An Improved Combination of Constant Modulus Algorithms Used in Underwater Acoustic Channels

2010 ◽  
pp. 694-700
Author(s):  
Xiaoling Ning ◽  
Zhong Liu ◽  
Yasong Luo
Keyword(s):  
Constant Modulus ◽  
Underwater Acoustic ◽  
Underwater Acoustic Channels

New Concurrent Fractionally-Spaced Blind Equalization

2010 ◽  
Vol 108-111 ◽  
pp. 363-368 ◽  
Author(s):  
Wei Rao ◽  
Ye Cai Guo ◽  
Min Chen ◽  
Wen Qun Tan ◽  
Jian Bing Liu ◽  
...  
Keyword(s):  
Steady State ◽  
Convergence Rate ◽  
Mean Square Error ◽  
Blind Equalization ◽  
Mean Square ◽  
Constant Modulus ◽  
Constant Modulus Algorithm ◽  
Underwater Acoustic ◽  
Underwater Acoustic Channels ◽  
Simulation Results

The paper proposes a concurrent constant modulus algorithm (CMA) and decision-directed (DD) scheme for fractionally-spaced blind equalization. The proposed algorithm makes full use of the advantages of CMA and DD algorithm. A novel rule to control the adjustment of DD’s tap weights vector is proposed which avoids the hard switch between CMA and DD in practice. Simulations with underwater acoustic channels are used to compare the proposed algorithm with the famous CMA. And the simulation results show that the proposed algorithm has faster convergence rate and lower steady state mean square error.

Novel DFE for Underwater Acoustic Channels

2013 ◽  
Vol 760-762 ◽  
pp. 691-694
Author(s):  
Yan Liu ◽  
Yuan Min Li
Keyword(s):  
Cost Function ◽  
Communication Systems ◽  
Channel Equalization ◽  
Decision Feedback ◽  
Underwater Acoustic Communication ◽  
Constant Modulus ◽  
Constant Modulus Algorithm ◽  
Underwater Acoustic ◽  
Underwater Acoustic Channels ◽  
Receive System

In underwater acoustic communication systems, the channel equalization community has recently given much attention to decision feedback equalization (DFE). It is because that the DFE offers intersymbol interference (ISI) cancellation with reduced noise enhancement. However, its key algorithm such as constant modulus algorithm (CMA) has moderate convergence rate and steady-state mean square error (MSE), which is not sufficient for the receive system of communication. So a new cost function is defined and then a novel DFE based on such cost function is proposed. The efficiency of the proposed DFE is proved by computer simulations.

Robust Equalization of Mobile Underwater Acoustic Channels

2015 ◽  
Vol 40 (4) ◽  
pp. 775-784 ◽  
Author(s):  
Konstantinos Pelekanakis ◽  
Mandar Chitre
Keyword(s):  
Underwater Acoustic ◽  
Underwater Acoustic Channels
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