Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Koji Imamura

Naganori Shirakata

Kenji Miyanaga

Shuya Hosokawa

Koichiro Tanaka

Takayuki Abe

Masahiro Kumagawa

Yoshio Urabe

Tsutomu Mukai

Shinichi Okada

Shinsuke Ogata

Motoo Nakagawa

Shigeki Nakamura

Masahiro Nakano

Hironori Nakae

Atsushi Maruyama

Hiroshi Hayashino

Yoshitaka Ohta

Suguru Kojima

Junichi Takahashi

Kazutoshi Satou

Kazuhiko Yahata

A reading system includes an evaluation value acquirer and a determining processor. The evaluation value acquirer is configured to acquire, with regard to a reading device configured to perform wireless communication with an electronic tag attached to each of one or more items by using a radio wave as a medium to read item information on each of one or more items, an evaluation value about at least one of: the number of times; a time interval; or a frequency, of reading the item information for each of at the one or more items. The determining processor is configured to determine, for each of the one or more items, whether or not each of the one or more items is an object to be read based on a change in the evaluation value over time.

Reading system, shopping assistance system, reading method, and program

A wireless reading system includes a goods path and a reader device. The goods path allows one or more goods held by a customer passing through a customer path to be moved along. The reader device is configured to perform wireless communication, whose medium is radio waves, with one or more electronic tags attached to the one or more goods while the one or more goods are moved along the goods path, thereby reading one or more pieces of goods information on the one or more goods, respectively.

Wireless reading system, shopping assistance system with the same, wireless reading method and shopping assistance method

A wireless communications system according to an aspect includes a communications terminal, a detection unit, and a control unit. The communications terminal includes a communications unit to communicate wirelessly with a communications partner terminal. The detection unit detects movement of the communications terminal. The control unit controls the communications terminal so as to vary a communicable area of the communications unit. The communicable area is defined relatively to the communications terminal. The control unit varies the communicable area according to at least magnitude of the movement detected by the detection unit.

Wireless communications system and method for controlling communications terminal

Provided is a transmission apparatus capable of reducing power consumption of a reception apparatus. The transmission apparatus includes a modulator that modulates a data signal to generate a transmission signal. The modulator modulates the data signal by assigning the data signal to a frequency difference between a first frequency and a second frequency in a carrier.

Transmission apparatus, reception apparatus, communication system, transmission method, and reception method

A wireless communication apparatus in a first wireless communication system is equipped with a power detector for detecting power of a reception signal; an envelope detector for detecting an envelope signal of the reception signal; a signal determiner for determining whether the reception signal is a first signal to be used for a communication in the first wireless communication system, on the basis of a variation amount of the envelope signal; a wireless communicator for performing a wireless communication; and a wireless communication activator for activating the wireless communicator when the wireless communication apparatus detects power of the reception signal and determines that the reception signal is the first signal.

Wireless communication apparatus and wireless communication method

A wireless receiver capable of realizing both reduction of electricity consumption and stable activation is provided. The wireless receiver includes: a power detector which detects power of a received signal; a first pattern detector which detects a predetermined signal pattern included in the received signal; a wireless communicator which performs wireless communication; a pattern detection activator which activates the first pattern detector when the power detector detects the power of the received signal; and a wireless communication activator which activates the wireless communicator when the first pattern detector detects the predetermined signal pattern in the received signal.

Wireless receiver and wireless receiving method

Two LPFs are disposed on the output side of a differential amplifier to remove an AC component contained in an output signal output from a first output terminal of the differential amplifier and an AC component contained in an output signal output from a second output terminal of the differential amplifier. The lowpass filter voltage of the output signal output from the first output terminal with the AC component removed is input to one of input terminals of one of two comparators, and the lowpass filter voltage of the output signal output from the second output terminal with the AC component removed is input to one of input terminals of the other comparator.

DC offset canceller

An AGC unit starts a gain control of the variable gain amplifying unit when a bit saturation occurs in the digital baseband signal output from the A/D converting unit, and starts a gain control of the variable gain amplifying unit when a detection of STS from the digital baseband signal output from the A/D converting unit is started. The AGC unit performs the gain control of the variable gain amplifying unit once when the detection of STS is started, and performs the gain control of the variable gain amplifying unit twice when the bit saturation occurs, namely a larger number of times than when the detection of STS is started.

