Abstract: The analog signal buffer is connected with a photoelectric converter to convert an optical image to an analog signal and an analog signal processing circuit to convert the analog signal to a digital signal, and transmits the analog signal to the analog signal processing circuit. The analog signal buffer includes a first buffer having a NPN transistor; and a second buffer having a PNP transistor. The first buffer includes a circuit to block a reverse current caused in the analog signal buffer by dropping of a voltage output from the photoelectric converter.

Abstract: In MBMS system, a plurality of MBMS areas are geographically arranged to provide multimedia broadcast/multicast service (MBMS) to wireless terminals located in the plurality of MBMS areas, the plurality of MBMS areas having cell pattern including single frequency network (SFN) using predetermined frequency band. The plurality of MBMS areas are arranged using different frequency bands to simultaneously provide different MBMSs to wireless terminal located at a given point.

Abstract: A communication system includes a unicast base station device, a multicast base station device, and a mobile station device. Before receiving information concerning a multicast service, the mobile station device transmits, to a position register server, identification information identifying a reception area in which a multicast service is provided. When receiving incoming call information indicating that information concerning a unicast service has been received, the multicast base station device transmits the incoming call information to the mobile station device. The mobile station device receives the incoming call information even while receiving the information concerning the multicast service.

Abstract: A communication system includes a reception device and at least one transmission device. The transmission device includes: a signal transmission unit which transmits at least one unicast signals and a multicast signal to the reception device. The reception device includes: a plurality of signal reception units which receive at least one the unicast signals and the multicast signal from the transmission device; a first control unit which receives the unicast signals from the transmission device using all of the plurality of signal reception units when only the unicast signals are received; and a second control unit which receives the unicast signals from the transmission device using some of the plurality of signal reception units, and simultaneously receives the multicast signal from the transmission device using another signal reception unit of the plurality of signal reception units, when the unicast signals and the multicast signal are received.

Abstract: A transmitter communicating with a receiver, the transmitter including: a first hopping sequence generation unit which generates a hopping sequence whose hopping subcarrier interval is less than or equal to a predetermined threshold value based on a cell ID; a first reference signal pattern generation unit which generates a reference signal pattern based on a reference signal basic pattern including a predetermined known signal sequence and the hopping sequence generated by the first hopping sequence generation unit; an arrangement unit which arranges the reference signal and a data symbol in a predetermined position within the symbol, based on the reference signal pattern generated by the first reference signal pattern generation unit; and a signal transmission unit which transmits the symbol having the reference signal and the data symbol arranged by the arrangement unit to the receiver.

Abstract: A transmitter which communicates with a receiver. The transmitter includes a null subcarrier allocation unit which allocates a null subcarrier based on a priority and a signal. The priority is for allocating a null subcarrier to each subcarrier. The priority is a ranking predetermined with the receiver. The signal is allocated to each subcarrier. The transmitter includes a transmission unit which transmits the signal using the subcarrier allocated by the null subcarrier allocation unit as the null subcarrier to the receiver.

Abstract: The present invention relates to an air compressor assembly. The compressor assembly includes an air tank, a compressor body, and a joining part for joining the air tank and the compressor body. The air tank has an axis therealong. The compressor body adjacent to the tank has an axis therealong for supplying compressed air to the air tank, the axis of the compressor body being disposed parallel to the axis of the tank. The compressor body includes a cylinder head, the cylinder head having an axis therealong, the axis of the cylinder head being disposed perpendicular to the axis of the compressor body and inclined to the tank.