Antenna system and base station system

A base station system, comprising an antenna system and a second antenna apparatus, wherein the antenna system comprises:

• a first antenna apparatus and at least one pair of receiving channels, wherein:
• the first antenna apparatus comprises:
• a first antenna element array, a first combiner-splitter, and an active module;
• the first antenna element array comprises a plurality of antenna elements, wherein the antenna elements are configured to receive and transmit signals in two different polarization directions;
• the first combiner-splitter is configured to combine, in the two different polarization directions, signals wherein the signals are received by the plurality of antenna elements in the first antenna element array;
• the active module is configured to receive signals combined by the first combiner-splitter in the two different polarization directions, and to perform frequency translation on the signals combined by the first combiner-splitter to obtain baseband signals;
• the at least one pair of receiving channels are connected to the second antenna apparatus, wherein the second antenna apparatus is configured to output signals in the two different polarization directions, and the at least one pair of receiving channels are configured to receive signals output by the second antenna apparatus;
• and
• the active module is further configured to perform frequency translation on the signals received by the at least one pair of receiving channels to obtain baseband signals.