US 11,991,029 B2
Physical random access channel signal generation optimization for 5G new radio
Raymundo Ramirez-Gutierrez, Lund (SE); and Naga Anjaneya Chandra Sekhara Reddy Ireddy, Stockholm (SE)
Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
Appl. No. 17/268,493
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Aug. 20, 2018, PCT No. PCT/EP2018/072448
§ 371(c)(1), (2) Date Feb. 15, 2021,
PCT Pub. No. WO2020/038550, PCT Pub. Date Feb. 27, 2020.
Prior Publication US 2021/0315021 A1, Oct. 7, 2021
Int. Cl. H04W 72/04 (2023.01); H04L 27/26 (2006.01); H04W 72/0446 (2023.01); H04W 74/0833 (2024.01)
CPC H04L 27/2613 (2013.01) [H04L 27/2628 (2013.01); H04W 72/04 (2013.01); H04W 72/0446 (2013.01); H04W 74/0833 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for physical random access channel (PRACH) signal generation, the method comprising:
obtaining a first time-domain sequence comprising a first set of time-domain samples;
generating a second time-domain sequence comprising a second set of time-domain samples, the second set of time-domain samples comprising the first set of time-domain samples and interpolated time-domain samples inserted between the samples of the first set of time-domain samples, wherein a number of time-domain samples in the second set of time-domain samples matches a required number of samples needed for a digital-to-analog converter (DAC) having a predetermined sampling rate;
providing the second time-domain sequence to the DAC;
determining a first index of the first time-domain sequence, wherein the first index is configured to define a subset of the first set of time-domain samples comprising the time-domain samples between the first index and a second index corresponding to the last time-domain sample of the first time-domain sequence;
wherein the subset comprises a number of time-domain samples for generation of a number of time-domain samples corresponding to a cyclic prefix of the second time-domain sequence by insertion of interpolated time-domain samples between the samples of the subset; and
generating a cyclic prefix comprising the determined subset of time-domain samples and interpolated time-domain samples inserted between the samples of the determined subset, a number of time-domain samples in the cyclic prefix comprising a number of samples needed for matching the required number of samples needed for the DAC sampling rate.