نتایج جستجو برای: carrier energy networks
تعداد نتایج: 1126702 فیلتر نتایج به سال:
We investigate the unicast problem for ad-hoc networks in the plane using MIMO techniques. In particular, we use the multi-node beamforming gain and present a self-synchronizing algorithm for the necessary carrier phase synchronization. First, we consider n nodes in a grid where the transmission power per node is restricted to reach the neighboring node. We extend the idea of multi-hop routing ...
The ultrafast decay of the x-ray diffraction intensity following laser excitation of an InSb crystal has been utilized to observe carrier dependent changes in the potential energy surface. For the first time, an abrupt carrier dependent onset for potential energy surface softening and the appearance of accelerated atomic disordering for a very high average carrier density have been observed. In...
Light-induced generation of free charge carriers in semiconductors constitutes the physical basis of photodetection and photovoltaics. To maximize its efficiency, the energy of the photons must be entirely used for this purpose. This is highly challenging owing to the ultrafast thermalization of 'hot' carriers, which are created by absorption of high-energy photons. Thermalization leads to heat...
Advances in wireless personal area networking p. 3 A comparative study of routing strategies for wireless sensor networks : are MANET protocols good fit? p. 5 Detecting disruptive routers in wireless sensor networks p. 19 Energy-efficient data dissemination in sensor networks using distributed dynamic tree management p. 32 Virtual coordinates with backtracking for void traversal in geographic r...
This paper proposes computationally efficient algorithms to maximize the energy efficiency in multi-carrier wireless interference networks, by a suitable allocation of the system radio resources, namely the transmit powers and subcarrier assignment. The problem is formulated as the maximization of the system global energy efficiency (GEE) subject to both maximum power and minimum rate constrain...
A great deal of research has been directed toward reducing energy consumption at the 802.11-based MAC layer for mobile ad hoc networks (MANETs). There exists an approach that uses maximum power during the RTSCTS exchange and computes the required amount of power in order for DATA and ACK messages to reach the receiver and sender. It, however, does not consider the existence of an interference r...
Multi-stream carrier aggregation (MSCA) has been recently proposed as a mechanism to increase the amount of bandwidth available to users for heterogeneous networks (HetNets) in 5G cellular systems. Previous studies have focused only on maximizing the network capacity and fairness, without considering the energy efficiency of the MSCA. In this paper, the use of MSCA to minimize the energy consum...
As wireless devices are more widely used, it is clear that security and energy consumption are major concerns. From a energy perspective, it is increasingly evident that marginal gains in battery energy density necessitate energy efficient protocols. In the security realm, growth in the value and amount of information being transmitted over wireless channels demands confidentiality and integrit...
Recent advances in wireless electronic and communications provide us the ability to build small, economical sensors with low power consumption and many diverse applications. Limited energy capacity of sensors is a huge challenge that will affect these networks. Clustering has been used as a well-known method to handle this challenge. To find appropriate location of clusters' heads, imperialist ...
Resource allocation for energy efficiency optimization in multi-carrier interference networks with multiple receive antennas is tackled. First, a one-hop network is considered, and then, the results are extended to the case of a two-hop network in which amplify-and-forward relaying is employed to enable communication. A distributed algorithm which optimizes a system-wide energy-efficient perfor...
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