What does 32.64QAM mean? Is QAM a unit?

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QAM is a kind of vector modulation, which maps the input bits (usually using Gray code) to a complex plane (constellation) to form a complex modulation symbol, and then amplitude modulates the I and Q components of the symbol (corresponding to the real and imaginary parts of the complex plane, that is, the horizontal and vertical directions) on two mutually orthogonal carriers (cos wt and sin wt) respectively. In this way, compared with amplitude modulation (AM), its spectrum utilization will be improved by 1 times. QAM is a technique of combined amplitude and phase modulation, which uses both amplitude and phase of carrier to transmit information bits, so it can achieve higher frequency band utilization under the same minimum distance. At present, the highest QAM has reached 1 024-QAM( 1 024 samples). The more samples, the higher the transmission efficiency. For example, for a 16-QAM signal with 16 samples, each sample represents a vector state, and 16-QAM has 16 states, and each 4-bit binary number specifies one of 16 states, namely/kloc-0.

See:/view/1137102.htm.