仿真练习（第六次刘课件中有关于噪声的添加方法）



？ 编写一个含QAM传输的发送和接收模块



？ 分别采用复基带仿真和实带通仿真两种形式



？ 复基带仿真时过采样率为4倍,实带通仿真时过采样率为20倍, 实带通仿真时, 载波频率为符号率的4倍



？ 发端采用滚降系数0.5的根号升余弦滤波器



？ 画出Eb/N0=15dB时的接收波形(收滤波前),取100个采样



？ 画出发端输出的眼图和收端过匹配滤波后的眼图(画眼图时不加噪声)



？ 统计误符号率和误比特率与Eb/N0的关系,画出曲线, 与理论计算的曲线相对比-Simulation exercises about noise (sixth Liu courseware Add method)



? Preparation of the one containing the transmission and reception of QAM transmission module



? Complex baseband simulation and real bandpass simulation were used in two forms



? When the simulation of the complex baseband oversampling rate 4 times, real bandpass simulation over-sampling rate of 20 times the real bandpass simulation, the carrier frequency is 4 times the symbol rate



? Originator using the square root raised cosine filter roll-off factor of 0.5



? Draw Eb/N0 = 15dB received waveform (received before filtering), take the 100 samples



? Draw originator output eye diagram and eye diagram after the receiving end matched filtering plus noise (painted eye diagram)



? Statistics symbol error rate and bit error rate and Eb/N0 relationship, draw curves, and compared with the theoretical calculation of the curve