Experimental Study of Long-Range Shallow Water Acoustic Communication Based on OFDM-Modem

Abstract:

In this paper, we focus on the need for remote and robust underwater acoustic(UWA) communication in shallow sea. A set of OFDM underwater acoustic communication algorithm is designed including the techniques of Doppler estimation and compensation, channel equalization and frequency diversity. This algorithm is realized in the DSP and successfully applied on the OFDM-Modem platform. In Da- Lian shallow sea trial, the horizontal communication distance is 36 kilometers under the condition of QPSK modulation, 1/2 rate convolution code, bandwidth between 4 and 8kHz. The communication rate of the OFDM-Modem can reach 426bps and the ultimate BER is less than 10-3.

• Periodical: Advanced Materials Research (Volumes 546-547)
• Pages: 1308-1313
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.546-547.1308
• Online since: July 2012
• Authors: Gang Qiao, Song Zuo Liu, Feng Zhou, Zong Xin Sun
• Keywords: Frequency Division, Long Range Communication, Orthogonal Frequency Division Multiplexing (OFDM), Shallow Sea Communication, Underwater Modem

References

[1] M Stojanovic, J Presig. Underwater Acoustic Communication Channels: Propagation Models and Statistical Characterization. IEEE Communications Magazine, January 2009: 84-89P.

DOI: 10.1109/mcom.2009.4752682

[2] LinkQuest, Inc. SoundLink Underwater Acoustic Modems. Available at http: /www. link-quest. com.

[3] DSPComm, Inc. Underwater wireless modems. Available at http: /www. dspcomm. com.

[4] Freitag L, Grund M, Singh S, Partan J, Koski P, Ball K. The WHOI Micro-Modem: An Acoustic Communcations and Navigation System for Multiple Platforms. in IEEE Oceans Conference, Washington DC, (2005).

DOI: 10.1109/oceans.2005.1639901

[5] M Aydinlik, A Ozdemir, M Stojanovic. A Physical Layer Implementation on Reconfigurable Underwater Acoustic Modem[C]/Proceedings IEEE Oceans'08 Conference, Quebec City, Canada, 2008：1-4.

DOI: 10.1109/oceans.2008.5152044

[6] Ethem M Sözer, Milica Stojanovic. Reconfigurable acoustic modem for underwater sensor networks. Proc. of WUWNET06 workshop, Los Angeles, CA, USA, Sep (2006).

DOI: 10.1145/1161039.1161060

[7] H Yan, S Zhou, Z Shi, B Li. A DSP Implementation of OFDM Acoustic Modem. Proc. of the ACM International Workshop on Underwater Networks (WUWNet), Montreal, Quebec, Canada, September 14, (2007).

DOI: 10.1145/1287812.1287831

[8] Hai Yan, Shengli Zhou, Zhijie Shi. DSP implementation of SISO and MIMO OFDM acoustic modems. OCEANS 2010 IEEE - Sydney. 2010. 1-6.

DOI: 10.1109/oceanssyd.2010.5603887

[9] XU Xiao-ka. The key technology study of high speed shadow sea underwater acoustic communication based on OFDM. Doctoral dissertation of Harbin engineering university. 2009. 29.