US 11,671,151 B2
Efficient peak-to-average-power reduction for OFDM and MIMO-OFDM
Steve Shattil, Cheyenne, WY (US)
Assigned to Tybalt, LLC, Boulder, CO (US)
Appl. No. 16/307,039
Filed by Genghiscomm Holdings, LLC, Boulder, CO (US)
PCT Filed Jul. 24, 2018, PCT No. PCT/US2018/043573
§ 371(c)(1), (2) Date Dec. 4, 2018,
PCT Pub. No. WO2019/023283, PCT Pub. Date Jan. 31, 2019.
Claims priority of provisional application 62/536,955, filed on Jul. 25, 2017.
Prior Publication US 2021/0226834 A1, Jul. 22, 2021
Int. Cl. H04L 27/26 (2006.01); H04B 7/0456 (2017.01)
CPC H04B 7/0456 (2013.01) [H04L 27/2615 (2013.01); H04L 27/2634 (2013.01); H04L 27/2642 (2013.01); H04L 27/26362 (2021.01)] 21 Claims
OG exemplary drawing
 
1. A method for reducing a peak-to-average power ratio (PAPR) of a discrete-time orthogonal frequency division multiplexing (OFDM) signal by selecting a signal with low PAPR from a plurality of candidate discrete-time OFDM signals, the method comprising:
generating a partial update discrete-time OFDM signal by performing a sparse invertible transform operation on a base data symbol sequence; and
linearly combining a base discrete-time OFDM signal and the partial update discrete-time OFDM signal to produce an updated discrete-time OFDM signal, the updated discrete-time OFDM signal being designated as one of the plurality of candidate discrete-time OFDM signals;
wherein the base discrete-time OFDM signal is generated by performing a dense invertible transform operation on the base data symbol sequence or is selected from a previous updated discrete-time OFDM signal.