US 12,126,471 B2
Method and device(s) for performing digital predistortion on signals for multiband transmission in a wireless communication network
S M Shahrear Tanzil, Ottawa (CA); and Ashim Biswas, Sollentuna (SE)
Assigned to Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Appl. No. 18/026,387
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Oct. 2, 2020, PCT No. PCT/SE2020/050930
§ 371(c)(1), (2) Date Mar. 15, 2023,
PCT Pub. No. WO2022/071837, PCT Pub. Date Apr. 7, 2022.
Prior Publication US 2023/0291620 A1, Sep. 14, 2023
Int. Cl. H03F 1/32 (2006.01); H04L 25/03 (2006.01); H04L 27/36 (2006.01)
CPC H04L 25/03343 (2013.01) [H03F 1/3247 (2013.01); H03F 1/3258 (2013.01); H04L 27/367 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method, performed by one or more devices, for performing digital predistortion, “DPD”, on multiple digital input signals to be transmitted in different frequency bands, respectively, of a wireless communication network, the different frequency bands being associated with linearization bandwidths, respectively, for application of the DPD, each linearization bandwidth extending from a predetermined first frequency below its associated frequency band to a predetermined second frequency above its associated frequency band, wherein the method comprises:
receiving said multiple digital input signals;
performing said DPD in two parts:
a first DPD part where a first DPD is performed for each of said multiple digital input signals over a signal's full linearization bandwidth using a first set of non-linear terms including a first set of basis functions, and
a second DPD part where a second DPD is performed for each of said multiple digital input signals over the signal's linearization bandwidth except where the linearization bandwidth covers a signal's frequency band using a second set of non-linear terms including a second set of basis functions; and
providing, based on both of said performed DPD parts, predistorted multiple digital output signals.