US 12,362,967 B2
Channel estimation for configurable surfaces
Salah Eddine Zegrar, Istanbul (TR); Liza Afeef Omar Shehab El Din, Istanbul (TR); and Hüseyin Arslan, Istanbul (TR)
Assigned to Vestel Elektronik Sanayi ve Ticaret A. S., Manisa (TR)
Appl. No. 18/043,349
Filed by Vestel Elektronik Sanayi ve Ticaret A. S., Manisa (TR)
PCT Filed Sep. 1, 2021, PCT No. PCT/EP2021/074113
§ 371(c)(1), (2) Date Feb. 28, 2023,
PCT Pub. No. WO2022/049112, PCT Pub. Date Mar. 10, 2022.
Claims priority of application No. 20193900 (EP), filed on Sep. 1, 2020.
Prior Publication US 2023/0421412 A1, Dec. 28, 2023
Int. Cl. H04L 25/02 (2006.01); H04B 7/08 (2006.01)
CPC H04L 25/0204 (2013.01) [H04B 7/086 (2013.01); H04B 7/0888 (2013.01); H04L 25/0224 (2013.01); H04L 25/0242 (2013.01); H04L 25/025 (2013.01)] 15 Claims
OG exemplary drawing
 
15. A method for setting, by a transmitting device, reflection coefficients of a configurable surface, the method comprising:
performing beamforming search for transmission of signals over a channel between the transmitting device and a receiving device, the channel comprising: reflection on the configurable surface, thereby obtaining:
trained reflection coefficients of the configurable surface, and
an angle of arrival (AoA) of the signals at the receiving device;
estimating an angle of departure (AoD) of the signals at the configurable surface from the AoA at the receiving device;
estimating, based on the AoA at the receiving device, estimated reflection coefficients of the configurable surface for an ideal channel between the transmitting device and the configurable surface;
estimating, according to a relation between the trained reflection coefficients and the estimated reflection coefficients, a modified channel matrix Ĝ of a second channel between the transmitting device and the configurable surface that accounts only for the phase change caused by the second channel; and
setting the reflection coefficients of the configurable surface according to
Θ=Θ(θAoAR,φAoAR,θdes,φdes)GoptĜH(ĜĜH)−1, wherein
Gopt(θAoAR, φAoAR, θAoDB, φAoDB) is a channel matrix of the ideal channel between the transmitting device and the configurable surface,
θAoDB and φAoDB are respectively an elevation and azimuth AoD at the base station for the ideal channel,
Θ(θAoAR, φAoAR, θdes, φdes) is a diagonal matrix comprising, on its diagonal, reflection coefficients corresponding to angles θAoAR, φAoAR, θdes, and φdes,
θdes is a target elevation AoD at the configurable surface,
φdes is a target azimuth AoA at the configurable surface,
θAOAR is a predetermined elevation AoA at the configurable surface, and
φAOAR is a predetermined azimuth AoA at the configurable surface.