Abstract: A non-transitory computer-readable recording medium stores therein a program that causes a computer to execute a process including collecting packets related to streaming data delivered from a transmission source to a transmission destination, calculating a packet statistical value of a predetermined time period based on the collected packets, and creating, based on the calculated packet statistical value, an estimation model for estimating streaming quality using, as an input, a time series of packet statistical values corresponding to a time length exceeding a buffer time of the streaming data at the transmission destination.

Abstract: An information processing apparatus includes a memory, and a processor coupled to the memory and configured to obtain location information indicating locations of a wireless transmitter and a wireless receiver, simulate a first power of a first reception signal at the wireless receiver in a condition that a radio signal is transmitted from the wireless transmitter, identify a first probability distribution model in accordance with the first reception signal, identify a first parameter of the first probability distribution model in accordance with the first power and a propagation environment defined by the locations of the wireless transmitter and the wireless receiver indicated by the location information, and based on the first probability distribution model using the first parameter, simulate a second power of a second reception signal at around the wireless receiver.

Abstract: An information processing apparatus includes a memory, and a processor coupled to the memory and configured to obtain location information indicating locations of a wireless transmitter and a wireless receiver, simulate a first power of a first reception signal at the wireless receiver in a condition that a radio signal is transmitted from the wireless transmitter, identify a first probability distribution model in accordance with the first reception signal, identify a first parameter of the first probability distribution model in accordance with the first power and a propagation environment defined by the locations of the wireless transmitter and the wireless receiver indicated by the location information, and based on the first probability distribution model using the first parameter, simulate a second power of a second reception signal at around the wireless receiver.

Abstract: A method includes: receiving beacon signals transmitted by each of a plurality of beacon devices around a positioning target terminal; first calculating, based on the received beacon signals, location information indicating locations of a plurality of mobile beacon devices included in the plurality of beacon devices; selecting a plurality of second mobile beacon devices from among the plurality of mobile beacon devices by excluding one or more first mobile beacon devices having similar azimuth directions from the positioning target terminal among the plurality of mobile beacon devices based on the calculated location information; and second calculating by circuitry, based on the selected plurality of second mobile beacon devices, a location of the positioning target terminal.

Abstract: The mobile unit position detecting apparatus generates target data by extracting a target from an image shot by the image capturing device, extracts target setting data that best matches the target data, is prerecorded in a recording unit and is shot for each target, obtains a target ID corresponding to the extracted target setting data from the recording unit, detects position data associated with the obtained target ID, tracks the target in the image shot by the image capturing device, and calculates an aspect ratio of the target being tracked in the image. If the aspect ratio is equal to or lower than a threshold value, the mobile unit position detecting apparatus outputs the detected position data.

Abstract: The mobile unit position detecting apparatus generates target data by extracting a target from an image shot by the image capturing device, extracts target setting data that best matches the target data, is prerecorded in a recording unit and is shot for each target, obtains a target ID corresponding to the extracted target setting data from the recording unit, detects position data associated with the obtained target ID, tracks the target in the image shot by the image capturing device, and calculates an aspect ratio of the target being tracked in the image. If the aspect ratio is equal to or lower than a threshold value, the mobile unit position detecting apparatus outputs the detected position data.

Abstract: To provide an authentication technology making it compatible to facilitate inputting of authentication information and to ensure the security. An authentication device connected to a transmitting terminal and a receiving terminal via a communication line, receives a message from the transmitting terminal, receives authentication information from the transmitting terminal, registers the message in association with the authentication information, receives a request with a purport of acquiring the message from the receiving terminal, determines, based on the authentication information received from the receiving terminal and the registered authentication information, whether to authenticate or not, and, if authenticated, transmits the message to the receiving terminal.

Abstract: A communication apparatus and method for channel switching for ad-hoc communication provides effective utilization of an infrastructure communication channel while preventing a deterioration in the quality of the infrastructure communication affected by a transmission signal used in the ad-hoc communication. Typically, the number of channels that can be used for a second communication is increased.

Abstract: A positioning device includes: a device body; a direction change detecting section that detects whether a traveling direction of the device body has been changed based on a detection of an azimuth with respect to reference axes preset in the device body; and an absolute position acquiring section that acquires an absolute position of the device body at a timing based on a change of the moving direction of the device body as detected by the direction change detecting section.

Abstract: A mobile station enables communication with a fixed station and other mobile stations. The mobile station includes a receiving unit receiving first timing information, second timing information and reliability information with regard to the second timing information. A selector selects a timing, to be used for communication timing with the fixed station or the other mobile stations, between the first timing information and the second timing information based on the reliability information.

