This paper presents a novel ultra wideband (UWB) channel model in the 3–10GHz range for body-centric wireless communications. The tests are performed in both indoor anechoic chamber environments, addressing on-body and off-body propagation scenarios. The body channel model is extracted by using a single spatial grid over all the body, and by distinguishing between LOS and NLOS condition. The la...

Topology construction and topology maintenance are significant sub-problems of topology control. Spanning tree based algorithms for topology control are basically transmission range based type construction algorithms. The construction of an effective backbone, however, is indirectly related to the placement of nodes. Also, the dependence of network reliability on the communication path undertak...

This paper aims to add the information access capabilities to enable user’s mobile terminals in a wireless small satellite telemetry system. The cellular phone-centric mobile network architecture provides wireless communication link; telemetry information is provided to users in a highly personalized form according to the end-user’s range. We choose a reference system-level model of network arc...

The LoRa standard is currently widely employed for low-power long-range wireless sensor networks at sub-GHz frequency bands. longer wavelengths associated with technology provide excellent radiowave propagation characteristics, yielding a much larger coverage than the higher In case of wearable sensors, 868 MHz band can be covered by textile substrate-integrated-waveguide antennas convenient si...

A body area network (BAN) is a network of bodyworn or implanted electronic devices, including wireless sensors which can monitor body parameters or to detect movements. One of the big challenges in BANs is the propagation channel modeling. Channel models can be used to understand wave propagation in and around the human body and they are essential for antenna design, protocol design and the des...

In recent years there has been a paradigm shift from voice centric to data centric wireless communication with data transmission greatly exceeding voice transmission in most developed markets. This phenomenon has caused anxiety in the operators worldwide to enhance the capacity of their wireless networks. Coupled with the demand for high data rate wireless transmission, the increased capacity r...

The possible leveraging of high deployment costs, and the possibility to increase revenue have also introduced the concept of network sharing between different operators. On the other hand, the realization of a user-centric paradigm in future heterogeneous wireless networks, which implies free and automatic choice among different available wireless and mobile access networks, will revolutionize...

In recent times wireless sensor networks (WSNs) have grown enormously and become progressively attractive in wide variety of applications. Wireless sensor networks contain tiny sensor nodes. These sensor nodes have the capability of sensing, communication and computation. Many new protocols are designed for wireless sensor networks where energy, congestion, lifetime, coverage etc are essential ...

Mobile databases are a centerpiece of the dramatic growth of data-centric applications for mobile computing, nomadic communication and wireless networks. Replication of database content is useful in client-server and peerto-peer configurations of mobile distributed databases. We present an adaptation of generalized snapshot isolation for transactions on content data in mobile networks. This sol...