise ratio measuring unit which measures a signal-noise ratio from the received signal after equalization, and a notification signal generation unit which sets at least one of a modulation scheme and a coding rate from the quality of reception and generates a signal to be reported to the transmission device. | 10-14-2010 |
20100266065 | RADIO COMMUNICATION SYSTEM, RECEPTION DEVICE, AND RECEPTION METHOD - A reception device which receives a signal transmitted by a transmission device which changes at least one of a modulation scheme and a coding rate. The reception device includes an equalization unit which equalizes a received signal in frequency domain, a reliability calculation unit which calculates the reliability of a transmitted bit from the received signal after equalization, a mutual information amount calculation unit which calculates a mutual information amount based on the reliability of the transmitted bit calculated by the reliability calculation unit, and a notification signal generation unit which sets at least one of a modulation scheme and a coding rate based on the mutual information amount calculated by the mutual information amount calculation unit to generate a signal to be reported to the transmission device. | 10-21-2010 |
20100318876 | DECODING DEVICE, DECODING METHOD, DECODING PROGRAM, RECEPTION DEVICE, AND COMMUNICATION SYSTEM - A decoding device which decodes error correction coded information by iterating a decoding process. The decoding device includes an iteration quantity determination unit which calculates a mutual information indicating a relationship with transmission information of the coded information and determines the number of iterations of the decoding process based on the calculated mutual information. | 12-16-2010 |
20110004803 | EXECUTION DECISION APPARATUS, RECEIVING APPARATUS, RADIO COMMUNICATION SYSTEM, AND EXECUTION DECISION METHOD - An execution decision apparatus decides whether to execute a detection process for a turbo equalization apparatus which detects data before coding, by repeating processes performed on transmission data coded by error correction coding, by an equalization unit for compensating distortion by a propagation path and a decoding unit for performing an error correction process, and includes an equalization unit I/O characteristic acquisition unit which acquires an I/O characteristic of the equalization unit; a decoding unit I/O characteristic acquisition unit which acquires an I/O characteristic of the decoding unit; and a decision unit which decides whether to execute the detection process in the turbo equalization apparatus based on the I/O characteristic acquired for each of the equalization unit and the decoding unit. | 01-06-2011 |
20110007701 | COMMUNICATION SYSTEM, COMMUNICATION DEVICE AND COMMUNICATION METHOD - A communication system that transmits a signal from a first communication device to a second communication device using a plurality of frequency channels, wherein at least one of the plurality of frequency channels uses part of subcarriers in an overlapping manner with one or more adjacent frequency channels, the first communication device includes a transmission unit which transmits a signal to the second communication device using one or more of the plurality of frequency channels, and the second communication device includes a reception unit which receives the signal transmitted by the transmission unit. | 01-13-2011 |
20110032973 | RADIO COMMUNICATION SYSTEM AND TRANSMITTING APPARATUS USED FOR THE SAME - To provide a system that can accommodate a greater number of terminals within a limited band and can obtain a higher transmission rate. While the number of frequency signals (spectrums) output in parallel by performing a spread spectrum from the DFT unit of each terminal is 12, the number of sub-carriers constituting one sub-channel is set at 10 or 11. In this case, the users (users A and G) allocated to the sub-channels at both ends of the band will not perform transmission of one frequency signal at the end (one sub-carrier) of all the frequency signals output from the DFT unit, whereas the users (users B to F) allocated to the other sub-channels will not perform transmission of the frequency signals at the ends (two sub-carriers). This transmission can be realized by deleting (clipping) the associated number of signals from both ends or from one end of the frequency signals output from the DFT unit of each terminal and allocating the frequency signals after clipping, to individual sub-channels. | 02-10-2011 |
20110044377 | RADIO COMMUNICATION SYSTEM, TRANSMISSION DEVICE, RECEPTION DEVICE, AND COMMUNICATION METHOD - A clipping rate is controlled in spectrum shaping according to a propagation path to thereby improve transmission characteristics and perform communication at a stable transmission rate. | 02-24-2011 |
