OFDM双向中继网中基于物理层网络编码的资源分配研究

发布时间：2018-03-24 06:34

本文选题：OFDM双向中继网　切入点：物理层网络编码　出处：《燕山大学》2015年硕士论文

【摘要】：随着通信技术日趋成熟,资源受限的通信系统已经开始影响系统整体的吞吐量,需要提出一种高效的资源分配方案,在保证高频谱利用率及链路传输速率的同时有效降低传输能耗。目前已有的资源分配算法大多致力于提升系统吞吐量,鲜有文献研究系统能效,因此本文针对OFDM(Orthogonal Frequency Division Multiple)双向中继网络,研究高效且节能的资源分配算法,主要内容如下。首先,针对单用户OFDM双向中继网络,提出一种基于物理层网络编码的高效资源分配算法,将物理层网络编码与中继技术研究相结合,可以有效缩短传输周期,提高系统的频谱利用率。该算法的主要优化目标是在保障链路传输速率约束的同时提升系统整体的能效性能,遵循边缘自适应资源分配准则,采用子载波配对技术,联合优化中继、子载波等资源的分配,最终应用KKT条件求解拉格朗日函数得到最佳的传输功率表达式。其次,针对多用户OFDMA双向中继网络,提出一种高效的资源分配算法,扩展应用范畴研究多用户的接入问题。本算法首先采用增益排序配对法进行子载波对的初始分配,随后考虑瞬时链路传输状态,应用迭代优化算法对子载波以及功率资源在每个用户之间进行分配优化,在满足各用户对传输质量的需求的同时,为每个用户分配最佳的链路传输资源以实现系统性能的最大增益,降低系统总能耗。最后,模拟实际通信传输场景,针对单用户OFDM双向中继网络,提出一种可以有效处理信道估计误差的资源分配算法。在实际链路传输环境中,信道估计误差的存在会影响系统的整体性能,因此,本算法中将估计误差视作高斯白噪声参与信号处理,有效降低了信道估计误差对系统能效性能产生的影响,在保证实际链路传输速率需求的同时使得系统功率损耗达到最低。
[Abstract]:With the development of communication technology, resource-constrained communication systems have begun to affect the overall throughput of the system, so it is necessary to propose an efficient resource allocation scheme. At the same time, it can effectively reduce transmission energy consumption while ensuring high spectral efficiency and link transmission rate. At present, most of the existing resource allocation algorithms are devoted to improving the system throughput, and few literatures have studied the system energy efficiency. Therefore, this paper studies the efficient and energy efficient resource allocation algorithm for OFDM(Orthogonal Frequency Division multiple) bidirectional relay network. The main contents are as follows. Firstly, for single user OFDM bidirectional relay network, An efficient resource allocation algorithm based on physical layer network coding is proposed. The combination of physical layer network coding and relay technology can effectively shorten the transmission period. The main optimization goal of the algorithm is to improve the overall energy efficiency performance of the system while ensuring the link transmission rate constraints, following the edge adaptive resource allocation criteria, and adopting subcarrier pair technology. Finally, the KKT condition is used to solve the Lagrangian function to obtain the best transmission power expression. Secondly, an efficient resource allocation algorithm is proposed for multi-user OFDMA bidirectional relay networks. The extended application category is used to study the multiuser access problem. Firstly, the gain sequence pairing method is used for the initial allocation of subcarrier pairs, and then the instantaneous link transmission state is considered. The iterative optimization algorithm is applied to optimize the distribution of subcarriers and power resources among each user, which meets the needs of each user for transmission quality at the same time. Each user is assigned the best link transmission resources to achieve the maximum gain of system performance and reduce the total energy consumption. Finally, the simulation of the actual communication transmission scenario, for single-user OFDM two-way relay network, This paper presents a resource allocation algorithm which can deal with channel estimation errors effectively. In the real link transmission environment, the existence of channel estimation errors will affect the overall performance of the system. In this algorithm, the estimation error is regarded as Gao Si white noise to participate in signal processing, which effectively reduces the influence of channel estimation error on the energy efficiency performance of the system, and makes the power loss of the system reach the minimum while ensuring the demand of the actual link transmission rate.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN929.53

【共引文献】