Wireless system for transmitting data between a base station and a relay antenna of a mobile telephony network

A wireless data transmission system for communication between a base station and a relay antenna of a mobile telephone network, comprising:

• at least one bidirectional link which includes at least two routes, each route including at least one transmission channel and one reception channel for electromagnetic signals;
• and
• at least one frequency isolation unit for separating channels in frequency, wherein
• the link comprises a first electronic device including a first antenna associated with the relay antenna and a second electronic device including a second antenna associated with the base station,
• the frequency isolation unit includes a first filter and a second filter, wherein the first filter and the second filter provide an isolation less than a total predetermined isolation,
• the first antenna provides two polarizations of electromagnetic signals,
• the second antenna provides two polarizations of electromagnetic signals,
• the isolation provided by the first filter, the second filter, and one of the first antenna and the second antenna add to produce the total predetermined isolation,
• one polarization of the first and second antennas is assigned to the transmission channel and the reception channel of one route,
• the other polarization of the first and second antennas is assigned to the transmission channel and the reception channel of the other route, and
• each route includes a separator unit providing separation from additional channels.