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

Claim 5:
6. 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 N-QAM is configured in a multidimensional manner using a plurality of consecutive time slots,
the two-dimensional N-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,
N is an odd power of 2 and is equal to or greater than 32,
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 N-QAM, and
the second constellation is a constellation of the following two-dimensional QAM:, (
    
     
      
       N
       2
      
     
     +
     1
    
    )
   
   2
  
  -
  QAM