LTE-A系统下D2D通信干扰抑制算法的研究

发布时间：2018-05-06 06:15

本文选题：LTE-A系统 + D2D通信　；参考：《兰州理工大学》2017年硕士论文

【摘要】：随着智能移动终端的广泛应用以及新型无线数据业务的不断涌现,以基站为核心的传统LTE-A系统面临着严峻的挑战。D2D通信是一种使移动终端之间不通过基站转发而直接进行数据传输的新型通信技术,在LTE-A系统中引入D2D通信技术不仅能够提高系统容量、数据传输速率以及能量效率,还可以提高频谱资源利用率,很大程度上缓解频谱资源匮乏的难题。本文主要研究了LTE-A系统下D2D通信资源分配以及干扰抑制问题,分别针对D2D通信复用蜂窝上行资源与下行资源两种场景下干扰问题,提出相应的资源分配算法,旨在通过合理的资源分配来抑制通信干扰。此外,在资源分配时还结合了两种功率控制方法调节用户发送功率,以降低能耗。具体内容如下:1.针对D2D通信复用蜂窝上行资源时产生的同频干扰问题,提出了一种基于模糊聚类分组的资源分配算法以抑制干扰。该算法允许多个D2D用户复用同一蜂窝用户上行资源,首先将系统内所有D2D用户进行模糊聚类分组,其次基于最小化中断概率为每个D2D分组选择一个最优蜂窝用户上行资源。最后,考虑到D2D应用于社交网络中对系统能量效率要求较高的情况,联合一种有效的功率控制方案调节用户的发送功率,以提高能效。仿真表明,该算法降低了用户间干扰以及系统能耗,提高了系统吞吐量以及系统满意度。2.针对D2D通信复用蜂窝下行资源时产生的同频干扰问题,提出一种基于图着色的加权优先资源分配算法以抑制干扰。该算法首先建立异构干扰图,对系统内终端用户及干扰类型进行分类异构。其次考虑多种因子计算用户的着色优先级,并且同时进行着色资源分配。最后依据资源分配结果,基于最小化能耗调节用户发送功率。仿真表明,该算法既可以降低用户间干扰、提高系统吞吐量,又能够降低系统能耗、延长移动终端通信时间。
[Abstract]:With the wide application of intelligent mobile terminals and the emergence of new wireless data services, The traditional LTE-A system with base station as its core is facing a severe challenge. D2D communication is a new communication technology that enables mobile terminals to transmit data directly without transmitting by base station. The introduction of D2D communication technology in LTE-A system can not only improve the system capacity, data transmission rate and energy efficiency, but also improve the efficiency of spectrum resources, to a large extent, alleviate the problem of lack of spectrum resources. In this paper, the problem of D2D communication resource allocation and interference suppression in LTE-A system is studied, and the corresponding resource allocation algorithm is proposed for the interference problem of D2D communication multiplexing cellular uplink resource and downlink resource respectively. The aim is to restrain communication interference by rational resource allocation. In addition, two power control methods are combined in resource allocation to reduce energy consumption. The details are as follows: 1. A resource allocation algorithm based on fuzzy clustering is proposed to suppress the interference caused by co-frequency interference caused by D2D communication multiplexing cellular uplink resources. The algorithm allows multiple D2D users to reuse the same cellular user's uplink resources. Firstly, all D2D users in the system are grouped by fuzzy clustering, and then an optimal cellular user's uplink resource is selected for each D2D packet based on minimizing the outage probability. Finally, considering the high requirement of system energy efficiency in the application of D2D in social networks, an effective power control scheme is proposed to adjust the transmission power of users to improve energy efficiency. Simulation results show that the proposed algorithm reduces interuser interference and system energy consumption and improves system throughput and system satisfaction. A weighted priority resource allocation algorithm based on graph coloring is proposed to suppress the interference caused by co-frequency interference caused by D2D communication multiplexing cellular downlink resources. The algorithm firstly builds the heterogeneous interference graph and classifies the end users and interference types in the system. Secondly, various factors are considered to calculate the user's coloring priority, and coloring resources are allocated at the same time. Finally, according to the result of resource allocation, the user transmission power is adjusted based on minimizing energy consumption. Simulation results show that the proposed algorithm can not only reduce interuser interference, improve system throughput, but also reduce system energy consumption and prolong communication time of mobile terminal.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.5

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