To tackle the dilemma of supporting broadband, high-speed wireless access or well utilizing narrow, non-contiguous spectral resource, Long Term Evolution-Advanced (LTE-A) employs carrier aggregation. It combines different component carriers to send data to users in high rates. Many LTE-A downlink resource scheduling methods seek to assign component carriers or resource blocks to improve through...

Many researchers give attention to Bluetooth Low Energy (BLE) because it has solutions for short range communications. However, there still are many challenging issues which must be resolved before applying to the environment. Therefore, this paper propose an enhanced discovery mechanism for BLE device in order to avoid collisions during advertisement period. We adopt carrier sensing to BLE dev...

In this work, a three-node, two-way relaying network (TWRN) over a multi-carrier system is considered. The aim is to minimize total energy usage of such a multi-carrier TWRN with the constraint of rate requirements on both sides, with both the transmit energy usage as well as the receive energy usage into account. For comparison, two strategies including digital network coding (DNC) and physica...

The authors report the investigation of the charge transport behaviors in mixed thin films of N ,N -diphenyl-N ,N -bis 1-napthyl -1 ,1 -biphenyl-4 ,4 -diamine and tris 8-hydroxyquinoline aluminum. The extracted electron and hole drift mobility were found to be sensitive to the compositional fraction and interpreted by energy levels, charge mobilities of neat compounds, and microscopic networks ...

The Internet of Things (IoT) is an emerging phenomenon in the field of communication, in which smart objects communicate with each other and respond to user requests. The IoT provides an integrated framework providing interoperability across various platforms. One of the most essential and necessary components of IoT is wireless sensor networks. Sensor networks play a vital role in the lowest l...

clustering is an effective approach for managing nodes in wireless sensor network (wsn). a new method of clustering mechanism with using binary gravitational search algorithm (bgsa) in wsn, is proposed in this paper to improve the energy consumption of the sensor nodes.reducing the energy consumption of sensors in wsnsis the objective of this paper that is through selecting thesub optimum senso...

Today, information networks play an important role in supply chain management. Therefore, in this article, clustering-based routing protocols, which are one of the most important ways to reduce energy consumption in wireless sensor networks, are used to optimize the supply chain informational cloud network. Accordingly, first, a clustering protocol is presented using self-organizing map neu...

  The flux-pinning mechanism and activation energy of 10 wt % malic acid-doped MgB2 were investigated by measuring of the critical current density and resistivity as a function of magnetic field and temperature. A crossover field, Bsb, was observed from the single vortex to the small vortex bundle pinning regime. For the sintered sample, the temperature dependence of Bsb(T) at low temperature i...