Nowadays, underwater wireless sensor networks (UWSNs) are known as a powerful technique for aquatic applications. UWNS has long propagation delay, limited bandwidth and higher error rates in comparison with ground based networks. Moreover, a terrestrial wireless communication uses radio waves, but underwater communication relies on acoustic waves. Similar to other wireless sensor networks, desi...

Positioning or Localization, that is, determining the location of every sensor is important and the process aims to have the maximum percentage of localized nodes whether stationary or in motion. This paper elaborates the idea of mining applications in the underwater scenario and also highlights the basic differences between terrestrial sensor networks with the underwater paradigm while explori...

Underwater acoustic wireless sensor networks (UAWSNs) are capable of supporting underwater missions. Due to the unique characteristics of underwater environments e.g. large attenuation and long propagation delay, the transmission range of sensor nodes in UA-WSNs is usually much shorter than that of the terrestrial counterparts, which limits communications between sensors and makes the system in...

Deployment of sensors in the underwater acoustic sensor network is a very challenging task due to the complex 3d environment in underwater sensor networks because acoustic signal is affected by salinity, temperature, and pressure. The main objective of deployment algorithm is to achieve maximum coverage with a minimum number of underwater acoustic sensor nodes or surface gateways in underwater ...

Underwater acoustic communication is widely used in many areas to collect the data from different kinds of sensors deployed underwater or send control information to remote nodes. However, there are many challenges for underwater communication systems because of the characteristics of acoustic propagation in the underwater environment, such as Doppler spread, ambient noise, fading, high propaga...

Sensor technology has matured enough to be used in any type of environment. The appearance of new physical sensors has increased the range of environmental parameters for gathering data. Because of the huge amount of unexploited resources in the ocean environment, there is a need of new research in the field of sensors and sensor networks. This special issue is focused on collecting recent adva...

Time synchronization plays a critical role in distributed network systems. In this paper, we investigate the time synchronization problem in the context of underwater sensor networks (UWSNs). A synchronization algorithm for UWSNs must consider additional factors such as long propagation delays from the use of acoustic communication and sensor node mobility. These unique challenges make the accu...

Applications of underwater sensor networks involve environmental monitoring, disaster prevention, and resource detection. As the importance of these applications has recently grown, underwater sensor networks made up of sensor nodes have to be further investigated. However, little research has been performed to develop an underwater sensor node with communication functionality. In an underwater...

Exploring and monitoring the underwater world using underwater sensors is drawing a lot of attention these days. In this field cooperation between acoustic sensor nodes has been a critical problem due to the challenging features such as acoustic channel failure (sound signal), long propagation delay of acoustic signal, limited bandwidth and loss of connectivity. There are several proposed metho...

In this paper we describe cooperative control algorithms for robots and sensor nodes in an underwater environment. Cooperative navigation is defined as the ability of a coupled system of autonomous robots to pool their resources to achieve long-distance navigation and a larger controllability space. Other types of useful cooperation in underwater environments include: exchange of information su...