PN Sequence based Underwater Acoustic Orthogonal Signal-Division Multiplex Communication System

Orthogonal signal division multiplexing (OSDM) is an emerging technology for signal modulation. It is a method to ease the contradiction between subcarrier flexibility and PAPR. Particularly, it can be viewed as a bridge between single-carrier and orthogonal frequency division multiplexing (OFDM) from frequency domain. In this paper, OSDM method is adopted in underwater acoustic (UWA) communication system. Meanwhile, in order to solve the influence of underwater acoustic channel which has large time delay, strong multipath and Doppler characters, a data frame structure with PN sequence is designed. PN sequence is used to do channel decision feedback equalization (DFE) and Doppler estimation. Finally, the proposed system is verified by simulation. When the length of the OSDM vector is bigger than the channel length, the BER of OSDM system is lower than OFDM system. The simulation results show that PN sequence based OSDM system proposed in this paper has capability to resist multipath and Doppler and good performance to overcome underwater acoustic channel.

[1]  Miaowen Wen,et al.  Vector OFDM With Index Modulation , 2017, IEEE Access.

[2]  Sundeep Prabhakar Chepuri,et al.  Iterative Per-Vector Equalization for Orthogonal Signal-Division Multiplexing Over Time-Varying Underwater Acoustic Channels , 2019, IEEE Journal of Oceanic Engineering.

[3]  Han Han,et al.  NC-OSDM transmission for ICI cancelation in high speed mobile systems , 2009, 2009 Second International Workshop on Cognitive Radio and Advanced Spectrum Management.

[4]  L. Freitag,et al.  Non-Uniform Doppler Compensation for Zero-Padded OFDM over Fast-Varying Underwater Acoustic Channels , 2007, OCEANS 2007 - Europe.

[5]  Milica Stojanovic,et al.  Underwater Acoustic Communications and Networking: Recent Advances and Future Challenges , 2008 .

[6]  Xiang-Gen Xia.  Precoded and vector OFDM robust to channel spectral nulls and with reduced cyclic prefix length in single transmit antenna systems , 2001, IEEE Trans. Commun..

[7]  Burton R. Saltzberg,et al.  Multi-Carrier Digital Communications: Theory and Applications of Ofdm , 1999 .

[8]  Meixia Tao,et al.  V-OFDM: On Performance Limits over Multi-Path Rayleigh Fading Channels , 2011, IEEE Transactions on Communications.

[9]  Jie Zhang,et al.  PN sequence based Doppler and channel estimation for underwater acoustic OFDM communication , 2016, 2016 IEEE International Conference on Signal Processing, Communications and Computing (ICSPCC).

[10]  Guillem Rojo,et al.  Peak-to-Average Power Ratio Reduction for Acoustic Orthogonal Frequency Division Multiplexing Systems , 2010 .

[11]  Ahmad Bahai,et al.  Multi-carrier digital communications , 1999 .

[12]  Geert Leus,et al.  Space-Time and Space-Frequency Block Coded Vector OFDM Modulation , 2017, IEEE Communications Letters.

[13]  Koichi Mizutani,et al.  Underwater Acoustic Communication With an Orthogonal Signal Division Multiplexing Scheme in Doubly Spread Channels , 2014, IEEE Journal of Oceanic Engineering.

[14]  Geert Leus,et al.  Doppler-Resilient Orthogonal Signal-Division Multiplexing for Underwater Acoustic Communication , 2016, IEEE Journal of Oceanic Engineering.