System for point to multipoint radio network (PMP)

摘要

The system connects a central, stationary terminal to several stationary terminals, using a modulation of one or more carrier frequencies. There is digital signal transmission over one or several, parallel frequency division multiplex (FDM) channels of a radio frequency band, using a synchronous time division multiplex (TDM) process for forming the TDM channels within the FDM channels. The radio terminals are fitted with high frequency (HF) end stages for one or more mobile radio frequency ranges, and HF end stages for the frequency ranges with low diffraction and reflection, but high radio wave attenuation for the simultaneous connection of terminals with and without visual connections, by the same system. In this way the service parameters are determined in operation.