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Kenichi Higuchi
Kenichi Higuchi, Saitama-Shi JP
| Patent application number | Description | Published |
|---|---|---|
| 20100309808 | MOBILE COMMUNICATION SYSTEM, BASE STATION APPARATUS, USER EQUIPMENT, AND METHOD - A base station apparatus is used in a mobile communication system in which at least a shared data channel is transmitted by an orthogonal modulation scheme using an I-channel and a Q-channel. The base station apparatus includes a providing unit providing Acknowledgement/Non-Acknowledgement information indicating whether retransmission of a signal received in uplink is required; a mapping unit mapping a number of multiplexed users of the Acknowledgement/Non-Acknowledgement information to the I-channel or the Q-channel based on a predetermined mapping table; and a reporting unit reporting the Acknowledgement/Non-Acknowledgement information to the respective users. The mapping table indicates that, when the number of the multiplexed users is equal to or less than a predetermined number, the Acknowledgement/Non-Acknowledgement information is associated with the I-channel or the Q-channel, and otherwise, the Acknowledgement/Non-Acknowledgement information is associated with the I-channel and the Q-channel. | 12-09-2010 |
| 20100310025 | TRANSMITTING AND RECEIVING APPARATUSES AND METHODS - A transmitting apparatus which transmits a transmit symbol in orthogonal-frequency division multiplexing (OFDM) is disclosed. The transmitting apparatus includes a unit which provides a unicast channel; a unit which provides a multimedia broadcast multicast service (MBMS) channel; a unit which provides a specific pilot channel which is specific to a specified cell; a unit which provides one or more common pilot channels common to a plurality of cells; and a multiplexing unit which multiplexes the unicast channel, the MBMS channel, the specific pilot channel, and the one or more common pilot channels, and creates the transmit symbol, wherein the multiplexing unit time-division multiplexes, in the same frequency band, a unicast frame which includes the unicast channel, and an MBMS frame which includes the MBMS channel, and wherein an insertion density of the common pilot channel included in the MBMS frame is larger than an insertion density of the specific pilot channel included in the unicast frame. | 12-09-2010 |
| 20100316162 | TRANSMITTING APPARATUS AND METHOD IN MOBILE COMMUNICATIONS SYSTEM - A transmitting apparatus in a mobile communications system is disclosed. The apparatus includes: a data modulating unit which maps a predetermined number of data sets to one or more reference signal points of a symbol constellation; an inverse Fourier transforming unit which inverse Fourier transforms a data-modulated signal, generating a time-domain signal; a peak suppressing unit which suppresses the time-domain signal such that a peak power decreases when the time-domain signal meets a predetermined condition; a Fourier transforming unit which Fourier transforms the peak-suppressed signal and generates a frequency-domain signal; and a modifying unit which modifies the frequency-domain signal, and provides the modified signal to the inverse Fourier transforming unit, wherein the modifying unit is arranged to move, when a peak-suppressed signal point in the symbol constellation does not belong to a predetermined surrounding area, the peak-suppressed signal point to a point within the surrounding area. | 12-16-2010 |
| 20100329393 | MOBILE COMMUNICATION SYSTEM, RECEIVING DEVICE, AND METHOD - A transmitting device Fourier-transforms symbols in a transmission symbol sequence, maps the Fourier-transformed symbols to subcarriers, inverse-Fourier-transforms the mapped symbols, and transmits the inverse-Fourier-transformed symbols from multiple transmitting antennas. A receiving device Fourier-transforms received signals, extracts signal components mapped to the subcarriers, and estimates the symbols transmitted via the subcarriers by applying a QR decomposition algorithm to the extracted signal components. The receiving device obtains a unitary matrix Q | 12-30-2010 |
| 20110064044 | TRANSMISSION APPARATUS, RECEPTION APPARATUS, MOBILE COMMUNICATIONS SYSTEM AND TRANSMISSION CONTROL METHOD - A disclosed transmission apparatus comprises a switching portion that switches radio access methods; a frequency domain signal generation portion that allocates a radio resource to a spread chip sequence on which one of a fast Fourier transformation and a series/parallel conversion is performed in accordance with the switched radio accessed method, so as to generate a signal in a frequency domain; and a transmission signal generation portion that performs a fast inverse Fourier transformation on the signal in the frequency domain so as to generate a transmission signal. | 03-17-2011 |
