US 12,003,353 B2
Coverage enhanced reciprocity-based precoding scheme
Mohammadreza Malek-Mohammadi, Solna (SE); and Karl Werner, Segeltorp (SE)
Assigned to Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Appl. No. 17/428,841
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Nov. 11, 2019, PCT No. PCT/IB2019/059678
§ 371(c)(1), (2) Date Aug. 5, 2021,
PCT Pub. No. WO2020/161537, PCT Pub. Date Aug. 13, 2020.
Claims priority of provisional application 62/802,064, filed on Feb. 6, 2019.
Prior Publication US 2022/0123971 A1, Apr. 21, 2022
Int. Cl. H04L 25/03 (2006.01); H04B 7/06 (2006.01); H04L 25/02 (2006.01)
CPC H04L 25/03898 (2013.01) [H04B 7/0617 (2013.01); H04L 25/0212 (2013.01); H04L 25/0224 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method performed by a radio node for determining precoding information, the method comprising:
determining channel estimates for at least a channel between the radio node and another device;
determining a plurality of precoding hypotheses based on the channel estimates;
determining a Figure of Merit (FOM) for each of the plurality of precoding hypotheses;
determining the precoding information based on the FOM for each of the plurality of precoding hypotheses;
performing matched filtering of received reference symbols and corresponding known reference symbols;
filtering an output of the matched filtering based on a plurality of precoding hypotheses;
applying a transform to the filtered output for the plurality of precoding hypotheses to produce a plurality of transformed precoding hypotheses;
calculating a FOM for each of the plurality of transformed precoding hypotheses; and
selecting a precoder that maximizes the FOM as the precoding information.