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A Class of Channels Resulting in Ill-Convergence for CMA in decision Feedback Equalizers

IEEE TRANSACTIONS ON SIGNAL PROCESSING 2010年第11期58卷 5736-5743页

作者： Neves, Aline Panazio, Cristiano Univ Fed ABC Ctr Engn Modelagem & Ciencias Sociais Aplicadas BR-09210170 Sao Paulo Brazil Univ Sao Paulo Escola Politecn BR-05508900 Sao Paulo Brazil

This paper analyzes the convergence of the constant modulus algorithm (CMA) in a decision feedback equalizer using only a feedback filter. Several works had already observed that the CMA presented a better performance than decision directed algorithm in the adaptation of the decision feedback equalizer, but theoretical analysis always showed to be difficult specially due to the analytical difficulties presented by the constant modulus criterion. In this paper, we surmount such obstacle by using a recent result concerning the CM analysis, first obtained in a linear finite impulse response context with the objective of comparing its solutions to the ones obtained through the Wiener criterion. The theoretical analysis presented here confirms the robustness of the CMA when applied to the adaptation of the decision feedback equalizer and also defines a class of channels for which the algorithm will suffer from ill-convergence when initialized at the origin.

关键词： Blind equalization constant modulus algorithm decision directed algorithm decision feedback equalization ill-convergence

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Concurrent Blind Equalization Suitable for 16-QAM Signal

Concurrent Blind Equalization Suitable for 16-QAM Signal

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International Conference on Wireless Communications and Signal Processing

作者： Rao, Wei Tan, Wen-qun Li, Da-she Dai, Guo-xing Xia, Fei Fan, Li Liu, Jian-bing Xu, Hui-jun Nanchang Inst Technol Dept Elect & Elect Engn Nanchang Peoples R China

ISBN: (纸本)9781424448562

A new concurrent scheme for blind equalization suitable for 16-QAM signal is proposed. It combines Modified Modulus algorithm (MCMA) and Modified decision directed (MDD) algorithm. By exploiting the inherent structural relationship between the 4-QAM signal's coordinates and 16-QAM signals' coordinates, another style of cost function for Constant Modulus algorithm (CMA) is defined, and we have proved that MCMA with such cost function outperforms the conventional CMA considerably. Unfortunately, MCMA has the same inherent defect as CMA which is that it is not sensitivity for phase offset of received signals. So when it occurs, the performance of MCMA will be impaired and even MCMA cannot work. Accordingly for overcoming the shortcomings of MCMA we introduce the decision directed (DD) algorithm, and modify it with the same method as MCMA. Consequently the new concurrent blind equalization with MCMA and MUD is proposed. Simulation results with underwater acoustic channel model show that the proposed algorithm achieves satisfactory performance.

关键词： concurrent blind equalization constant modulus algorithm decision directed algorithm

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Combination Blind Equalization Suitable for 4-PAM and 16-QAM Signals

Combination Blind Equalization Suitable for 4-PAM and 16-QAM...

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3rd International Conference on Environmental Science and Information Application Technology (ESIAT)

作者： Rao, Wei Nanchang Inst Technol Nanchang 330099 Peoples R China

In digital communication system, De Castro et al. proposed a combination blind equalization based on a constant modulus algorithm (CMA) and a decision directed (DD) operating concurrently (CMA+DD) which is known to outperform the CMA considerably, however it still only achieves moderate steady-state mean square error (MSE). Then a new CMA based on modified function is discussed in such combination blind equalization scheme. For the 4-PAM and 16-QAM signals, by adjusting the coordinates of received signals the cost function will become exactly zero when the channel is perfectly equalized. So the proposed algorithm can obtain lower steady-state MSE than CMA+DD. Simulation results show that the proposed method achieves satisfactory performance. (C) 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of Conference ESIAT2011 Organization Committee.

关键词： blind equalization constant modulus algorithm decision directed algorithm coordinate transformation

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Combination Blind Equalization Suitable for 4-PAM and 16- QAM Signals

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Procedia Environmental Sciences 2011年 10卷 1270-1275页

作者： Wei Rao Nanchang Institute of Technology Nanchang 330099 P.R. China

In digital communication system, De Castro et al. proposed a combination blind equalization based on a constant modulus algorithm (CMA) and a decision directed (DD) operating concurrently (CMA+DD) which is known to outperform the CMA considerably, however it still only achieves moderate steady-state mean square error (MSE). Then a new CMA based on modified function is discussed in such combination blind equalization scheme. For the 4- PAM and 16-QAM signals, by adjusting the coordinates of received signals the cost function will become exactly zero when the channel is perfectly equalized. So the proposed algorithm can obtain lower steady-state MSE than CMA+DD. Simulation results show that the proposed method achieves satisfactory performance.

关键词： blind equalization constant modulus algorithm decision directed algorithm coordinate transformation

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Novel Blind Equalizer Based on SE-CMA and DD algorithm

Novel Blind Equalizer Based on SE-CMA and DD Algorithm

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2012 International Conference on Environmental Engineering and Technology(ICEET2012)

作者： Li Yuanmin,Rao Wei Nanchang Institute of Technology,Nanchang,330099,China

A novel blind equalizer suitable for high-order QAM signals is proposed,which combines Signed-Error Constant Modulus algorithm(SE-CMA) and decision directed(DD) *** proposed algorithm makes full use of the advantages of SE-CMA and DD algorithm and these two algorithms operate *** with underwater acoustic channels are used to compare the proposed algorithm with the famous Constant Modulus algorithm(CMA).The simulation results show that the proposed algorithm has faster convergence rate and lower steadystate mean square error.

关键词： Adaptive Filter Constant Modulus algorithm decision directed algorithm Underwater Acoustic Channel

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Combination Blind Equalization Suitable for 4-PAM and 16-QAM Signals

Combination Blind Equalization Suitable for 4-PAM and 16-QAM...

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2011 3rd International Conference on Environmental Science and Information Application Technology(ESIAT 2011)

作者： Wei Rao Nanchang Institute of Technology

In digital communication system, De Castro et al. proposed a combination blind equalization based on a constant modulus algorithm(CMA) and a decision directed(DD) operating concurrently(CMA+DD) which is known to outperform the CMA considerably, however it still only achieves moderate steady-state mean square error(MSE). Then a new CMA based on modified function is discussed in such combination blind equalization scheme. For the 4-PAM and 16-QAM signals, by adjusting the coordinates of received signals the cost function will become exactly zero when the channel is perfectly equalized. So the proposed algorithm can obtain lower steady-state MSE than CMA+DD. Simulation results show that the proposed method achieves satisfactory performance.

关键词： blind equalization constant modulus algorithm decision directed algorithm coordinate transformation

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