US 12,177,043 B2
Pilot-less channel estimation and evaluation for LOS-MIMO microwave radio links
Sinh Nguyen, Gothenburg (SE); Cristian Czegledi, Gothenburg (SE); and Lei Bao, Gothenburg (SE)
Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
Appl. No. 18/039,866
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Dec. 3, 2020, PCT No. PCT/EP2020/084486
§ 371(c)(1), (2) Date Jun. 1, 2023,
PCT Pub. No. WO2022/117194, PCT Pub. Date Jun. 9, 2022.
Prior Publication US 2024/0048410 A1, Feb. 8, 2024
Int. Cl. H04L 25/02 (2006.01); H04B 7/0413 (2017.01)
CPC H04L 25/0204 (2013.01) [H04B 7/0413 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A computer-implemented method, performed in a network node, for estimating one or more relative channel gains (|hmn|2) and one or more channel phases (ϕmnH) associated with a wireless propagation channel between N transmit antennas and M receive antennas in a line-of-sight (LOS) multiple-input multiple-output (MIMO) communication system, the method comprising:
configuring a channel equalizer to compensate for differences in complex gain over the wireless propagation channel between the N transmit antennas and the M receive antennas;
configuring a phase tracker to compensate for differences in phase between a set of transmit side oscillators at the N transmit antennas and a set of receive side oscillators at the M receive antennas;
obtaining a set of equalizer coefficients (W) from the channel equalizer indicative of relative complex gain differences of propagation paths between the N transmit antennas and the M receive antennas;
obtaining a set of phase compensation values (E) from the phase tracker representing estimated phases of the set of transmit side oscillators and the set of receive side oscillators; and
upon the channel equalizer meeting a convergence criterion, estimating the one or more relative channel gains (|hmn|2) and the one or more channel phases based on an inverse function (ƒ(⋅)−1) of the set of equalizer coefficients (W) and the set of phase compensation values (E).