摘要:
PROBLEM TO BE SOLVED: To provide an amplifier module for satellite, capable of facilitating maintenance therefor.SOLUTION: A method for operating an amplifier module 20 for a communication satellite includes the steps for determining an undesired state of the amplifier module 20, storing state data 82 indicating the undesired state into a non-volatile memory 70 of the amplifier module 20 after the undesired state is determined, and inactivating the amplifier module 20 after storing the state data 82.
摘要:
PROBLEM TO BE SOLVED: To provide a relay and distribution apparatus for a cellular communication system, the apparatus being capable of utilizing a high-order frequency reuse pattern with low control-channel overhead.SOLUTION: The relay and distribution apparatus comprises an antenna system configured to lay down beams in overlapping a first N-cell frequency reuse pattern and M second N-cell frequency reuse patterns. The first frequency reuse pattern may be for communication of control channels of a cellular communication system, and the second frequency reuse patterns may be for communication of traffic channels exclusive of control channels of the cellular communication system. The second frequency reuse patterns may be staggered with one another. Cells of the second frequency reuse patterns may have a size only a fraction of which is for transmission of traffic channels any of which may be assignable through a control channel of the first reuse frequency pattern.
摘要:
PROBLEM TO BE SOLVED: To provide a satellite mounted repeater which can improve communication performance.SOLUTION: The satellite mounted repeater has: RF reception sections 3-1 to 3-L which perform a predetermined reception processing to two or more reception signals respectively which are received by satellite mounted reception antennas 1-1 to 1-K; A/D conversion sections 4-1 to 4-L which convert the signal after reception processing is performed into a digital signal; wave dividing sections 5-1 to 5-L which decompose the digital signal into a plurality of narrow-band signals to output them; RF transmission sections 9-1 to 9-M which perform a predetermined transmission processing to transmission signals to be transmitted from satellite mounted transmission antennas 11-1 to 11-N; wave combining sections 7-1 to 7-M which combine the narrow-band signals to input them in the RF transmission sections 9-1 to 9-M; and a switch section 6 which specifies transmission frequencies to input the narrow-band signals into the wave combining sections 7-1 to 7-M so that the two or more reception signals may be transmitted by one transmission beam and frequency bands of the two or more reception signals may not be mutually overlapped.