说明：  ％BPSK载波调制信号的生成及其频谱分析 ％输入：数据率/仿真时间/中频载波频率/系统采样率 ％输出：BPSK信号的时域波形及其频谱
( BPSK modulation signal generation and spectrum analysis Input: data rate/simulation time/IF carrier frequency/system output sampling rate: BPSK signals in time-domain waveform and its spectrum)