Patent application number | Description | Published |
20090125793 | WIRELESS COMMUNICATION APPARATUS AND WIRELESS COMMUNICATION METHOD - The invention is embodied for solving a problem of occurrence of degradation of the reception characteristic caused by the interference signal component if a symbol making a determination error is contained or if an error factor caused by a propagation channel estimation error or a hardware error (carrier frequency error, sampling frequency error) is contained at the interference canceling time in a wireless communication apparatus for iteratively decoding and receiving a spatial multiplex signal. A wireless communication apparatus | 05-14-2009 |
20100159842 | WIRELESS DISTANCE MEASUREMENT SYSTEM AND WIRELESS DISTANCE MEASUREMENT METHOD - A wireless distance measurement system and a wireless distance measurement method that measure the distance between a base station and a terminal without clock synchronization between a plurality of base stations, and without requiring input of the position relationships between a plurality of base stations. Clock phase shift section ( | 06-24-2010 |
20100183102 | RADIO COMMUNICATION DEVICE AND RADIO COMMUNICATION METHOD - A radio receiver which performs iterative decoding of a received signal is provided. The radio receiver comprises: a receiving unit receiving a signal on a symbol-by-symbol basis; a demodulation unit ( | 07-22-2010 |
20110133988 | RADIO ARRIVAL DIRECTION ESTIMATION DEVICE AND RADIO ARRIVAL DIRECTION ESTIMATION METHOD - A radio arrival direction estimation device that accurately estimates the arrival direction of radio waves from a desired tag, even when there are multiple antennas disposed at short intervals. When ID detection timing is provided from a timing detector ( | 06-09-2011 |
20110140970 | BASE STATION DEVICE AND DISTANCE MEASURING METHOD - Provided are a distance measuring device and a distance measuring method which can easily distinguish a reflected signal from a desired tag from an unnecessary wave so as to improve the distance measuring accuracy even when IR-UWB is used for measuring a distance. The method uses a reader ID indicated by a code string formed by P bits (P is a natural number) for identifying a base station and a tag ID indicated by a code string formed by Q bits (Q is a natural number) for identifying a radio terminal. The method generates a unique word containing P pulses, each of which is ON/OFF-modulated depending on whether each of P bits indicating the reader ID is 1 or 0. The method generates a frame containing 2 M unique words and a burst containing Q frames. The method further outputs a transmission signal containing a plurality of bursts. A radio terminal ASK-modulates the transmission signal depending on whether each of the Q bits indicating the tag ID is 1 or 0. The ASK-modulated signal is sampling-received at timings of different phases by 1/M (M is an integer not smaller than 1) of the transmission clock cycle. | 06-16-2011 |
20120014412 | POSITIONING SYSTEM AND POSITIONING METHOD - A positioning system and a positioning method which suppress the occurrence of jitter to improve positioning accuracy. A base station ( | 01-19-2012 |
20120032850 | ARRAY SIGNAL PROCESSING DEVICE - Provided is an array signal processing device capable of, when a spatial averaging method is applied to array signal processing, reducing the number of antennas constituting an array antenna while making use of the spatial averaging method. In the array signal processing device ( | 02-09-2012 |
20120044974 | RADIO TERMINAL DEVICE, RADIO BASE STATION DEVICE, RADIO RANGING SYSTEM, AND RADIO RANGING METHOD - Disclosed are a radio terminal device and the like, which achieve an improvement in the accuracy of ranging between a UWB reader and a UWB tag regardless of whether an active method or a semi-passive method. In a terminal ( | 02-23-2012 |
20130113653 | RADAR DEVICE - The disclosed technique includes transmitting a signal intermittently according to a transmission cycle having a predetermined transmission period and a non-transmission period; receiving the signal reflected from a target with reception antennas; and detecting the target from the reflected signal. A high-frequency transmission signal attenuated during the transmission period and a receipt signal received during the non-transmission period are combined together. A correlation value between a reference transmission signal and the receipt signal in the combined signal is calculated, and the amount of phase shift in an arbitrarily selected reception antenna is calculated from the correlation value of a reference reception antenna, and the correlation values of the other reception antennas. The phase component of the correlation value of the arbitrarily selected reception antenna is corrected on the basis of the amount of phase shift. | 05-09-2013 |
20130120185 | RADAR APPARATUS - A radar apparatus transmits a radio frequency transmission signal from a transmitter antenna in a given transmission period, and receives a signal of a reflected wave reflected by a target via a receiver antenna. The radar apparatus includes a transmission signal generator that generates a first transmission signal obtained by modifying a code having a third sub-code sequence and a fourth sub-code sequence coupled to each other in a first transmission period, and generates a second transmission period obtained by modifying a code having a fifth sub-code sequence and a sixth sub-code sequence coupled to each other in a second transmission period, and a transmitter RF unit that converts the first and second transmission signals into radio frequency transmission signals, and transmits the radio frequency transmission signals from the transmitter antenna. | 05-16-2013 |
20130127655 | RADAR DEVICE - A radar receiver has plural antenna system processors each for performing coherent integration on the basis of correlation values between a reception signal and a transmission signal using correction amounts for phase variations corresponding to plural Doppler frequencies, plural correlation matrix generators for generating, for each of the plural different Doppler frequencies, correlation matrices which are pieces of phase difference information relating to an arrangement of reception antennas on the basis of sets of outputs of the coherent integration, respectively, an adder for adding together outputs of the plural correlation matrix generators, and an incoming direction estimator for estimating an incoming direction of reflection waves on the basis of outputs of the adder. | 05-23-2013 |
20130135140 | RADAR DEVICE - A high-frequency transmission signal is transmitted from a transmission antenna with a predetermined transmission period, and a signal of a reflected wave reflected from a target is received by a reception antenna. A code generator generates a first code sequence and second code sequence that constitute a pair of complementary codes. A first modulator modulates the first code sequence to generate a first transmission signal. A second modulator modulates the second code sequence to generate a second transmission signal. A quadrature modulator performs quadrature modulation by using the generated first and second transmission signals. The high-frequency transmission signal is generated from a signal that is quadrature modulated, and transmitted from the transmission antenna. | 05-30-2013 |
