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3rd IEEE Conference on Industrial Electronics and Applications (ICIEA 2008)

作者： Zhu Ting-ting Wang Ying-min NW Polytech Univ Coll Marine Engn IEEE Conf Ind Elect & Applicat 3 Xian 710072 Peoples R China

ISBN: (纸本)9781424417186

The constant modulus algorithm is a widely used blind equalization algorithm. But it has a disadvantage for its initialization. Its convergence characteristics depends on its preliminary tap gains. The paper introduced the method of optimization and the technology of small swatch repetition to overcome the initialization's effect and accelerate the convergence. Computer simulation is implemented with QAM system. The algorithm achieves the goal and is proved successful.

关键词： blind equalization constant modulus algorithm the simulated annealing initialization

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A Design and Simulation on constant modulus algorithm Based on Cascaded Blind Equalizer

A Design and Simulation on Constant Modulus Algorithm Based ...

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2nd International Symposium on Test Automation and Instrumentation

作者： Guo Yecai Lin Rengang Yang Chao Nanjing Univ Informat Sci &Technol Nanjing 210044 Peoples R China

ISBN: (纸本)9787506292207

For overcoming the low convergent rate and high mean square error of constant modulus algorithm (CMA) and utilizing the advantages of the Fractionally Spaced Equalizer (FSE) containing lots of channel information, a Cascaded Blind Equalizer based on CMA (CBE-CMA) is proposed. The proposed CBE-CMA is a combination of Baud Spaced Equalizer based on CMA (BSE-CMA) and T/2 Fractionally Spaced Equalizer based on CMA (T/2-FSE-CMA), uses T/2-FSE-CMA as its first level and employs BSE-CMA for its second level. Owing to the ability of the CBE-CMA to compensate for the distortion of channel, to suppress inter-symbol interference, and to recovery transmitted sequence twice, so it outperforms BSE-CMA and T/2-FSE-CMA in improving convergent rate and reducing mean square error. The efficiency of the proposed CBE-CMA is proved by computer simulation with multi-path water acoustic channels.

关键词： constant modulus algorithm fractionally spaced cascaded blind equalizer multi-path underwater acoustic channel

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Robust Adaptive AutoRegressive Weighted constant modulus algorithm for Blind Equalization in MIMO-OFDM System 3

Robust Adaptive AutoRegressive Weighted Constant Modulus Alg...

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3rd International Conference on Information and Computer Technologies (ICICT)

作者： Girija, S. P. Rao, Rameshwar Osmania Univ Univ Coll Engn Dept ECE Hyderabad Telangana India

ISBN: (数字)9781728172835

ISBN: (纸本)9781728172835

Impulse noise is a major performance degrading factor, as it impairs the communication systems, such as mobile radio system, digital subscriber line system, and power line. Various constant modulus algorithms (CMA) were introduced to reduce the average of constant modulus error between the constant modulus and the equalizer output power in the impulsive noise environment. However, the existing blind learning methods generate large misadjustment and slow convergence rate in the impulse noise of Multiple Input Multiple Output (MIMO) system. To solve the impulse noise problem, the blind equalization method named Robust Adaptive Autoregressive weighted constant modulus algorithm (RAAWCMA) is introduced in this research work for MIMO system. Due to the feasibility and simplicity of stable convergence property, the proposed Robust Adaptive Autoregressive weighted constant modulus algorithm for blind equalization is utilized to solve the complexity of impulse noise in MIMO system. The proposed blind equalization method increases the performance of equalization by adjusting the weight vector based on the samples of output error. Moreover, the maximum average value obtained by the proposed algorithm is revealed based on the evaluation metrics, like Bit Error Rate, Symbol Error Rate, and Mean Square Error which acquire the values of 0.0005, 0.0005, and 0.0001 with the Rayleigh channel, and 0.0004, 0.0004, and 0.0001 with the Rician channel using six antennas.

关键词： blind equalization Multiple Input Multiple Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) constant modulus algorithm impulse noise

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Application of the least squares constant modulus algorithm for multipath removal in the FM signal

Application of the least squares constant modulus algorithm ...

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Conference on Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments

作者： Gajo, Z. Linczuk, M. Warsaw Univ Technol Inst Elect Fundamentals PL-00665 Warsaw Poland

ISBN: (纸本)9780819491718

In Passive coherent location (PCL) radar using FM signal as emitter of opportunity the multipath propagation from transmitter to the reference antenna strongly decreases the radar detection ability. Thus, multipath removal from reference signal is a very important stage of signal processing in radar system. Since the FM signal with constant envelope is used the commonly known constant modulus algorithms suit very well for this purpose. In this introductory paper, we propose to use a block least squares constant modulus algorithm which has better convergence properties then the conventional LMS-type algorithm presented in literature. It appears as very appealing alternative since in further applications (not presented in this paper) it will very likely enable to achieve satisfactory results with less amount of data (signal samples).

关键词： FM signal constant modulus algorithm Passive Coherent Location

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A Beam-forming Method based on constant modulus algorithm combined with Gradient algorithm 4

A Beam-forming Method based on Constant Modulus Algorithm co...

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IEEE 4th Information Technology and Mechatronics Engineering Conference (ITOEC)

作者： Jin, Shazhou Zhang, Yong Yan, Danqing Zhang, Zhongjin He, Lufei Second Res Inst CAAC Chengdu Sichuan Peoples R China

ISBN: (纸本)9781538653739

Focusing on the problem that tracking performance of constant modulus algorithm(CMA) will decrease dramatically in strong interference environment, a beam-forming method based on constant modulus algorithm combined with gradient algorithm is proposed. Based on application of smart antenna, the characteristics of this method are analysed. Finally the applicability of combined method is verified by computer simulation with an example of four element uniform linear array.

