论文标题
具有机会频谱的节能缓冲辅助继电器系统
Energy-Efficient Buffer-Aided Relaying Systems with Opportunistic Spectrum Access
论文作者
论文摘要
在本文中，提出了用于合作中继网络的节能跨层设计框架，该框架考虑了频谱利用率的影响。具体而言，考虑了随机到达流量，并且在合作传输系统中采用自适应调制和编码（AMC）方案以改善系统性能。首先研究了继电器缓冲器的平均数据包下降率。随着数据包下降速率和系统状态的固定分布，得出了延迟的闭合形式表达。然后研究了继电器辅助传输的能源效率，该传输考虑了继电器和来源的排队过程。在这种情况下，提出了能源效率优化问题，以确定继电器辅助合作系统的最佳功率和时间分配策略。最后，获得了继电器辅助传输与直接传输之间的节能切换策略，其中数据包传输具有不同的延迟要求。此外，还获得了使用AMC的节能传输政策。数值结果证明了提出的设计提高了能源效率的有效性。
In this paper, an energy-efficient cross-layer design framework is proposed for cooperative relaying networks, which takes into account the influence of spectrum utilization probability. Specifically, random arrival traffic is considered and an adaptive modulation and coding (AMC) scheme is adopted in the cooperative transmission system to improve the system performance. The average packet dropping rate of the relay-buffer is studied at first. With the packet dropping rate and stationary distribution of the system state, the closed-form expression of the delay is derived. Then the energy efficiency for relay-assisted transmission is investigated, which takes into account the queueing process of the relay and the source. In this context, an energy efficiency optimization problem is formulated to determine the optimum strategy of power and time allocation for the relay-assisted cooperative system. Finally, the energy efficient switching strategy between the relay assisted transmission and the direct transmission is obtained, where packet transmissions have different delay requirements. In addition, energy efficient transmission policy with AMC is obtained. Numerical results demonstrate the effectiveness of the proposed design improving the energy efficiency.