Abstract: A digital baseband modulation apparatus includes: a spread modulation part for complex spreading an I component signal and a Q component signal of a send signal so as to output an output signal; and an amplitude conversion part for decreasing the amplitude component of the output signal to the half when the output signal is output on the I axis or on the Q axis.

Abstract: A communication apparatus and method for channel switching for ad-hoc communication provides effective utilization of an infrastructure communication channel while preventing a deterioration in the quality of the infrastructure communication affected by a transmission signal used in the ad-hoc communication. Typically, the number of channels that can be used for a second communication is increased.

Abstract: A communication apparatus based on the multi-carrier modulation system may be included in a mobile station or a base station for simultaneous transmission and reception with a simplified structure between the mobile station and base station using in common the same frequency band. A communication apparatus based on a multi-carrier modulation system for simultaneous communications with a plurality of sub-carriers using a plurality of sub-carriers modulated with data respectively, comprising a transmitting unit operable to transmit data with a plurality of sub-carriers by modulating a sub-carrier among the plurality of sub-carriers with data, and operable to use the other sub-carriers a receiving band without modulation with the data.

Abstract: A mobile radio system for radio communications between a base station and a plurality of mobile stations, as well as among a plurality of mobile stations, including a mobile radio channel assignment method, where each mobile station is capable of acquiring position information of the current position of the mobile station, as well as assigning a frequency channel for radio communications. The mobile station transmits and receives information using the assigned frequency channel, corresponding to the acquired position information.

Abstract: To reduce the processing load such as channel assignment and an authentication process in a plurality of radio base stations and communication terminals, and quickly and efficiently assign channels to the communication channels. The channel assigning method by a radio base station group, includes determining assignment of a communication channel between a communication terminal entering a radio area of the radio station group and all radio base stations within the radio station group by a base station in the radio base station group. Channel assigning information common to the radio base station group is updated as to the determined communication channel and a communication channel is assigned to the communication terminal with reference to the channel assigning information by each radio base station in the radio base station group other than the radio base station.

Abstract: To effectively utilize an infrastructure communication channel and increase a number of channels available for ad-hoc communication in a mobile communication apparatus enabling communication in an infrastructure communication mode for radio communication via a base station and in an ad-hoc communication mode for direct radio communication with another mobile communication apparatus, by providing a communication channel recognizer to recognize an infrastructure communication channel which does not interfere with an infrastructure communication within a radio service area of a base station, from among the infrastructure communication channels assigned for the infrastructure communication and a communication channel diverter to control utilizing a infrastructure communication channel, recognized by the communication channel recognizer, as a channel for the ad-hoc communication mode.

Abstract: A mobile station enables communication with a fixed station and other mobile stations. The mobile station includes a receiving unit receiving first timing information, second timing information and reliability information with regard to the second timing information. A selector selects a timing, to be used for communication timing with the fixed station or the other mobile stations, between the first timing information and the second timing information based on the reliability information.

Abstract: An appearance of other mobile wireless station within a communication area of a second wireless communication system of a main mobile wireless station when the main mobile wireless station is in the communication area of a wireless base station of the first wireless communication system, is automatically detected. Communications with other mobile wireless station are autonomously started by a second wireless communication system and communications with the wireless base station are performed by the first wireless communication system. Communication content from the wireless base station of the first wireless communication system and communication content from the other mobile wireless station of the second wireless communication system are mutually relayed. The relay control is terminated when the other mobile wireless station moves outside the communication area of the second wireless communication system of the main mobile wireless station.

Abstract: To provide an authentication technology making it compatible to facilitate inputting of authentication information and to ensure the security. An authentication device connected to a transmitting terminal and a receiving terminal via a communication line, receives a message from the transmitting terminal, receives authentication information from the transmitting terminal, registers the message in association with the authentication information, receives a request with a purport of acquiring the message from the receiving terminal, determines, based on the authentication information received from the receiving terminal and the registered authentication information, whether to authenticate or not, and, if authenticated, transmits the message to the receiving terminal.

Abstract: In a CDMA receiver for applying despread processing to direct wave or delayed waves that arrive via each path of multiple paths, applying synchronous detection processing to the despread signals obtained, combining the detection signals of respective paths and discriminating the received data on the basis of the combined signal, (1) a weighting unit provided for every path measures power of delayed received waves that arrive via its own path and, if the reception power is less than a set level (breakpoint level), subjects an output signal to weighting conforming to the reception power; (2) a RAKE combiner combines signals output from the weighting units of the respective paths; and (3) a data discrimination unit discriminates receive data based upon the output signal of the combiner.