Spread-Spectrum Method Using Multiple Sequences for Underwater Acoustic Communications

Fengzhong Qu; Xiangzhao Qin; Liuqing Yang; T. C. Yang

doi:10.1109/JOE.2017.2750298

Spread-Spectrum Method Using Multiple Sequences for Underwater Acoustic Communications

Fengzhong Qu, Xiangzhao Qin, Liuqing Yang, T. C. Yang

Research output: Contribution to journal › Article › peer-review

39 Scopus citations

Abstract

Direct-sequence spread-spectrum-based approaches have been adopted in underwater acoustic communications. In this paper, multiple sequences utilizing the periodic correlation characteristics of an original spreading waveform are superimposed, modulating multiple distinct symbols simultaneously within each block at the transmitter. Among those superimposed symbols, one is used as the pilot for channel estimation on chip level and others carry data. Similar to existing superposition schemes, the proposed approach also has low receiver complexity, only requiring matched filtering operations. However, the innovation of the proposed approach is perfect interference suppression, cyclic prefix (CP) is inserted to eliminate the interblock interference totally. Combined CP operation leading to an equivalent cyclic channel matrix with circularly shifted versions of spreading sequences, interferences can be solved considerably. The proposed technique is evaluated with both simulation and experimental data analysis. Data processing gives a brief discussion about low probability of detection and low probability of interception.

Original language	English (US)
Article number	8082501
Pages (from-to)	1215-1226
Number of pages	12
Journal	IEEE Journal of Oceanic Engineering
Volume	43
Issue number	4
DOIs	https://doi.org/10.1109/JOE.2017.2750298
State	Published - Oct 2018
Externally published	Yes

Bibliographical note

Funding Information:
Manuscript received September 17, 2016; revised April 10, 2017 and June 29, 2017; accepted September 2, 2017. Date of publication October 25, 2017; date of current version October 11, 2018. This work was supported in part by the National Natural Science Foundation of China under Grants 61371093 and 61531017; in part by the National Natural Science Foundation of China for Excellent Young Scholars under Grant 61722113; and in part by the Open Project Program of Qingdao National Laboratory for Marine Science and Technology under Grant QNLM2016ORP0112. This work was presented in part at the MTS/IEEE Oceans Conference, Biloxi, MS, USA, Oct. 26–29, 2009. (Corresponding author: Liuqing Yang.) Associate Editor: R. Zheng.

Publisher Copyright:
© 1976-2012 IEEE.

Keywords

Direct-sequence spread spectrum (DSSS)
interference suppression
low probability of detection (LPD) and low probability of interception (LPI)
multiple sequences
periodic correlations

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10.1109/JOE.2017.2750298

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abstract = "Direct-sequence spread-spectrum-based approaches have been adopted in underwater acoustic communications. In this paper, multiple sequences utilizing the periodic correlation characteristics of an original spreading waveform are superimposed, modulating multiple distinct symbols simultaneously within each block at the transmitter. Among those superimposed symbols, one is used as the pilot for channel estimation on chip level and others carry data. Similar to existing superposition schemes, the proposed approach also has low receiver complexity, only requiring matched filtering operations. However, the innovation of the proposed approach is perfect interference suppression, cyclic prefix (CP) is inserted to eliminate the interblock interference totally. Combined CP operation leading to an equivalent cyclic channel matrix with circularly shifted versions of spreading sequences, interferences can be solved considerably. The proposed technique is evaluated with both simulation and experimental data analysis. Data processing gives a brief discussion about low probability of detection and low probability of interception.",

keywords = "Direct-sequence spread spectrum (DSSS), interference suppression, low probability of detection (LPD) and low probability of interception (LPI), multiple sequences, periodic correlations",

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note = "Funding Information: Manuscript received September 17, 2016; revised April 10, 2017 and June 29, 2017; accepted September 2, 2017. Date of publication October 25, 2017; date of current version October 11, 2018. This work was supported in part by the National Natural Science Foundation of China under Grants 61371093 and 61531017; in part by the National Natural Science Foundation of China for Excellent Young Scholars under Grant 61722113; and in part by the Open Project Program of Qingdao National Laboratory for Marine Science and Technology under Grant QNLM2016ORP0112. This work was presented in part at the MTS/IEEE Oceans Conference, Biloxi, MS, USA, Oct. 26–29, 2009. (Corresponding author: Liuqing Yang.) Associate Editor: R. Zheng. Publisher Copyright: {\textcopyright} 1976-2012 IEEE.",

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Spread-Spectrum Method Using Multiple Sequences for Underwater Acoustic Communications

Abstract

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