US 11,057,004 B2
Multiband digital predistorter
Helen H. Kim, Sudbury, MA (US); Alexandre Megretski, Concord, MA (US); Yan Li, Lexington, MA (US); Kevin Chuang, Cambridge, MA (US); Zohaib Mahmood, Westwood, MA (US); and Yanyu Huang, Bedford, MA (US)
Assigned to NanoSemi, Inc., Waltham, MA (US)
Appl. No. 16/487,969
Filed by NanoSemi, Inc, Waltham, MA (US)
PCT Filed Feb. 23, 2018, PCT No. PCT/US2018/019481
§ 371(c)(1), (2) Date Aug. 22, 2019,
PCT Pub. No. WO2018/156932, PCT Pub. Date Aug. 30, 2018.
Claims priority of provisional application 62/463,616, filed on Feb. 25, 2017.
Prior Publication US 2020/0028476 A1, Jan. 23, 2020
Int. Cl. H03F 1/32 (2006.01); H03F 3/24 (2006.01); H03F 3/68 (2006.01); H04B 1/00 (2006.01); H04B 1/04 (2006.01)
CPC H03F 1/3247 (2013.01) [H03F 3/24 (2013.01); H03F 3/68 (2013.01); H04B 1/0067 (2013.01); H04B 1/0475 (2013.01); H03F 2200/111 (2013.01); H03F 2200/451 (2013.01); H04B 2001/0425 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A method for digital predistortion of multiband signals, the method comprising:
receiving a plurality of input signals respectively in multiple different frequency bands, the plurality of input signals occupying an input frequency span equal to a difference between a maximum frequency in a highest of the multiple different bands and a minimum frequency in a lowest of the multiple different bands;
frequency shifting at least one signal from the plurality of input signals to produce condensed shifted signals, each corresponding to a respective one of the plurality of input signals, occupying a condensed frequency span smaller than the input frequency span; and
processing the condensed shifted signals, including applying digital predistortion to the condensed shifted signals.