如今，大多数无线服务都在使用复杂的载波调制方案。调制技术和元器件的持续改进以及纠错码的进步，促使信道容量更加接近香农定理设定的基础极限。那么，调制是什么意思？调制的分类？ 调制是一种将需要传送的信号搬移到高频载波，实现频谱搬移的过程。

Quadrature Amplitude Modulation (QAM) has been a fundamental component in the evolution of mobile connectivity. As the demand for faster data speeds and more efficient network utilization continues to ...

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Half the bits are represented on the real axis and half the bits are represented on the imaginary axis. The in-phase and quadrature signals are independent level Pulse Amplitude Modulation (PAM) ...