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: 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 reception device includes: a reception unit receiving transmission signals; a splitting unit splitting received signals into real component and imaginary component; a narrowing unit narrowing down possible signal point candidates of real component of the signal and imaginary component of the signal to signal point candidates based on the real component and the imaginary component of the split received signal; a signal point candidate hypothesizing unit hypothesizing one signal point candidate of real component from the signal point candidates of real component obtained by narrowing-down and hypothesizing one signal point candidate of imaginary component from the signal point candidates of imaginary component obtained by narrowing-down; and a signal estimation value calculating unit estimating real component of the signal based on the one hypothesized real component signal point candidate and estimating imaginary component of the signal based on the one hypothesized imaginary component signal point candidate

Abstract: A communication device includes a signal determiner determining whether there is a reception signal, and a period estimator estimating an interruption period of interruption of a signal transmitted from a device as a source of the reception signal, using a determination result from the signal determiner.

Abstract: A communication device includes a signal determiner determining whether there is a reception signal, and a period estimator estimating an interruption period of interruption of a signal transmitted from a device as a source of the reception signal, using a determination result from the signal determiner.

Abstract: A reception device includes: a reception unit receiving transmission signals; a splitting unit splitting received signals into real component and imaginary component; a narrowing unit narrowing down possible signal point candidates of real component of the signal and imaginary component of the signal to signal point candidates based on the real component and the imaginary component of the split received signal; a signal point candidate hypothesizing unit hypothesizing one signal point candidate of real component from the signal point candidates of real component obtained by narrowing-down and hypothesizing one signal point candidate of imaginary component from the signal point candidates of imaginary component obtained by narrowing-down; and a signal estimation value calculating unit estimating real component of the signal based on the one hypothesized real component signal point candidate and estimating imaginary component of the signal based on the one hypothesized imaginary component signal point candidate

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 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: An antenna control device controls a plurality of antennas used for communicating with a mobile station that moves along a predetermined path in a radio communication system that includes a plurality of linear cells, each of which is formed by the antennas and in each of which each of the antennas sets a directionality in a same direction as a path of the mobile station and transmits an identical signal at an identical frequency, and that has two frequencies recurrently allocated in such a manner that adjacent linear cells use different frequencies for transmission. The antenna control device adjusts, in each of the linear cells, power distribution to each of the antennas that form the linear cell so as to be gradually decreased with distance in a direction of antenna directionality of each of the antennas.

Abstract: In a DSTBC system, to obtain a communication system capable of estimating a transmission path without reducing a transmission capacity. The communication system includes a transmission device and a reception device that perform communication in the DSTBC system, in which the transmission device performs, as a start symbol of DSTBC, the start symbol including known signals one of which has signal power and the other of which are set to signal power of zero and transmits the known signals to the reception device, and the reception device independently estimates a transmission path between each of transmitting antennas of the transmission device and a receiving antenna of the reception device itself by using the space-time coded start symbol received from the transmission device, and decodes a reception signal with DSTBC decoding employing synchronous detection.