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document_text01 " 首先在发射端产生一组数据，经过编码和扩"
"频调制后形成一组发送信号，将这组信号通过一瑞利+高斯白噪声信道。
\n 在接收端"
"使用所设计的RAKE接收机接收，通过计算接收数据的误码率来估计RAKE接收机的性能。
"
"\n RAKE接收机设计的主要参数为：
\n 符号宽度为：Tb=0.0001，处理增益为：PG="
"16，码片的宽度为：Tc=Tb/PG，
\n 多普勒频移为：fd=50，接收信噪比为db=10，调"
"制方式为：pi/4-QPSK，处理延时为：Drake=2，
\n 叉指数为：M=4，路径为：0 1 2 "
"3， 路径延时分别为： 0.25， 0.25， 0.25， 0.25。
\n"
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