说明：  以2^10个二进制PRBS作为消息码，载波频率为2.4GHz，画出QPSK调制波形的频谱图和 星座图，其中码元速率为5MBaud/s.源码可直接使用。
(With PRBS 2 ^ 10 binary code as a message carrier frequency of 2.4GHz, spectrum QPSK modulation waveform drawing and constellation in which the symbol rate is 5MBaud/s. Source code can be used directly.)