SHI Li-ming, LIN Yun. Variable Regularization Parameter for Affine Projection Algorithm Based on Energy of the Noise-Free a Posterior Error Vector Signal[J]. Acta Electronica Sinica, 2015, 43(1): 7-12.
SHI Li-ming, LIN Yun. Variable Regularization Parameter for Affine Projection Algorithm Based on Energy of the Noise-Free a Posterior Error Vector Signal[J]. Acta Electronica Sinica, 2015, 43(1): 7-12. DOI: 10.3969/j.issn.0372-2112.2015.01.002.
Variable regularization (VR) parameter technique is an important method to improve the tracking performance of affine projection adaptive filtering algorithm.Existing VR algorithms suffer from environmental noise and estimation errors
making it slow to converge and have a large steady-state error.Based on the analysis of the relationships between noise-free a priori error vector
noise-free a posterior error vector and excess mean-square error
a novel VR method via minimizing energy of the noise-free a posterior error vector is proposed to improve the tracking performance.The statistical variance of the measurement noise and a smoother and more easily-controlled exponential scaling factor estimation method are used for practical implementation.Reduced steady-state misalignment and improved convergence speed as compared to conventional algorithms are demonstrated by simulations in system identification scenarios.