%0 Journal Article %T Performance Optimization of Underwater Communication Links at Different Ranges for AIS Relay to AUV %+ Département Mathematical and Electrical Engineering (IMT Atlantique - MEE) %+ Ecole Navale (EN) %+ Equipe Communication System Design (Lab-STICC_COSYDE) %A Imbert, Stephane %A Laot, Christophe %A Boudraa, Abdel-Ouahab %A Szkolnik, Jean-Jacques %< avec comité de lecture %@ 2076-3417 %J Applied Sciences %I MDPI %V 12 %8 2022-04-20 %D 2022 %R 10.3390/app12094166 %K AUV %K MC-SS %K underwater acoustic communications %K AIS %K Doppler filter bank %K security %K adaptive bit rate %K 2D spreading %Z Computer Science [cs]/Networking and Internet Architecture [cs.NI]Journal articles %X Autonomous Underwater Vehicles (AUVs) are becoming increasingly popular for largenumber of civil and military applications, such as environmental monitoring, oceanography, archae-ology, or mine warfare. Operational safety issue still prevents the exploitation of the full potential ofAUVs. Operations of AUVs are limited by constraints including the need to guarantee no collisionwith manned surface vehicles. To avoid collisions, a solution is to relay surface vessel positions to theAUVs by an underwater communication link. The communication must be optimized to establish arobust and reliable link at various range and depth. Commercial underwater acoustic modems areoften dedicated for specific distances and bit rates with performances strongly dependent on theenvironmental conditions. For the considered application, the modem must be adaptive at the timeand frequency selectivity of the channel which is varying according to the operation context. In thiswork, we propose an adaptive underwater acoustic waveform optimized to exploit at the best thetime and frequency diversity the channel. To show the potential gain obtained by using diversity, theperformance of the designed modem is evaluated using theoretical and realistic underwater channels.In addition, we propose a method for adapting the waveform based only on the knowledge of thetransmission geometry. Finally, the proposed modem is tested to relay Automatic IdentificationSystems (AIS) picture of an area to AUVs. %G English %2 https://imt-atlantique.hal.science/hal-03684299/document %2 https://imt-atlantique.hal.science/hal-03684299/file/applsci-12-04166-v2%20-%20Version%20publi%C3%A9e.pdf %L hal-03684299 %U https://imt-atlantique.hal.science/hal-03684299 %~ UNIV-BREST %~ INSTITUT-TELECOM %~ CNRS %~ UNIV-UBS %~ LORIA2 %~ ENIB %~ LAB-STICC %~ LAB-STICC_IMTA %~ IMT-ATLANTIQUE %~ PRACOM %~ INSTITUTS-TELECOM %~ IMTA_MEE %~ LAB-STICC_COSYDE_IMTA %~ LAB-STICC_COSYDE %~ LAB-STICC_T2I3