US 12,126,414 B2
Pre-equalization using beamforming functionality
Miguel Berg, Sollentuna (SE); Roland Smith, Nepean (CA); and Elmar Trojer, Täby (SE)
Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
Appl. No. 18/252,089
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Nov. 17, 2021, PCT No. PCT/IB2021/060675
§ 371(c)(1), (2) Date May 8, 2023,
PCT Pub. No. WO2022/107024, PCT Pub. Date May 27, 2022.
Claims priority of provisional application 63/115,778, filed on Nov. 19, 2020.
Prior Publication US 2023/0403056 A1, Dec. 14, 2023
Int. Cl. H04B 7/06 (2006.01); H04B 3/06 (2006.01)
CPC H04B 7/0617 (2013.01) [H04B 3/06 (2013.01)] 24 Claims
OG exemplary drawing
 
1. A method performed at a network node to compensate for a frequency response of a hybrid fiber cable network served by the network node, the method comprising:
determining an uplink channel estimate of the hybrid fiber cable network based at least in part on references signals received from consumer premises equipment, CPE, in the hybrid fiber cable network;
determining a downlink channel estimated based at least in part on an inverse of the uplink channel estimate;
mapping a first downlink signal to a plurality of layer-specific signals, each layer-specific signal being associated with a layer of a plurality of layers, a frequency and a set of beamforming weights, each set of beamforming weights being based at least in part on the downlink channel estimate;
for each layer-specific signal, applying beamforming weights to symbols of the layer-specific signal to produce a layer-specific downlink signal; and
summing the layer-specific downlink signals to produce a frequency-compensated downlink signal for transmission on a hybrid fiber cable of the hybrid fiber cable network.