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1. (WO2018001763) IMPROVED FEEDBACK IN MISO SYSTEMS

Pub. No.:    WO/2018/001763    International Application No.:    PCT/EP2017/064873
Publication Date: Fri Jan 05 00:59:59 CET 2018 International Filing Date: Tue Jun 20 01:59:59 CEST 2017
IPC: H03F 1/32
H03F 3/189
H03F 3/21
Applicants: NOKIA SOLUTIONS AND NETWORKS OY
Inventors: NADER, Charles
JELONNEK, Bjoern
Title: IMPROVED FEEDBACK IN MISO SYSTEMS
Abstract:
It is provided a method for providing feedback to pre-distorters in branches of a MISO system such that the pre-distortion cancels distortions caused by the signal path and the combiner combining the signals from the branches into which input signals are input. The method comprises generating uncorrelated noises and mixing them with the input signals, evaluating the output of the combiner based on the input signals and the noises in order to determine a respective contribution of each input signal to the output of the combiner, and accordingly determining an appropriate pre-distortion. The signal path may apply a non-linear and/or dynamic function on the signal.