scholarly journals A Filtered-x Affine Projection Sign Algorithm with Improved Convergence Rate for Active Impulsive Noise Control

2015 ◽  
Vol 34 (2) ◽  
pp. 130
Author(s):  
Lee
Keyword(s):  
Convergence Rate ◽  
Noise Control ◽  
Impulsive Noise ◽  
Affine Projection ◽  
Sign Algorithm

scholarly journals ℒp-Norm-like Affine Projection Sign Algorithm for Sparse System to Ensure Robustness against Impulsive Noise

Symmetry ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1916
Author(s):  
Jaewook Shin ◽  
Jeesu Kim ◽  
Tae-Kyoung Kim ◽  
Jinwoo Yoo
Keyword(s):  
Convergence Rate ◽  
Impulsive Noise ◽  
Affine Projection ◽  
Filter Performance ◽  
Norm Minimization ◽  
Sparse System ◽  
Impulsive Noises ◽  
Sparse Systems ◽  
Sparse System Identification ◽  
Sign Algorithm

An improved affine projection sign algorithm (APSA) was developed herein using a ℒp-norm-like constraint to increase the convergence rate in sparse systems. The proposed APSA is robust against impulsive noise because APSA-type algorithms are generally based on the ℒ1-norm minimization of error signals. Moreover, the proposed algorithm can enhance the filter performance in terms of the convergence rate due to the implementation of the ℒp-norm-like constraint in sparse systems. Since a novel cost function of the proposed APSA was designed for maintaining the similar form of the original APSA, these have symmetric properties. According to the simulation results, the proposed APSA effectively enhances the filter performance in terms of the convergence rate of sparse system identification in the presence of impulsive noises compared to that achieved using the existing APSA-type algorithms.

scholarly journals Grid-Tied Distribution Static Synchronous Compensator for Power Quality Enhancement Using Combined-Step-Size Real-Coefficient Improved Proportionate Affine Projection Sign Algorithm

Energies ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 197
Author(s):  
Arobinda Dash ◽  
Durgesh Prasad Bagarty ◽  
Prakash Kumar Hota ◽  
Manoj Kumar Sahu ◽  
Twinkle Hazra ◽  
...  
Keyword(s):  
Steady State ◽  
Convergence Rate ◽  
Adaptive Filter ◽  
Reactive Power ◽  
Real Coefficient ◽  
Step Size ◽  
Static Synchronous Compensator ◽  
Affine Projection ◽  
Three Phase ◽  
Sign Algorithm

A control structure design of a three-phase three-leg four-wire grid-tied Distribution Static Synchronous Compensator (DSTATCOM) based on a combined-step-size real-coefficient improved proportionate affine projection sign algorithm (CSS-RIP-APSA) has been presented. The three-phase four-wire DSTATCOM is used for reactive power compensation along with harmonic current minimization. This strategy also helps in load balancing and neutral current compensation. The affine projection sign algorithm (APSA) is a member of the adaptive filter family, which has a slow convergence rate. The conventional adaptive filter deals with the trade-off between the convergence rate and the steady-state error. In the proposed algorithm, the RIP-APSA adaptive filter with two different step sizes has been designed to decrease the computational burden while achieving the advantages of a fast convergence rate and reduced steady-state error. The proposed controller also makes the inverter function a shunt compensator. The controller primarily evaluates the fundamental weight component of distorted load currents. The aim of the proposed system is to compensate for reactive power and to ensure unity power factor during the faulty conditions as well as for unbalancing grid conditions. The proposed control algorithm of the grid-tied DSTATCOM works effectively on the laboratory prototype as verified from the experimental results.

scholarly journals Modified Filtered-X Hierarchical LMS Algorithm with Sequential Partial Updates for Active Noise Control

2020 ◽  
Vol 11 (1) ◽  
pp. 344
Author(s):  
Pedro Ramos Lorente ◽  
Raúl Martín Ferrer ◽  
Fernando Arranz Martínez ◽  
Guillermo Palacios-Navarro
Keyword(s):  
Computational Complexity ◽  
Convergence Rate ◽  
Noise Control ◽  
Active Noise Control ◽  
Adaptive Strategy ◽  
Lms Algorithm ◽  
Step Size ◽  
Periodic Disturbances ◽  
Active Noise ◽  
Dependent Parameter

In the field of active noise control (ANC), a popular method is the modified filtered-x LMS algorithm. However, it has two drawbacks: its computational complexity higher than that of the conventional FxLMS, and its convergence rate that could still be improved. Therefore, we propose an adaptive strategy which aims at speeding up the convergence rate of an ANC system dealing with periodic disturbances. This algorithm consists in combining the organization of the filter weights in a hierarchy of subfilters of shorter length and their sequential partial updates (PU). Our contribution is threefold: (1) we provide the theoretical basis of the existence of a frequency-dependent parameter, called gain in step-size. (2) The theoretical upper bound of the step-size is compared with the limit obtained from simulations. (3) Additional experiments show that this strategy results in a fast algorithm with a computational complexity close to that of the conventional FxLMS.

Experimental Study on Enhanced FXLMS Algorithm for Active Impulsive Noise Control

2013 ◽  
Vol 6 (2) ◽  
pp. 514-519 ◽  
Author(s):  
Guohua Sun ◽  
Mingfeng Li ◽  
Teik C. Lim ◽  
Ming-Ran Lee ◽  
Ming Cheng ◽  
...  
Keyword(s):  
Experimental Study ◽  
Noise Control ◽  
Impulsive Noise ◽  
Fxlms Algorithm

An active impulsive noise control algorithm with self-p-normalized method

2022 ◽  
Vol 186 ◽  
pp. 108428
Author(s):  
Feng Pengxing ◽  
Zhang Lijun ◽  
Meng Dejian ◽  
Pi Xiongfei
Keyword(s):  
Control Algorithm ◽  
Noise Control ◽  
Impulsive Noise
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