System for combining output signals of two base stations

A system for combining output signals from first and second base stations for radiation from a common antenna arrangement, comprising:

• a transmitter unit provided between the first base station and the antenna arrangement, the transmitter unit containing a device for aggregate signal forming, a D/A converter and a transmission power amplifier;
• and
• a converting device connected between the second base station and the device for aggregate signal forming, the converting device producing a second digital input signal, which is supplied to the device for aggregate signal forming, the converting device having, connected to one another in series, a device for data recovery, a first digital filter, a device for digital frequency conversion and a second digital filter,
• wherein the first base station has an output connected to the device for aggregate signal forming such that an output signal from the first base station serves as a first digital input signal to the device for aggregate signal forming,
• wherein the device for aggregate signal forming forms an aggregate signal that reaches the antenna arrangement via the D/A converter and the transmission power amplifier,
• wherein the second base station produces a digital output signal which is supplied to the device for data recovery, and
• wherein the second digital filter produces the second digital input signal, which is supplied to the device for aggregate signal forming.