| 摘要 |
PURPOSE:To have a spectrum diffusion multiplex communication high in the band usage efficiency, by using a band split type spectrum diffusion multiplex communication system using a bit shift series. CONSTITUTION:The (i, j)-th subscribing signal is inputted to an input terminal 301 (i, j) and the signal is fed to a spectrum diffusion SS modulation multiplexer 302i. A synchronizing signal generating circuit 303i in which a modulating frame synchronizing signal is fed to the device 302i and the code for synchronizing reception is fed to an addition circuit 304i, is provided. The component only in the band Bi is picked up from the circuit 304i to the band limit filter 305i and after addition and synthesis 306, it is transmitted to a transmission line 307. On the other hand, entirely inverse conversion is made at a reception side from a transmission side, and a demodulation signal is outputted from an output terminal 311(i, j). Thus, a spectrum diffusion multiplex communication with high band usage efficiency can be made. |
