The method of optimal parametric feedforward estimation of fading channels, which is used in TDMA systems originally, is modified to cope with matrix singularity because the number of pilot signals is small in WCDMA systems.

• 在衰落信道最优前馈参数估计的方法中，原方法是针对TDMA系统。 当应用于WCDMA系统时，因为WCDMA系统的导频信号数远远少于TDMA系统的导频信号数，所以在用最小二乘方法估计信道时，无法满足导频信号数大于两倍多径数的条件，导致矩阵不可逆。