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In this paper, deployment strategies of underwater sensor nodes and gateway nodes for two-dimensional communication architecture in Underwater Acoustic Wireless Sensor Networks (UWSNs) are proposed. In the sensor deployment strategy, underwater sensor nodes are deployed in two rows along the coastline, which is of complete coverage and connectivity, localization available and scalable. In the gateway...
The traditional Dectecion of Envelope Modulation on Noise (DEMON) method is difficult to obtain the modulation characteristics when the signal modulation frequency or depth changes with time. For non-stationary modulation characteristics, a modified method ‘HDEMON’ based on Hilbert-Huang Transform (HHT) is given. HDEMON is available for non-stationary mudulation due to its adaptivity and applicability...
To solve the problem that the convergence performance of classical adaptive filtering algorithms is sensitive to input signal power and is hard to balance between convergence speed and steady-state misadjustment, this paper, based on the traditional Frequency-domain Block LMS (FBLMS) algorithm, presents a variable step algorithm which step with easy and reliable parameter tuning is controlled by current...
The coverage and connectivity are important standards of the sensor deployment strategies in Underwater Acoustic Wireless Sensor Networks(UWSNs). In this paper, we mainly research on the deployment of underwater sensors in UWSNs. The advantages and disadvantages of some existing algorithms are analysed and an improved algorithm is provided, which can achieve the complete coverage and connectivity...
The life time of network is an important performance of Underwater Acoustic Networks(UWAN). The target of energy-saving technology is to improve the energy efficiency and prolong the life time. In this paper, energy-saving strategies in Data Link Layer are mostly discussed. Some existing MAC protocols are studied, the advantages and disadvantages of which are analyzed. Then an improved protocol is...
Congestion control is the key technology to ensure quality of network service. In underwater acoustic communication networks an important research area is how to control network congestion. Once detect the network congestion, we should take measures to solve congestion and make network return to normal data transmission. In this paper, we use congestion controller to solve network congestion problems...
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