The study of adaptive time reversal mirror as a crosstalk mechanism for underwater communication

2015 ◽  
Vol 137 (4) ◽  
pp. 2239-2239
Author(s):  
Yi-Wei Lin
Keyword(s):  
Time Reversal ◽  
Underwater Communication ◽  
Adaptive Time ◽  
Time Reversal Mirror

Time Reversal Processing Effect on Foci Structure in a Dynamic Ocean Waveguide

2007 ◽  
Vol 23 (3) ◽  
pp. 203-210 ◽  
Author(s):  
Y. S. Chiu ◽  
C.-F. Chen
Keyword(s):  
Time Reversal ◽  
Communication Systems ◽  
Underwater Communication ◽  
Signal Distortion ◽  
Acoustical Properties ◽  
Ocean Environment ◽  
Time Reversal Mirror ◽  
Optimal Approach ◽  
Focal Structures ◽  
Message Signal

AbstractTime-reversal mirror (TRM) was recently developed for underwater communication system application. This technique has been introduced as an approach to compensate for signal distortion due to multiple path effect in ocean waveguide. TRM is used in this paper for sending a message signal in ocean waveguide, received at time-reversal-array (TRA), and retransmitted to the dynamic ocean environment with an internal solitary wave. The focal structures obtained from different simulating cases are used for bidirectional transmission expediency, and the TRA is used as the relay-line or trunked radio. Ocean waveguide characteristic effects on acoustical properties are also shown in this paper, and focal structure in different ocean environments is analyzed to provide an optimal approach to underwater communication systems and for physical insight's interests.

Adaptive time-reversal mirror

2001 ◽  
Vol 109 (5) ◽  
pp. 1817-1825 ◽  
Author(s):  
J. S. Kim ◽  
H. C. Song ◽  
W. A. Kuperman
Keyword(s):  
Time Reversal ◽  
Adaptive Time ◽  
Time Reversal Mirror

Multiple focusing with adaptive time-reversal mirror

2004 ◽  
Vol 115 (2) ◽  
pp. 600-606 ◽  
Author(s):  
J. S. Kim ◽  
K. C. Shin
Keyword(s):  
Time Reversal ◽  
Adaptive Time ◽  
Time Reversal Mirror

Multiple focusing with adaptive time‐reversal mirror

2002 ◽  
Vol 112 (5) ◽  
pp. 2447-2447 ◽  
Author(s):  
J. S. Kim ◽  
K. C. Shin
Keyword(s):  
Time Reversal ◽  
Adaptive Time ◽  
Time Reversal Mirror

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.

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