Base station and a method for operating the base station

A method of operating a base station for a wireless communication network, the base station comprising:

• a central unit;
• and a remote radio unit (RRU) comprising a plurality of antennas, wherein the RRU is coupled to the central unit via a plurality of optical transmission fibers, wherein each optical transmission fiber of the plurality of optical transmission fibers defines a respective downlink transmission channel, the RRU comprising a coupler configured to couple, selectively, the respective downlink transmission channels with the uplink feedback channel,
• wherein the method comprises:
• transmitting a respective downlink transmission signal from a respective one of the downlink transmission channels to a respective antenna of the plurality of antennas of the RRU;
• selectively coupling, via the coupler, the respective one of the downlink transmission channels with the uplink feedback channel;
• and
• providing a respective uplink feedback signal based on the respective downlink transmission signal via the uplink feedback channel to the central unit for reducing non-linear distortions of the respective downlink transmission signal.

A system comprising a base station for a wireless communication network, the base station comprising:

• a central unit;
• a remote radio unit (RRU), comprising:
• a plurality of antennas, wherein
• the RRU is coupled to the central unit via a plurality of optical transmission fibers, wherein
• each optical transmission fiber of the plurality of optical transmission fibers defines a respective downlink transmission channel,
• the RRU comprising a coupler configured to couple, selectively, the respective downlink transmission channels with the uplink feedback channel;
• and
• one or more tangible, non-transitory, computer-readable media storing instructions that, when executed by a processor of the base station, cause operations to be performed comprising:
• transmitting a respective downlink transmission signal from a respective one of the downlink transmission channels to a respective antenna of the plurality of antennas of the RRU;
• selectively coupling, via the coupler, the respective one of the downlink transmission channels with the uplink feedback channel;
• and
• providing a respective uplink feedback signal based on the respective downlink transmission signal via the uplink feedback channel to the central unit for reducing non-linear distortions of the respective downlink transmission signal.