Abstract: A variable resonator that comprises a loop line (902) to which two or more switches (903) are connected and N of reactance circuits (102) (N?3), in which switches (903) are severally connected to different positions on the loop line (902), the other ends of the switches are severally connected to a ground conductor, and the switches are capable of switching electrical connection/non-connection between the ground conductor and the loop line (902), the reactance circuits (102) severally have the same reactance value, the loop line (902) has a circumference corresponding to one wavelength or integral multiple thereof at a resonance frequency corresponding to each reactance value of each reactance circuit, and the reactance circuits (102) are electrically connected to the loop line (902) as branching circuits along the circumference direction of the loop line (902) at equal electrical length intervals.

Abstract: The invention has a step where a transmitting station in a second radio communication system determines whether transmission of a second radio communication system signal using a shared frequency band is possible or not based on load information of a first radio communication system broadcast from a base station in the first radio communication system, a step where the transmitting station in the second radio communication system calculates predicted interference power caused in a receiving station in the first radio communication system by the second radio communication system signal transmitted using the shared frequency band, and a step where the base station in the first radio communication system increases an allowable interference level of a first radio communication system signal transmitted using the shared frequency band based on the predicted interference power broadcast from the transmitting station in the second radio communication system.

Abstract: An object is to improve the quality of a reproduced picture and improve the efficiency of predicting a picture using the reproduced picture as a reference picture. For this object, a video prediction encoder 1 comprises an input terminal 101 which receives a plurality of pictures in a video sequence; an encoder which encodes an input picture by intra-frame prediction or inter-frame prediction to generate compressed data and encodes parameters for luminance compensation prediction between blocks in the picture: a restoration device which decodes the compressed data to restore a reproduced picture: a filtering processor 113 which determines a filtering strength and a target region to be filtered, using the parameters for luminance compensation prediction between the blocks and performs filtering on the reproduced picture, according to the filtering strength and the target region to be filtered; and a frame memory 104 which stores the filtered reproduced picture, as a reference picture.