| 摘要 |
PURPOSE:To allow a master station to identify a come from which slave station it comes even when each slave set sends the code with a same transmission frequency by allocating a spread code to each slave set for the transmission and reception. CONSTITUTION:An output of a reception circuit 26 is inputted to a spread code identification circuit 30. The circuit 30 uses spread codes PN1-PNn used by slave sets 14-1-14-n to apply inverse spread processing to a reception signal. The inverse spread processing is implemented by providing n-set of inverse spread circuits whose spread codes are set respectively to be the PN1-PNn in parallel and inputting the reception signal to them in common. Then to which slave set the signal is sent is identified by discriminating the spread code able to be processed actually by means of the inverse spread processing. |
