Underwater communication uses acoustic waves instead of electromagnetic waves.įuture ocean environment will be increasingly complicated. Most commonly employed using hydrophones.ĭifficult due to factors like multi-path propagation, time variations of the channel, small available bandwidth and strong signal attenuation. Technique of sending and receiving message below water. Current research focuses on the development of efficient signal processing algorithms, multiuser communications in the presence of interference, and design of efficient modulation and coding schemes. The communication scenario in which the modern UWA systems will operate is that of an underwater network consisting of stationary and mobile nodes. The new generation of underwater communication systems employing phase-coherent modulation techniques will achieve at least a tenfold increase in data throughput. However, to achieve high data rates on the severely band limited UWA channels, bandwidth-efficient modulation techniques must be considered, together with array processing for exploitation of spatial multipath diversity. Until recently, the design of communication systems has mostly relied on the use of no coherent modulation techniques. UWA communications are made difficult by the combined effect of multipath propagation and high temporal and spatial variability of the channel conditions. Sivaranjani Assistant professor Dept of ECE-PITSĪbstract: -In recent years, underwater acoustic (UWA) communications have received much attention as their applications are beginning to shift from military towards commercial.
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