【摘要】 我国三网融合中的视频信号采用正交振幅调制QAM(Quadrature Amplitude Modulation)作为信号调制方式,国产64QAM信号源与检测设备距离国际一流水平在精度和稳定性方面还有较大差距,本论文主要分析了QAM方式,建立了QAM调制仿真模型,分析并仿真了QAM信道的重要参数对MER值的影响,并分别进行了实验测量,观察到仿真结果与测量结果拟合度较好,同时分析了各组差异的原因,最终量化的各个参数分别与MER值的对应关系得到证实。更多还原

【Abstract】 The video signal of China’s triple play uses quadrature amplitude modulation as the signal, domestic 64 QAM signal source and testing equipment from the international first-class level in terms of accuracy and stability, there is a big gap modulation. In this paper, the QAM method is analyzed and the QAM modulation simulation model is established. The influence of the important parameters of the QAM channel on the MER is simulated and analyzed, and the experimental measurements are made. The simulation results are observed with the measurement results fit better, and analyzes the reasons for differences in each group. The individual parameters of the final quantization values corresponding to the relationship between MER are confirmed.更多还原