协作通信网络的中继选择和功率分配技术研究

发布时间：2018-02-14 12:31

本文关键词： 协作网络中继选择功率分配联合优化　出处：《西安电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着无线通信的飞速发展,人们对无线通信系统的业务性能要求也越来越高。协作通信技术可以有效地降低无线信道衰落特性给通信性能带来的影响,提高了网络的性能和可靠性。其基本思想在存在多个单天线终端的通信环境中,多个终端按照约定的方式相互共享彼此的天线从而形成一个虚拟的多天线系统,来增强给定终端的分集效应,提高系统的传输性能。本文首先研究了协作通信网络的中继选择问题,介绍了几种常见的中继选择算法,分析了不同算法的优缺点,提出了基于信噪比门限的改进中继选择算法,并通过仿真验证该算法的中断性能和系统速率有所提升。其次,本文分析了协作通信网络中的功率分配问题,详细阐述了两种常见的功率分配算法,并分析了两种功率分配方案的误符号率性能以及中断性能。仿真验证了两种方案给协作通信网络带来的性能提升。最后,本文结合中继选择和功率分配两种技术的优点,研究了协作通信网络的中继选择和功率分配联合优化问题。在不同网络场景下提出了两种基于中继选择和功率分配的联合优化方案,分别解决了不同网络环境条件下系统的能效问题,提高了系统的能效表现和网络性能。针对网络所处环境条件不同,联合优化方案划分为两种情况。一,在满足给定的网络性能限定条件下,最小化协作通信网络功率的联合优化方案；二,在综合考虑网络传输速率和能耗的情况下,最优化协作通信网络的能源效率的联合优化方案。对联合优化问题进行分析,并求解得到了不同方案最优解的闭合表达式。仿真验证优化方案都提升了协作通信网络的性能。
[Abstract]:With the rapid development of wireless communication, the service performance of wireless communication systems is becoming more and more demanding. Cooperative communication technology can effectively reduce the impact of wireless channel fading characteristics on communication performance. The basic idea of the network is that in a communication environment with multiple single antennas, multiple terminals share each other's antennas in an agreed manner, thus forming a virtual multi-antenna system. In order to enhance the diversity effect of a given terminal and improve the transmission performance of the system, this paper first studies the relay selection problem in cooperative communication networks, introduces several common relay selection algorithms, and analyzes the advantages and disadvantages of different algorithms. An improved relay selection algorithm based on signal-to-noise ratio (SNR) threshold is proposed, and the interrupt performance and system rate of the algorithm are verified by simulation. Secondly, the power allocation problem in cooperative communication networks is analyzed in this paper. Two common power allocation algorithms are described in detail, and the performance of symbol error rate and interrupt of the two power allocation schemes are analyzed. The simulation results show that the two schemes can improve the performance of cooperative communication network. This paper combines the advantages of relay selection and power allocation. The joint optimization of relay selection and power allocation in cooperative communication networks is studied. Two joint optimization schemes based on relay selection and power allocation are proposed in different network scenarios. The energy efficiency problem of the system under different network environment conditions is solved, and the system energy efficiency performance and network performance are improved. According to the different environmental conditions of the network, the joint optimization scheme is divided into two situations. A joint optimization scheme that minimizes the power of cooperative communication networks under given network performance constraints; second, considering the network transmission rate and energy consumption, The joint optimization scheme of energy efficiency of cooperative communication network is optimized. The joint optimization problem is analyzed and the closed expression of the optimal solution of different schemes is obtained. The simulation results show that the optimization scheme improves the performance of cooperative communication network.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN915.0

【相似文献】