Opportunistic Transmission in IoUT Networks

Abstract

AbstractUnderwater channels are considered challenging media in communication due to the harsh nature of such environments. However, dynamic transmission can assist in finding sub-optimal solutions by adaptively changing the employed techniques, e.g., the forwarding scheme between nodes, modulation methods, coding parameters (e.g., coding rate), and the transmitted signal intensity control (or transmission power level control), to compromise for the instantaneous fluctuations in various underwater environments. Moreover, opportunistic and cooperative communications are necessary to compensate for the prompt changes in underwater environments.In this chapter, we discuss an opportunistic cooperative transmission scheme for underwater networks that is adaptable for various environmental conditions. The scheme employs the key physical variables of the seawater, e.g., temperature, salinity, density, and wave speed, to indicate the proper relaying scheme jointly with the appropriate modulation method and the transmitting power level that suit the current transmission situations.KeywordsOpportunistic transmissionMultihop cooperative communicationUnderwaterTransmitting power levelChannel modelTransmission lossDirectivity indexSignal intensityForwarding schemesAdaptive modulationTransmission frameworkEfficiency