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Cognitive radio is a promising technology to solve the shortage of spectrum resource. As sensing nodes of the network, secondary users are usually battery powered. Making full use of the energy should also be considered while designing the network. In this paper, we consider the overall throughput of the system and energy consumption. We propose a model of throughput and energy consumption to discuss...
Time synchronization has received a great attention as its crucial parts in wireless sensor networks. To minimize the number of transmission packets and achieve energy efficiency, a time synchronization scheme based on ant colony algorithm (TSAC) is presented in this paper. By exploiting the principle of ant colony algorithm adjusting the pheromone dynamically and automatically, an optimum pair selection...
It is a practical challenge for wireless communication system designs to achieve both high spectral efficiency and energy efficiency because of the nonlinear effect and inefficiency of power amplifier. In previous work, the power amplifier efficiency is always considered as a constant, but it changes with the output power in reality. In this paper, we talk about the impact of variable power amplifier...
With the anticipated exponentially increasing traffic demand in future mobile networks, energy consumption becomes a significant challenge of the information and communication technology industry. Heterogeneous network (HetNet) is a promising infrastructure for both expenditure and energy saving for cellular operators and has attracted intensive research interest. In HetNets, offloading traffic from...
In this paper, adaptive power allocation (PA) on the source and relay is investigated to maximize energy efficiency (EE) for OFDMA opportunistic DF links (O2RL). We derive EE function from O2RL model by appropriate definition of variables to represent source/relay PA, subcarrier transmission mode selection (STMS) elegantly. Theoretical analysis demonstrates that EE function for O2RL is strictly quasi-concave...
With the development of LTE-A technology, spectrum aggregation, relay and other technologies have been applied to the next generation of wireless communication network. However, current research is mostly focus on only one kind of technology, when these technologies coming together, a lot of prerequisites often have been destroyed, and it becomes difficult to achieve. In this paper, we take spectrum...
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