从调制解调原理出发，通过MATLAB仿真较为全面地分析了16QAM和64QAM这两种基带调制解调技术，比较了它们之间的区别，并研究了高斯和瑞利信道的理论特征、产生过程以及对通信信道的影响，讨论了QAM经过高斯和瑞利信道后的误码情况，分析了这两种QAM在同样信道路条件下的误码率，总结了QAM调制过程中的相关技术，可为今后应用更高阶QAM调制方式提供理论参考。%According to modulation and demodulation theory, using MATLAB simulation, the baseband modulation and demodulation technology of 16QAM and 64QAM(quadrature amplitude modulation) are thoroughly analyzed. By comparing their differences, the theory characteristics, production process as well as the impact on the communication channel of Gaussian and Rayleigh channel are researched. In the meantime, the bit error of QAM after passing Gaussian and Rayleigh channel are discussed, the BER(bit error rate) performances of 16 QAM and 64 QAM under same channel condition are analyzed , as well as the relative technology on QAM modulation is summarized, which provides theoretic reference for higher order QAM modulation mode in the future application.
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