[DOCSIS 3.0][SPEC] 6.2.14 Symbol Mapping

[DOCSIS 3.0][SPEC]  6.2.14 Symbol Mapping

6.2.14 Symbol Mapping (Map the Data Stream into Modulator Symbols) (Ref1 - page 48)

 x1 represents the LSB of each of the symbol maps

 x2, x3, x4, x5,x6 and x7 represents the MSB for QPSK, 8-QAM, 16-QAM, 32-QAM, 64-QAM, and 128-QAM respectively.

 

 MSB MUST be the first bit in the serial data into the symbol mapper.

 

 Reference :

• 
  Docsis 3.0 - Physical Layer Specification


• 
  IQ Modulation