US 11,929,865 B2
Signal modulation apparatus and signal modulation method
Eisaku Sasaki, Tokyo (JP); Xinyue Liu, London (GB); Izzat Darwazeh, London (GB); and Nader Zein, Heidelberg (GE)
Assigned to NEC Corporation, Tokyo (JP)
Filed by NEC Corporation, Tokyo (JP)
Filed on Jun. 7, 2022, as Appl. No. 17/834,162.
Claims priority of application No. 2021-105088 (JP), filed on Jun. 24, 2021.
Prior Publication US 2022/0417075 A1, Dec. 29, 2022
Int. Cl. H04L 27/36 (2006.01)
CPC H04L 27/36 (2013.01) 11 Claims
OG exemplary drawing
 
1. A signal modulation apparatus comprising
a memory configured to store an instruction; and
at least one processor configured to execute the instruction to modulate an input signal into a multidimensional Quadrature Amplitude Modulation (QAM) signal using multidimensional QAM, wherein
the multidimensional QAM is a QAM in which a two-dimensional M-QAM is configured in a multidimensional manner using a plurality of consecutive time slots,
the two-dimensional M-QAM is a QAM in which signal points of signal symbols representing a bit sequence are assigned to a two-dimensional plane with an in-phase axis and a quadrature axis,
M is an even power of 2 and is equal to or greater than 64,
a constellation for the multidimensional QAM is part of a combination of a first constellation and a second constellation,
the first constellation is a constellation of the two-dimensional M-QAM, and
the second constellation is a constellation of the following two-dimensional QAM:
(√M−1)2−QAM.