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Instantaneous Gradient based Dual Mode Wavelet Neural Network Blind Equalization for Underwater Acoustic Channel |
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PP: 1467-1473 |
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Author(s) |
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Ying XIAO,
Yuhua DONG,
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Abstract |
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| To further improve the performance of wavelet neural network blind equalization based on constant modulus algorithm
(CMA) cost function, an instantaneous gradient based dual mode between modified constant modulus algorithm (MCMA) and decision
directed (DD) algorithm was proposed. The wavelet neural network weights change quantity of the adjacent iterative process is defined
as instantaneous gradient. After the network attains convergence, the weights of wavelet neural network achieve a stable energy state
and the instantaneous gradient would be zero. Therefore dual mode algorithm can be realized by criterion which set according to the
instantaneous gradient. Computer simulation results show that the dual mode wavelet neural network blind equalization algorithm
proposed in this paper improves the convergence rate and convergence precision effectively, and it has good tracking ability for
underwater acoustic channel. |
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