20110116566 | WIRELESS COMMUNICATION SYSTEM, TRANSMITTER AND RECEIVER - According to the present invention, a transmitter includes: multiple antennas 15-1, 15-2; a DFT unit 04 configured to transform a time domain signal into a frequency domain signal; a cluster mapping unit 05 configured to divide the frequency domain signal into clusters and to assign the clusters to frequencies on the basis of cluster assignment information; an IDFT unit 06 configured to transform a mapped frequency domain signal into a time domain signal; and cyclic delay setting units 11-1, 11-2 configured to set, for the respective multiple antennas, a cyclic delay amount to the IDFT-transformed time domain signal. | 05-19-2011 |
20110158333 | RADIO COMMUNICATION SYSTEM, RADIO COMMUNICATION METHOD, AND COMMUNICATION DEVICE - A reception device ( | 06-30-2011 |
20110200071 | WIRELESS COMMUNICATION SYSTEM, CONTROL STATION APPARATUS AND TERMINAL APPARATUS - To switch among access schemes of different systems efficiently, in a wireless communication system for selecting one access scheme from among a plurality of access schemes to perform wireless communications in between a control station apparatus and a terminal apparatus, the control station apparatus notifies the terminal apparatus of an access scheme using information indirectly designating the access scheme, and the terminal apparatus selects one access scheme from among a plurality of access schemes according to the notified information to perform wireless communications with the control station apparatus. | 08-18-2011 |
20110212743 | RADIO COMMUNICATION SYSTEM, RADIO COMMUNICATION METHOD, RADIO COMMUNICATION DEVICE, RECEPTION DEVICE, AND PROGRAM - Each of first radio communication devices includes; a frequency spread unit which spreads frequency of a transmitted signal to generate a frequency-spread signal; and a mapping unit which allocates the frequency-spread signal to a subcarrier according to the mapping information which specifies a subcarrier. A second radio communication device includes: a demapping unit which extracts from a received signal a signal of the subcarrier specified by the mapping information; and an inverse frequency spread unit which inverse-frequency-spreads the extracted signal. The first radio communication device or the second radio communication device includes a use subcarrier decision unit that decides a subcarrier to which the frequency-spread-signal is allocated according to a communication path capacity of each subcarrier of each antenna used for transmission by the first radio communication devices and generates mapping information used to specify the decided subcarrier. | 09-01-2011 |
20110228815 | TRANSMISSION APPARATUS, RECEPTION APPARATUS AND COMMUNICATION SYSTEM - In SU-MIMO, even when the channel state of one antenna is poor, an error ratio is improved by obtaining a transmission antenna diversity effect. A transmission apparatus | 09-22-2011 |
20110255624 | MULTIUSER MIMO SYSTEM, RECEIVER, AND TRANSMITTER - Even when respective transmitters use different transmission schemes, signals of the respective transmitters are separated. A receiver that is applied to a multiuser MIMO system in which a plurality of transmitters performs transmission to at least one receiver, includes a MIMO separation part | 10-20-2011 |
20110286382 | RADIO COMMUNICATION SYSTEM AND BASE STATION - Disclosed is a radio communication system including relay stations | 11-24-2011 |
20110286501 | COMMUNICATION APPARATUS AND RECEPTION QUALITY INFORMATION GENERATING METHOD - To enable CQI information to notify the transmission side to be compressed with efficiency, while minimizing the effect on scheduling on the transmission side, provided are reception sections | 11-24-2011 |
20110320920 | CODING APPARATUS, RECEIVING APPARATUS, WIRELESS COMMUNICATION SYSTEM, PUNCTURING PATTERN SELECTING METHOD AND PROGRAM THEREOF - By controlling to select encoding appropriately considering characteristics of equalization and decoding of a receiving apparatus employing a turbo equalization technology, it is possible to attain a high transmission characteristic. Information bits of two systems including a sequence which is input to a first RSC encoding unit | 12-29-2011 |
20120002580 | MOBILE STATION APPARATUS, COMMUNICATION SYSTEM, COMMUNICATION METHOD AND PROGRAM - A mobile station apparatus performs communication with abase station apparatus using a multiple number of component frequency bands, each being a band having a predetermined frequency bandwidth, and includes: a controller setting up a value relating to the transmission power of each component frequency band in accordance with the number of component frequency bands to which radio resources are allocated; and a transmission processor adjusting the transmission power of each component frequency band, based on the value of transmission power set at the controller and transmitting a signal using radio resources of a multiple number of component frequency bands. With this configuration, in a radio communication system using a multiple number of component frequency bands, it is possible to adjust transmission power control in accordance with the number of uplink component frequency bands used for transmission and transmit a signal of a waveform suitable for the radio communication system. | 01-05-2012 |
20120002602 | WIRELESS COMMUNICATION SYSTEM, BASE STATION APPARATUS, MOBILE STATION APPARATUS, AND COMMUNICATION METHOD - TPC is appropriately operated in response to access method switching timing, an error is prevented from occurring in communication, and influence given to another cell due to transmission of unnecessary power is reduced. | 01-05-2012 |