Receiving device and receiving method

The communication device () which performs, when attached to the first region of the moving body, wireless communication with the communication partner device () attached to the second region of the moving body includes: a motion obtaining unit () which obtains motion information indicating a motion of at least one region of the moving body; a parameter determining unit () which determines a parameter corresponding to the motion of the region of the moving body indicated by the motion information obtained by the motion obtaining unit (), using parameter information in which the motion and a parameter indicating a communication mode for successful wireless communication are associated with each other; and a wireless communication unit () which performs wireless communication with the communication partner device () according to the parameter determined by the parameter determining unit ().

Communication device and communication method

Provided is a compact and low power consumption wireless communication system, including a base station and communication terminals, in which power consumption of the communication terminal is reduced. The base station alternately sets an active interval during which predetermined data communication is performed, and an inactive interval during which the predetermined data communication is not performed. During the active interval, a beacon including information indicating a start timing of a subsequent active interval is transmitted and received. During the inactive interval, a sub-beacon including information providing notice of a transmission timing of a subsequent beacon is transmitted and received. When receiving the sub-beacon, the communication terminal obtains the transmission timing of the subsequent beacon and stops a supply of power to an unit related to a wireless communication function until the transmission timing.

Wireless communication apparatus, terminal, system, program

In a wireless communication system according to the present invention: a control device and a communication terminal communicate in an active period. The control device: generates a first beacon packet including one or more candidate channels; transmits the first beacon packet at the beginning of the active period; determines whether or not a use channel is to be changed based on a communication state, and generates a second beacon packet including information of a determination result; transmits the second beacon packet at the end of the active period; and, when it is determined that the use channel is to be changed, changes the use channel after the active period ends and before a next active period starts. The communication terminal: receives the first and second beacon packets; and, based on the second beacon packet, changes the use channel after the active period ends and before a next active period starts.

Control device, communication terminal, control method, and communication method

The noise amount information storage unitstores noise amount information which indicates relationships between gain value of the variable gain amplification unitsandand the amount of noise included in BB signals output from the down convertersand. The AGC unitcontrols the gain value of the variable gain amplification unitsandso that the power of BB signals output from the down convertersandbecomes constant. The noise amount estimation unitestimates noise amount of noise corresponding to the controlled gain value of the variable gain amplification unitsandby referring to the noise amount information stored in the noise amount information storage unit. The weight generation unitgenerates weight matrix based on results of estimations performed by the channel characteristic estimation unitand the noise estimation unit

Reception device and reception method

An FFT unit () separates a received symbol by Fourier conversion into a plurality of subcarriers, and a phase difference detection unit () detects a phase difference between 4 pilot carriers and data carriers adjacent to the pilot carriers (adjacent carriers) The decision unit () decides whether the phase differences between the pilot carriers and the adjacent carriers detected by the phase difference detection unit () fulfill a phase difference condition. Then, the decision unit () decides that the received symbol is an HTSIG if the number of phase differences that fulfill the phase difference condition is greater than or equal to a predetermined number, and decides that the received symbol is either a SIG or a DATA if the number of phase differences that fulfill the phase difference condition is less than the predetermined number.

Signal judgment apparatus and signal judgment method

At a time T, a wireless communication apparatusA determines to transmit a data packet, and then performs interference signal detection for a period TA. At a time T, which precedes a time Tat which the period TA has elapsed since the time T, the wireless communication apparatusA detects a data packet d(an interference signal). At a time T, at which a period TB has elapsed since the time Tat which the interference signal has been detected, the wireless communication apparatusA starts transmitting a data packet dto a wireless communication apparatusA. At a time T, the wireless communication apparatusA completes the transmission of the data packet d

Transmitting device, wireless communication system and transmitting method

Interfering signals coming at random timings from different radio stations are identified. In order to attain this, a method for storing the characterizing quantity of an interfering signal included in a received signal includes calculating the characterizing quantity of the received signal, determining a probability that a desired signal is included in the received signal, determining that the received signal is an interfering signal when determining that there is no probability that the desired signal is included in the received signal, and storing the characterizing quantity of the received signal as an interfering signal characterizing quantity when it is determined at the received signal determination step that there is no probability that the desired signal is included in the received signal.

Interfering signal characterizing quantity storing method and device, interfering signal characterizing quantity acquiring method and device, and interfering signal suppressing method and device

Growing community of inventors

Osaka, Japan

Koji Imamura