Apple Inc.

Elisabeth De Carvalho

Carles Navarro Manchon

Carles Navarro-Machon

The disclosure relates to techniques for beamforming in multi-user systems. The disclosure particularly relates to a base station for communication with multiple user terminals, the base station comprising: a digital precoder and an analog precoder which are configured to precode a first training signal; a radio transceiver configured to transmit the precoded first training signal and to receive a precoded second training signal upon transmission of the precoded first training signal; and a controller configured to adjust a precoding of the digital precoder based on processing of the second training signal with respect to a normalization criterion and to adjust a precoding of the analog precoder based on processing of the second training signal with respect to a multi-user beamforming criterion.

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Norresundby, Denmark

Elisabeth De Carvalho