OFDMA蜂窝网络中基于簇的动态邻区干扰协调算法研究

发布时间：2018-04-08 21:24

本文选题：邻区干扰协调　切入点：软频率复用　出处：《华中科技大学》2014年硕士论文

【摘要】：随着移动用户对于数据率需求的持续增大，3GPP LTE提出了提高频谱效率、减少用户时延和提高小区边缘吞吐量等目标，以提高小区的系统吞吐和满足用户服务质量需求。在OFDM系统中，小区内干扰可以被忽略而邻区干扰成为了主要的干扰源，邻区干扰可以通过邻区干扰协调来抑制。在邻区干扰协调的几种经典算法中，软频率复用和部分频率复用算法应用较为广泛，它们满足小区用户边缘频带的复用因子为3，以保证邻区的边缘频带相互正交，而相邻小区中心用户由于距离邻区较远，占用资源相互重叠而不产生干扰，因此中心用户的频率复用因子为1。基于软频率复用和部分频率复用算法，许多动态的频率分配算法被研究和提出，以进一步提高系统的吞吐量和频谱效率，使得系统的整体复用因子接近1。本论文中，我们提出，基于扇区因子的动态软频率复用算法，和基于簇的部分频率复用的资源交换算法。提出的两种算法在一些方面都创新点，比如场景设计、资源分配算法和迭代交换过程。所提出的动态频率分配算法更能够适应实际的蜂窝小区的场景变化，，并且提高系统的整体吞吐量和小区边缘用户吞吐量。所提出的两种算法与对比的静态软频率复用和部分频率复用算法在LTE系统级的仿真器上完成仿真实验，实验结果显示提出的方法在系统吞吐和公平性方面优于静态的软频率复用和部分频率复用算法。
[Abstract]:With the increasing demand of mobile users for data rate, 3GPP LTE has proposed to improve spectrum efficiency, reduce user delay and improve cell edge throughput, so as to improve system throughput and quality of service (QoS) requirements of the cell.In OFDM system, intra-cell interference can be ignored and neighborhood interference becomes the main interference source, and neighborhood interference can be suppressed by neighborhood interference coordination.Among several classical algorithms for neighborhood interference coordination, soft frequency multiplexing and partial frequency multiplexing algorithms are widely used, which satisfy the needs of cell users with a multiplexing factor of 3 to ensure that the adjacent edge bands are orthogonal to each other.Because the central users are far away from the adjacent areas and occupy resources that overlap each other without interference, the frequency reuse factor of the central users is 1.Based on soft frequency multiplexing and partial frequency multiplexing, many dynamic frequency allocation algorithms have been studied and proposed to further improve the throughput and spectral efficiency of the system, so that the overall multiplexing factor of the system is close to 1.In this paper, we propose a dynamic soft frequency multiplexing algorithm based on sector factor and a resource exchange algorithm based on cluster partial frequency reuse.The two algorithms are innovative in some aspects, such as scenario design, resource allocation algorithm and iterative exchange process.The proposed dynamic frequency allocation algorithm can better adapt to the scene changes of the actual cellular cell and improve the overall throughput of the system and the cell edge user throughput.Compared with the static soft frequency multiplexing algorithm and the partial frequency multiplexing algorithm, the two algorithms are simulated on the LTE system-level simulator.Experimental results show that the proposed method is superior to the static soft frequency multiplexing and partial frequency multiplexing algorithms in terms of system throughput and fairness.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

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