| 20110085514 | BASE STATION, MOBILE STATION, AND COMMUNICATIONS METHOD - A base station carrying out communications with a mobile station with an Orthogonal Frequency Division Multiplexing (OFDM) method by using a predetermined frequency band out of a transmission band is disclosed. The base station includes an allocation portion that allocates, for a mobile station performing peripheral cell search, a band that includes a center frequency on a raster of a first band and has a bandwidth equal to or greater than a bandwidth of a second band with which a synchronization channel is transmitted. | 04-14-2011 |
| 20110149896 | BASE STATION AND MOBILE STATION - One aspect of the present invention relates to a base station wherein either resource blocks resulting from division of a system bandwidth into blocks of consecutive frequency subcarriers or distributed type resource blocks consisting of frequency subcarriers discretely distributed within the system bandwidth and resulting from segmentation of the resource blocks into multiple resource blocks are assigned to mobile stations, the base station including: a scheduling unit configured to assign either the resource blocks or the distributed type resource blocks to the mobile stations at a predefined assignment cycle based on respective downlink reception channel states transmitted from the mobile stations. | 06-23-2011 |
Kenichi Higuchi, Yokohama-Shi JP
| Patent application number | Description | Published |
|---|---|---|
| 20080253432 | NOISE POWER ESTIMATION APPARATUS, NOISE POWER ESTIMATION METHOD AND SIGNAL DETECTION APPARATUS - A noise power estimation apparatus is disclosed. The noise power estimation apparatus includes: a part for calculating correlation between a received signal and a pilot signal so as to obtain a received power of the pilot signal for each path; a part for removing a multipath interference component from the received power of the pilot signal by using a predetermined power ratio between the pilot signal and a data signal so as to obtain a corrected received power of the pilot signal; a part for estimating an estimated total power of the pilot signal and the data signal included in the received signal based on the corrected received power and the predetermined power ratio; and a part for subtracting the estimated total power from a total power of the received signal so as to obtain a noise power. | 10-16-2008 |
| 20090154584 | APPARATUS AND METHOD FOR COMMUNICATION IN VARIABLE BANDS - A transmitter according to the present invention includes a mapping unit configured to convert transmitted data into data pieces associated with individual subcarriers, an inverse Fourier transform unit configured to convert the data pieces into a time-series signal, and a symbol generation unit configured to generate symbols for radio transmission from the time-series signal. The mapping unit associates the transmitted data with subcarriers different from predefined multiple subcarriers arranged at even intervals on a frequency axis. A demapping unit of a receiver according to the present invention supplies data comprising the data pieces associated with the subcarriers different from the predefined multiple subcarriers arranged at even intervals on a frequency axis as the data for restoration. | 06-18-2009 |
| 20110038434 | RADIO PARAMETER GROUP GENERATING APPARATUS, TRANSMITTER AND RECEIVER - An apparatus for generating sets of radio parameters includes a first deriving unit deriving a set of radio parameters for specifying a symbol including an effective symbol part with the same period as the effective symbol part specified by another set of radio parameters and a guard interval part with a different period from the guard interval part specified by the other set of radio parameters. The apparatus further includes a second deriving unit deriving a set of radio parameters so that an occupancy proportion of the guard interval part in a single symbol specified by another set of radio parameters is equal to an occupancy proportion of the guard interval part in a single symbol specified by the other set of radio parameters. | 02-17-2011 |
Kenichi Higuchi, Tokyo JP
| Patent application number | Description | Published |
|---|---|---|
