此函数用于IS-95前向链路系统的仿真，包括扩 频调制，匹配滤波，RAKE接收等相关通信模块。 仿真环境: 加性高斯白噪声信道. 数据速率 = 9600 KBps - This function is used in IS-95 forward link system simulation, including the expansion frequency modulation, matched filter, RAKE receiver and oth