In this paper, we employ a time-domain channel estimation, equalization and phase correction scheme for single carrier single input multiple output (SIMO) underwater acoustic communications. In this scheme, Doppler shift, which is caused by relative motion between transducer (source) and hydrophones (receiver), is estimated and compensated in the received baseband signals. Then the channel is estimated using a small training block at the front of a transmitted data package, in which the data is artificially partitioned into consecutive data blocks. The estimated channel is utilized to equalize a block of received data, then the equalized data is processed by a group-wise phase correction before data detection. At the end of the detected data block, a small portion of the detected data is utilized to update channel estimation, and the re-estimated channel is employed for channel equalization for next data block. This block-wise channel estimation, equalization and phase correction process is repeated until the entire data package is processed. The receiver scheme is tested with experimental data measured at Saint Margaret's Bay, Nova Scotia, Canada, in May 2006. The results show that it can be applied not only to the scenario of fixed source to fixed receiver, but also to the moving source to fixed receiver case. The achievable uncoded bit error rate (BER) is on the order of 10-4 for moving-to-fixed transmissions, and on the order of 10-5 for fixed-to-fixed transmissions.
J. Tao et al., "Channel Estimation, Equalization and Phase Correction for Single Carrier Underwater Acoustic Communications," Proceedings of 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.2008.4531083
MTS/IEEE Kobe Techno-Ocean OCEANS 2008
Electrical and Computer Engineering
National Science Foundation (U.S.)
United States. Office of Naval Research
Keywords and Phrases
Doppler Shift; Channel Estimation; Oceanographic Techniques; Underwater Acoustic Communication
Article - Conference proceedings
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