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Indirect Adaptive Equalization Algorithm for Shallow Water Acoustic Communication |
Wei Xin; Zhao Li; Zou Cai-rong |
Department of Radio Engineering, Southeast University, Nanjing 210096, China |
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Abstract To eliminate inter-symbol interference brought from the shallow water acoustic channel which has property of time varying and multi path, an indirect adaptive equalization algorithm is proposed in this paper. A frame structure is designed, adapted to shallow water acoustic communication system in the transmitter. At receiver, frame header is used to perform fast channel estimation and initialization of equalization tap coefficients, the thresholds are set to activate taps of special position, and a variable step LMS adaptive algorithm is chosen to reduce further error when receiving frame body symbols. Theoretical analysis and simulation results show that the algorithm has fast convergence and low hardware complexity. Besides, it has good effect on the high-order modulated signal. Therefore, it will be suitable for shallow water high speed digital communication system.
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Received: 25 December 2007
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