Tazuko Tomioka

TL;DR: In this article, a cognitive radio system includes a state detecting device that scans a frequency band allocated to another radio system than the CR system to detect a first use state of the frequency band; a first server including a first gathering unit that receives first information relating to the first use-state and a second gathering unit; a second server that stores a second use-State of the spectrum allocated to the other radio system; and a notifying unit that notifies a CR system of information of an available channel based on the first information and the second information.

TL;DR: In this paper, a data transmitting apparatus generates a block that includes identification information including the number of times divided data can be transmitted and data for error detection for detecting an error in the identification information associated with each other with respect to each divided data, and transmits the block to a data receiving apparatus.

TL;DR: In this article, a glass rod is arranged to be contacted tightly with an optical fiber ferrule to guide light emitted from a semiconductor laser device to an optical fibre, and a fine adjustment stage is driven in the direction perpendicular to the optical axis of the semiconductor device on the basis of the information of the positional shift to position the device.

TL;DR: In this article, a cognitive communication system consisting of a medium estimator 104 provided in a radio terminal 1005 for detecting whether the radio channel allocated to the other radio equipment is in use or in a free state was proposed.

TL;DR: In this article, a communication apparatus includes unit measuring a first interference feature quantity indicating a state of an interference signal in a transmission frequency band (TFB), unit determining from the first feature quantity whether the interference signal exists in the TFB, unit acquiring, after measurement of the first interference measure quantity, a transmission channel from a second interference measure, measured by the measuring unit, the transmission channel corresponding to at least one of a frequency orthogonal to the interference signals, a time orthogonality, and a spreading code, and unit performing a first transmission using the TF