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A comparative study of two blind FIR equalizers

DIGITAL SIGNAL PROCESSING 2004年第1期14卷 18-36页

作者： Chen, S Cook, TB Anderson, LC Univ Southampton Dept Elect & Comp Sci Southampton SO17 1BJ Hants England

The paper investigates blind tinite-impulse-response (FIR) equalization schemes for quadrature amplitude modulation signalling. We compare a bootstrap maximum a posteriori probability (MAP) equalizer witha recently introduced concurrent constant modulus algorithm (CMA) and decision directed (DD) equalizer (CMA+DD). Both equalizers are known to outperform the CMA considerably in the situations where carrier recovery is performed and the signal constellation is known. The concurrent CMA+DD equalizer has a complexity that is slightly more than twice of the CMA, and the bootstrap MAP equalizer has computational requirements that are only slightly more complex than the CMA. Simulation results indicate that the bootstrap MAP blind FIR equalizer has a faster convergence rate and better steady-state performance than the concurrent CMA+DD blind FIR equalizer, but tuning of the former is more complicated than the latter. (C) 2003 Elsevier Inc. All rights reserved.

关键词： blind equalization finite-impulse-response filter quadrature amplitude modulation constant modulus algorithm decision-directed adaptation maximum a posteriori probability

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Quantized CMA equalization for shaped signal constellations

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IEEE SIGNAL PROCESSING LETTERS 2004年第2期11卷 67-70页

作者： Athuraliya, SA Garth, LM Univ Canterbury Dept Elect & Comp Engn Christchurch 1 New Zealand

Constellation shaping introduced to maximize channel capacity is detrimental to the performance of many cost function-based blind equalization algorithms including the constant modulus algorithm (CMA). We propose a new multi-modulus algorithm closely related to CMA, but robust against changes in the statistical nature of the signal due to constellation shaping. While CMA behaves properly only for sub-Gaussian distributions, the algorithm we develop is applicable to a broad class of distributions including Gaussian and super-Gaussian.

关键词： blind equalization constant modulus algorithm shaped constellation shell mapping

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A Novel constant modulus Array for Multiuser Detection

A Novel Constant Modulus Array for Multiuser Detection

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第七届国际信号处理会议

作者： ZHANG Ji-dong 1 ZHENG Bao-yu 2 Fu Hong-liang2 (1: ShangHai JiaoTong University , Shanghai China 200030 2:NanJing University of Posts and Telecommunications NanJing China 21000

A novel multitarget constant modulus array structure is proposed for CDMA systems in this paper. The new algorithm for the structure is called pre- despreading and wavelet denoising constant modulu

关键词： constant modulus algorithm Wavelet denoising Multiuser detection Communication signal processing

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A new parallel algorithm for fractionally spaced equalization

A new parallel algorithm for fractionally spaced equalizatio...

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International Conference on Communications, Circuits and Systems

作者： Deng, YJ Yang, ZX Guo, XB Tsinghua Univ Dept Elect Engn State Key Lab Microwave & Digital Commun Beijing 100084 Peoples R China

ISBN: (纸本)0780386477

Due to some drawbacks such as instability of the analog receiver in wideband conditions, all-digital parallel receiver (APRX) has become more and more attractive. Based on the structure of an APRX, which is presented in Telecommunications and Data Acquisition (TDA) progress report of Jet Propulsion Laboratory (JPL), a novel parallel algorithm for fractionally spaced equalization (PFSE) is proposed. Utilizing the constant modulus algorithm (CMA), PFSE takes best advantage of its data overlapping characteristic and achieves perfect combination with the APRX's structure. Simulation results show that the performance of PFSE obviously predominates that of the T-Spaced Equalizer, with hardly any loss of performance compared with the corresponding serial FSE.

关键词： all-digital parallel receiver constant modulus algorithm digital microwave communications parallel fractionally spaced equalizer

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Sign kurtosis maximization based blind equalization algorithm

Sign kurtosis maximization based blind equalization algorith...

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8th International Conference on Control, Automation, Robotics and Vision (ICARCV 2004)

作者： Guo, YC Zhao, JW Sun, YQ Anhui Univ Sci & Technol Dept Elect Engn Huainan 232001 Peoples R China

ISBN: (纸本)0780386531

For greatly overcoming disadvantages of low convergent rate and high mean square error of constant modulus algorithm(CMA) and defects of high computational complexity of polyspectra algorithms, sign kurtosis maximization adaptive algorithm (SKMAA) for updating blind equalizer weight vectors is developed based on kurtosis of stochastic signals, the stochastic ascend approach, and sign algorithm. In this algorithm, the sign of the equalizer output signal function is extracted and used as the updating factor of equalizer weight vectors to decrease the computational load of updating blind equalizer weight vectors. Accordingly, performance of the SKMAA in convergent speed and residual mean square error (MSE) is much better than that of CMA. The efficiency of SKMAA is proved via computer simulation of the underwater acoustic channel (UWAC) equalization.

