64-QAM

• See QAM (Quadrature Amplitude Modulation)
• The 64-QAM is a specific case of M-ary QAM scheme in which a carrier wave of fixed frequency can exist in one of sixty four different states in the constellation plot.
• Each symbol consists of six bits out of 64 different possible combinations ranging from 000000 to 111111.
• Therefore, the number of bits that can be accomodated in a symbol is 6. Since, this scheme uses binary data to perform modulation and demodulation, the number of combinations possible with six bits is 26 i.e. 64.
• Or equivalently, the number of bits that can be accomodated as per equation 2 is log2 64 = 6.