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1. (WO2018197483) SPATIAL FILTERING TECHNIQUE

Pub. No.:    WO/2018/197483    International Application No.:    PCT/EP2018/060463
Publication Date: Fri Nov 02 00:59:59 CET 2018 International Filing Date: Wed Apr 25 01:59:59 CEST 2018
IPC: H04L 25/03
H04B 7/06
H04B 7/024
Applicants: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Inventors: FODOR, Gabor
ARDAH, Khaled
SILVA, Yuri C.B.
FREITAS JR., Walter C.
Title: SPATIAL FILTERING TECHNIQUE
Abstract:
A method of updating spatial filters in a radio network comprising at least two transmit nodes each in radio communication with at least one receive node on a Multiple-Input Multiple-Output (MIMO) radio channel, comprises transmitting, from the respective transmit node, first reference signals precoded by a first spatial filter of the respective transmit node; and receiving, from the receive nodes, second reference signals that are precoded using a second spatial filter of the respective receive node and an error matrix of the respective receive node. The second spatial filter depends on a channel estimate based on the transmitted first reference signals. The error matrix is indicative of an error of the first and second spatial filters in equalizing the MIMO radio channel. The method further comprises recomputing, for each of the at least one receive node in radio communication with the respective transmit node, the error matrix of the respective receive node; and updating the first spatial filter of the respective transmit node using the recomputed error matrix.