Patent application number | Description | Published |
20080218395 | ANALOG-DIGITAL CONVERTING APPARATUS AND RADIO COMMUNICATION TERMINAL - An analog-digital converting apparatus includes: an analog-digital converting unit that performs a conversion from an analog input signal into a digital output signal; a buffer unit that temporary stores the digital output signal for a plurality of samples and outputs the samples in time-series; a clipping detecting unit that detects a first sample having a signal value corresponding to a clipping level of the analog-digital converting unit from among the samples of the digital output signal; and an interpolating unit that rewrites the signal value of the first sample stored in the buffer unit into an estimated signal value that is obtained by estimating a signal value at a time corresponding to a time of the first sample by an interpolation using at least one of (1) a set of second and third samples that are samples previous to the first sample and (2) a set of fourth and fifth samples that are samples subsequent to the first sample. | 09-11-2008 |
20080227389 | RADIO COMMUNICATION METHOD, RADIO TRANSMISSION APPARATUS AND RECEIVING APPARATUS - A radio communication method including, generating a first transmit RF signal and a second transmit RF signal from a data signal to be transmitted, each of the first and second transmit RF signals having a power spectrum in symmetric shape in the frequency domain, transmitting the first transmit RF signal and the second transmit RF signal at a different time, receiving the first transmit RF signal and the second transmit RF signal to generate a first received RF signal and a second received RF signal, and reproducing the data signal from the first received RF signal and the second received RF signal. | 09-18-2008 |
20080242233 | RADIO TRANSMITTING METHOD AND APPARATUS, AND RADIO RECEIVING METHOD AND APPARATUS - A radio transmitting apparatus includes a storage unit configured to store a plurality of weight sequence sets, which are each assigned to a plurality of transmission blocks sectioned by time axes and frequency axes, by associating the plurality of weight sequence sets with the plurality of transmission blocks, a first selecting unit configured to select one transmission block from the plurality of transmission blocks, a second selecting unit configured to select one weight sequence from one weight sequence set assigned to the one transmission block signal, a converting unit configured to convert a data signal by using the one weight sequence to generate a converted signal, and a transmitting unit configured to transmit the converted signal by using the one transmission block. | 10-02-2008 |
20080267311 | RADIO COMMUNICATION METHOD, RADIO TRANSMISSION APPARATUS AND RECEIVING APPARATUS - A radio communication method including, generating a first transmit RF signal and a second transmit RF signal from a data signal to be transmitted, wherein the first transmit RF signal and the second transmit RF signal being subjected to a code spread by a first spreading code and a second spreading code, respectively forming a symmetric power spectrum in the frequency domain, transmitting the first transmit RF signal and the second transmit RF signal from a transmit antenna at a different time, receiving the first transmit RF signal and the second transmit RF signal to generate a first received RF signal and a second received RF signal, and reproducing the data signal from the first received RF signal and the second received RF signal. | 10-30-2008 |
20100040167 | OFDM SIGNAL TRANSMISSION METHOD AND APPARATUS - An orthogonal frequency division multiplexing (OFDM) signal transmission apparatus which transmits OFDM signals by using a plurality of transmission antennas includes a subcarrier setting device which sets signals for subcarriers so as to use some of the subcarriers of the OFDM signals as pilot subcarriers to transmit pilot signals and use the remaining subcarriers as data subcarriers to transmit data signals, the subcarrier setting device changing polarities of signals for the pilot subcarriers for each transmission antenna. | 02-18-2010 |
20110195657 | RADIO RELAY APPARATUS - According to one embodiment, a radio relay apparatus includes a reception unit, a cancellation unit, a weight calculation unit, and a weight multiplication unit. The reception unit generates M first baseband signals based on M first RF signals supplied by M reception antennas. The cancellation unit subtracts M replicated signals replicating loop interference signals in the M reception antennas, from the respective M first baseband signals, to obtain M second baseband signals. The weight calculation unit calculates M×M weights corresponding to M×M loop interference channels. The weight multiplication unit multiplies the M second baseband signals by the M weights corresponding to the respective M reception antennas and then combines resultant signals together to obtain M replicated signals to be supplied to the cancellation unit. | 08-11-2011 |
