基于LTE的Femtocell网络中频率复用算法的优化研究

发布时间：2018-06-23 02:29

本文选题：LTE + 频率复用　；参考：《东北大学》2014年硕士论文

【摘要】：随着用户对高速数据业务需求的快速增长,运营商宏蜂窝网络室内覆盖较差的问题日益突显,Femtocell (飞蜂窝)技术应运而生,它能够有效解决室内覆盖问题。然而Femtocell网络的引入也会对现有的宏蜂窝网络带来一些挑战,干扰问题便是其中之一。FFR技术可分为静态、动态和准动态这三种模式。相对而言,动态FFR性能好但具有较高的额外开销和复杂度,而静态FFR的性能优化空间大。准动态FFR在增益与额外开销的平衡上具有明显优势,成为优化静态FFR技术的重要途径。本文针对LTE系统,提出了一种基于用户分布的新型高效准动态部分频率复用方案,其核心思路是：(1)从系统性能优化的角度,每个用户都有最适合的复用模式；(2)由于中心用户的SINR较高,复用为1的组网方式已经接近最优解,所以如何优化边缘用户的性能极为重要；(3)根据强干扰源的不同,细分边缘用户,可在不改变复用因子的情况下提高SINR；(4)根据不同用户分布场景,对频带进行分配,提高频带利用率。软频率复用(SFR)被认为是当下最具代表性的ICIC方案,但它是一种固定分配频谱、适用于用户均匀分布情况下的静态ICIC技术,还有很大的优化空间。论文又提出了一种基于用户服务质量的中心频带补偿算法。在提出完整的算法理论后,本文将此算法,对边缘的资源块进行分类处理：(1)资源性能较好,继续给边缘用户使用；(2)资源性能较差,补偿给中心用户使用；(3)为了保护用户的服务质量,对被保护用户进行,反馈干扰避免。在LTE系统级仿真平台中进行实现,以Matlab为工具,设计了不同的参数与仿真场景,并选择同类算法与本文算法进行性能对比。通过大量的理论与仿真分析表明,本文提出的基于用户分布的准动态部分频率复用算法与基于用户服务质量的中心频带补偿算法在一定条件下都可以提升系统的性能。
[Abstract]:This paper presents a new efficient quasi - dynamic partial frequency reuse scheme based on user distribution .
( 2 ) How to optimize the performance of edge users is very important because the central user ' s SINR is high , and the network mode of multiplexing is 1 .
( 3 ) according to different interference sources , the edge users can be subdivided , and the SINR can be improved without changing the multiplexing factors ;
( 4 ) According to different user distribution scenes , the frequency band is allocated and the frequency band utilization rate is improved . The soft frequency multiplexing ( SFRs ) is considered to be the most representative inter - band allocation spectrum in the present invention , but it is a fixed allocation frequency spectrum , which is suitable for the static inter - band compensation technology under the condition of uniform distribution of users , and also provides a large optimization space . After the complete algorithm theory is proposed , the algorithm is applied to classify the resource blocks of the edge .
( 2 ) the resource performance is poor , and the compensation is used for the central user ;
( 3 ) In order to protect the user ' s quality of service , feedback interference avoidance is carried out for the protected user . In the LTE system level simulation platform , different parameters and simulation scenes are designed , and the performance of the same algorithm is compared with the algorithm in this paper . Through a large number of theory and simulation analysis , the quasi - dynamic part frequency multiplexing algorithm based on user distribution and the center band compensation algorithm based on user quality of service can improve the performance of the system under certain conditions .
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

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