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16th International Conference on Digital Signal Processing

作者： Liu, Ligang Fukumoto, Masahiro Zhang, Shiyong Fudan Univ Sch Comp Sci Shanghai 200433 Peoples R China Kochi Univ Technol Dept Informat Syst Engn Kami Kochi 7828502 Japan

ISBN: (纸本)9781424432974

For a network canceler, whose input is mainly speech, the proportionate affine projection algorithm (PAPA) is expected to present faster convergence speed than the existing proportionate NLMS algorithms. However, the performance criteria of fast convergence speed conflicts with low steady-state misalignment when a constant step-size parameter is applied. In this article we introduce a variable step-size technique into the PAPA in order to achieve both fast convergence speed and low steady-state misalignment. Simulation results show that the proposed approach can greatly improve the steady-state misalignment without sacrificing the fast convergence speed of the PAPA.

关键词： Adaptive filter network echo cancellation proportionate adaptive algorithm affine projection algorithm variable step-size sparse impulse response

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Speech Enhancement Using affine projection algorithm in Subband

Speech Enhancement Using Affine Projection Algorithm in Subb...

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International Conference on Multimedia Computing and Systems

作者： Mahabadi, Ali Ameri Eshghi, Mohammad Shahid Beheshti Univ Dept Elect & Comp Engn Tehran Iran Shahid Beheshti Univ Fac Elect & Comp Engn Tehran Iran

ISBN: (纸本)9781424437566

In this paper, a novel structure is proposed in order to improve the functionality of Adaptive Noise Cancellers (ANC);for this purpose affine projection algorithm (APA) has been used. We exploit the Stationary Wavelet Transform (SWT) to decompose the input signals in subbnad to achieve a higher convergence rate. The reason of using SWT (an oversampled filter bank) is to reduce the effect of aliasing which produces some disturbance on the adaptive process. Since In the higher frequency subbands, there is no noticeable difference between APA and simpler approaches such as spectral subtraction or Wiener filter, these algorithms are substituted instead of APA for the sake of complexity. Simulation results show that the proposed ANC performance is better than the conventional ANC which uses adaptive algorithm in the time domain.. The results of subjective and objective tests confirm this fact.

关键词： affine projection algorithm spectral subtraction stationary wavelet transform wiener filter

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VARIABLE STEP SIZE DICHOTOMOUS COORDINATE DESCENT affine projection algorithm

VARIABLE STEP SIZE DICHOTOMOUS COORDINATE DESCENT AFFINE PRO...

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International IEEE Conference Devoted to the 150-Anniversary of Alexander S Popov

作者： Albu, Felix Paleologu, Constantin Benesty, Jacob Zakharov, Yuriy V. Univ Politehn Bucuresti Dept Telecommun Bucharest Romania

ISBN: (纸本)9781424439676

A new affine projection (AP) algorithm based on dichotomous coordinate descent (DCD) iterations has been recently proposed for acoustic echo cancellation (AEC). It uses a constant step size parameter and, therefore, has to compromise between fast convergence and tracking on the one hand, and low misadjustment and robustness to the presence and variations of a near-end signal on the other hand. In this paper we propose a variable step-size (VSS) version of the DCD-AP algorithm (VSS-DCD-AP) that does not require any a priori information about the acoustic environment. It is shown that the new algorithm is robust against near-end signal variations, including double-talk (DT).

关键词： dichotomous coordinate descent algorithm affine projection algorithm acoustic echo cancellation double-talk

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THERE'S PLENTY OF ROOM AT THE BOTTOM: INCREMENTAL COMBINATIONS OF SIGN-ERROR LMS FILTERS

THERE'S PLENTY OF ROOM AT THE BOTTOM: INCREMENTAL COMBINATIO...

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IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

作者： Chamon, Luiz F. O. Lopes, Cassio G. Univ Sao Paulo Dept Elect Syst Engn Signal Proc Lab BR-05508 Sao Paulo Brazil

ISBN: (纸本)9781479928934

The introduction of data reuse in the incremental topology made it possible for combinations of LMS filters to outperform algorithms such as the affine projection algorithm (APA) with lower complexity. This work poses and extends the concept of combinations as a complexity reduction technique by proposing an incremental combination of sign-error LMS filters that matches and even outperforms stand-alone LMS filters with reduced complexity. This combination is then analyzed and used as a building block in a larger combination that is able to match the APA at a reduced computational cost. Numerical simulations illustrate the performance of this novel combination in different scenarios.

关键词： Adaptive filtering Combination of adaptive filters Data reuse incremental combinations affine projection algorithm Sign-error LMS

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New Variable Step Size affine projection algorithms

New Variable Step Size Affine Projection Algorithms

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9th International Conference on Communications (COMM)

作者： Albu, Felix Paleologu, Constantin Ciochina, Silviu Valahia Univ Targoviste Fac Elect Engn Targoviste Romania Univ Politehn Bucuresti Dept TeleCommun Bucharest Romania

ISBN: (纸本)9781467325738

In this paper, we propose new variable step size affine projection algorithms whose step sizes are adjusted according to the square of a time-averaging estimate of the autocorrelation of a priori and a posteriori errors. The proposed algorithms have fast convergence, robustness against near-end signal variations (including double-talk) and do not require any a priori information about the acoustic environment. The simulation results indicate the good performance of the proposed algorithms when compared to similar algorithms.

