Spread spectrum index multiple access underwater acoustic communication

2021 ◽  
Author(s):  
Xiaoting Chen ◽  
Nian Wang ◽  
Dawei Ding ◽  
Gongquan Zhang ◽  
Pu Yan ◽  
...  
Keyword(s):  
Acoustic Communication ◽  
Spread Spectrum ◽  
Multiple Access ◽  
Underwater Acoustic Communication ◽  
Underwater Acoustic

scholarly journals M-ary nonlinear sine chirp spread spectrum for underwater acoustic communication based on virtual time-reversal mirror method

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Songzuo Liu ◽  
Habib Hussain Zuberi ◽  
Yi Lou ◽  
Muhmmad Bilal Farooq ◽  
Shahabuddin Shaikh ◽  
...  
Keyword(s):  
Acoustic Communication ◽  
Time Reversal ◽  
Spread Spectrum ◽  
Underwater Acoustic Communication ◽  
Half Cycle ◽  
Spreading Factor ◽  
Underwater Acoustic ◽  
Virtual Time ◽  
Chirp Spread Spectrum ◽  
Time Reversal Mirror

AbstractLinear chirp spread spectrum technique is widely used in underwater acoustic communication because of their resilience to high multipath and Doppler shift. Linear frequency modulated signal requires a high spreading factor to nearly reach orthogonality between two pairs of signals. On the other hand, nonlinear chirp spread spectrum signals can provide orthogonality at a low spreading factor. As a result, it improves spectral efficiency and is more insensitive to Doppler spread than the linear counterpart. To achieve a higher data rate, we propose two variants (half cycle sine and full cycle sine) of the M-ary nonlinear sine chirp spread spectrum technique based on virtual time-reversal mirror (VTRM). The proposed scheme uses different frequency bands to transmit chirp, and VTRM is used to improve the bit error rate due to high multipath. Its superior Doppler sensitivity makes it suitable for underwater acoustic communication. Furthermore, the proposed method uses a simple, low-power bank of matched filters; thus, it reduces the overall system complexity. Simulations are performed in different underwater acoustic channels to verify the robustness of the proposed scheme.

Deep Learning-Based Code Index Modulation Spread Spectrum Underwater Acoustic Communication

2021 ◽  
Author(s):  
Gang Qiao ◽  
Yufei Liu ◽  
Feng Zhou ◽  
Suleman Mazhar ◽  
Yunjiang Zhao ◽  
...  
Keyword(s):  
Deep Learning ◽  
Acoustic Communication ◽  
Spread Spectrum ◽  
Underwater Acoustic Communication ◽  
Underwater Acoustic ◽  
Index Modulation

The application of differential spread spectrum technology in underwater acoustic communication

2012 ◽  
Vol 132 (3) ◽  
pp. 2015-2015
Author(s):  
Xiao Han ◽  
Jingwei Yin ◽  
Pengyu Du ◽  
Xiaoyu Guo
Keyword(s):  
Acoustic Communication ◽  
Spread Spectrum ◽  
Underwater Acoustic Communication ◽  
Underwater Acoustic

Covet underwater acoustic communication based on spread spectrum orthogonal frequency division multiplexing (OFDM)

2017 ◽  
Vol 141 (5) ◽  
pp. 3990-3990
Author(s):  
Shaofan Yang ◽  
Zhongyuan Guo ◽  
Shengming Guo ◽  
Ning Jia ◽  
Dong Xiao ◽  
...  
Keyword(s):  
Acoustic Communication ◽  
Spread Spectrum ◽  
Orthogonal Frequency Division Multiplexing ◽  
Underwater Acoustic Communication ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Underwater Acoustic
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