20110280190 | WIRELESS COMMUNICATION DEVICE - Broadcast data is divided into a plurality of broadcast channels. Any of the plurality of broadcast channels is placed on a predetermined subcarrier in each of a plurality of main bands such that the placed broadcast channels differ from each other in a same frame and are consecutive in a predetermined order in a frame direction. The subcarriers are converted into a transmit RF signal and the transmit RF signal is transmitted. | 11-17-2011 |
20120063535 | TRANSMITTING APPARATUS AND RECEIVING APPARATUS - According to one embodiment, a transmitting apparatus includes a generation unit, a division unit, an imparting unit and a transmitting unit. The generation unit generates first control information in accordance with a first information format. The division unit divides the first control information into control information pieces in accordance with information format divisions into which the first information format is divided and which include respective pointer regions, each of the information format divisions having a same data length as a second information format. The imparting unit imparts, to the pointer region of each of the information format divisions, a pointer indicating a wireless communication resource used to transmit one of the control information pieces corresponding to one of the information format divisions other than the each control information format division. The transmitting unit transmits the control information pieces. | 03-15-2012 |
20120099668 | TRANSMISSION METHOD, TRANSMITTER, AND RECEIVER FOR MULTI ANTENNA WIRELESS COMMUNICATION SYSTEM - A transmitter includes first generator to generate pilot source signal by modulating pilot sequence, second generator to generate data source signal with time length longer than that of pilot source signal by modulating data sequence, first cyclic shifter to perform cyclic shift of first shift amount to pilot source signal to generate first pilot signal, second cyclic shifter to performs cyclic shift of second shift amount to data source signal to generate first data signal, third cyclic shifter to perform cyclic shift of third shift amount to pilot source signal to generate second pilot signal, fourth cyclic shifter to perform cyclic shift of fourth shift amount to data source signal to generate second data signal, first transmit antenna to transmit first pilot signal and first data signal, and second transmit antenna to transmit second pilot signal and second data signal. | 04-26-2012 |
20120242161 | RADIO POWER TRANSMITTING APPARATUS AND RADIO POWER TRANSMITTING SYSTEM - There is provided a radio power transmitting apparatus including: a power transmitting coil, a band signal generating unit, a reflected signal measuring unit, an oscillator and a communication control unit. The coil is supplied with a signal and transmits the signal to a power receiving coil on a radio power receiving apparatus through magnetic coupling. The generating unit generates a band signal having an allowable transmission band and supplies the band signal to the power transmitting coil. The reflected signal measuring unit measures a reflected signal of the band signal from the power transmitting coil. The oscillator generates a carrier signal having a controllable oscillating frequency. The control unit determines a transmission frequency based on a frequency characteristic of the reflected signal and performs control so that a transmission signal generated by modulating the carrier signal of the transmission frequency is supplied to the power transmitting coil. | 09-27-2012 |
20130129001 | TRANSMISSION METHOD, TRANSMITTER, AND RECEIVER FOR MULTI ANTENNA WIRELESS COMMUNICATION SYSTEM - A transmitter includes first generator to generate pilot source signal by modulating pilot sequence, second generator to generate data source signal with time length longer than that of pilot source signal by modulating data sequence, first cyclic shifter to perform cyclic shift of first shift amount to pilot source signal to generate first pilot signal, second cyclic shifter to performs cyclic shift of second shift amount to data source signal to generate first data signal, third cyclic shifter to perform cyclic shift of third shift amount to pilot source signal to generate second pilot signal, fourth cyclic shifter to perform cyclic shift of fourth shift amount to data source signal to generate second data signal, first transmit antenna to transmit first pilot signal and first data signal, and second transmit antenna to transmit second pilot signal and second data signal. | 05-23-2013 |
20130210478 | WIRELESS COMMUNICATION SYSTEM AND WIRELESS COMMUNICATION APPARATUS, BOTH FOR USE IN BROADCAST WIRELESS TRANSMISSION - According to one embodiment, a wireless terminal communicates with a server via wireless base stations. The wireless terminal has devices which transmit a signal in a normal-power transmission mode and the signal in a low-power transmission mode, a power control device which switches the normal-power transmission mode to the low-power transmission mode, or vice versa, and a device which transmits current position data to the server. The server detects the position of the wireless terminal, designates one of the base stations which is close to the wireless terminal, when the wireless terminal is set to the low-power transmission mod, and detects whether the base station designated has a problem or not according to detect the signal from the wireless terminal. | 08-15-2013 |
