A Comparative Study of Spread OFDM with Transmit Diversity for Underwater Acoustic Communications

This paper compares the effectiveness of different spread OFDM techniques with transmit diversity used for underwater acoustic communications. Spreading by Walsh-Hadamard codes, discrete Fourier transform, discrete cosine transform and carrier interferometry (CI) codes have been combined with the application of space-time and space-frequency transmit diversity in OFDM for underwater acoustic communication. The spreading technique helps overcome frequency-selective and multipath fading and also provides reduced peak-to-average power ratio (PAPR). The application of space time and space frequency coding techniques improves the data rate and reliability of the spread OFDM scheme in terms of bit error rate (BER). Simulation results show that all the spread OFDM schemes show better BER performance in underwater environment when transmit diversity schemes are used. CI spread OFDM with space-frequency block coding shows a BER of $$1\times 10^{-6}$$1×10-6 at a signal-to-noise ratio (SNR) of $$13.6$$13.6 dB and is proposed as one of the best scheme. This gain in SNR may be used to further increase the data transmission rate.

[1]  Milica Stojanovic,et al.  Shallow water acoustic networks , 2001, IEEE Commun. Mag..

[2]  Milica Stojanovic,et al.  Underwater acoustic communication channels: Propagation models and statistical characterization , 2009, IEEE Communications Magazine.

[3]  S. Nishifuji,et al.  On-line sensing system of dynamic ship’s attitude by use of servo-type accelerometers , 1995, IEEE Journal of Oceanic Engineering.

[4]  Hou Chunping,et al.  A Novel Method Based DCT to Reduce PAPR of OFDM Systems , 2008, 2008 4th International Conference on Wireless Communications, Networking and Mobile Computing.

[5]  Prashant Kumar,et al.  Performance evaluation of modified OFDM for underwater communications , 2013, 2013 IEEE International Conference on Communications Workshops (ICC).

[6]  Michael D. Zoltowski,et al.  Performance evaluation of Code-Spread OFDM using Vandermonde spreading , 2009, 2009 IEEE Radio and Wireless Symposium.

[7]  Siavash M. Alamouti,et al.  A simple transmit diversity technique for wireless communications , 1998, IEEE J. Sel. Areas Commun..

[8]  Mari Carmen Domingo,et al.  Overview of channel models for underwater wireless communication networks , 2008, Phys. Commun..

[9]  D. Wiegandt,et al.  The elimination of peak-to-average power ratio concerns in OFDM via carrier interferometry spreading codes: a multiple constellation analysis , 2004, Thirty-Sixth Southeastern Symposium on System Theory, 2004. Proceedings of the.

[10]  Prashant Kumar,et al.  Performance Evaluation of DFT-Spread OFDM and DCT-Spread OFDM for Underwater Acoustic Communication , 2012, 2012 IEEE Vehicular Technology Conference (VTC Fall).

[11]  N. Ahmed,et al.  Discrete Cosine Transform , 1996 .

[12]  Haixin Sun,et al.  An Underwater Acoustic Implementation of DFT-Spread OFDM , 2010, EURASIP J. Adv. Signal Process..

[13]  Adam Zielinski,et al.  Performance analysis of digital acoustic communication in a shallow water channel , 1995, IEEE Journal of Oceanic Engineering.

[14]  Jae Hong Lee,et al.  An overview of peak-to-average power ratio reduction techniques for multicarrier transmission , 2005, IEEE Wireless Communications.

[15]  K. Wesolowski,et al.  WHT/OFDM - an improved OFDM transmission method for selective fading channels , 2000, IEEE Benelux Chapter on Vehicular Technology and Communications. Symposium on Communications and Vehicular Technology. SCVT-2000. Proceedings (Cat. No.00EX465).

[16]  Michele Zorzi,et al.  Underwater Acoustic Networking Techniques , 2012, Springer Briefs in Electrical and Computer Engineering.

[17]  Preetam Kumar,et al.  Overloaded WH-Spread CI/MC-CDMA with Iterative Interference Cancellation , 2011, IEEE Communications Letters.

[18]  Fang Xu,et al.  A Novel Implementation of Carrier Interferometry OFDM in an Underwater Acoustic Channel , 2007, OCEANS 2007 - Europe.