关键词： blind equalisers optimisation adaptive systems communication complexity stochastic processes signal processing convergence mean square error methods blind equalization algorithm constant modulus algorithm computational complexity polyspectra algorithms sign kurtosis maximization adaptive algorithm blind equalizer weight vectors stochastic signals stochastic ascend approach residual mean square error underwater acoustic channel equalization

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Blind search for optimal Wiener equalizers using an artificial immune network model

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EURASIP JOURNAL ON APPLIED SIGNAL PROCESSING 2003年第8期2003卷 740-747页

作者： Attux, RRD Loiola, MB Suyama, R de Castro, LN Von Zuben, FJ Romano, JMT Univ Estadual Campinas DSPCOM DECOM BR-13083970 Campinas SP Brazil Univ Estadual Campinas DCA FEEC BR-13083970 Campinas SP Brazil

This work proposes a framework to determine the optimal Wiener equalizer by using an artificial immune network model together with the constant modulus (CM) cost function. This study was primarily motivated by recent theoretical results concerning the CM criterion and its relation to the Wiener approach. The proposed immune-based technique was tested under different channel models and filter orders, and benchmarked against a procedure using a genetic algorithm with niching. The results demonstrated that the proposed strategy has a clear superiority when compared with the more traditional technique. The proposed algorithm presents interesting features from the perspective of multimodal search, being capable of determining the optimal Wiener equalizer in most runs for all tested channels.

关键词： blind equalization constant modulus algorithm evolutionary computation artificial immune systems immune network model

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constant modulus algorithm for multiuser detection

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CHINESE JOURNAL OF ELECTRONICS 2000年第2期9卷 163-165页

作者： Wang, Y Zhao, JP Wu, WL Beijing Univ Posts & Telecommun Beijing 100876 Peoples R China

constant modulus algorithm (CMA) for blind multiuser detection is proposed in [3]. However, the first type of stationary points in [3] is not correct. A general expression for the solutions is given in this paper, which shows there are many undesired stationary points. Therefore, methods that guarantee CMA to converge to the desired point are needed. We present approximate conditions that set initialization in the lock region. Simulation shows that CMA with variable step size has quicker convergence speed than MOE-RLS, while obtaining better performance.

关键词： Code-Division Multiple-Access multiuser detection constant modulus algorithm

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Multiuser interference suppression using block Shanno constant modulus algorithm

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IEEE TRANSACTIONS ON SIGNAL PROCESSING 2000年第5期48卷 1503-1506页

作者： Jani, UG Dowling, EM Golden, RM Wang, ZF Univ Texas Erik Jonsson Sch Engn & Comp Sci Richardson TX 75083 USA

In this correspondence, we extend the results from Wang and Dowling to provide a low-cost and high performance blind adaptive interference suppression scheme for CDMA systems. Simulation results confirm that the proposed algorithm outperforms several existing algorithms, even under the most severe cases of near-far and multipath conditions.

关键词： adaptive filters blind equalization CDMA conjugate gradient algorithms constant modulus algorithm interference suppression multiuser detection wireless

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A fast constant modulus algorithm for blind equalization

A fast constant modulus algorithm for blind equalization

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34th Asilomar Conference on Signals, Systems, and Computers

作者： Nelatury, SR Rao, SS Villanova Univ Dept Elect & Comp Engn Villanova PA 19085 USA

ISBN: (纸本)0780365143

The constant modulus (CM) criterion coupled with a gradient search helps in the design of fractionally spaced equalizers. Effective implementation of CIM algorithm requires proper choice of the scale factor mu called the step size and initialization of equalizer coefficients. Experience reveals that these two determine the convergence rate and final misadjustment. Recently Brown et al proposed a computationally efficient algorithm, which is a signed error version of CMA. This paper proposes yet another variation of the same and reports faster convergence. The idea is to use a variable step size, which increases the convergence rare.

关键词： blind equalization constant modulus algorithm error function speed of convergence

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The JADE-estimated CM array for correlated cochannel signal recovery

The JADE-estimated CM array for correlated cochannel signal ...

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58th IEEE Vehicular Technology Conference (VTC 2003)

作者： Pirak, C Jitapunkul, S Chulalongkorn Univ Dept Elect Engn Bangkok Thailand

ISBN: (纸本)0780379543

This paper proposed to use the Joint Approximate Diagonalisation of Eigen Matrices (JADE) algorithm for the cascade multistage constant modulus (CM) array in order to recover correlated cochannel signals in the multipath environment. The JADE algorithm was need as the initial-weight estimator. Furthermore, we propose a concept to compromise between the high computational complexity of the JADE algorithm and the degradation of the signal-captured performance of the cascade multistage CM array as well. The experimental results show that this scheme has the signal-captured performance close to MVDR array technique, which is the best, in comparison with our proposed scheme, and the original cascade multistage CM array.

关键词： constant modulus algorithm smart antenna blind array processing JADE algorithm

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