不完全信道估计下两跳合作系统的节能功率分配

Osama Amin, E. Bedeer, M. Ahmed, O. Dobre, Mohamed-Slim Alouini
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引用次数: 2

摘要

最近,人们非常关注使用能效(EE)指标的无线通信系统的绿色设计,这些指标应该捕获所有能源消耗源以传递所需的数据。在本文中,我们为使用放大和转发中继方案的合作两跳系统制定了一个精确的EE度量。与现有研究假设通信合作节点上存在完美信道状态信息(CSI)不同,本文假设了一个实际场景,即使用训练飞行员对信道进行估计。估计的CSI可以用来调整拟议系统的可用资源,以最大化EE。假设了两种估计策略,即分解信道估计和级联信道估计。分解信道估计假设中继上有信道估计器,级联信道估计是中继不配备信道估计器,只转发接收到的导频,以便让目的地估计合作链路。信道估计成本通过包括信噪项中的估计误差和考虑估计阶段的能量消耗来反映在EE度量上。在此基础上,提出了一种能量感知的功率分配算法,通过信道估计使合作系统的功率最大化。此外,我们还通过仿真实例研究了估计参数对优化后的EE性能的影响。
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Energy-efficient power allocation of two-hop cooperative systems with imperfect channel estimation
Recently, much attention has been paid to the green design of wireless communication systems using energy efficiency (EE) metrics that should capture all energy consumption sources to deliver the required data. In this paper, we formulate an accurate EE metric for cooperative two-hop systems that use the amplify-and-forward relaying scheme. Different from the existing research that assumes the availability of perfect channel state information (CSI) at the communication cooperative nodes, we assume a practical scenario, where training pilots are used to estimate the channels. The estimated CSI can be used to adapt the available resources of the proposed system in order to maximize the EE. Two estimation strategies are assumed namely disintegrated channel estimation, which assumes the availability of channel estimator at the relay, and cascaded channel estimation, where the relay is not equipped with channel estimator and only forwards the received pilot(s) in order to let the destination estimate the cooperative link. The channel estimation cost is reflected on the EE metric by including the estimation error in the signal-to-noise term and considering the energy consumption during the estimation phase. Based on the formulated EE metric, we propose an energy-aware power allocation algorithm to maximize the EE of the cooperative system with channel estimation. Furthermore, we study the impact of the estimation parameters on the optimized EE performance via simulation examples.
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