Patent ID: 8774196

Claim:
An active antenna array for a mobile communications network, the active antenna array comprising: a base band unit coupled to a base station; a plurality of transceiver units, wherein individual ones of the plurality of transceiver units are terminated by at least one antenna element; a measurement unit, connected with one of the plurality of transceiver units via a feedback path, wherein the measurement unit is operable to measure at least one of a transmit phase deviation, a transmit amplitude deviation, and a transmit delay; at least one adjustment unit in either the base band unit or one of the plurality of transceiver units for imposing at least one of a transmit phase compensation, a transmit amplitude compensation and a transmit delay compensation on the individual transmit signals; and at least one link coupling the individual ones of the plurality of transceiver units to the base band unit; wherein the at least one link is a digital link and is configured to relay an individual transmit signal concurrently and in synchronization with a transmit clock signal, wherein the transmit clock signal defines a sampling time of an individual digital to analogue converter converting the individual transmit signal; wherein the transmit delay compensation is imposed on the individual transmit signals based on said sampling time before relaying the individual transmit signals across the link.