Abstract: A dot impact printing head for a printing apparatus that performs printing on a medium by repeating transport of the medium in a sub-scanning direction and movement of the dot impact printing head in a main scanning direction that intersects the sub-scanning direction, the dot impact printing head including at least one wire pin row formed as a result of a plurality of wire pins being arranged at a fixed pitch in the sub-scanning direction, in which all of the wire pins that configure the wire pin row are disposed shifted in three or more different positions in the main scanning direction within a range of the same dimension as the pitch.

Abstract: A base station has a first wireless communication unit that communicates with mobile stations for offering a first radio communication service to the mobile stations, and a second wireless communication unit that communicates with mobile stations for offering a second radio communication service that is different from the first radio communication service to the mobile stations. At the base station, a communication service continuation restrictor is provided that restricts operation of the base station as to whether or not, when it is detected that either one of the first or the second radio communication service is not executable, another radio communication service should be continued. Whether or not the other communication service should be continued can be set at the communication service continuation restrictor.

Abstract: A base station in a mobile communication system transmits and receives wireless signals with a user apparatus in a cell; in the case where the base station is connected to a communication network through a router, obtains an address of the router; periodically receives time information from a time information server through the communication network; stores in a memory unit the router's address and a current time indicated by the time information; and (1) in the case where a current-time-storing-is-stopped period is equal to or greater than a threshold value, or (2) in the case where the current-time-storing-is-stopped period is less than the threshold value and is equal to or greater than another threshold value, and an address just received from the router is different from the address stored in the memory unit, transmits a control signal for stopping the transmission of the wireless signal.

Abstract: A recording head control method prevents head coil burnout caused by heat output while suppressing a drop in printer throughput. A control method for a recording head 18 of a dot impact printer 100 that prints information on a recording medium S by driving the recording wires 9 of a recording head 18 that has a plurality of recording wires 9 while a carriage 19 that carries the recording head 18 traverses the recording medium S, each of the recording wires 9 being allocated to printing one dot line in the scanning direction of the carriage 19, the control method including steps of: during dot line printing, determining before printing if the number of previously defined specific dot patterns P1, P2 contained in the dot line to be printed is greater than or equal to a reference number N of 2 or more; and printing the dot line based on the result of the decision.

Abstract: A base station has a first wireless communication unit that communicates with mobile stations for offering a first radio communication service to the mobile stations, and a second wireless communication unit that communicates with mobile stations for offering a second radio communication service that is different from the first radio communication service to the mobile stations. At the base station, a communication service continuation restrictor is provided that restricts operation of the base station as to whether or not, when it is detected that either one of the first or the second radio communication service is not executable, another radio communication service should be continued. Whether or not the other communication service should be continued can be set at the communication service continuation restrictor.

Abstract: A base station in a mobile communication system transmits and receives wireless signals with a user apparatus in a cell; in the case where the base station is connected to a communication network through a router, obtains an address of the router; periodically receives time information from a time information server through the communication network; stores in a memory unit the router's address and a current time indicated by the time information; and (1) in the case where a current-time-storing-is-stopped period is equal to or greater than a threshold value, or (2) in the case where the current-time-storing-is-stopped period is less than the threshold value and is equal to or greater than another threshold value, and an address just received from the router is different from the address stored in the memory unit, transmits a control signal for stopping the transmission of the wireless signal.

Abstract: In a radio communication system (1), a lower-level station (10a) has: a lower-level station ID detection unit (13) which detects a lower-level station ID for identifying another lower-level station (10b), from a signal from the other lower-level station (10b); a group ID detection unit (12) which identifies a group ID for identifying a group to which the other lower-level station (10b) belongs; a measurement unit (15) which measures a channel utilization state of the other lower-level station (10b); a utilization probability update unit (19) which calculates a channel utilization amount for each lower-level station and a channel utilization amount for each group based on the lower-level station ID, group ID and channel utilization state, and updates a channel utilization probability which indicates the utilization probability of communication channels based on the channel utilization amount for each lower-level station and the channel utilization amount for each group; and a channel determination unit (20) wh

Abstract: A receiver that receives a signal from a transmitter, including: a plurality of antennas; a channel estimation unit; a channel accumulation unit; a transmission weight generator; a feedback information transmission unit; and a reception weight generator. The plurality of antennas receive a second signal from the transmitter, the second signal being transmitted by using first feedback information. The channel estimation unit estimates a communication channel state on the basis of the second signal, and then outputs second channel estimation information. The reception weight generator generates reception weight information to be multiplied by the second signal, on the basis of first channel estimation information accumulated in the channel accumulation unit and a first transmission weight.

Abstract: A recording head control method prevents head coil burnout caused by heat output while suppressing a drop in printer throughput. A control method for a recording head 18 of a dot impact printer 100 that prints information on a recording medium S by driving the recording wires 9 of a recording head 18 that has a plurality of recording wires 9 while a carriage 19 that carries the recording head 18 traverses the recording medium S, each of the recording wires 9 being allocated to printing one dot line in the scanning direction of the carriage 19, the control method including steps of: during dot line printing, determining before printing if the number of previously defined specific dot patterns P1, P2 contained in the dot line to be printed is greater than or equal to a reference number N of 2 or more; and printing the dot line based on the result of the decision.

Abstract: In a lower-level station (1), as a configuration to determine a channel utilization probability, which is a probability based on which the relevant lower-level station (1) determines whether a channel determination operation is stared or not, a correction unit (16B) is newly provided, which corrects the channel utilization probability based on not only information on a number of lower-level stations which have performed communication during a predetermined period and channel utilization state recording information which indicates the channel utilization state of the lower-level stations which have performed the communication, but also information on all the communication channels that can be utilized, that is, information on channel capacity that can be utilized in the entire system.

