US 12,137,009 B2
Determining similarity between channel estimations
Faezeh Alavi, Gothenburg (SE); Jöran Roslund, Gothenburg (SE); and Gunilla Sjöström, Gothenburg (SE)
Assigned to Telefonaktiebolaget LM Ericsson (Publ), Stockholm (SE)
Appl. No. 18/248,569
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Oct. 15, 2020, PCT No. PCT/EP2020/079056
§ 371(c)(1), (2) Date Apr. 11, 2023,
PCT Pub. No. WO2022/078606, PCT Pub. Date Apr. 21, 2022.
Prior Publication US 2023/0412426 A1, Dec. 21, 2023
Int. Cl. H04L 25/02 (2006.01); H04L 5/00 (2006.01)
CPC H04L 25/0202 (2013.01) [H04L 5/0048 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A control unit for controlling transmission of reference signals, the reference signals being transmitted with a reference signal density, the control unit being configured to:
provide a plurality of channel estimates which are separated in time during a certain first time period;
represent each channel estimate by a corresponding complex channel vector in a complex vector space, each channel estimate constituting an estimated channel for a radio channel provided between at least two wireless communication nodes, the radio channel constituting a medium via which signals transmitted between nodes are transferred;
calculate a difference angle between two of the complex channel vectors which are separated in time during a certain second time period, forming a pair of complex channel vectors, the difference angle being a Kähler angle (θK); and
configure the reference signal density based on the calculated Kähler angle (θK).