20130147655 | RADAR APPARATUS - A radar apparatus transmits a high-frequency transmission signal, and receives a signal of a reflective wave reflected by a target. Given a first code sequence of a first code length, a second code sequence of a second code length which is longer than the first code sequence, and a third code sequence obtained by inverting each code of the first code sequence, a first transmission signal obtained by modulating the first code sequence, a second transmission signal obtained by modulating the second code sequence, a third transmission signal obtained by modulating the third code sequence and a fourth transmission signal obtained by modulating the second code sequence are generated in a first transmission period, a second transmission period, a third transmission period and a fourth transmission period respectively. | 06-13-2013 |
20130162465 | RADAR DEVICE - A radar device includes a signal generator that generates an intermittent signal having a prescribed signal width and signal interval, a transmission signal position adjuster that outputs a transmission signal while adjusting positions of the intermittent signal on the time axis, an RF transmitter that transmits the transmission signal, an RF receiver that receives a reception signal including reflection waves reflected from an object in a measurement subject space, an AD converter that converts the reception signal into a digital signal, and an object detector that detects the object based on the reception signal. The transmission signal position adjuster outputs a transmission signal in which positions of respective signal units of the intermittent signal on the time axis are adjusted in units of a time adjustment amount that is shorter than a sampling interval of the AD converter. | 06-27-2013 |
20130176166 | RADAR DEVICE - A first sector radar generates signals which are obtained by modulating a first code sequence at a first transmission cycle, obtained by modulating a second code sequence at a second transmission cycle, obtained by modulating the first code sequence at a third transmission cycle, and obtained by modulating the second code sequence at a fourth transmission cycle respectively. A second sector radar generates signals which are obtained by modulating the second code sequence at the first transmission cycle, obtained by modulating, at the second transmission cycle, a third code sequence having the opposite polarity to the first code sequence, obtained by modulating, at the third transmission cycle, a fourth code sequence having the opposite polarity to the second code sequence, and obtained by modulating the first code sequence at the fourth transmission cycle respectively. | 07-11-2013 |
20130229297 | RADAR APPARATUS - A pulse signal is produced in a pulse generating section, and repetitively transmitted from an antenna at constant time intervals. A reception signal, received through an antenna and including a reflective wave from an object, is amplified and gain-adjusted. Thereafter, a distance detecting section detects a reception pulse of the reflected wave, and calculates the distance to the object. The variable attenuator attenuates the reception signal by a gain adjusted in accordance with a gain control signal. The gain of the variable attenuator is controlled so as to be maximum immediately after the pulse signal is transmitted, and to be reduced with elapse of time. Based on a gain adjustment timing signal, a gain adjustment timing when the attenuation amount is changed is made different for each transmission of the pulse signal. | 09-05-2013 |
20130241766 | RADAR DEVICE - Under control of a first transmission code controlling section, a first radar transmitting section periodically transmits a first radar transmission signal with a first transmission period based on a first transmission trigger signal produced after elapse of a first delay time period from reception of a predetermined synchronization establishment signal by a first transmission trigger signal producing section. Under control of a second transmission code controlling section, a second radar transmitting section periodically transmits a second radar transmission signal with a second transmission period similarly. In accordance with the first delay time period and the second delay time period, arrival times of interference signals from the first radar transmitting section and the second radar transmitting section are within transmission zones of the second radar transmission signal and the first radar transmission signal. | 09-19-2013 |
20140064264 | WIRELESS COMMUNICATION DEVICE - A WiGig wireless device partially performs a masking processing on a preamble of a transmission signal frame and generates a repetition pattern of the same pulse capable of being used in a correlation detection of a sensor. That is, a repetition pattern of a Golay code is output by intermittently performing the masking processing on the Golay code sequence. The sensor performs the correlation detection using a pulse compression technology, thereby detecting the antenna radiation pattern even in an environment where a reflected wave is generated, by separating the direct wave and the reflected wave. | 03-06-2014 |
20140085128 | RADAR DEVICE - A first radar transmitter and a second radar transmitter transmit a first modulation signal and a second modulation signal which are generated by repeating a predetermined time of code sequences, each of which has a predetermined code length, using a first code width and a second code width, respectively. An A/D converter converts the modulation signal into a discrete signal in a sampling cycle shorter than a difference between the first code width and the second code width. A positioning section separates a plurality of reception signals using a first correlation value based on outputs from the A/D converter and a first delay section corresponding to the first code width and a second correlation value based on outputs from the A/D converter and a second delay section corresponding to the second code width. | 03-27-2014 |
20140111367 | RADAR APPARATUS - A pulse transmission controller generates transmission timing signals for a high-frequency radar transmission signal in every transmission cycle. A transmission phase shifter gives a transmission signal generated by a modulator phase shifts each corresponding to a transmission cycle on the basis of the transmission timing signals generated at intervals that are equal to the transmission cycle. A reception phase shifter gives a reception signal that is output from an A/D converter reception phase shifts that are opposite in direction to the respective transmission phase shifts given by the transmission phase shifter on the basis of the transmission timing signals generated at intervals that are equal to the transmission cycle. | 04-24-2014 |
20140192923 | PHASED ARRAY TRANSMISSION DEVICE - Transmission outputs of a plurality of transmission branches ( | 07-10-2014 |