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Aiming at the problem of traditional orthogonal frequency division multiplexing (OFDM) communication system performance degradation when the channel is subjected to complex multi-path and frequency-selective deeply fading, a chirp spread spectrum (CSS) of OFDM underwater acoustic communication system called CSS-OFDM is proposed in this paper. The CSS-OFDM system spreads the spectrum of traditional OFDM signals, whose sub-carriers are modulated into the same chirp rate, different center frequency orthogonal chirp signals with overlapped bandwidth. Dispreading after underwater acoustic coherent multi-path channel, at the receiving end, the multi-path signals will be expanded from each other in the frequency domain. Applying virtual time reversal mirror technology, the energies of the multi-path signals are focused to complete the multi-path channel diversity receiving. The system performance is improved not only by suppressing the frequency selective fading, but also taking full advantage of multi-path energy of the channel. The effectiveness and reliability of this system are verified through a number of simulations and lake trials.
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Keywords:
- orthogonal frequency division multiplexing /
- frequency-selective fading /
- chirp spread spectrum /
- multi-path diversity receive
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[13] Kuperman W A, Hodgkiss W S, Song H C, Akal T, Ferla C, Jackson D R 1998 J. Acoust. Soc. Am. 103 25
[14] Yin J W, Hui J Y, Guo L X 2008 Acta Phys. Sin. 57 1753 (in Chinese) [殷敬伟, 惠俊英, 郭龙祥 2008 物理学报 57 1753]
[15] Hursky P, Porter M B, Siderius M, McDonald V K 2006 J. Acoust. Soc. Am. 120 247
[16] Song A, Badiey M, Song H C, Hodgkiss W S 2010 J. Acoust. Soc. Am. 128 555
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[1] Kilfoyle D B, Baggeroer A B 2000 IEEE J. Ocean Eng. 25 4
[2] Stojanovic M, Preisig J 2009 IEEE Commun. Mag. 47 84
[3] Lei J, Wu L N 2006 J. Electron. Inform. Technol. 28 1400 (in Chinese) [雷俊, 吴乐南 2006 电子与信息学报 28 1400]
[4] Jamshidi A 2011 IET Commun. 5 456
[5] He C B, Huang J G, Han J, Zhang Q F 2009 Acta Phys. Sin. 58 8379 (in Chinese) [何成兵, 黄建国, 韩晶, 张群飞 2009 物理学报 58 8379]
[6] Yin J W, Hui J Y, Wang Y L, Hui J 2007 Acta Phys. Sin. 56 5915 (in Chinese) [殷敬伟, 惠俊英, 王逸林, 惠娟 2007 物理学报 56 5915]
[7] Yu Y, Zhou F, Qiao G 2012 Acta Phys. Sin. 61 234301 (in Chinese) [于洋, 周锋, 乔钢 2012 物理学报 61 234301]
[8] Hara S, Prasad R 1997 IEEE Commun. Mag. 35 126
[9] Yu Y, Zhou F, Qiao G 2013 Acta Phys. Sin. 62 064302 (in Chinese) [于洋, 周锋, 乔钢 2013 物理学报 62 064302]
[10] Zhou F, Yin Y L, Qiao G 2012 J. Harbin Eng. Univ. 33 567 (in Chinese) [周锋, 尹艳玲, 乔钢 2012 哈尔滨工程大学学报 33 567]
[11] Yin Y L, Zhou F, Qiao G, Liu S Z 2013 Acta Phys. Sin. 62 224302 (in Chinese) [尹艳玲, 周锋, 乔钢, 刘凇佐 2013 物理学报 62 224302]
[12] Scholand T, Faber T, Seebens A, Lee J, Cho J, Cho Y, Lee H W, Jung P 2005 Electron. Lett. 41 13
[13] Kuperman W A, Hodgkiss W S, Song H C, Akal T, Ferla C, Jackson D R 1998 J. Acoust. Soc. Am. 103 25
[14] Yin J W, Hui J Y, Guo L X 2008 Acta Phys. Sin. 57 1753 (in Chinese) [殷敬伟, 惠俊英, 郭龙祥 2008 物理学报 57 1753]
[15] Hursky P, Porter M B, Siderius M, McDonald V K 2006 J. Acoust. Soc. Am. 120 247
[16] Song A, Badiey M, Song H C, Hodgkiss W S 2010 J. Acoust. Soc. Am. 128 555
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