Abstract: A wireless communication apparatus that allocates radio resources is a base station or a mobile station that transmits a data series on a frequency channel in a frequency hopping pattern corresponding to a radio resource time slot. The apparatus includes a transmission quality measurement unit that measures radio waves in a frequency band used in the transmission of the data series and evaluates transmission quality, and the radio resources including a reserved resource and spare resources, a resource allocation unit that allocates, to the mobile station lower than or equal to a threshold value in transmission quality of a frequency channel used in a reserved resource time slot, a time slot that improves frequency channel transmission quality, of spare resource time slots.

Abstract: A radio transmission device includes: a known signal generating unit that generates a first known signal and a second known signal mapped in such a manner that subcarriers for transmitting a first signal not being 0 do not overlap with each other in symbols of one time band; an IDFT unit that converts the first known signal and the second known signal from a frequency domain signal into a time domain signal; a GI inserting unit that inserts a guard interval into the first known signal and the second known signal converted into time domain signals; a transmission antenna that transmits the first known signal in which the guard interval is inserted; and a transmission antenna that transmits the second known signal in which the guard interval is inserted.

Abstract: A wireless communication apparatus that allocates radio resources is a base station or a mobile station that transmits a data series on a frequency channel in a frequency hopping pattern corresponding to a radio resource time slot. The apparatus includes a transmission quality measurement unit that measures radio waves in a frequency band used in the transmission of the data series and evaluates transmission quality, and the radio resources including a reserved resource and spare resources, a resource allocation unit that allocates, to the mobile station lower than or equal to a threshold value in transmission quality of a frequency channel used in a reserved resource time slot, a time slot that improves frequency channel transmission quality, of spare resource time slots.

Abstract: In a wireless communication system, SINR data are obtained from power measurements data, as follows: gathering first power measurements data of total power received during communications; gathering second power measurements data of in-transmission interference power; computing third power measurements data of useful power, from the first and second power measurements data; gathering fourth power measurements data of out-transmission interference power; merging the second and fourth power measurements data so as to form a set of fifth interference power data; computing a first characteristic function from the third power measurements data, and computing a second characteristic function from the fifth power measurements data; building a third characteristic function relating to the SINR data related to the transmission channel, by performing a term-by-term product of the first and second characteristic functions; computing a probability mass function from the third characteristic function.

Abstract: An interference identification device according to the present invention includes a feature calculation unit that calculates, using an electromagnetic wave received during a sample data analysis length, at least one type of feature of the electromagnetic wave, an interference identification unit that identifies a cluster to which the at least one type of feature belongs, among a plurality of clusters, each of the plurality of clusters having a region defined in a cluster space in which one type of feature corresponds to one dimension, and a sample data analysis length update unit that updates the sample data analysis length based on a distance, in the cluster space, between the at least one type of feature and the cluster.

Abstract: A radio transmission device includes: a known signal generating unit that generates a first known signal and a second known signal mapped in such a manner that subcarriers for transmitting a first signal not being 0 do not overlap with each other in symbols of one time band; an IDFT unit that converts the first known signal and the second known signal from a frequency domain signal into a time domain signal; a GI inserting unit that inserts a guard interval into the first known signal and the second known signal converted into time domain signals; a transmission antenna that transmits the first known signal in which the guard interval is inserted; and a transmission antenna that transmits the second known signal in which the guard interval is inserted.

Abstract: There are provided: a resource allocation unit that performs resource allocation of selecting a frequency channel with good transmission quality on the basis of transmission quality of each frequency channel, and preferentially allocating a time slot in a frequency hopping pattern corresponding to the selected frequency as a time slot to be used for transmission of a data sequence; and a ground control unit that controls transmission of the data sequence using the time slot allocated by the resource allocation unit and the frequency channel.

Abstract: An interference identification device according to the present invention includes a feature calculation unit that calculates, using an electromagnetic wave received during a sample data analysis length, at least one type of feature of the electromagnetic wave, an interference identification unit that identifies a cluster to which the at least one type of feature belongs, among a plurality of clusters, each of the plurality of clusters having a region defined in a cluster space in which one type of feature corresponds to one dimension, and a sample data analysis length update unit that updates the sample data analysis length based on a distance, in the cluster space, between the at least one type of feature and the cluster.

Abstract: A wireless communication apparatus includes a channel-usage selection unit to select one frequency channel for each time slot from a plurality of predetermined candidate frequency channels, and a wireless communication unit to perform wireless communication by using the frequency channel selected by the channel-usage selection unit. The channel-usage selection unit selects a frequency channel that is different from a frequency channel to be used in a same time slot by an adjacent cell located at a cell interval, equal to or smaller than the predetermined first number of cells, from a cell used for the wireless communication, and allows the frequency channel selected to overlap with the frequency channel to be used in the same time slot by a remote cell located at a cell interval, greater than the first number of cells and equal to or smaller than the number of the candidate frequency channels, from a cell used for the wireless communication.

Abstract: A wireless receiving device includes a signal measurement unit; a weighting factor generation unit that generates weighting factors each for suppression of the received signals, based on measurement results of the received signals; interference suppression units that each perform, in a parallel manner, interference suppression processing on the received signals, using, one of the weighting factors; arrival detection units that are connected in one-to-one to the interference suppression units, the arrival detection units each detecting arrival of a desired signal; an arrival determination unit that determines whether the desired signal has arrived; and a demodulation processing unit that demodulates the received signals when the arrival determination unit determines that the desired signal has arrived.

