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Volume 29 Issue 6
Jan.  2011
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Xu Xiao-dong, Dai Xu-chu, Xu Pei-xia. Weighted Multimodulus Blind Equalization Algorithm for High-Order QAM Signals[J]. Journal of Electronics & Information Technology, 2007, 29(6): 1352-1355. doi: 10.3724/SP.J.1146.2005.01422
Citation: Xu Xiao-dong, Dai Xu-chu, Xu Pei-xia. Weighted Multimodulus Blind Equalization Algorithm for High-Order QAM Signals[J]. Journal of Electronics & Information Technology, 2007, 29(6): 1352-1355. doi: 10.3724/SP.J.1146.2005.01422

Weighted Multimodulus Blind Equalization Algorithm for High-Order QAM Signals

doi: 10.3724/SP.J.1146.2005.01422
  • Received Date: 2005-11-07
  • Rev Recd Date: 2006-04-20
  • Publish Date: 2007-06-19
  • A new weighted multimodulus blind equalization algorithm is proposed in this paper. The proposed algorithm, which combines the benefits of the MultiModulus Algorithm (MMA) and the Decision-Directed Algorithm (DDA), utilizes exponential weighted symbols of the slicers output to adjust the modulus in the cost function. During the equalizer tab update process, the weight term varies according to the decided symbols as well as the MSE estimation for more accurate adjustment. Analysis and simulation results demonstrate that compared with other blind equalization algorithms including MMA, the proposed algorithm provides superior performance by increasing the convergence rate and decreasing the steady-state mean square error, which is more efficient for high-order QAM signals.
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  • Sato Y. A method of self-recovering equalization for multilevel amplitude modulation systems[J].IEEE Trans. on Commun.1975, 23(6):679-682[2]Godard D N. Self-recovering equalization and carrier tracking in two-dimensional data communication systems IEEE Trans. on Commun., 1980, 28(11): 1867-1875.[3]Benveniste A and Gourst M. Blind equalizers[J].IEEE Trans. on Commun.1984, 32(8):871-883[4]Godard D N and Thirion P E. Method and device for training an adaptive equalizer by means of an unknown data signal in a QAM transmission system. U.S. Patent, 4 227 152, Oct. 7, 1980.[5]Picchi G and Prati G. Blind equalization and carrier recovery using a stop and go decision-directed algorithm[J].IEEE Trans. on Commun.1987, 35(9):877-887[6]Abrar S. Compact constellation algorithm for blind equalization of QAM signals. IEEE International Conference on Networking and Communication, Lahore, Pakistan, 11-13 June 2004: 170-174.[7]Yang J, Werner J J, and Dumont G A. The multimodulus blind equalization and its generalized algorithm[J].IEEE Journal on Sel. Areas in Commun.2002, 20(5):997-1015[8]Labat J and Macchi O. Adaptive decision feedback equalization: can you skip the training period?[J].IEEE Trans. on Commun.1998, 46(7):921-930
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