MIMO-OFDM for High-Rate Underwater Acoustic Communications

Multiple-input-multiple-output (MIMO) techniques have been actively pursued recently in underwater acoustic communications to increase the data rate over the bandwidth-limited channels. In this communication, we present a MIMO system design, where spatial multiplexing is applied with orthogonal-frequency-division-multiplexing (OFDM) signals. The proposed receiver works on a block-by-block basis, where null subcarriers are used for Doppler compensation, pilot subcarriers are used for channel estimation, and a MIMO detector consisting of a hybrid use of successive interference cancellation and soft minimum mean square error (MMSE) equalization is coupled with low-density parity-check (LDPC) channel decoding for iterative detection on each subcarrier. The proposed design has been tested using data recorded from three different experiments. A spectral efficiency of 3.5 b/s/Hz was approached in one experiment, while a data rate of 125.7 kb/s over a bandwidth of 62.5 kHz was achieved in another. These results suggest that MIMO-OFDM is an appealing solution for high-data-rate transmissions over underwater acoustic channels.

[1]  John G. Proakis,et al.  Digital Communications , 1983 .

[2]  M. J. Gans,et al.  On Limits of Wireless Communications in a Fading Environment when Using Multiple Antennas , 1998, Wirel. Pers. Commun..

[3]  Emre Telatar,et al.  Capacity of Multi-antenna Gaussian Channels , 1999, Eur. Trans. Telecommun..

[4]  Georgios B. Giannakis,et al.  Space-time coding for broadband wireless communications , 2003, Wirel. Commun. Mob. Comput..

[5]  Andrew C. Singer,et al.  Minimum mean squared error equalization using a priori information , 2002, IEEE Trans. Signal Process..

[6]  A.B. Baggeroer,et al.  Spatial modulation experiments in the underwater acoustic channel , 2005, IEEE Journal of Oceanic Engineering.

[7]  M. Stojanovic,et al.  Low Complexity OFDM Detector for Underwater Acoustic Channels , 2006, OCEANS 2006.

[8]  Jie Huang,et al.  MIMO-OFDM Over An Underwater Acoustic Channel , 2007, OCEANS 2007.

[9]  H.C. Song,et al.  Multiuser Communications Using Passive Time Reversal , 2006, IEEE Journal of Oceanic Engineering.

[10]  T.M. Duman,et al.  High-Rate Communication for Underwater Acoustic Channels Using Multiple Transmitters and Space–Time Coding: Receiver Structures and Experimental Results , 2007, IEEE Journal of Oceanic Engineering.

[11]  L. Freitag,et al.  This article has been accepted for inclusion in a future issue of this journal. Content is final as presented, with the exception of pagination. IEEE JOURNAL OF OCEANIC ENGINEERING 1 Peer-Reviewed Technical Communication Multicarrier Communication Over Un , 2022 .

[12]  Jie Huang,et al.  Further results on high-rate MIMO-OFDM underwater acoustic communications , 2008, OCEANS 2008.

[13]  Ronald A. Iltis,et al.  Iterative Carrier Frequency Offset and Channel Estimation for Underwater Acoustic OFDM Systems , 2008, IEEE Journal on Selected Areas in Communications.

[14]  Shengli Zhou,et al.  Scalable OFDM design for underwater acoustic communications , 2008, 2008 IEEE International Conference on Acoustics, Speech and Signal Processing.

[15]  Paul Hursky,et al.  Multiinput multioutput OFDM for shallow‐water UWA communications , 2008 .

[16]  V.K. McDonald,et al.  Multichannel combining and equalization for underwater acoustic MIMO channels , 2008, OCEANS 2008.

[17]  Jian Zhang,et al.  Frequency-domain equalization for single carrier MIMO underwater acoustic communications , 2008, OCEANS 2008.

[18]  Fengzhong Qu,et al.  Basis expansion model for underwater acoustic channels? , 2008, OCEANS 2008.

[19]  Milica Stojanovic,et al.  OFDM for underwater acoustic communications: Adaptive synchronization and sparse channel estimation , 2008, 2008 IEEE International Conference on Acoustics, Speech and Signal Processing.

[20]  Chengshan Xiao,et al.  Time-domain receiver design for MIMO underwater acoustic communications , 2008, OCEANS 2008.

[21]  Shengli Zhou,et al.  Nonbinary LDPC Coding for Multicarrier Underwater Acoustic Communication , 2008, IEEE Journal on Selected Areas in Communications.

[22]  M. Stojanovic,et al.  Adaptive MIMO detection of OFDM signals in an underwater acoustic channel , 2008, OCEANS 2008.

[23]  Shengli Zhou,et al.  Sparse channel estimation for multicarrier underwater acoustic communication: From subspace methods to compressed sensing , 2009, OCEANS 2009-EUROPE.