说明：  针对此,笔者详细介绍了16QAM差分 调制解调的原理,并通过接收端解码电路相应的运算规则消除了频偏和相偏的影响,免除了复杂的 载波和相位同步,降低了QAM接收机的复杂度。
(For this, the author describes the detail of the principle of 16QAM differential modulation and demodulation, and by eliminating the frequency deviation and phase deviation of the receiving end corresponding to the decoding circuit of the arithmetic rule, eliminating the complexity of the carrier and phase synchronization, and reduces the QAM receiver complexity.)