| 20090034638 | RADIO PARAMETER GROUP GENERATING APPARATUS, TRANSMITTER AND RECEIVER - An apparatus for generating sets of radio parameters includes a first deriving unit deriving a set of radio parameters for specifying a symbol including an effective symbol part with the same period as the effective symbol part specified by another set of radio parameters and a guard interval part with a different period from the guard interval part specified by the other set of radio parameters. The apparatus further includes a second deriving unit deriving a set of radio parameters so that an occupancy proportion of the guard interval part in a single symbol specified by another set of radio parameters is equal to an occupancy proportion of the guard interval part in a single symbol specified by the other set of radio parameters. | 02-05-2009 |
| 20090280749 | RADIO COMMUNICATION APPARATUS AND METHOD - In a radio communication system, a downlink frequency band includes a plurality of frequency blocks including one or more carrier frequencies, and one or more frequency blocks are used for data transmission to a single user. A radio communication apparatus for use in the communication system has an evaluation unit evaluating the quality of a received signal for each frequency block and storing plurality of stored quality evaluations of the received signal, a comparison unit comparing the plural quality evaluations of the received signal, and a transmission unit transmitting a predetermined number of the quality evaluations of the received signal over an uplink control channel. | 11-12-2009 |
| 20100235710 | SIGNAL TRANSMISSION METHOD AND TRANSMITTER IN RADIO MULTIPLEX TRANSMISSION SYSTEM - A disclosed signal transmission method in a radio multiplex transmission system comprises the steps of: serial-to-parallel converting serial data to be transmitted into N (N: two or more) parallel data series; independently performing an error-correcting encoding process on the parallel signals of the N data series serial-to-parallel converted; parallel-to-serial converting the parallel signals encoded with error-correcting codes; performing an interleaving process on the parallel-to-serial converted signals; serial-to-parallel converting the interleaved signals into L (L: two or more) parallel data series and transmitting each of the L data series using L antennas; receiving the transmitted signals; separating the received signals into M (M: two or more) data series and parallel-to-serial converting the M data series; performing a deinterleaving process on the parallel-to-serial converted signals; serial-to-parallel converting the deinterleaved signals into N data series; independently performing an error-correcting decoding process on the parallel signals of the N data series serial-to-parallel converted; and parallel-to-serial converting the signals in which the error-correcting codes are decoded, thereby recovering the transmitted data. | 09-16-2010 |
Kenichi Higuchi, Yokohama-Shi, Kanagawa JP
| Patent application number | Description | Published |
|---|---|---|
| 20100158256 | BASE STATION AND DOWNLINK CHANNEL TRANSMISSION METHOD - Under a sectorized cell architecture in a mobile communication system, a scrambling code applied to multiplication of a transmission signal is selected and switched among different types of downlink physical channels in a unified manner. One of multiple transmission signals to be transmitted on a corresponding one of the different types of downlink physical channels is generated. A first code is selected according to the type of the physical channel to enable multiplying the transmission signal by the first code. The transmission signal is multiplied by an intracell common scrambling code used in common among sectors in a same cell in addition to or in place of the multiplication of the first code. The transmission signal multiplied by at least one of the first code and the intracell common scrambling code is transmitted on the corresponding physical channel. | 06-24-2010 |
Kenichi Higuchi, Chiyoda-Ku, Tokyo JP
| Patent application number | Description | Published |
|---|---|---|
| 20090149129 | TRANSMISSION AND RECEPTION BANDWIDTH SETTING METHOD, MOBILE TERMINAL, AND BASE STATION IN RADIO COMMUNICATION SYSTEM DEFINING A PLURALITY OF SIGNAL BANDWIDTHS - In a radio communication system defining a plurality of bandwidths, mobile terminals of kinds respectively corresponding to the plurality of bandwidths are accommodated in the system, and a minimum transmission bandwidth of the plurality of bandwidths is set as a transmission bandwidth of a downlink common channel. Or, every mobile terminal accommodated in the radio communication system is provided with a capability for processing a bandwidth equal to or greater than a predetermined value, and equal to or more than two transmission bandwidths that are equal to or less than a predetermined value are set as a transmission bandwidth of a downlink common channel. In the latter case, the mobile terminal identifies a bandwidth of a received downlink common channel. | 06-11-2009 |