20140204769 | FAILURE DETECTION APPARATUS AND METHOD - According to one embodiment, a failure detection apparatus includes a communicator, a selector, an execution unit, and a determiner. The communicator communicates with a wireless terminal mounted on a moving object via at least one of first bridge devices located at predetermined positions. The selector selects second bridge devices from the first bridge devices. The execution unit executes test connections to the wireless terminal using the second bridge devices. The determiner determines that the wireless terminal is inoperative if the test connection via any of the second bridge devices has failed. | 07-24-2014 |
20140320348 | POSITION ESTIMATING DEVICE, POSITION ESTIMATING METHOD, AND WIRELESS COMMUNICATION SYSTEM - According to this embodiment, a position estimating device, that estimates a position of a target wireless device, includes a storage that stores positions of a plurality of reference wireless devices, a receiver which is notified of a received signal strength indicator value in signal transmission and reception between the target wireless device and each reference wireless device, a calculator that calculates a standard deviation for a probability distribution of a distance between the target wireless device and each reference wireless device, using the received signal strength indicator value, a first estimator that calculates an estimated distance between the target wireless device and each reference wireless device, using the received signal strength indicator value, and a second estimator that calculates the position of the target wireless device, using the standard deviation, the estimated distance, and the positions of the plurality of reference wireless devices. | 10-30-2014 |
20140323037 | WIRELESS COMMUNICATION DEVICE AND METHOD, AND PROGRAM - A wireless communication device transmits data to a relay destination being one of first relaying devices capable of communicating out of relaying devices; obtains first information, from each first relaying device, that indicates a representative value of remaining operating times of relaying devices present on a relay route from the first relaying device to a target device; determines to perform a new route search, based on the first information; increases a transmission power; then transmits a request; receive responses from all or a part of second relaying devices, which are relaying devices that have received the request, including pieces of second information each of which indicates a representative value of remaining operating times of relaying devices present on a relay route from the second relaying device to the target device; and selects a relay destination of data from among the second relaying devices based on the pieces of second information. | 10-30-2014 |
20150016273 | MONITORING APPARATUS AND METHOD - According to one embodiment, a monitoring apparatus includes a communication unit and a determination unit. The communication unit is configured to calculate a first indicator value and a second indicator value, the first indicator value relating to a received signal strength at a time when a packet transmitted from a first wireless device is received, the second indicator value relating to a received signal strength at a time when carrier sense is executed. The determination unit is configured to determine a state of the first wireless device to be one of three or more states, by performing a state determination using the first indicator value and the second indicator value, with a current state of the first wireless device being set as a basic point. | 01-15-2015 |
20150049794 | Communication Device and Method - A communication device includes a signal processing device, a transceiver, and a controller. The signal processing device uses a first signal medium. The transceiver communicates with at least one of first devices by using a second signal medium. The controller controls usage of the first signal medium by the communication device and the at least one of first devices by communicating with the at least one of first devices by the transceiver. | 02-19-2015 |
20150063492 | TRANSMISSION METHOD, TRANSMITTER, AND RECEIVER FOR MULTI ANTENNA WIRELESS COMMUNICATION SYSTEM - A transmitter includes first generator to generate pilot source signal by modulating pilot sequence, second generator to generate data source signal with time length longer than that of pilot source signal by modulating data sequence, first cyclic shifter to perform cyclic shift of first shift amount to pilot source signal to generate first pilot signal, second cyclic shifter to performs cyclic shift of second shift amount to data source signal to generate first data signal, third cyclic shifter to perform cyclic shift of third shift amount to pilot source signal to generate second pilot signal, fourth cyclic shifter to perform cyclic shift of fourth shift amount to data source signal to generate second data signal, first transmit antenna to transmit first pilot signal and first data signal, and second transmit antenna to transmit second pilot signal and second data signal. | 03-05-2015 |