说明：  仿真高斯白噪声信道下QPSK的Eb/N0与误比特率之间的关系。 要求： 任选一种工具进行仿真：SPW、Matlab、Simulink。 成型滤波器采用根升余弦滚降滤波器，滚降系数为0.5，过采样因子为4 要求仿真至1e-5误比特率 。 与理论值对比，绘出对比曲线
(Simulation of Gauss white noise channel QPSK between Eb/N0 and bit error rate of the relationship. Requirement. Optionally, a tool for simulation: SPW, Matlab, Simulink. Shaping filter using the root raised cosine filter, roll off factor of 0.5, over sampling factor of 4 Requirements of simulation to 1e-5 bit error rate. Compared with the theoretical value, draw the contrast curve)