In offshore oil exploitation, autonomous calbleless control and monitoring systems could have large economical advantages over the systems with electrical and hydraulic underwater umbilical; underwater acoustic communication system are the best choice to implement a cableless communication system suitable to the expected setups at the subsea oil production systems. The main points at these systems are the communication reliability and the hardware reliability. Usually the control or monitoring systenis could operate at a very low data rate.Typically, these acoustic systems need to operate at horizontal distances ranging from 1 to 10 Km and at water depths from 100 to 2.000 meters. To select the suitable signaling techniques in these fading multipath channel, it is fuidamental to evaluate the distortions introduced in the signal by the channel. Experimental results with some of these configurations, with evaluations of time spreading. frequency spreading, frequency and time coherence and statistical distribution of the fading are presented. The multipath configuration could be evaluated by a ray-tracing software.The main difficult to implement a simple FSK system, even with a low data rate, are the multipath. A modem that can overcome the multipath and intersymbolic interference are proposed, this modem uses a FSK modulation scheme with silence intends (guard intervals). A special symbol synchronization system is also proposed, based on the use of Williard words. Experimental results with this modem at the Brazilian Campos Basin showed promissory results, the proposed system are suitability to operate with an autonomous underwater control or monitoring systems.
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