关键词: 仿射投影算法, 变阶, 收敛速度, 稳态失调

Abstract: Via changing the condition of the Affine Projection Algorithm（APA） , a new APA evolving order is proposed by letting the posteriori error be equal to the system noise. The order of the proposed algorithm is proportional to the ratio between the square of L2 norm of the error vector and system noise power. And the scale factor can be adjusted by the regularization factor. The order is large at the beginning and small when the algorithm has converged. Simulation shows that the proposed algorithm has fast convergence rate, low steady state misalignment and computational complexity.

Key words: Affine Projection Algorithm（APA）, variable order, convergence speed, steady state misalignment