Abstract: When a main body case is viewed from below, an antenna is within a rectangular/square area defined by first to fourth points. An opening edge of a first opening includes: a first edge linearly along a first direction; and a second edge linearly along a second direction perpendicular to first direction, first point is defined as an intersection of a first straight line and a second straight line, first straight line includes first edge, and second straight line includes second edge. Second point is defined as a point apart from first point in first direction by a distance that is half prescribed wavelength. Third point is defined as a point apart from second point in second direction by a distance that is half prescribed wavelength. Fourth point is defined as a point apart from first point in second direction by a distance that is half prescribed wavelength.

Abstract: A ventilation device includes a main body case made of metal, a fan, a wireless communications unit, and a controller. Controller is configured to control fan in accordance with a signal received by the wireless communications unit. Main body case includes a suction section and an exhaust section. Suction section has a box shape, and includes a suction port. Suction section has a lower surface, an upper surface, and a front surface connecting a front edge of lower surface and a front edge of upper surface. Exhaust section is positioned on upper surface of suction section and includes exhaust port. Suction section includes a first opening and a second opening. First opening is in upper surface, and overlapped with at least part of wireless communications unit in upward-downward directions. Second opening is in front surface, and overlapped with at least part of wireless communications unit in forward-backward directions.

Abstract: A wireless communication device has an aim of specifying, when transmitting data to another communication device, an antenna among antennas that can transmit data at a low transmission power. The wireless communication device switches between a first antenna and a second antenna upon transmission of a request signal to the other communication device, and increases or decreases transmission power for transmitting the request signal when switching between the first antenna and the second antenna.

Abstract: A receiver includes a first detector that detects a Received Signal Strength Indicator of a desiring signal wave transmitted from a transmitter, a second detector that detects a power of interfering wave generated by an external device, a transmission rate selection processor that selects a transmission rate, which is used to transmit a signal from the transmitter to the receiver, from among a plurality of transmission rates based on the detected Received Signal Strength Indicator of the desiring signal wave and a detected power of the interfering wave, when the second detector detects generation of the interfering wave, and a transmission rate notificator that notifies the transmitter of the transmission rate selected by the transmission rate selection processor.

Abstract: A wireless communication device has an aim of specifying, when transmitting data to another communication device, an antenna among antennas that can transmit data at a low transmission power. The wireless communication device switches between a first antenna and a second antenna upon transmission of a request signal to the other communication device, and increases or decreases transmission power for transmitting the request signal when switching between the first antenna and the second antenna.

Abstract: A communication device includes: an antenna unit through which electric waves are transmitted and received; a scatterer which reflects the electric waves; a communication unit configured to wirelessly communicate with a first communication partner device via the antenna unit; and a scatterer control unit configured to change a state of the scatterer when communication fails between the communication unit and the first communication partner device.

Abstract: A communication device includes: a first antenna and a second antenna; a switch unit selecting the first antenna in a first term and the second antenna in a second term; a reception determination unit determining whether or not communication data contained in wireless signals received by the first antenna and the second antenna; and a storage unit storing association between each of communication terminals and one of the first antenna and the second antenna, in which the switch unit sets lengths of the first and second terms so that a ratio of the respective lengths of the first and second terms is equal to a ratio of the number of times the communication data from the communication terminals respectively associated with the first and second antennas and is determined to be successfully obtained.

Abstract: A communication apparatus which communicates data with plural other communication apparatuses by performing wireless communication includes: plural antennas; a communication level obtainment unit which obtains communication levels for the antennas obtained when the communication apparatus performed the wireless communication with the other communication apparatuses; a count unit which counts, for each of the antennas, the number of established communications that is the number of one or more of the other communication apparatuses which successfully established communication through the antenna; an antenna selection unit which selects, when the total number of antennas whose numbers of established communications are greatest is more than one, one of the antennas corresponding to a communication level that is highest among communication levels of plural antennas of the other communication apparatus corresponding to the lowest communication level; and a transmission unit which broadcasts predetermined data to th

Abstract: A receiver includes a first detector that detects a Received Signal Strength Indicator of a desiring signal wave transmitted from a transmitter, a second detector that detects a power of interfering wave generated by an external device, a transmission rate selection processor that selects a transmission rate, which is used to transmit a signal from the transmitter to the receiver, from among a plurality of transmission rates based on the detected Received Signal Strength Indicator of the desiring signal wave and a detected power of the interfering wave, when the second detector detects generation of the interfering wave, and a transmission rate notificator that notifies the transmitter of the transmission rate selected by the transmission rate selection processor.

Abstract: Provided is an antenna including a planar conductor to be grounded, and a three-dimensional linear conductor having at least a linear conductor, another linear conductor, and still another linear conductor that are integrally formed. The linear conductor is provided perpendicularly to the major surface of the planar conductor. The another linear conductor is parallel to the major surface. Still another linear conductor is parallel to the major surface, and is provided perpendicularly to the another linear conductor.

