Patent ID: 11929865
Assignee: NEC CORPORATION
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
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:

(√{square root over (M)}−1)2−QAM.