Point-to-multipoint radio transmission system

A point-to-multipoint radio transmission system, comprising:

• a central station utilizing a first set of transmission channels and including at least one central station modem for each channel of the first set of the transmission channels;
• subscriber stations utilizing a second set of transmission channels, each of the subscriber stations including at least one subscriber modem, each respective modem of the at least one station modem and of the at least one subscriber modem having two transmitting channels and two receiving channels, at least one signal being transmitted in the respective modem via only one of the transmitting or receiving channels;
• and
• a control device adjusting at least one transmission parameter in at least one of the station and subscriber modems when a change occurs in one of the first and second sets of transmission channels, the at least one transmission parameter being adjusted to optimally utilize a bandwidth of an available radio channel, the at least one transmission parameter including at least one of a channel carrier frequency, a data rate, a modulation, a coding, a transmit level and signal quality evaluation parameters,
• wherein, when the change occurs in one of the first and second sets of transmission channels, the control device adjusts further transmission parameters in a non-operating channel of the two transmitting channels or the two receiving channels, while the at least one signal is transmitted on a further channel of the two transmitting channels or the two receiving channels,
• wherein, when the further transmission parameters are acquired, the control device switches to the non-operating channel, and
• wherein at least one modem of the station and subscriber modems includes:
• a first frequency splitter dividing an entire frequency band available for transmitting the at least one signal into at least two first subbands, wherein the at least one transmitting channel signal is selectively assigned to the at least two first subbands;
• and
• a second frequency splitter dividing the entire frequency band available for receiving the at least one signal into at least two second subbands, wherein the at least one subband signal is selectively assigned to the two receiving channels.