关键词： adaptive filters affine projection algorithm variable step size echo cancellation

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An affine projection algorithm with a data-selective method of using the condition number

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SIGNAL PROCESSING 2008年第5期88卷 1289-1296页

作者： Lee, Chang Woo Lee, Young Kow Kim, Sang Woo Pohang Univ Sci & Technol Div Elect & Comp Engn Pohang 790784 Gyungbuk South Korea

This paper proposes a novel affine projection (AP) algorithm that offers a data-selective method using the condition number as a criterion for low misalignment. Capable of keeping the condition number of an input data matrix small, the proposed AP algorithm adopts a recently reported technique of E-norm. instead of L-2-norm to reduce the computational burden during the estimation of the condition number. The simulation results show that the proposed algorithm has a lower misalignment than the conventional algorithm in the steady state. (C) 2007 Elsevier B.V. All rights reserved.

关键词： affine projection algorithm condition number misalignment data-selective method

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Performance Evaluation of Adaptive Equalizers in EMFB-based Multicarrier Modulation Schemes

Performance Evaluation of Adaptive Equalizers in EMFB-based ...

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6th International Symposium on Telecommunications (IST) with Emphasis on Information and Communication Technology

作者： Baghersalimi, G. Zanj, B. Hadinia, M. Aqabarar, H. Univ Guilan Dept Elect Engn Rasht Iran

ISBN: (纸本)9781467320733

This work considers adaptive subchannel equalization in Exponentially-Modulated Filter Bank (EMFB) transmultiplexers (TMUX) when the channel is highly frequency selective. Using higher order sub-equalizers, improves the performance in this condition but convergence rate of adaptive algorithms decreases by increasing their order. Recently, Fine-Coarse (FC) algorithm was proposed for improving the convergence rate but evaluating the Bit Error Rate (BER) performance in realistic channels was addressed to future works. On the other hand, when the channel is highly frequency selective as it cannot be assumed flat over subcarrier bandwidth, the sub-equalizer input will be corrupted by colored spectrum. Therefore the use of affine projection algorithm (APA) that has robust performance even for highly colored excitation signals is proposed in this paper for such situations. The spectral property of sub-equalizer inputs will be studied. FC and APA algorithms are used as subchannel equalizers and compared with Normalized Least Mean Square (NLMS) algorithm in a frequency selective fading channel. Simulation results show that APA has better performance.

关键词： Multicarrier Modulation Equalization EMFB Fine-coarse Adaptive algorithm affine projection algorithm

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Optimal regularization parameter of the multichannel filtered-x affine projection algorithm

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IEEE TRANSACTIONS ON SIGNAL PROCESSING 2007年第10期55卷 4882-4895页

作者： Carini, Alberto Sicuranza, Giovanni L. Univ Urbino Informat Sci & Technol Inst I-61029 Urbino Italy Univ Trieste Dept Elect Elect & Comp Engn I-34127 Trieste Italy

We discuss the optimal regularization parameter of the Filtered-x affine projection (FX-AP) algorithm suitable for feedforward active noise control. While the original FX-AP algorithm always provides a biased estimate of the minimum-mean-square solution, we show that the optimal regularized FX-AP algorithm is capable to eliminate the bias of the asymptotic solution and thus that the regularization parameter can optimize both the convergence speed and the residual MSE of the algorithm. We derive some expressions for the optimal regularization parameter, and we discuss some heuristic estimations of the optimal regularization parameter in practical conditions.

关键词： active noise control affine projection algorithm multichannel adaptive filtering optimal regularization parameter

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A New Approach to Blind Multiuser Detection Based on affine projection algorithm

A New Approach to Blind Multiuser Detection Based on Affine ...

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3rd International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM 2007)

作者： Li, Hui Yu, Hongmei Zeng, Wei Northwestern Polytech Univ Dept Elect Engn Xian 710072 Peoples R China

ISBN: (纸本)9781424413119

The computational complexity of the blind adaptive multiuser detection algorithm with multipath fading channel is usually high. By combining Rake receiver and blind multiuser detection based on the affine projection algorithm (APA), an adaptive receiver which can be used in multipath fading channel is presented in this paper. As the APA can provide a good capability to tradeoff convergence speed and computational complexity, the proposed receiver has much improved convergence speed and tracking properties compared to the LMS-based receiver with much reduced computational cost compared to the one based on RLS algorithm, and also the new receiver is extremely near-far resistant. Simulation results are presented to compare our APA-based receiver with the blind LMS and RLS-based schemes and demonstrate the effectiveness of the proposed receiver.

关键词： affine projection algorithm DS/CDMA blind multiuser detection MAI

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PROPORTIONATE affine projection SIGN algorithmS FOR SPARSE SYSTEM IDENTIFICATION IN IMPULSIVE INTERFERENCE

PROPORTIONATE AFFINE PROJECTION SIGN ALGORITHMS FOR SPARSE S...

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IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Yang, Zengli Zheng, Yahong Rosa Grant, Steven L. Missouri Univ Sci & Technol Dept Elect & Comp Engn Rolla MO 65409 USA

ISBN: (纸本)9781457705397

Two proportionate affine projection sign algorithms (APSAs) are proposed for system identification applications, such as network echo cancellation (NEC), where the impulse response is often real-valued with sparse coefficients and long filter length. The proposed proportionate-type algorithms can achieve fast convergence and low steady-state misalignment by adopting a proportionate regularization matrix to the APSA. Benefiting from the characteristic of l(1)-norm algorithms, affine projection, and proportionate matrix, the new algorithms are robust to impulsive interferences and colored input, and achieve much faster convergence rate in sparse impulse responses than the original APSA, the normalized sign algorithm (NSA), and the proportionate least mean square (PNLMS) algorithm. The computational complexity of the new algorithms is lower than the affine projection algorithm (APA) family due to elimination of matrix inversion.

关键词： Adaptive filter network echo cancellation (NEC) proportionate adaptive algorithm affine projection algorithm sign algorithm

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