Abstract: A wireless communication apparatus includes a channel-usage selection unit to select one frequency channel for each time slot from a plurality of predetermined candidate frequency channels, and a wireless communication unit to perform wireless communication by using the frequency channel selected by the channel-usage selection unit. The channel-usage selection unit selects a frequency channel that is different from a frequency channel to be used in a same time slot by an adjacent cell located at a cell interval, equal to or smaller than the predetermined first number of cells, from a cell used for the wireless communication, and allows the frequency channel selected to overlap with the frequency channel to be used in the same time slot by a remote cell located at a cell interval, greater than the first number of cells and equal to or smaller than the number of the candidate frequency channels, from a cell used for the wireless communication.

Abstract: In a wireless communication system, SINR data are obtained from power measurements data, as follows: gathering first power measurements data of total power received during communications; gathering second power measurements data of in-transmission interference power; computing third power measurements data of useful power, from the first and second power measurements data; gathering fourth power measurements data of out-transmission interference power; merging the second and fourth power measurements data so as to form a set of fifth interference power data; computing a first characteristic function from the third power measurements data, and computing a second characteristic function from the fifth power measurements data; building a third characteristic function relating to the SINR data related to the transmission channel, by performing a term-by-term product of the first and second characteristic functions; computing a probability mass function from the third characteristic function.

Abstract: A radio wave monitoring apparatus includes a communication quality evaluation unit which notifies degradation of communication quality of wireless communication when a non-transmission probability exceeds a threshold, the non-transmission probability having been calculated based on measurement results of communication quality of wireless communication between an on-board station mounted on a train traveling on a track and ground stations installed along the track, and a condition by which it is determined that transmission information is unreachable in the wireless communication.

Abstract: An on-board wireless apparatus mounted on one vehicle constituting a train includes a wireless reception unit capable of receiving a wireless signal transmitted from a ground wireless apparatus installed on the ground, and a wireless transmission unit capable of transmitting a wireless signal to the ground wireless apparatus. In the on-board wireless apparatus, a parameter indicating reliability of wireless communication is different between wireless communication between the on-board wireless apparatus and the ground wireless apparatus, and wireless communication between another on-board wireless apparatus mounted on the same vehicle on which the on-board wireless apparatus is mounted and the ground wireless apparatus.

Abstract: A wireless receiving device includes a signal measurement unit that measures received signals; a weighting factor generation unit that generates weighting factors each for suppression of the received signals, based on measurement results of the received signals; interference suppression units that each perform, in a parallel manner, interference suppression processing on the received signals, using one of the weighting factors, the one weighting factor used by one of the interference suppression units being different from weighting factors used by other interference suppression units, the plurality of weighting factors being generated at different points of time; arrival detection units that are connected in one-to-one to the interference suppression units, the arrival detection units each detecting arrival of a desired signal, using received signals that have been subjected to the interference suppression processing in the corresponding interference suppression unit connected thereto; an arrival determinatio

Abstract: A radio wave monitoring apparatus includes a communication quality evaluation unit which notifies degradation of communication quality of wireless communication when a non-transmission probability exceeds a threshold, the non-transmission probability having been calculated based on measurement results of communication quality of wireless communication between an on-board station mounted on a train traveling on a track and ground stations installed along the track, and a condition by which it is determined that transmission information is unreachable in the wireless communication.

Abstract: A transmitter includes: a null symbol map unit to determine a null symbol arrangement pattern by combining different unit patterns determining positions of data symbols and null symbols; a subcarrier map unit to assign, in a two-dimensional space defined by a plurality of subcarriers for use in multicarrier transmission and a time series represented in units of time determined in accordance with a single symbol, transmission data to positions of data symbols of the respective subcarriers determined in accordance with the null symbol arrangement pattern; a modulator to generate the data symbols by modulating the assigned transmission data, assign null symbols having a power of 0 to positions of null symbols of the respective subcarriers determined in accordance with the null symbol arrangement pattern, and generate transmission symbols of the respective subcarriers; and a baseband section to output a baseband signal based on the transmission symbols.

Abstract: For determining time and frequency resources, a first device performs: obtaining groups of time and frequency resources of the wireless communications network so as to form a redrawn grid; allocating time and frequency resources according to the redrawn grid and to a frequency hopping criteria; and providing signalling information representative of the time and frequency resources that have been allocated according to the redrawn grid. In order to determine which time and frequency resources of the initial grid to be used for performing said transmissions, a second device performs: obtaining the signalling information so as to determine the time and frequency resources that have been allocated according to the redrawn grid; and applying a predetermined pattern mask onto the determined time and frequency resources that have been allocated according to the redrawn grid.

Abstract: A transmitter includes: a null symbol map unit to determine a null symbol arrangement pattern by combining different unit patterns determining positions of data symbols and null symbols; a subcarrier map unit to assign, in a two-dimensional space defined by a plurality of subcarriers for use in multicarrier transmission and a time series represented in units of time determined in accordance with a single symbol, transmission data to positions of data symbols of the respective subcarriers determined in accordance with the null symbol arrangement pattern; a modulator to generate the data symbols by modulating the assigned transmission data, assign null symbols having a power of 0 to positions of null symbols of the respective subcarriers determined in accordance with the null symbol arrangement pattern, and generate transmission symbols of the respective subcarriers; and a baseband section to output a baseband signal based on the transmission symbols.

Abstract: A radio communication apparatus that performs radio communication according to a multicarrier scheme includes: a transmitting unit including a null inserting unit that dispersedly arranges null symbols in a two-dimensional space of time and frequency in radio data, and a differential modulating unit that performs differential modulation on a data symbol part other than the null symbols; and a receiving unit including an interference measuring unit that measures interference power for a data symbol that is a measurement target by using a null symbol adjacent to the data symbol in the two-dimensional space of time and frequency, and a delay detecting unit that performs weighting on each data symbol according to the interference power measured for each data symbol and that performs delay detection between data symbols.