Abstract: A communication apparatus which communicates data with plural other communication apparatuses by performing wireless communication includes: plural antennas; a communication level obtainment unit which obtains communication levels for the antennas obtained when the communication apparatus performed the wireless communication with the other communication apparatuses; a count unit which counts, for each of the antennas, the number of established communications that is the number of one or more of the other communication apparatuses which successfully established communication through the antenna; an antenna selection unit which selects, when the total number of antennas whose numbers of established communications are greatest is more than one, one of the antennas corresponding to a communication level that is highest among communication levels of plural antennas of the other communication apparatus corresponding to the lowest communication level; and a transmission unit which broadcasts predetermined data to th

Abstract: A communication device includes: a first antenna and a second antenna; a switch unit selecting the first antenna in a first term and the second antenna in a second term; a reception determination unit determining whether or not communication data contained in wireless signals received by the first antenna and the second antenna; and a storage unit storing association between each of communication terminals and one of the first antenna and the second antenna, in which the switch unit sets lengths of the first and second terms so that a ratio of the respective lengths of the first and second terms is equal to a ratio of the number of times the communication data from the communication terminals respectively associated with the first and second antennas and is determined to be successfully obtained.

Abstract: A base station includes: an estimation section estimating transmission condition of each of frequency channels used for communication; a reception section receiving a data signal from each communication terminal through any of the frequency channels; a measurement section measuring received signal power of the received data signal for each frequency channel; a determination section determining, for each frequency channel, whether the received data signal is demodulated errorlessly; and a control section assigning frequency channels estimated as being in good transmission condition by the estimation section, to communication terminals the data signals of which are determined as not being errorlessly demodulated by the determination section, such that a frequency channel in a better transmission condition is assigned preferentially to a communication terminal having larger received signal power detected by the detection section, and transmitting retransmission request signals requesting the communication termin

Abstract: A communication device includes: an antenna unit through which electric waves are transmitted and received; a scatterer which reflects the electric waves; a communication unit configured to wirelessly communicate with a first communication partner device via the antenna unit; and a scatterer control unit configured to change a state of the scatterer when communication fails between the communication unit and the first communication partner device.

Abstract: In a receiver, a channel estimation unit estimates channel characteristics of each channel, and a weight generation unit generates a weight matrix used in equalization processing by an equalizer in accordance with the estimated values of channel characteristics for each channel as estimated by the channel estimation unit. Furthermore, a likelihood calculation unit calculates a likelihood indicating a degree of certainty for each transmission stream using the weight matrix generated by the weight generation unit, and an adaptive control unit determines a transmission rate appropriate for transmission of a signal from a transmitter to the receiver in accordance with the likelihood of each transmission stream calculated by the likelihood calculation unit, notifying the transmitter of the determined transmission rate.

Abstract: Provided is an antenna including a planar conductor to be grounded, and a three-dimensional linear conductor having at least a linear conductor, another linear conductor, and still another linear conductor that are integrally formed. The linear conductor is provided perpendicularly to the major surface of the planar conductor. The another linear conductor is parallel to the major surface. Still another linear conductor is parallel to the major surface, and is provided perpendicularly to the another linear conductor.

Abstract: A transmitting device of the present invention comprises an encoder (20), a transmitting unit (100) including a pulse generator (30) and a parallel-to-serial converter (50), a transmitting control unit (40), and an antenna (90). The pulse generator (30) comprises a first pulse train generator (31), a second pulse train generator (32), . . . and an n-th pulse train generator (33). A k-bit information bit train is inputted from the information signal source (10), The encoder (20) encodes the k-bit information bit train into an n-bit encoded bit train at a coded rate of (k/n). The pulse generator (30) generates n-piece repetitive pulse trains corresponding to the n-bit encoded bit train. The antenna (90) transmits the n-piece repetitive pulse trains as UWB-IR.

Abstract: A base station includes: an estimation section estimating transmission condition of each of frequency channels used for communication; a reception section receiving a data signal from each communication terminal through any of the frequency channels; a measurement section measuring received signal power of the received data signal for each frequency channel; a determination section determining, for each frequency channel, whether the received data signal is demodulated errorlessly; and a control section assigning frequency channels estimated as being in good transmission condition by the estimation section, to communication terminals the data signals of which are determined as not being errorlessly demodulated by the determination section, such that a frequency channel in a better transmission condition is assigned preferentially to a communication terminal having larger received signal power detected by the detection section, and transmitting retransmission request signals requesting the communication termin

Abstract: In a receiver 20, a channel estimation unit 203 estimates channel characteristics of each channel, and a weight generation unit 204 generates a weight matrix used in equalization processing by an equalizer 206 in accordance with the estimated values of channel characteristics for each channel as estimated by the channel estimation unit 203. Furthermore, a likelihood calculation unit 205 calculates a likelihood indicating a degree of certainty for each transmission stream using the weight matrix generated by the weight generation unit 204, and an adaptive control unit 211 determines a transmission rate appropriate for transmission of a signal from a transmitter to the receiver 20 in accordance with the likelihood of each transmission stream calculated by the likelihood calculation unit 205, notifying the transmitter of the determined transmission rate.

Abstract: A transmitting device of the present invention comprises an encoder (20), a transmitting unit (100) including and a pulse generator (30) and a parallel-to-serial converter (50), a transmitting control unit (40), and an a antenna (90) The pulse generator (30) comprises a first pulse train generator (31), a second pulse train generator (32), and an n-th pulse train generator (33) A k-bit information bit train is inputted from the information signal source (10) The encoder (20) encodes the k-bit information bit train into an n-bit encoded bit train at a coded rate of (k/n) The pulse generator (30) generates n-piece repetitive pulse trains corresponding to the n-bit encoded bit train The antenna (90) transmits the n-piece repetitive pulse trains as UWB-IR.