US 12,407,368 B2
System and method for increasing bandwidth for digital predistortion in multi-channel wideband communication systems
Wan-Jong Kim, Port Moody (CA); and Shawn Patrick Stapleton, Vancouver (CA)
Assigned to Dali Systems Co. Ltd, Grand Cayman (KY)
Filed by DALI SYSTEMS CO. LTD., Grand Cayman (KY)
Filed on Mar. 22, 2023, as Appl. No. 18/188,216.
Application 18/188,216 is a continuation of application No. 17/666,357, filed on Feb. 7, 2022, abandoned.
Application 17/666,357 is a continuation of application No. 16/943,227, filed on Jul. 30, 2020, granted, now 11,245,429, issued on Feb. 8, 2022.
Application 16/943,227 is a continuation of application No. 16/279,535, filed on Feb. 19, 2019, granted, now 10,749,553, issued on Aug. 18, 2020.
Application 16/279,535 is a continuation of application No. 14/918,371, filed on Oct. 20, 2015, granted, now 10,256,853, issued on Apr. 9, 2019.
Application 14/918,371 is a continuation of application No. 14/480,267, filed on Sep. 8, 2014, granted, now 9,197,259, issued on Nov. 24, 2015.
Application 14/480,267 is a continuation of application No. 13/625,760, filed on Sep. 24, 2012, granted, now 8,873,674, issued on Oct. 28, 2014.
Claims priority of provisional application 61/538,042, filed on Sep. 22, 2011.
Prior Publication US 2023/0370098 A1, Nov. 16, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04B 1/04 (2006.01); H03F 1/32 (2006.01); H04B 1/00 (2006.01); H04L 27/36 (2006.01)
CPC H04B 1/0475 (2013.01) [H03F 1/3241 (2013.01); H03F 1/3247 (2013.01); H04B 1/0017 (2013.01); H04L 27/368 (2013.01); H04B 2001/0425 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A non-transitory computer readable information storage media having instructions stored thereon, that when executed by one or more processors, cause to be performed a method of operating a communications system comprising:
receiving a signal at a digital predistorter (DPD) having a DPD bandwidth;
introducing predistortion to the signal using the DPD;
converting the predistorted signal to an analog signal using a digital-to-analog converter having a first bandwidth;
modulating the analog signal using a modulator;
amplifying the modulated signal;
filtering the amplified signal using a bandwidth less than the first bandwidth;
transmitting the filtered signal using an antenna;
frequency translating the amplified signal to an intermediate frequency signal;
sampling the intermediate frequency signal using an analog-to-digital converter having a second bandwidth less than the first bandwidth; and
extracting coefficients of the DPD from the sampled signal.