Abstract: A receiver that receives a signal from a transmitter, including: a plurality of antennas; a channel estimation unit; a channel accumulation unit; a transmission weight generator; a feedback information transmission unit; and a reception weight generator. The plurality of antennas receive a second signal from the transmitter, the second signal being transmitted by using first feedback information. The channel estimation unit estimates a communication channel state on the basis of the second signal, and then outputs second channel estimation information. The reception weight generator generates reception weight information to be multiplied by the second signal, on the basis of first channel estimation information accumulated in the channel accumulation unit and a first transmission weight.

Abstract: A radio communication system includes: a first acquisition unit configured to acquire future prediction information on each of the plurality of lower nodes; a second acquisition unit configured to acquire latest prediction information on a communication starting station that is a lower node starting the radio communications among the plurality of lower nodes; a third acquisition unit configured to acquire channel use information on each of the plurality of lower nodes; a calculation unit configured to calculate a radio channel use probability for each of the plurality of radio channels on the basis of both the future prediction information acquired by the first acquisition unit and the channel use information acquired by the third acquisition unit; and a determination unit configured to determine one radio channel among the plurality of radio channels on the basis of the radio channel use probabilities calculated by the calculation unit, the one radio channel being to be assigned to the communication starting

Abstract: A radio communication apparatus for performing transmission and reception based on radio communication includes: a power suppressor for coupling loop interference signal for attenuating signal power of a received signal to suppress the coupling loop interference signal power of the received signal; and a transceiver having a coupling loop interference signal removal function for analog domain and/or a coupling loop interference signal removal function for digital domain, for removing a coupling loop interference signal contained in a signal output from the power suppressor for coupling loop interference signal.

Abstract: This invention provides an MIMO communication system and MIMO communication method. An MIMO receiver estimates state of each communication channel from the received signals received by #1 to #L antennas, generates feedback information according to the information of channel state, sends the feedback information to a transmitter through a feedback path, processes the feedback information in order to compensate feedback-delay of the feedback path, generate K*L proper reception weights by using the information of channel state and processed feedback information, multiplies the received #1 to #L substreams of respective #1 to #K signal streams by the proper #1 to #L reception weights, respectively, composes the #1 to #L weighted substreams to obtain respective composed #1 to #K signal streams and demodulate the composed #1 to #K signal streams, respectively, and combines the demodulated K signal streams to reproduce an original transmission signal.

Abstract: In a radio communication system (1), a lower-level station (10a) has: a lower-level station ID detection unit (13) which detects a lower-level station ID for identifying another lower-level station (10b), from a signal from the other lower-level station (10b); a group ID detection unit (12) which identifies a group ID for identifying a group to which the other lower-level station (10b) belongs; a measurement unit (15) which measures a channel utilization state of the other lower-level station (10b); a utilization probability update unit (19) which calculates a channel utilization amount for each lower-level station and a channel utilization amount for each group based on the lower-level station ID, group ID and channel utilization state, and updates a channel utilization probability which indicates the utilization probability of communication channels based on the channel utilization amount for each lower-level station and the channel utilization amount for each group; and a channel determination unit (20) wh

Abstract: In a lower-level station (1), as a configuration to determine a channel utilization probability, which is a probability based on which the relevant lower-level station (1) determines whether a channel determination operation is stared or not, a correction unit (16B) is newly provided, which corrects the channel utilization probability based on not only information on a number of lower-level stations which have performed communication during a predetermined period and channel utilization state recording information which indicates the channel utilization state of the lower-level stations which have performed the communication, but also information on all the communication channels that can be utilized, that is, information on channel capacity that can be utilized in the entire system.

Abstract: A calculation server estimates a position of a mobile terminal that communicates with a base station incorporated with received global positioning system satellite signals. The calculation server includes a positioning information analyzer configured to select one of the positioning modes to be used out of a cell/sector positioning mode and a hybrid positioning mode on the basis of a distance between a cellular base station and the mobile terminal, and a position detector configured to calculate the position of the mobile terminal in the positioning mode selected by the positioning information analyzer.

Abstract: Symbols converted by a serial-to-parallel converting part (12) from serial to parallel form are subjected to inverse Fourier transform processing in an inverse Fourier transform part (13) as sub-carrier signal components of a frequency interval equal to the symbol rate, then the levels of the resulting time domain signal components are compared with a permissible peak level Cth in a peak component detecting part (22) to detect peak components, and the peak components are transformed by a Fourier transform part (23) to frequency domain components, which are subtracted by subtractors (240 to 24N?1) from the corresponding sub-carrier signal components to thereby reduce the peak power.

Abstract: An object of the present invention is to provide a communications system etc., which can reduce the influence of interference from other systems which results from a difference in symbol length, in an area where a plurality of systems using different transmission methods are mixed. The present invention relates to a communications system in which a plurality of systems share the same frequency bandwidth so as to transmit information symbols. One of the plurality of systems 1 includes an identifying unit 109 configured to identify the symbol length of an information symbol transmitted in a different system 2; and an adjusting unit 102, 107 configured to adjust the symbol length of an information symbol to be transmitted, in accordance with an identified symbol length.

Abstract: An OFDM signal frame generator includes a rate determiner configured to determine rate information to generate a signal frame to be transmitted as an OFDM signal based on a value of a received signal quality. The signal frame generator further includes a pilot and data arrangement format determiner configured to determine a pilot and data arrangement format of the signal that is to be transmitted; power amplification rate determiner configured to determine a power amplification rate for the signal frame; data symbol generator configured to generate data symbol series to be transmitted based on the rate information and based on the power amplification rate; and transmission signal frame generator configured to generate the signal frame based on the generated data symbol series, on the number of pilot symbols, and based on the pilot & data arrangement format.