Study on Time Reversal Maximum Ratio Combining in Underwater Acoustic Communications
| Autor: | Caigao Zeng, Anbang Zhao, Juan Hui, Kaiyu Tang, Keren Wang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Noise power
Computer science Acoustics time reversal 01 natural sciences lcsh:Technology maximum ratio combining Reduction (complexity) lcsh:Chemistry focusing gain 0103 physical sciences General Materials Science Maximal-ratio combining Received noise power Underwater 010301 acoustics Instrumentation lcsh:QH301-705.5 0105 earth and related environmental sciences Computer Science::Information Theory Fluid Flow and Transfer Processes 010505 oceanography lcsh:T underwater acoustic communications Process Chemistry and Technology General Engineering Antenna diversity lcsh:QC1-999 Computer Science Applications weight coefficient lcsh:Biology (General) lcsh:QD1-999 lcsh:TA1-2040 Bit error rate lcsh:Engineering (General). Civil engineering (General) Multipath propagation lcsh:Physics |
| Zdroj: | Applied Sciences Volume 11 Issue 4 Applied Sciences, Vol 11, Iss 1509, p 1509 (2021) |
| ISSN: | 2076-3417 |
| DOI: | 10.3390/app11041509 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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