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| A Novel Modulation Identification Algorithm for Multi-path Channels Based on Blind Channel Identification and Equalization |
| Wang Bin①; Ge Lin-dong①; Xu Li-qing②; Liu Yuan-tao① |
| ①Institute of Information Engineering, Information Engineering University of PLA, Zhengzhou 450002, China; ②Unit 69010 of PLA, Urumchi 830031, China |
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Abstract A modulation identification algorithm based on blind channel identification and equalization is proposed for MPSK and MQAM signals in multi-path environments. The channel order is estimated accurately first. Then, the eigenvalue perturbation analysis is done on the basis of matrix outer-product decomposition to get the more stable performance of channel blind identification and equalization. Finally, the multistage blind subtractive clustering method is used for the equalized constellation to determine the modulation type. Compared with the existing methods, it is a simple solution with smaller number of symbols for more modulation types and is more suitable for the practical application. Simulation results prove the effectiveness of the algorithm.
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Received: 25 December 2006
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2008, Vol. 30 
