MIMO GS OVSF/OFDM Based Underwater Acoustic Multimedia Communication Scheme
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An underwater acoustic multimedia communication (UWAMC) system is proposed with 2400 transmission modes according to time-varying multipath underwater acoustic (UWA) channel conditions. The orthogonal variable spreading factor (OVSF) scheme and Gold sequence (GS) scramble code are integrated into multi-input multi-output UWAMC system based on orthogonal frequency-division multiplexing to achieve the quality of service of multimedia transmission in the UWA channel. Binary phase shift keying (BPSK) and quadrature phase shift keying (QPSK) adaptive modulation, direct mapping (DM) or space–time block code (STBC) transmission strategies, convolution channel code with rate 1/2 and 1/3, and a power assignment mechanism were adopted in the proposed system. Simulation results show that the bit error rate (BER) and power saving ratio (PSR) performance of the STBC strategy with transmission diversity is superior to that of the DM strategy without transmission diversity, and the performance of the BERs and PSRs of the transmission scheme with the GS scramble code surpasses that of the scheme without the code. The performance of the BERs and PSRs of BPSK modulation with a channel code rate of 1/3 is better than that of BPSK modulation with a channel code rate of 1/2, and the performances of BERs and PSRs of BPSK modulation with a channel code rate of 1/3 are better than that of QPSK modulation with a channel code rate of 1/3. As the length of the OVSF codes increases, the UWAMC system’s BERs decrease, and its PSRs increase. The UWAMC system can achieve either maximum transmission speed or maximum transmission power efficiency.
KeywordsUnderwater acoustic multimedia communication Orthogonal variable spreading factor Gold sequence Space–time block code Bit error rates Power saving ratios
The authors acknowledge the support of the grant form Ministry of Science and Technology of Taiwan, NSC 99-2923-E-022-001-MY3, MOST-105-2923-E-022-001-MY3, and the valuable comments of the reviewers.
- 7.Chiu, L. Y. S. (邱永盛), Chang, A. (張元櫻), & Chen, C. F. (陳琪芳). (2006). Reviews and aspects of underwater acoustic communication (水下通訊系統回顧與展望,海洋及水). Journal of Ocean and Underwater Technology (海洋及水下科技季刊 ), 16(1), 22–39.Google Scholar
- 8.Zhou, G., Shim, T., & Shim, T. (2007). Adaptive transmission technique in underwater acoustic wireless communication. In L. Kang, Y. Liu, & S. Zeng (Eds.), LNCS (Vol. 4684, pp. 268–276). Berlin: Springer.Google Scholar
- 12.Lin, C. F. (林進豐), Chang, S. H. (張順雄), & Invan, A. P. (2014). Advanced underwater communication technology (先進水下通訊技術). Journal of Ocean and Underwater Technology (海洋及水下科技季刊), 24(3), 27–33.Google Scholar
- 18.Cheng, X., Cheng, X., Yang, L., & Cheng, X. (2016). Cooperative OFDM underwater acoustic communications (pp. 1–12). Switzerland: Springer.Google Scholar
- 22.Qu, F., Wang, Z., & Yang, L. (2017). Differential orthogonal space-time block coding modulation for time-variant underwater acoustic channels. IEEE Journal Oceanic Engineering, 42(1), 188–198.Google Scholar
- 27.Lin, C. F., Chen, J. Y., Yu, Y. J., Yan, J. T., & Chang, S. H. (2010). Direct mapping OVSF-based transmission scheme for underwater acoustic multimedia communication. Journal of Marine Science and Technology, 18(3), 413–418.Google Scholar
- 33.Lin, C. F., Shih, C. H., Chen, C. P., Leu, S. W., Wu, J. K., Tseng, C. H., et al. (2009). An OFDM-based transmission scheme for underwater acoustic multimedia. WSEAS Transactions on Communications, 3(8), 343–352.Google Scholar
- 35.Emre, Y., Kandasamy, V., Duman, T. M., Hursky, P., & Roy, S. (2008). Multi-input multi-output OFDM for shallow-water UWA communications. In Acoustics conference (pp. 5334–5338).Google Scholar
- 42.Hwang, S. Y, Park, G. Y, Park, H. J, & Jhang, K. S. (2008). An improved implementation method of the gold sequence generator. In IEEE international symposium on consumer electronics. Google Scholar
- 43.Zhang, J., Zheng, Y. R., et al. (2008). Frequency-domain equalization for single carrier MIMO underwater acoustic communications. In MTS/IEEEOcean’08.Google Scholar