20120063341 | WIRELESS COMMUNICATION SYSTEM, MOBILE STATION APPARATUS, BASE STATION APPARATUS AND WIRELESS COMMUNICATION METHOD - To reduce power consumption in a mobile station apparatus in uplink, while making the system more efficient, the mobile station apparatus has a plurality of transmission antennas | 03-15-2012 |
20120064846 | WIRELESS COMMUNICATION SYSTEM, WIRELESS TRANSMITTER, AND CONTROL PROGRAM FOR WIRELESS TRANSMITTER - By switching between an SFBC and a CDD according to required transmission power in an uplink, the transmission diversity of the uplink is efficiently performed. A wireless transmitter which includes transmitting antennas | 03-15-2012 |
20120093114 | WIRELESS COMMUNICATION SYSTEM, BASE STATION, MOBILE STATION, BASE STATION CONTROL PROGRAM, AND MOBILE STATION CONTROL PROGRAM - A wireless communication system which includes a base station and a mobile station and in which the mobile station performs data transmission to the base station by allocating a transmission signal converted into a frequency signal to contiguous frequency bands or non-contiguous frequency bands divided into a predetermined number, wherein, when retransmission occurs in the data transmission the mobile station has performed by allocating the transmission signal converted into the frequency signal into the non-contiguous frequency bands, the base station determines a transmission power headroom of the mobile station in the allocation of the transmission signal to the non-contiguous frequency bands, and, if a result of the determination shows that there is not a transmission power headroom, the base station instructs the mobile station to allocate the transmission signal to the contiguous frequency bands and to perform the retransmission by increasing transmission power. | 04-19-2012 |
20120093251 | RADIO COMMUNICATION SYSTEM, TRANSMISSION APPARATUS, AND RECEPTION APPARATUS - To provide a radio communication system, a transmission apparatus, a central control unit, and a reception apparatus, which can enhance transmission performances without giving more interference than necessary. The radio communication system in which a plurality of transmission apparatuses | 04-19-2012 |
20120096336 | Transmission Apparatus Reception Apparatus and Communication System - To improve performance of a decoder even in a system with the coder configuration determined by inserting a doping bit sequence known between a transmission apparatus and a reception apparatus in an information bit sequence to transmit, the transmission apparatus is a transmission apparatus that transmits radio signals to the reception apparatus, and is provided with a doping section | 04-19-2012 |
20120120942 | WIRELESS COMMUNICATION SYSTEM, TRANSMITTER AND WIRELESS COMMUNICATION METHOD - To suppress deterioration of channel estimation accuracy even when a terminal moves at high speed in a system for switching among a plurality of insertion patterns of channel estimation signals, in a wireless communication system for using one of a plurality of types of frame formats with different insertion positions of a channel estimation symbol, and spreading data in the frequency domain to perform communications, the types of frame formats include at least a first frame format having a channel estimation symbol in which channel estimation signals are allocated to all subcarriers, and a second frame format having a channel estimation symbol in which a channel estimation signal and data is multiplexed, and PAPR characteristics of a subcarrier for data transmission in the second frame format are the same as PAPR characteristics of a subcarrier for transmitting a symbol assigned only the data. | 05-17-2012 |
20120213054 | RADIO COMMUNICATION METHOD, RADIO COMMUNICATION SYSTEM, AND RADIO TRANSMISSION APPARATUS - A transmission apparatus according to the present invention includes: an encoding section; a modulation section; a variable-SF spreading section that performs spreading with variable SF according to control information A from a control section; an IDFT section that performs IDFT on output from the spreading section; a GI inserting section; a parallel/serial conversion section that converts output from the GI inserting section into a serial data sequence; a digital/analog conversion section; and an RF section that transmits a signal from an antenna after converting the signal to a frequency band for analog signal transmission and controlling it to an appropriate transmission power. The control section is configured to generate control information A for determining the variable SF and input the information A to the variable-SF spreading section and the RF section. In control information A, SF is varied depending on transmission power required. | 08-23-2012 |
