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2009 Asia-Pacific Conference on Information Processing

作者： Wei Rao,Jian-bing Liu,Yuan-yuan Liu,Wen-qun Tan,Hui-jun Xu,Kang-ming Yuan,Guo-xing Dai Nanchang Institute of Technology Nanchang,330099,China

A new series equalizer based on constant modulus algorithm(CMA) and Decision-directed(DD) algorithm is proposed to overcome Inter-Symbol Inter-ference(ISI) much better in the communication system without the aid of training *** proposed equalizer uses the CMA as the forward filter and DD algorithm as the back *** two filters are series and operate *** makes full use of the advantages of the CMA's "eye-opened" ability and DD's superior convergence *** the proposed equalizer obtains not only the faster convergence and lower residual error but also the ability of phase *** simulations with underwater acoustic channels are presented and the simulation results are shown to prove the efficiency of the proposed equalizer.

关键词： seriers equalizer constant modulus algorithm decision-directed algorithm underwater acoustic channel

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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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Novel Blind Equalizer for Coherent DP-BPSK Transmission Systems: Theory and Experiment

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IEEE PHOTONICS TECHNOLOGY LETTERS 2013年第18期25卷 1835-1838页

作者： Pincemin, Erwan Brochier, Nicolas Selmi, Mehrez Chahabi, Omid Zia Ciblat, Philippe Jaouen, Yves Orange Labs France Telecom Dept Orange Labs Network F-22300 Lannion France Telecom Paristech COMELEC F-75039 Paris France

Adaptive blind equalization based on constant modulus algorithm is very efficient to carry out polarization separation and inter-symbol interference compensation in a coherent dual-polarization quaternary-phase-shift-keying transmission system. Its performance is, however, very poor when coherent dual-polarization binary-phase-shift-keying (BPSK) modulation is considered. In this letter, we propose a new blind equalizer adapted to any PSK constellation and we theoretically show its convergence. Experimental BER measurements and convergence analysis are performed in a 40 Gbps coherent dual-polarization BPSK system under different physical impairments. We show that our equalizer outperforms existing blind algorithms.

关键词： Coherent optical communications binary-phase shift-keying blind equalization constant modulus algorithm

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Concurrent Blind Channel Equalization in Impulsive Noise Environments

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CHINESE JOURNAL OF ELECTRONICS 2013年第4期22卷 741-746页

作者： Li Sen Wang Yan Lin Bin Dalian Maritime Univ Coll Informat Sci & Technol Dalian 116026 Peoples R China

In some communication systems the transmitted signal is contaminated by impulsive noise with a non-Gaussian distribution. Non-Gaussian noise caused significant performance degradation to communication receivers. The new constant modulus blind equalizer based on Fractional lower-order statistics of the equalizer input, which is defined as FLOS_CMA, is able to mitigate impulsive channel noise while restoring the constant modulus character of the transmitted communication signal. However, like the constant modulus algorithm (CMA), the steady-state Mean square error (MSE) of the FLOS_CMA algorithm may not be sufficient low for the system to obtain adequate performance. This paper proposes a concurrent equalizer, in which a Decision-directed least mean p norm (DD_LMP) equalizer operates cooperatively with a FLOS_CMA equalizer, controlled through a non-linear link. Simulation results using M-QAM and 8-PSK signaling have shown that besides the capability of compensating the phase offset, the proposed concurrent FLOS_CMA and DD_LMP blind equalizer has faster convergence rate and lower steady-state MSE than the FLOS_CMA approach.

关键词： Alpha-stable distribution Fractional lower-order statistics Least mean p norm constant modulus algorithm Concurrent equalizer

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Efficient parallel architecture for implementation of the CMA adaptive antenna

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IETE TECHNICAL REVIEW 2013年第4期30卷 303-312页

作者： Boonpoonga, Akkarat Sirisuk, Phaophak Krairiksh, Monai King Mongkuts Univ Technol North Bangkok Fac Engn Dept Elect & Comp Engn Bangkok 10800 Thailand King Mongkuts Inst Technol Ladkrabang Int Coll Bangkok Thailand King Mongkuts Inst Technol Ladkrabang Fac Engn Bangkok Thailand

This paper presents an efficient parallel architecture for implementation of a constant modulus algorithm (CMA) adaptive array antenna. By inserting delay units into the original CMA, a novel delayed CMA (DCMA) that can significantly reduce the associated critical path is derived. Consequently, a pipelining architecture that supports parallel processing is introduced for implementation of the DCMA. In addition to the pipelining technique, a power-of-two multiplier is proposed for the DCMA leading to the efficient FPGA implementation. The effects of delays and finite word-length on the convergence property of CMA are investigated via simulations. Moreover, the synthesized results demonstrate that FPGA implementation of the proposed architecture using power-of-two arithmetic achieves 26.9% resource reduction in comparison with that of fixed-point arithmetic and operating clock frequency higher than 65 MHz. The implemented FPGA was tested to confirm that the designed architecture operates well for CMA.

