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PERFORMANCE OF constant modulus ADAPTIVE DIGITAL-FILTERS FOR INTERFERENCE CANCELLATION

SIGNAL PROCESSING 1992年第2期26卷 185-196页

作者： KWON, OW UN, CK LEE, JC Communications Research Laboratory Department of Electrical Engineering Korea Advanced Institute of Science and Technology P.O. Box 150 Chongyangni Seoul Korea

The constant modulus algorithm (CMA) updates its weight vector to minimize the modulus variation of the output signal. In this paper, the convergence behavior of the CMA used in interference cancellation application is studied. We first investigate the optimum weight vector that minimizes the performance index of the CMA which is defined as the mean-squared difference between the estimated and true moduli. We then analyze the convergence behavior of the squared output modulus and the performance index. Based on these analysis results, several convergence properties of the CMA are discussed.

关键词： constant modulus algorithm CMA ADAPTIVE DIGITAL FILTER INTERFERENCE CANCELLATION

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Learning strategies for adaptive equalizers using the constant modulus error criterion

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INTERNATIONAL JOURNAL OF ADAPTIVE CONTROL AND SIGNAL PROCESSING 1998年第2期12卷 97-116页

作者： Soni, RA Schirtzinger, TA Jenkins, WK Univ Illinois Dept Elect & Comp Engn Urbana IL 61801 USA Univ Illinois Coordinated Sci Lab Urbana IL 61801 USA

In communication systems, data are often corrupted during transmission due to imperfect communication channels. Since channel characteristics may be time varying or unknown prior to data transmission, adaptive equalizers are typically incorporated into the receiver to reduce the ill effects of the imperfect channel. Conventional equalizers utilize a training signal to achieve the proper correction. Blind equalization schemes do not require the use of a training signal, but instead attempt restoration based upon some known property of the transmitted signal. The constant modulus algorithm (CMA) is a blind equalization technique that may be used to equalize certain communication signals (e.g. BPSK, QPSK, and FM). This paper investigates three new techniques for adaptive equalization based on the constant modulus error criterion: (i) the fast quasi-Newton CMA, (ii) the conjugate gradient quasi-Newton CMA, (iii) the conjugate gradient CMA. These three methods are formulated analytically and evaluated experimentally on several typical communication channel models. (C) 1998 John Wiley & Sons, Ltd.

关键词： adaptive channel equalization blind equalization conjugate gradient algorithm constant modulus algorithm fast quasi-Newton CMA algorithm LMS algorithm

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Fast converging approach for blind constant modulus interference suppression

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JOURNAL OF THE CHINESE INSTITUTE OF ENGINEERS 2004年第2期27卷 275-279页

作者： Chang, AC Huang, ZF Natl Def Univ Chung Cheng Inst Technol Dept Elect Engn Taoyuan 335 Taiwan

The convergence behavior of the constant modulus algorithm (CMA) is examined in the proper initialization condition of locking onto the desired signal. An improved CMA converging approach is proposed that has the advantage of suppressing multiple access interference without explicit knowledge of interference parameters for synchronous DS-CDMA systems. Simulation results demonstrate that the method overcomes the slower convergence of the CMA in the sudden birth of the number of users and outperforms the CMA detector and matched filter.

关键词： CDMA constant modulus algorithm speed of convergence blind adaptive interference suppression

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Improvement for solving the mix-up problem in constant modulus arrays

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ELECTRONICS LETTERS 1999年第25期35卷 2161-2163页

作者： Volani, K constantinides, AG Univ London Imperial Coll Sci Technol & Med Dept Elect & Elect Engn London SW7 2BT England

The authors propose an efficient and computationally fast algorithm for solving the mix-up problem in complex arrays. The Lagrange multiplier theory is used in the optimisation of the constant modulus algorithm (CMA) cost function and the input data are processed in blocks. Furthermore, a simplification of the CMA cost function is proposed that leads to a robust algorithm for solving this problem. Simulations are presented to support the analysis.

关键词： mix-up problem Communication channel equalisation and identification QAM array signal processing quadrature amplitude modulation cost function blind adaptive equalisers blind equalisers adaptive equalisers constant modulus arrays Lagrange multiplier theory Signal processing and detection constant modulus algorithm robust algorithm CMA cost function

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LOW COMPLEXITY constant modulus BASED CYCLIC BLIND ADAPTIVE MULTIUSER DETECTION

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SAIEE AFRICA RESEARCH JOURNAL 2006年第2期97卷 112-119页

作者： Whitehead, J. B. Takawira, F. Eskom Resources & Strategy CR&D Private Bag 40175 ZA-2022 Cleveland South Africa Univ KwaZulu Natal Sch Elect Elect & Comp Engn ZA-4041 Durban South Africa

Periodically time varying (PTV) filters can offer significant performance gains over conventional filtering methods in DS-CDMA communications systems that are either multirate or corrupted by narrow band interference. This paper develops a new blind adaptive PTV linear multiuser detector based on the frequency shift (FRESH) architecture. The blind adaptive algorithm is based on the linearly constrained constant modulus algorithm (LCCMA), but is modified for the FRESH architecture. The resulting stochastic gradient algorithm has significantly less computational complexity than the recently proposed recursive and cyclic subspace tracking algorithms, and can offer comparable performance. The robustness of the FRESH-LCCMA algorithm is ensured through a proof of convergence which is carried out in the paper.

