通用调制解调程序，主要包括BPSK, QPSK, 64QAM, 64QAM等常用调制方式。

三种模拟调制与解调的算法，三种模拟调制为：AM，FM，SSB,Three types of analog modulation and demodulation algorithms, three types of analog modulation for: AM, FM, SSB

该源码可实现16QAM的调制解调功能，包括串并转换、二/四进制变换，并完成相干解调。给出信噪比与误码率关系仿真结果。通过输出星座图的形式直观的观察调制解调性能-The source can be realized 16QAM modulation and demodulation, including string and conversion, two/quaternary conversion and complete coherent demodulation. Given the rel