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This paper presents some results on MMSE turbo equalization applied to real sea water trials in the Atlantic ocean. High order modulations (8-PSK, 16-QAM and 32-QAM) have been tested. The channel data rate on the underwater acoustic channel is up to 20 kbps. The receiver includes timing recovery, equalization, interleaving and channel coding. The results which are evaluated in term of bit error rate...
This paper presents some new results on MMSE turbo equalization applied to real sea water trials in the Atlantic ocean. High data rate QPSK communications (2 to 7 kbps) have been tested. The receiver includes timing recovery, equalization, interleaving and channel coding. The results which are evaluated in term of BER and MSE show that turbo equalization improves the performance of the receiver.
In this paper, we propose a dominant Doppler compensation technique for single carrier single input multiple output (SIMO) underwater acoustic communication. An initial pre-processing of the dominant Doppler is used to speed up the convergence rate of the adaptive receiver at the beginning of the transmission. Then, a tracking scheme is proposed to compensate for the residual dominant Doppler. The...
The paper describes a novel approach to overcome the need for matrix inversion required by minimum mean square error (MMSE) turbo equalization in MIMO systems. In particular, turbo MMSE equalization based on an efficient series expansion from a truncated Taylor series expansion to approximate the matrix inversion is addressed. By adjusting a scaling factor, the proposed series expansion is directly...
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