关键词： Blind adaptive multiuser detection constant modulus algorithm cyclic algorithms DS-CDMA frequency shift filtering multi-rate CDM

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constant modulus BEAMFORMING VIA LOW-RANK APPROXIMATION 20

CONSTANT MODULUS BEAMFORMING VIA LOW-RANK APPROXIMATION

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IEEE Statistical Signal Processing Workshop (SSP)

作者： Adler, Amir Wax, Mati MIT 77 Massachusetts Ave Cambridge MA 02139 USA Technion IL-32000 Haifa Israel

ISBN: (纸本)9781538615713

We present novel convex-optimization-based solutions to the problem of blind beamforming of constant modulus signals, and to the related problem of linearly constrained blind beamforming of constant modulus signals. These solutions are based on a low-rank approximation, ensure global optimality and are parameter free, namely, do not contain any tuneable parameters and do not require any a-priori parameter settings. The proposed approach outperforms state-of-the-art both in terms of the number of required samples for convergence, and in terms of the beamformer output SINR.

关键词： blind beamforming constant modulus algorithm low-rank approximation trace norm

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THE RESEARCH AND ANALYSIS OF constant modulus AND MSE-BASED VARIABLE STEP SIZE CMA

THE RESEARCH AND ANALYSIS OF CONSTANT MODULUS AND MSE-BASED ...

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10th IEEE International Computer Conference on Wavelet Active Media Technology and Information Processing (ICCWAMTIP)

作者： Li, Wei Gu, Xiao-Feng Bao, Yan-Li Univ Elect Sci & Technol China Sch Comp Sci & Engn Int Ctr Wavelet Anal & Its Applicat Chengdu 611731 Peoples R China

ISBN: (纸本)9781479924455;9781479924448

In digital communication systems, due to multipath transmission and the bandwidth of cable, there are some ISI(inter-symbol-interference) in the signals. Blind equalization that does not require a pilot sequence can transmit adaptive equalizer tap coefficients and can effectively remove inter-symbol interference. This paper introduces the principle of blind equalization technique that focus on the constant modulus algorithm and MSE-based variable step size CMA algorithms. We will simulation on two kinds of algorithms by using Matlab. Moreover, we also analysis their performance.

关键词： constant modulus algorithm MSE digital communication system

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An adaptive receiver for constant modulus signal interference suppression in civil aviation air-ground communication

An adaptive receiver for constant modulus signal interferenc...

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Asia-Pacific Conference on Communications

作者： Wu, Renbiao Huang, Jianyu Zhang, Chuntian Zhong, Lunlong Shi, Qingyan Ma, Jianli Tianjin Univ Dept Elect Engn Tianjin 300072 Peoples R China Civil Aviat Univ China Tianjin Key Lab Adv Signal Proc Tianjin 300300 Peoples R China

ISBN: (纸本)9781424413737

This paper focuses on the main interference signals of the civil aviation air-to-ground communication, which characteristics is constant modulus. An interference suppression receiver based on constant modulus algorithm (CMA) and adaptive cancelling technique is developed in this paper. The constant modulus algorithm is used to extract the reference signal from mixed signal and adaptive canceller is used to subtract the constant modulus interference The experimental results show that the system is applicable and effective.

关键词： adaptive receiver constant modulus algorithm civil aviation air-ground communication

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Low complexity constant modulus based cyclic blind adaptive multiuser detection

Low complexity constant modulus based cyclic blind adaptive ...

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7th Africon Conference in Africa

作者： Whitehead, J Takawira, F Univ KwaZulu Natal Sch Elect Elect & Comp Engn ZA-4041 Durban South Africa

ISBN: (纸本)0780386051

关键词： blind adaptive multiuser detection constant modulus algorithm cyclic algorithms DS-CDMA frequency shift filtering multi-rate CDMA

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BLIND BEAMFORMER FOR constant modulus SIGNALS BASED ON RELEVANCE VECTOR MACHINE

BLIND BEAMFORMER FOR CONSTANT MODULUS SIGNALS BASED ON RELEV...

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

作者： Hwang, Kyuho Choi, Sooyong Yonsei Univ Sch Elect & Elect Engn Seoul 120749 South Korea

ISBN: (纸本)9781457705397

The blind beamforming method for constant modulus (CM) signals based on relevance vector machine (RVM) is proposed. The proposed beamforming method is obtained by incorporating the constant modulus algorithm (CMA)-like error function into the conventional RVM framework. The RVM framework formulates the parameters of beamfomer by exploiting a probabilistic Bayesian learning procedure with assumption of Gaussian prior for parameters. The simulation results show that the proposed blind beamforming method can restore the desired signals with crowded interference signals.

关键词： Blind beamforming constant modulus algorithm Relevance vector machine

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