نتایج جستجو برای: cross layer
تعداد نتایج: 759868 فیلتر نتایج به سال:
In this paper, a simple and novel cross-layer adaptive modulation and coding (AMC) scheme, which increases the energy efficiency of the wireless communication system is proposed. Traditionally, AMC has been used to improve MAC-layer performance in terms of coded bit error rate, packet error rate, and throughput. The modulation and coding scheme is switched according to signal-to-noise ratio thr...
A cross-layer optimization scheme is proposed for scalable video transmission over wireless Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) systems. The scalable video coding (SVC) extension of H.264/AVC is used for video source coding. The proposed cross-layer optimization scheme jointly optimizes application layer parameters and physical layer parameters....
In the past few years several cross-layer monitoring and adaptation technologies have been proposed. Although these are cross-layer adaptation technologies, however, in practice they focus on a particular layer. Some solutions involves two layers, yet none of the existing solutions do not consider all the layers during adaptation process. Furthermore, cross-layer adaptation approaches generate ...
Providing cross-layer quality of service (QoS) for wireless multimedia delivery is challenging task which has attracted intensive research over the years. A fundamental problem in this area is how to map QoS criterion at different layers and optimum QoS across the layers. We present end-to-end QoS architecture for multimedia delivery as well as QoS metrics over wireless links together with chan...
The layering principle has been long identified as a way to increase the interoperability and to improve the design of telecommunication protocols, where each layer offers services to adjacent upper layers and requires functionalities from adjacent lower ones. In the past, layering has enabled fast development of interoperable systems, but at the same time limited the performance of the overall...
asymmetric polyethersulfone (pes) microfiltration flat sheet membranes were composed by the phase inversion method (pim) and were used as supports. composite membranes were fabricated by coating silicone rubber as selective layer. effect of different concentrations of pes and pdms and different solvent such as nmp, dmf and dms effects as pes solvents and support thickness and different coagulat...
We consider the cross-layer design considering physical layer, MAC layer, and network layer to maximize the lifetime of energy-constrained wireless sensor network. Our solution is based on system model that considers reliability as well as physical layer (i.e., power control), data link layer (i.e., link scheduling) and network layer (i.e., routing protocol) jointly. To obtain more energy-effic...
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