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This paper proposes an energy-efficient position of relay node (RN) for a cooperative single amplify-and-forward relay. The optimum position of RN based on a single carrier-frequency division multiple access of LTE-A network is proposed. The proposed scheme models load balance to maximize energy efficiency (EE) for multiple users. Two categories of users (UEs) are considered; guaranteed bit rate (GBR)...
Femtocells have gained a lot of attention recently due to their advantages in terms of infrastructure cost saving and improved use rexperience in indoor environments. Several standards bodies, such as 3GPP, worldwide interpretability for microwave access (WiMAX) Forum, and IEEE802.16, have started to develop standard solutions to enable and optimize Femtocells operation. In this paper, a multi-level...
Energy saving has become an important issue in wireless communications from both environment and economic considerations. In this paper, the optimal multi-relay placement (OMRP) scheme in Long Term Evolution-Advanced (LTE-A) is proposed. It determines the optimal positions of relays with the objective of maximizing the energy efficiency. In addition, the optimal number of required relays around evolved-NodeB...
In this paper, we investigate a cross-layer routing framework for centralized multi-hop cognitive radio networks in TV white spaces. Our Cross-layer routing focuses on joint spectrum allocation and power control. The problem is mathematically modeled as mixed integer nonlinear program that requires an appropriate solution methodology. We examined a solution based on nonlinear terms relaxation in conjunction...
A group of sensor nodes deployed in particular environment constitutes a wireless sensor network (WSN). At times the WSN can be even deployed in a very sensitive area where the security becomes a great problem. The present asymmetric encryption methods and symmetric encryption methods can offer the security levels but with many limitations. For instance key maintenance is a great problem faced in...
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