| 摘要 |
PURPOSE:To effectively use frequencies and to considerably reduce the interference between zones. CONSTITUTION:Plural radio zones 12 each of which consists of one master station and plural slave stations which perform radio communication in the spread spectrum system are formed, and at least adjacent radio tones 12 use frequency bands f1 to f4 different from each other, and repeating radio zones which repeat and use the same frequency band use the same spread code and have frequencies offset from the center frequency by frequencies DELTAf and 2DELTAf equal to integer-fold information transmission speed, and extents of offset frequency are made different between close repeating radio zones, and thus radio communication between the master station and slave stations is performed in each radio zone 12. |
