	US 12,218,785 B2
	Transmitter using symbol constellation rotation and spectrum shaping, transmission method thereof, receiver and reception method thereof in communication system
Joonho Cho, Pohang-si (KR); and Jeonghoon Choi, Pohang-si (KR)
Assigned to Samsung Electronics Co., Ltd., Suwon-si (KR)
Appl. No. 18/033,670
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
PCT Filed Sep. 1, 2021, PCT No. PCT/KR2021/011793 § 371(c)(1), (2) Date Apr. 25, 2023, PCT Pub. No. WO2022/092538, PCT Pub. Date May 5, 2022.
Claims priority of application No. 10-2020-0139615 (KR), filed on Oct. 26, 2020.
Prior Publication US 2023/0403185 A1, Dec. 14, 2023
Int. Cl. H04L 25/03 (2006.01); H04L 5/00 (2006.01); H04L 27/00 (2006.01); H04L 27/26 (2006.01)

CPC H04L 25/03828 (2013.01) [H04L 5/001 (2013.01); H04L 27/0008 (2013.01); H04L 27/2636 (2013.01)]

7 Claims

1. A discrete Fourier transform (DFT)-spread orthogonal frequency division multiplexing (OFDM) transmission method performed by a DFT-spread OFDM transmitter, the DFT-spread OFDM transmission method comprising:

constellation-rotating a symbol vector b comprising M pulse amplitude modulation (PAM) symbols by a constellation rotation angle ϕ to generate a constellation-rotated symbol vector d;

spreading the constellation-rotated symbol vector d with a size of M*1 by using a pruned DFT matrix W_L,Mto generate a pruned DFT-spread vector c;

performing a Hadamard product on the pruned DFT-spread vector c with a shaping vector s to generate a frequency domain spectrum shaped vector a, wherein the L is a number of subcarriers to be used in an allocated frequency range and the L is less than the M; and

allocating the frequency domain spectrum shaped vector a to the subcarrier,

wherein the shaping vector s is determined based on the M and the L, and

wherein in case that the M is an odd number, the constellation rotation angle ϕ is determined by

and 1-the element of the shaping vector s, S_l, is determined by

where 1=0, 1, 2. . . , L−1 and M/2≤L≤M/2.