关键词： Adaptive antenna constant modulus algorithm Field programmable gate array Pipelining

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Hardware-assisted initialisation for constant modulus algorithm adaptive antenna

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IET MICROWAVES ANTENNAS & PROPAGATION 2008年第4期2卷 303-311页

作者： Boonpoonga, A. Sirisuk, P. Chongcheawchamnan, M. Patisang, S. Krairiksh, M. King Mongkuts Inst Technol Ladkrabang Fac Engn Bangkok 10520 Thailand King Mongkuts Inst Technol Ladkrabang Res Ctr Commun & Informat Technol Bangkok 10520 Thailand Mahanakorn Univ Technol Fac Engn Bangkok 10530 Thailand

A cost-effective approach for initialisation of an adaptive antenna based on the constant modulus algorithm (CMA) is proposed. The technique utilises 1 bit phase shifters and a power detector, which are normally integrated with a multibeam antenna, to determine the maximum power beam direction. Consequently, the beam is exploited as an initial beam for CMA. Development of hardware-assisted initialisation is discussed. In addition field programmable gate array implementation of a CMA processor and associated control circuitry is presented. Several simulations are performed to evaluate the performance of the proposed initialisation technique. In addition, the developed prototype is tested with a phase array antenna designed for operation at the IMT2000 frequency of 1.95 GHz. Experimental results confirm superiority of the proposed technique.

关键词： Other analogue circuits field programmable gate arrays multibeam antenna field programmable gate array constant modulus algorithm hardware-assisted initialisation adaptive antenna arrays phase shifters associated control circuitry Logic circuits CMA processor CMA based adaptive antenna Antenna arrays power detector

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Application of the Square Contour algorithm in Blind Equalizers Based on Complex Neural Networks

Application of the Square Contour Algorithm in Blind Equaliz...

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3rd International Conference on Consumer Electronics, Communications and Networks (CECNet)

作者： Zhao, Juan Jingchu Univ Technol Sch Elect & Informat Engn Jingmen Peoples R China

ISBN: (纸本)9781479928606

The error function is important for the blind equalizer based on neural networks to adaptively adjust its parameters. Aiming at finding a new error function, the paper studied the square contour algorithm (SCA) and the complex backward propagation neural networks (CBPNN). The properties of the equalizers based on the cost function of SCA were simulated, and comparison was made with that of CMA. Results show that the equalizer with cost function of SCA converges slower and the byte-error rate (BER) is greater than that of CMA. The residual errors are the same because the cost function only varies in appearance. Therefore, in designing the equalizer based on CBPNN, it is not advisable to replace the error function of CMA with that of SCA.

关键词： square contour algorithm complex neural network blind equalization algorithm constant modulus algorithm

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A Variable Step Size Technique for CMA Blind Equalization in Filter Bank Based Multicarrier Systems

A Variable Step Size Technique for CMA Blind Equalization in...

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International Conference on Control Communication and Computing (ICCC)

作者： Gopan, Neethu Radha Sheeba, V. S. Govt Engg Coll ECE Dept Trichur Kerala India

ISBN: (纸本)9781479905751;9781479905737

The filter bank based multicarrier modulation (FBMC) is a transmission technique better suited for new concepts such as dynamic access spectrum management (DASM) and cognitive radio. Filter bank-based transmultiplexer systems have certain advantages compared with existing OFDM/DFT-based multicarrier systems and they are promising candidates for high rate data transmission. However, efficient channel equalization techniques for such systems are still an active area of development. In this paper we first implement the FBMC system using cosine-modulated filter banks and the prototype filter for this system is designed using the Kaiser window approach. Then, we perform blind equalization using constant modulus algorithm (CMA). However, due to fixed step size, CMA suffers from a trade off between convergence rate and steady-state error. The choice of step size for updating the tap weights is very critical for CMA. Hence we introduce enhanced variable step size CMA (VSS-CMA) which utilizes a nonlinear function of the remainder error to control the step size. Simulation results show that the proposed algorithm provides better performance in terms of error convergence and bit error rate than the existing method.

关键词： Variable Step Size non linear function remainder error constant modulus algorithm Blind Equalization Cosine Modulated Filter Banks

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IMPROVED algorithm FOR BLIND CHANNEL EQUALIZATION

IMPROVED ALGORITHM FOR BLIND CHANNEL EQUALIZATION

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

作者： Tang, Pan-Shi Li, Jian-Ping Yang, Fan Univ Elect Sci & Technol China Sch Comp Sci & Engn Chengdu 611731 Peoples R China

ISBN: (纸本)9781479924455;9781479924448

This paper describes the blind channel equalization for constant modulus algorithm mathematical model and principle. Focusing on the CMA blind equalization slow convergence and convergence error, the paper analyzes and simulates recent years constant modulus algorithm and improved algorithm based on residual error and leak CMA nonlinear transformation algorithm. The results show that, compared with the constant modulus algorithm improved algorithm can improve the convergence speed.

关键词： constant modulus algorithm blind equalization leakage CMA algorithm

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Set-Membership Adaptive constant modulus Beamforming Based on Generalized Sidelobe Cancellation with Dynamic Bounds

Set-Membership Adaptive Constant Modulus Beamforming Based o...

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ISWCS 2013;The Tenth International Symposium on Wireless Communication Systems

作者： Yunlong Cai Rodrigo C. de Lamare Zhejiang University University of York

In this work, we propose an adaptive setmembership constant modulus (SM-CM) algorithm with a generalized sidelobe canceler (GSC) structure for blind beamforming. We develop a stochastic gradient (SG) type algorithm based on the concept of SM filtering for adaptive implementation. The filter weights are updated only if the bounded constraint cannot be satisfied. In addition, we also propose an extension of two schemes of time-varying bounds for beamforming with a GSC structure and incorporate parameter and interference dependence to characterize the environment for improving the tracking performance of the proposed algorithm in dynamic scenarios. Simulation results show that the proposed adaptive SM-CM-GSC algorithm with dynamic bounds achieves superior performance to previously reported methods at a reduced update rate.

关键词： Adaptive beamforming Set-membership filtering constant modulus algorithm

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