US 11,844,034 B2
Method and apparatus for transmitting and receiving signal in frequency-asynchronous non-orthogonal multiple access system
Kwonjong Lee, Suwon-si (KR); Hakkeon Lee, Seoul (KR); Insik Jung, Seoul (KR); Daesik Hong, Seoul (KR); and Hyojin Lee, Suwon-si (KR)
Assigned to Samsung Electronics Co., Ltd., Suwon-si (KR); and INDUSTRY-ACADEMIC COOPERATION FOUNDATION, YONSEI UNIVERSITY, Seoul (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR); and INDUSTRY-ACADEMIC COOPERATION FOUNDATION, YONSEI UNIVERSITY, Seoul (KR)
Filed on Jul. 30, 2021, as Appl. No. 17/390,146.
Claims priority of application No. 10-2020-0098800 (KR), filed on Aug. 6, 2020.
Prior Publication US 2022/0046560 A1, Feb. 10, 2022
Int. Cl. H04W 56/00 (2009.01); H04L 25/02 (2006.01); H04W 24/08 (2009.01); H04L 5/00 (2006.01)
CPC H04W 56/001 (2013.01) [H04L 5/0048 (2013.01); H04L 25/0202 (2013.01); H04W 24/08 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method for transmitting a signal by a base station in a frequency-asynchronous non-orthogonal multiple access (FA-NOMA) system, the method comprising:
generating a first symbol signal comprising first modulation symbols for a first user equipment (UE) and pilot symbols;
generating a second symbol signal comprising second modulation symbols for a second UE without at least one pilot symbol;
identifying that the first symbol signal includes the pilot symbols;
determining the first symbol signal to which no frequency offset is applied based on identifying that the first symbol signal includes the pilot symbols;
identifying that the second symbol signal does not include at least one pilot symbol;
determining the second symbol signal to which a frequency offset is applied based on identifying that the second symbol signal does not include at least one pilot symbol;
pre-processing the second symbol signal based on a pre-processing matrix;
applying the frequency offset to the pre-processed symbol signal to generate a third symbol signal;
performing inverse fast fourier transform (IFFT) of the first symbol signal and the third symbol signal to generate an orthogonal frequency division multiplexing (OFDM) signal; and
transmitting the OFDM signal to the first UE and the second UE,
wherein the pre-processing matrix is determined based on information about interference caused to the pilot symbols by the frequency offset.