20120275410 | WIRELESS COMMUNICATION SYSTEM, BASE STATION APPARATUS, AND FREQUENCY ALLOCATING METHOD - A wireless communication system includes: a plurality of transmitter apparatuses each of which converts a transmitted signal into a frequency signal, then places the frequency signal into a frequency spectrum allocated to the transmitter apparatus and then transmits the signal; and a receiver apparatus that receives the signals transmitted by the plurality of transmitter apparatuses, removes the interference between the signals of the transmitter apparatuses, and separates the signals of the respective transmitter apparatuses; wherein the bandwidth obtained by summing the frequency spectra allocated to the plurality of transmitter apparatus exceeds the allocatable system bandwidth. | 11-01-2012 |
20140119326 | WIRELESS COMMUNICATION SYSTEM, BASE STATION, MOBILE STATION, BASE STATION CONTROL PROGRAM, AND MOBILE STATION CONTROL PROGRAM - A base station which includes a transmission section that is configured to transmit, to a mobile station, first information indicating first control information for controlling a number of transmission antennas of the mobile station for retransmitting transmission data with at least second information indicating a retransmission request and third information indicating second control information for controlling retransmission power for retransmitting the transmission data. The base station also includes a radio section configured to receive, from the mobile station, the transmission data. | 05-01-2014 |
20140126465 | RADIO COMMUNICATION METHOD, RADIO COMMUNICATION SYSTEM, AND RADIO TRANSMISSION APPARATUS - A wireless communication system, method, program, and/or circuitry which includes at least a base station device and a terminal device. The base station device is configured to transmit information indicating a slot for transmitting data by the transmission device. The terminal device is configured to decode the received information using a first communication scheme and transmit data to be allocated to the slot using a second communication scheme to an another terminal device, where the first communication scheme is a different scheme than the second communication scheme. | 05-08-2014 |
20140185594 | RADIO COMMUNICATION SYSTEM, RADIO COMMUNICATION METHOD, RADIO COMMUNICATION DEVICE, RECEPTION DEVICE, AND PROGRAM - 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. | 07-03-2014 |
20140187229 | WIRELESS COMMUNICATION SYSTEM, WIRELESS TRANSMISSION APPARATUS AND WIRELESS TRANSMISSION METHOD - A wireless transmission apparatus that transmits transmission data in each of a plurality of system frequency bands using a transmission power controlled so that a total transmission power of each of the plurality of system frequency bands is less than a maximum transmit power, where the maximum transmit power incase of transmitting the transmission data simultaneously using two or more system frequency bands in the plurality of system frequency bands is less than a maximum transmit power in case of transmitting the transmission data using single system frequency band in the plurality of system frequency band. | 07-03-2014 |
20140219318 | WIRELESS COMMUNICATION SYSTEM, CONTROL STATION APPARATUS AND TERMINAL APPARATUS - A control station apparatus comprising a transmitter that is configured to transmit, to a terminal apparatus, information indicating an allocation method for allocating frequency signals to a plurality of subcarriers, where the information indicates a communication scheme which is one of Single Carrier Frequency Division Multiple Access (SC-FDMA) scheme and Clustered Discrete Fourier Transform-spread-OFDM (Clustered DFT-S-OFDM) scheme. | 08-07-2014 |
20140286461 | COMMUNICATION SYSTEM, COMMUNICATION DEVICE AND COMMUNICATION METHOD THAT CAN IMPROVE FREQUENCY USE EFFICIENCY - 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. | 09-25-2014 |
20140334367 | MOBILE STATION APPARATUS, COMMUNICATION SYSTEM, COMMUNICATION METHOD AND PROGRAM - A mobile station (MS) communicates with a base station using a plurality of component frequency bands, each band of the plurality of component frequency bands being a band having a predetermined frequency bandwidth. The MS sets up an upper limit value of transmission power (TP) of each component frequency band in accordance with the number of component frequency bands to which radio resources are allocated at a time. The MS also adjusts the TP of each component frequency band based on the upper limit value of TP set at the controller, wherein the adjusting of the TP is according to the following formula: | 11-13-2014 |
20150055596 | WIRELESS COMMUNICATION SYSTEM, WIRELESS TRANSMITTER, AND CONTROL PROGRAM FOR WIRELESS TRANSMITTER - A mobile station transmitting transmission signals using one of a plurality of transmission schemes which includes at least a first transmission scheme and a second transmission scheme, where in a case that the used transmission scheme is the first transmission scheme, the transmission signals are applied by an open loop (OL) in which precoding information is not fed back and in a case that the used transmission scheme is the second transmission scheme, the transmission signals are applied by a closed loop (CL) for which a precoding matrix indicator (PMI) is fed back from the mobile station. The first peak-to-average power ratio (PAPR) characteristics of the first transmission scheme differs from the second PAPR characteristics of the second transmission scheme. | 02-26-2015 |