基于协作的绿色通信关键技术研究

发布时间：2018-02-25 08:27

本文关键词： 绿色通信协作通信能量有效性时间有效性多目标优化协作频谱共享　出处：《南京邮电大学》2014年硕士论文　论文类型：学位论文

【摘要】：在传统网络向全新网络架构演进的过程中,无线网络的能耗问题日益受到关注,“绿色化”已成为未来无线通信的一个重要发展方向。在绿色无线通信的推进与实现过程中,协作通信是一个活跃的研究领域。本文基于协作通信的思想进行绿色通信问题的研究,主要工作包括两部分：源节点和协作节点发送功率的联合优化分配方案,以及“补偿式”协作频谱共享技术。论文首先介绍了协作通信技术的协议,阐述了协作通信技术在OFDM、物理层网络编码、分布式空时码中的应用,描述了绿色通信新的衡量标准——能量有效性和时间有效性。其次,提出了一种源节点、多个协作节点发送功率的联合分配方案。方案中,以系统的能量有效性和时间有效性的联合函数作为优化目标,利用经典的基于KKT(Karush-Kuhn-Tucker)条件的Lagrange算法求解,得到了源节点功率和协作节点功率的闭合表达式。该方案可在提升系统能量有效性的同时,降低计算复杂度。最后,文章对“补偿”式协作频谱共享技术进行研究,提出了一种基于时间划分的优化算法。该算法通过灵活分配协作时间比例和协作功率,来提高系统的能量有效性。具体体现在：对主用户而言,协作增益节约的时间就是奖励给次用户的时间,无需更多的信令开销和计算；对次用户而言,有了更多的传输机会。因而,系统的能量有效性得到了更大的提升。
[Abstract]:In the process of evolution from traditional network to new network architecture, the problem of wireless network energy consumption has been paid more and more attention. "Green" has become an important development direction of wireless communication in the future. Cooperative communication is an active research field. Based on the idea of cooperative communication, this paper studies green communication problem. The main work includes two parts: the joint optimal allocation of power between source node and cooperative node. Firstly, the protocol of cooperative communication technology is introduced, and the application of cooperative communication technology in OFDM, physical layer network coding and distributed space-time code is described. In this paper, a new measure of green communication, energy efficiency and time efficiency, is described. Secondly, a joint power allocation scheme for source nodes and multiple cooperative nodes is proposed. Taking the joint function of energy efficiency and time efficiency of the system as the optimization objective, the classical Lagrange algorithm based on KKT KT Karush-Kuhn-Tucker condition is used to solve the problem. The closed expressions of source node power and cooperative node power are obtained. This scheme not only improves the energy efficiency of the system, but also reduces the computational complexity. Finally, the "compensated" cooperative spectrum sharing technique is studied in this paper. In this paper, an optimization algorithm based on time division is proposed, which can improve the energy efficiency of the system by allocating the cooperation time ratio and power flexibly. The time saved by the cooperative gain is to reward the time to the secondary user without more signaling overhead and computation. For the secondary user, there are more transmission opportunities. Therefore, the energy efficiency of the system is improved more.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

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