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A Dual-Mode Blind Equalization Algorithm for Underwater Acoustic Channel |
Zhang Yan-ping①②; Zhao Jun-wei①; Li Jin-ming① |
①Institute of Acoustics Engineering, Northwestern Polytechnical University, Xi'an 710072, China;②Shanxi Teacher's University, Linfen 041004, China |
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Abstract A kind of Dual-mode Constant Modulus Algorithm(DCMA) based on fractionally-spaced equalization for blind equalization is presented to compensate the defects of the Constant Modulus Algorithm(CMA) and the Signed-Regressor CMA(SR-CMA). DCMA combines the conventional CMA and SR-CMA, and the switch process between CMA and SR-CMA is realized by decision circle ring which boundary is decided by the signal-to-noise radio. Computer simulation proves that DCMA is more robust than SR-CMA and more computationally efficient than CMA, and its residual mean-square error is lower than that of CMA and SR-CMA.
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Received: 19 May 2004
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