Communication systems in general routinely have up to 1024 modulation symbols (32 voltage levels for both the sin and cos carrier). http://en.wikipedia.org/wik

Communication systems in general routinely have up to 1024 modulation symbols (32 voltage levels for both the sin and cos carrier). http://en.wikipedia.org/wiki/Quadrature_amplitude_modulation#Quantized_QAM http://en.wikipedia.org/wiki/Quadrature_amplitude_modulation...