| 摘要 |
PURPOSE:To attain optional connection between lots of small-sized earth stations and direct mutual communication by combining frequency multiplex and code division multiplex so as to split a transmission frequency band into lots of channels, thereby assigning the result as an inherent channel to each small size earth station. CONSTITUTION:A small sized inter-earth station communication equipment consists of a transmission section 10 of a small sized earth station, a communication satellite 20 receiving a transmission signal from a reception section 10 and the reception section 30 of an opposite small sized earth station receiving the output of the satellite 20. Then K-kind (K is a natural number) of channel separation numbers of code split multiplex CDM and L-kind (L is a natural number) channels of frequency division multiplex FDM are combined to attain KXN kinds of channel separation numbers and the inherent channel is assigned respectively to each small-sized earth station. Thus, optional connection is attained among lots of small-sized earth stations, a large spread spectrum ratio is given to the transmission section, a large processing gain is obtained at the transmission section and mutual communication is attained directly by using a single frequency band. |
