A frequency-domain channel equalization and phase correction method was proposed in a previous work published in Oceans'07 conference, in which 10^-4 BER performance was presented for fixed-to-fixed source/receiver channels. The method is improved by using minimum mean square error (MMSE) estimation in channel updates rather than least squares estimation. It is applied to moving-to-fixed channels in the AUVFest'07 ocean experiment where single-carrier wideband transmission was employed with quadrature phase shift keying modulation. The moving source channels exhibit higher Doppler shift and larger Doppler drift than the fixed-to-fixed channels. Therefore, the number of symbols required for initial phase estimation is increased from 2 to 8 symbols when the group- wise phase correction algorithm is applied to the moving sources. Thirty-six packets with data block length of 512 symbols have been processed and 34 of them achieved an uncoded Bit Error Rate (BER) lower than 10-2. The overall uncoded BER performance of all 36 packets is 1.81 times 10^-3 which is slightly higher than that of the fixed-to-fixed channels.
Y. R. Zheng et al., "Further Results on Frequency-Domain Channel Equalization for Single Carrier Underwater Acoustic Communications," Proceedings of the MTS/IEEE Kobe Techno-Ocean, OCEANS 2008, Institute of Electrical and Electronics Engineers (IEEE), Apr 2008.
The definitive version is available at http://dx.doi.org/10.1109/OCEANSKOBE.2008.4531074
MTS/IEEE Kobe Techno-Ocean, OCEANS 2008
Electrical and Computer Engineering
Mining and Nuclear Engineering
National Science Foundation (U.S.)
United States. Office of Naval Research
Keywords and Phrases
Doppler Shift; Least Mean Squares Methods; Oceanographic Techniques; Underwater Acoustic Communication
Article - Conference proceedings
© 2008 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.