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利用ＣＤＭＡ用户在使用ＢＰＳＫ调制信号时的多径信道模型，根据ＰＮ码的特点先用最大似然（ＭＬ）法估计出信道的冲激响应矢量，再进一步估计出ＲＡＫＥ接收机所需的各多径时延和衰减系数等参数，分析和计算结果表明，此方法具有速度快，计算量小和精度高等优点．针对信道参数的瞬时变化，采用扩展Ｋａｌｍａｎ滤波器（ＥＫＦ）同时对各多径时延和衰减系数等参数进行跟踪，分析和计算结果也表明，这种跟踪方法精度较高，结构又比较简单，因而具有一定的实用价值．
According to the characteristics of PN code, the maximum impulse (ML) method is used to estimate the impulse response vector of the channel by using the multipath channel model of CDMA users when using BPSK modulated signal, and then the multi-path model of RAKE receiver is further estimated Diameter delay and attenuation coefficient. The results of analysis and calculation show that this method has the advantages of fast speed, small amount of calculation and high accuracy. According to the instantaneous changes of channel parameters, extended Kalman filter (EKF) is used to track parameters such as multipath delay and attenuation coefficient simultaneously. The analysis and calculation results also show that this tracking method has higher accuracy and simpler structure, Which has a certain practical value.