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http://dx.doi.org/10.7776/ASK.2012.31.1.001

Equalizer Mode Selection Method for Improving Bit Error Performance of Underwater Acoustic Communication Systems  

Kim, Hyeon-Su (인하대학교 전자공학과)
Seo, Jong-Pil (인하대학교 전자공학과)
Kim, Jae-Young (인하대학교 전자공학과)
Kim, Seong-Il (국방과학연구소)
Chung, Jae-Hak (인하대학교 전자공학과)
Publication Information
The Journal of the Acoustical Society of Korea / v.31, no.1, 2012 , pp. 1-10 More about this Journal
Abstract
The linear and decision-feedback equalization can mitigate time-varying intersymbol interference (ISI) caused by time-varying multipath propagation for underwater acoustic channels. The perfect elimination of interference components, however, is difficult using the linear equalization and the decision feedback equalizer has an error propagation problem. To overcome these shortcomings, this paper proposes an equalizer mode selection method using training sequences. The proposed method selects an equalization mode corresponding to the signal-to-noise ratio (SNR). If the SNR is low, the proposed system operates the linear equalizer for preventing the error propagation and if the SNR is high, the decision feedback equalizer for eliminating the residual ISI. Therefore, the proposed method can improve the error performance compared to the conventional equalizers. The computer simulation shows the proposed method improves the bit error performance using practical underwater channels responses acquired from the sea experiment.
Keywords
Adaptive signal processing; Channel equalization; Underwater acoustic communication; Decision-feedback equalizer; Linear equalizer;
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Times Cited By KSCI : 1  (Citation Analysis)
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1 J. Tao, Y. Zheng, C. Xiao, and T. Yang, "Robust MIMO Underwater Acoustic Communications Using Turbo Block Decision-Feedback Equalization," IEEE J. Ocean. Eng., vol. 35, no. 4, Oct. 2010.
2 J. Choi, T. Riedl, K. Kim, A. Singer, and J. Preisig, "Adaptive Linear Turbo Equalization Over Doubly Selective Channels," IEEE J. Ocean. Eng., vol. 36, no. 4, Oct. 2011.
3 T. C. Yang, "Differences between passive-phase conjugation and decision-feedback equalizer for underwater acoustic communications," IEEE J. Ocean. ENG., vol. 29, no. 2, Apr. 2004.
4 Antoni Fertner, "Improvement of bit-error-rate in decision feedback equalizer by preventing decisionerror propagation," IEEE Trans. Signal Processing, vol. 46, no. 7, Jul. 1998.
5 J. Proakis, and M. Salehi, Digital communications, fifth edition, McGraw-Hill, New York, 2008.
6 J. A. Catipovic, "Performance limitations in underwater acoustic telemetry," IEEE J. Ocean. Eng., vol. 15, no. 3, pp. 205-216, Jul. 1990.   DOI   ScienceOn
7 D. B. Kilfoyle and A. B. Baggeroer, "The state of the art in underwater acoustic telemetry," IEEE J. Ocean. Eng., vol. 25, no. 1, pp. 1-25, Jan. 2000.
8 Berard Sklar, Digital Communications, fundamentals and applications second edition, Prentice-Hall International, Inc., 2001.
9 M. Stojanovic, J. Catipovic, and J. Proakis, "Phasecoherent digital communications for underwater acoustic channels," IEEE J. Ocean. Eng., vol. 19, pp. 100-111, Jan. 1994.   DOI   ScienceOn
10 M. Kocic, D. Brady, and M. Stojanovic, "Sparse equalization for real-time digital underwater acoustic communications," in Proc. IEEE OCEANS Conf., San Diego, CA, vol. 3, pp. 1417-1422, Oct. 1995.
11 김현수, 최동현, 서종필, 정재학, 김성일, "동해 연근해에서 위상 추정기를 갖는 적응형 등화기의 실험적 성능 검증", 한국음향학회지, 29권, 4호, 229-236쪽, 2010.   과학기술학회마을
12 L. Freitag, M. Johnson, and M. Stojanovic, "Efficient equalizer update algorithms for acoustic communication channels of varying complexity," in Proc. IEEE OCEANS Conf., Halifax, NS, Canada, vol. 1, pp. 580-585, Oct. 1997.
13 M. Stojanovic, L. Freitag, and M. Johnson, "Channelestimation- based adaptive equalization of underwater acoustic signals," in Proc. IEEE OCEANS Conf., Sep. 1999, vol. 2, pp. 590-595.
14 M. J. Lopez and A. C. Singer, "A DFE coefficient placement algorithm for sparsed reverberant channels," IEEE Trans. Comm., vol. 49, no. 8, pp. 1334-1338, Aug. 2001.   DOI   ScienceOn