Calibration method for an adaptive antenna system
A method and a system are disclosed for achieving calibration with a minimum of hardware implementations. The method and system apply to base stations that have a &#8220;full adaptive antenna&#8221; implementation. The calibration accounts for irregularities from the source generator through channelizers, up-converters, mixers, power-amplifiers, and filters. A proposed illustrative embodiment of the set-up and routine accomplishes both transmit path and receive path calibration. An arrangement according to the invention uses the internal base station radio parts by sequentially switching signal paths from transmitter to receiver and thereby not needing external equipment. The necessary hardware switching then is combined with the duplex filters preferably positioned close to the base station. The method can simply be visualized by means of a basic flow diagram illustrating the three main steps being a first step of receive calibration to be repeated for all available receive frequencies, a second step of pre-transmit calibration and a third step of transmit calibration to be repeated for all available transmit frequencies.
Telefonaktiebolaget LM Ericsson (publ)
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inventional inventional inventional inventional
Karsten Leonard Magnus Eberhard
Kruger Rexberg Johansson Pauck