关键词： beam-forming constant modulus algorithm gradient algorithm smart antenna

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Blind Equalization using constant modulus algorithm Adapted to OFDM/OQAM Modulation 13

Blind Equalization using Constant Modulus Algorithm Adapted ...

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13th International Symposium on Wireless Communication Systems (ISWCS)

作者： Savaux, Vincent Bader, Faouzi Naoues, Malek ZAC Champs Blancs 1219 Ave Champs Blancs F-35510 Rennes France SCEE IETR Cent Supelec Ave Boulaie F-35576 Rennes Cesson Sevigne France

ISBN: (纸本)9781509020614

It has been proved that the blind equalization using constant modulus algorithm (CMA) is a possible solution for channel inversion in orthogonal frequency division multiplexing/offset quadrature amplitude modulation (OFDM/OQAM). However, the existing solution does not consider the residual interference that remains after equalization, and which is inherent to this type of modulation. In this paper, we propose to reconsider the value of the dispersion parameter in the update algorithm by taking into account this interference in order to enhance the blind equalization performance. The improvement of the CMA in OFDM/OQAM by means of the proposed change of parameter is demonstrated through both theoretical and numerical results.

关键词： Blind equalization constant modulus algorithm OFDM/OQAM

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Series Equalizer Based on constant modulus algorithm and Decision-directed algorithm

Series Equalizer Based on Constant Modulus Algorithm and Dec...

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Asia-Pacific Conference on Information Processing (APCIP 2009)

作者： Rao, Wei Liu, Jian-bing Liu, Yuan-yuan Tan, Wen-qun Xu, Hui-jun Yuan, Kang-ming Dai, Guo-xing Nanchang Inst Technol Nanchang 330099 Peoples R China

ISBN: (纸本)9780769536996

A new series equalizer based on constant modulus algorithm (CMA) and Decision-directed (DD) algorithm is proposed to overcome Inter-Symbol Interference (ISI) much better in the communication system without the aid of training sequences. The proposed equalizer uses the CMA as the forward filter and DD algorithm as the back filter. These two filters are series and operate concurrently. It makes full use of the advantages of the CMA's "eye-opened" ability and DD's superior convergence performance. Therefore the proposed equalizer obtains not only the faster convergence and lower residual error but also the ability of phase rotation-compensated. Computer 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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Convex constant modulus algorithm for PAPR reduction in MIMO-OFDM systems

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International Journal of Electronics Letters 2021年第1期9卷 25-35页

作者： Singh, Davinder Sarin, R.K. Department of ECE Dr. B.R. Ambedkar National Institute of Technology Jalandhar Punjab India

This paper addresses the issue of high peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM)-based multiple-input multiple-output (MIMO) systems. A PAPR reduction technique is developed based on the cost function used in well-known iterative constant modulus algorithm (CMA). We devise a convex optimisation based solution to the CMA cost function for estimating the PAPR precoding weights. The resulting convex CMA solution not only accelerates convergence but also avoids local minima to ensure global optimality. As illustrated by the simulation results, the proposed convex CMA presents superior performance in terms of PAPR reduction with respect to existing techniques. © 2019 Informa UK Limited, trading as Taylor & Francis Group.

关键词： constant modulus algorithm MIMO-OFDM PAPR reduction Trace norm minimisation

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Momentum factor constant modulus algorithm And Theory

Momentum factor Constant Modulus Algorithm And Theory

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International Conference on Information Technology and Management Innovation (ICITMI2012)

作者： Yang, Heng Wang, Jing Guan, Jing Lu, Wei Yunnan Univ Sch Informat Sci & Engn Kunming 650091 Yunnan Peoples R China 750 Test Range CSIC Kunming 650032 Yunnan Peoples R China

ISBN: (纸本)9783037855744

The traditional constant modulus algorithm (CMA) has the disadvantage of slow convergence in blind equalization algorithm. This paper studied one improved algorithm based on momentum factor constant modulus algorithm(MCMA) to solve this problem, momentum factor was added to the weight vector iteration formula of CMA to improve the convergence speed. theoretical analysis and simulation showed that: in the case of the same equalization effect, the MCMA converges faster than the traditional constant modulus algorithm, and also different momentum factors have different convergence effects. The larger the momentum factor, the better convergence effect in the defined domain of the momentum factor.

关键词： Blind equalization Momentum factor constant modulus algorithm Error function

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A multiuser constant modulus algorithm for an antenna array

A multiuser constant modulus algorithm for an antenna array

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International Conference on Wireless Communications, Networking and Mobile Computing

作者： Xu, J Zhu, GQ Zhu, GQ Wuhan Univ Elect & Informat Sch Wuhan 430079 Peoples R China

ISBN: (纸本)078039335X

An adaptive digital filter algorithm that can optimize the signal-to-noise ratio of an antenna array with multiuser signal inputs is presented in this paper. These synchronous communication signals have the constant envelope property and are transmitted through a multiple-input/multiple-output (MIMO) linear channel. This multiuser constant modulus algorithm (MU-CMA) using an antenna array can compensate for both interuser (IUI) and intersymbol interference (ISI). The method is derived by minimizing the cost function of the constant modulus signals as well as cross-correlations between them. The simulation result at the end of this paper shows the performance of this algorithm.

关键词： mutiuser constant modulus algorithm antenna array

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