scholarly journals Time-Reversal and Spatial Diversity: Issues in a Time-Varying Geometry Test

2004 ◽  
Author(s):  
S. M. Jesus
Keyword(s):  
Time Reversal ◽  
Spatial Diversity ◽  
Time Varying ◽  
Diversity Issues ◽  
Geometry Test

scholarly journals Study on Time Reversal Maximum Ratio Combining in Underwater Acoustic Communications

2021 ◽  
Vol 11 (4) ◽  
pp. 1509
Author(s):  
Anbang Zhao ◽  
Caigao Zeng ◽  
Juan Hui ◽  
Keren Wang ◽  
Kaiyu Tang
Keyword(s):  
Time Reversal ◽  
Signal To Noise Ratio ◽  
Spatial Diversity ◽  
Single Element ◽  
Noise Power ◽  
Theoretical Derivation ◽  
Underwater Acoustic ◽  
Maximum Ratio Combining ◽  
Weight Coefficients ◽  
Output Snr

Time reversal (TR) can achieve temporal and spatial focusing by exploiting spatial diversity in complex underwater environments with significant multipath. This property makes TR useful for underwater acoustic (UWA) communications. Conventional TR is realized by performing equal gain combining (EGC) on the single element TR output signals of each element of the vertical receive array (VRA). However, in the actual environment, the signal-to-noise ratio (SNR) and the received noise power of each element are different, which leads to the reduction of the focusing gain. This paper proposes a time reversal maximum ratio combining (TR-MRC) method to process the received signals of the VRA, so that a higher output SNR can be obtained. The theoretical derivation of the TR-MRC weight coefficients indicates that the weight coefficients are only related to the input noise power of each element, and are not affected by the multipath structure. The correctness of the derivation is demonstrated with the experimental data of the long-range UWA communications conducted in the South China Sea. In addition, the experimental results illustrate that compared to the conventional TR, TR-MRC can provide better performance in terms of output SNR and bit error rate (BER) in UWA communications.

scholarly journals Spatial diversity in passive time reversal communications

2006 ◽  
Vol 120 (4) ◽  
pp. 2067-2076 ◽  
Author(s):  
H. C. Song ◽  
W. S. Hodgkiss ◽  
W. A. Kuperman ◽  
W. J. Higley ◽  
K. Raghukumar ◽  
...  
Keyword(s):  
Time Reversal ◽  
Spatial Diversity

Joint Time-Reversal Processing and Spatial Diversity for Distributed Target Detection in Shallow Water

2010 ◽  
Author(s):  
Chunxiao Li ◽  
Xiang Pan ◽  
Mingfei Guo ◽  
Jeffrey Simmen ◽  
Ellen S. Livingston ◽  
...  
Keyword(s):  
Shallow Water ◽  
Target Detection ◽  
Time Reversal ◽  
Spatial Diversity ◽  
Distributed Target
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