US 12,068,901 B2
Techniques for peak-to-average-power-ratio reduction in a discrete Fourier transform domain for wireless waveforms
Jing Jiang, San Diego, CA (US); Peter Gaal, San Diego, CA (US); John Edward Smee, San Diego, CA (US); Pushkar Bajirao Kulkarni, San Diego, CA (US); Hari Sankar, San Diego, CA (US); Sanghoon Kim, Saratoga, CA (US); and Seyong Park, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Oct. 29, 2021, as Appl. No. 17/514,996.
Prior Publication US 2023/0133797 A1, May 4, 2023
Int. Cl. H04L 27/26 (2006.01); H04W 72/04 (2023.01); H04W 72/044 (2023.01)
CPC H04L 27/2614 (2013.01) [H04W 72/044 (2013.01)] 26 Claims
OG exemplary drawing
 
1. A method for wireless communication at a device, comprising:
applying a first phase ramp to a first set of frequency-domain tones to obtain a phase-ramped set of frequency-domain tones;
performing, subsequent to applying the first phase ramp to the first set of frequency-domain tones, a first frequency-domain to time-domain transform on the first set of frequency-domain tones to obtain a first set of time-domain samples, wherein the first frequency-domain to time-domain transform has a first transform size, wherein the first phase ramp corresponds to a first time-domain shift for the first set of time-domain samples, and wherein performing the first frequency-domain to time-domain transform comprises performing the first frequency-domain to time-domain transform on the phase-ramped set of frequency-domain tones;
performing a crest factor reduction function on the first set of time-domain samples to obtain a second set of time-domain samples;
performing a first time-domain to frequency-domain transform on the second set of time-domain samples to obtain a pre-distorted set of frequency-domain tones;
applying an inverse of the first phase ramp to the pre-distorted set of frequency-domain tones to remove the first time-domain shift and to obtain a first pre-distorted set of frequency-domain tones;
mapping the pre-distorted set of frequency-domain tones to at least a portion of a second set of frequency-domain tones, wherein the second set of frequency-domain tones is larger than the first set of frequency-domain tones;
performing a second frequency-domain to time-domain transform on the second set of frequency-domain tones to obtain a third set of time-domain samples, wherein the second frequency-domain to time-domain transform has a second transform size that is larger than the first transform size; and
transmitting signaling based at least in part on the third set of time-domain samples, wherein transmitting the signaling is based at least in part on applying the inverse of the first phase ramp to the pre-distorted set of frequency-domain tones to remove the first time-domain shift.