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作者： Kar, A. Brno University of Technology

In this research an advance variable structure adaptive Multiple Sub-Filters (MSF) based algorithm for single channel Acoustic Echo Cancellation (AEC) is proposed and analyzed. This work suggests a new and improved direction to find the optimum tap-length of adaptive filter employed for AEC. The structure adaptation, supported by a tap-length based weight update approach helps the designed echo canceller to maintain a trade-off between the Mean Square Error (MSE) and time taken to attain the steady state MSE. The work done in this paper focuses on replacing the fixed length sub-filters in existing MSF based AEC algorithms which brings refinements in terms of convergence, steady state error and tracking over the single long filter, different error and common error algorithms. A dynamic structure selective coefficient update approach to reduce the structural and computational cost of adaptive design is discussed in context with the proposed algorithm. Simulated results reveal a comparative performance analysis over proposed variable structure multiple sub-filters designs and existing fixed tap-length sub-filters based acoustic echo cancellers.

关键词： Adaptive filter acoustic echo cancellation variable structure design multiple sub-filters least mean square mean square error convergence.

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A robust MRAC using variable structure design for multivariable plants

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AUTOMATICA 1996年第6期32卷 833-848页

作者： Chien, CJ Sun, KC Wu, AC Fu, LC NATL TAIWAN UNIV DEPT ELECT ENGNTAIPEITAIWAN

It is well known that undesirable transient responses and tracking performances have been frequently observed in traditional model reference adaptive control (MRAC) problems, especially for multivariable plants with unmodeled dynamics and output disturbances. In this paper, a new robust model reference adaptive control using variable structure design (VSD) is proposed to investigate the solution. Based on a definition of generalized relative degree (GRD) for multivariable plants, the general case for plants with arbitrary GRD is completely solved. It is shown that, even when the uncertainties are presnet, global stability and robustness of the closed-loop control system are achieved. Furthermore, without any persistence of excitation, the tracking errors will, at least asymptotically, converge to zero for GRD-one plants and to a small residual set for plants with any higher GRD. With a suitable choice of initial control parameters, the tracking errors can even be driven to zero in finite time for GRD-one plants and to a small residual set exponentially for plants with any higher GRD. Copyright (C) 1996 Elsevier Science Ltd.

关键词： robustness model reference adaptive control multivariable plants arbitrary generalized relative degree variable structure design

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A NEW ROBUST MODEL-REFERENCE CONTROL WITH IMPROVED PERFORMANCE FOR A CLASS OF MULTIvariable UNKNOWN PLANTS

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INTERNATIONAL JOURNAL OF ADAPTIVE CONTROL AND SIGNAL PROCESSING 1992年第2期6卷 69-93页

作者： CHIEN, CJ FU, LC NATL TAIWAN UNIV DEPT ELECT ENGNTAIPEITAIWAN NATL TAIWAN UNIV DEPT COMP SCI & INFORMAT ENGNTAIPEITAIWAN

Motivated by recent works on parametrization of multivariable plants for model reference adaptive control (MRAC), a new robust model reference control (MRC) scheme for a class of multivariable unknown plants is presented. The salient feature of this control scheme is the improved performance of the output-tracking property, which is hardly attainable by the traditional MRAC schemes. The controller here is devised using the concept of variable structure design which prevails in the robust control context. It is shown by a Lyapunov approach that without any persistent excitation the global stability of the overall system is achieved and the tracking errors will converge to a residual set. The size of that set can be directly related to the size of unmodelled dynamics and output disturbances explicitly as long as a set of control parameters is chosen properly (large).

关键词： MODEL REFERENCE CONTROL MULTIvariable UNKNOWN PLANTS GENERALIZED RELATIVE DEGREE variable structure design

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A NEW APPROACH TO MODEL-REFERENCE CONTROL FOR A CLASS OF ARBITRARILY FAST TIME-VARYING UNKNOWN PLANTS

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AUTOMATICA 1992年第2期28卷 437-440页

作者： CHIEN, CJ FU, LC NATL TAIWAN UNIV DEPT COMP SCI & INFORMAT ENGNTAIPEITAIWAN

In this note, a new standard model reference control (NSMRC) to arbitrarily fast linear single-input single-output time-varying plants with relative degree one is presented. A modified version of standard model reference control (SMRC) structure is developed which incorporates the concept of variable structure design and null adaptation process for fast time-varying plants. It is shown that the output error will converge to zero in finite time without any restriction on the time-varying rate of the plant parameters while all signals inside the closed-loop system remain uniformly bounded so long as some design parameters are chosen properly (large). Superior transient responses as well as convergence properties can be observed from the simulation results provided.

关键词： MODEL REFERENCE CONTROL LINEAR FAST TIME-VARYING variable structure design

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