可变遗忘因子的PASTd算法

his paper focuses on PASTd algorithm.The complexity of this algorithm is much lower than the PAST algorithm's, but its convergence rate is slower. Matlab simulation shows that PASTd algorithm's vector tracking error and convergence rate are interrelated with the forgetting factor. When the forgetting factor is small, its vector tracking error is large and its convergence rate is fast; when the forgetting factor is large, its vector tracking error is small and its convergence rate is slow. So this article defines a variable forgetting factor ,it can reduce the vector tracking error and accelerate the speed of convergence .When the channel is mutated, it can quickly find a suitable forgetting factor.