LTE蜂窝小区干扰控制算法研究

发布时间：2018-04-05 01:26

本文选题：抗干扰　切入点：LTE　出处：《电子科技大学》2016年硕士论文

【摘要】：为了适应无线通信网络快速发展的迫切需求以及日益紧张的频谱资源,研究更加有效的抗干扰技术的必要性是显而易见的。对于LTE蜂窝小区而言,虽然其小区内部的移动用户受到的干扰在很大程度上得到了控制,但是位于小区边缘处的移动终端所受到的来自相邻小区以及相邻终端的干扰还是比较严重的。因此,本项目联合国外某通信企业研究部,主要解决蜂窝小区边缘用户的干扰情况。本文的主要研究内容分为以下几个方面:首先,本文分析了干扰控制与LTE信道关联度。其次,根据基站功率实测值,通过对基站功率的持续状态特性,转移特性,波动特性的分析,从而对基站功率进行建模,为下文利用功率序列做好基础。再者,本文针对LTE蜂窝小区边缘用户干扰比较严重的情况,根据基站功率建模序列,提出了基于功率序列的抗干扰算法,包括结合频率复用1/2的功率序列算法以及适应负载变化的功率序列算法。当采用适应动态负载的功率序列算法时,LTE会及时改变抗干扰算法的权重因子。然后,通过分析出PDCCH信道干扰码的相关度和信干比有很大的关联的结论,从而提出了利用功率建模序列控制PDCCH干扰码互相关性从而提高信干比的改进算法。最后,本文分析了LTE下行链路,通过MATLAB仿真平台搭建了LTE下行仿真平台,并在平台里验证了基于功率序列的算法可以提高信干比,尤其是在小区高负载的情况下。如果选择扰码比特为144时,相比之下SINR可以提高2dB左右;如果选择扰码比特为2400时,相比之下SINR可以提高0.8dB左右。接着对改进的基于功率序列的算法和传统的频率复用算法进行对比,该算法明显优于传统的抗干扰算法。通过两种算法仿真对比,得出了在小区较低负载的情况下功率序列结合频率复用的算法略微优于功率序列控制PDCCH信道的算法,在高负载的情况下,优越性反之,最后用C++语言实现了算法。本算法已经设计完毕,从仿真结果显示在一定程度上提升了边缘用户的信干比。
[Abstract]:In order to meet the urgent needs of the rapid development of wireless communication networks and increasingly scarce spectrum resources, research on more effective anti interference technology is obviously necessary. For LTE cells, although the interference areas within the mobile users are largely under control, but the interference from adjacent cells and adjacent terminals the mobile terminal is located in the district at the edge of which is comparatively serious. Therefore, the project of a foreign joint enterprise communication research, mainly to solve the interference of honeycomb cell edge users. The main content of this paper is divided into the following aspects: firstly, this paper analyzes the interference control and LTE channel correlation. Secondly, according to the measured value of base station power, transfer characteristics through the continuous state characteristics of base station power, so as to carry out the analysis of fluctuation characteristics of the construction of power station Die, laying the foundation for the discussion below by using the power series. Furthermore, according to the LTE cell edge user interference more serious, according to the base station power modeling sequence, anti-jamming algorithm is proposed based on the sequence of power, including the power series algorithm combined with frequency multiplexing 1/2 and adapt to the change of load power series algorithm. When using adaptive power sequence the dynamic load algorithm, weight factor LTE will change the anti-jamming algorithm in time. Then, through the analysis of correlation and channel PDCCH channel interference code Association stem than to have a lot of conclusions, and put forward by modeling the power sequence control PDCCH interference code correlation to improve the signal-to-noise ratio of the improved algorithm. Finally in this paper, analysis of the LTE downlink simulation platform was built by MATLAB LTE downlink simulation platform, and verified based on power series algorithm to improve the platform Sir, especially in the area of high load condition. If you choose a scrambling code bit is 144, compared to SINR can be increased by about 2dB; if you choose the scrambling code bit is 2400, compared to SINR can be increased by about 0.8dB. Then the modified power series algorithm and the traditional algorithm based on frequency reuse were compared. Anti jamming algorithm is superior to the traditional one. By comparing the two kinds of algorithm simulation, obtained in the area of low load under the condition of power sequence combined with frequency reuse algorithm is slightly better than the PDCCH channel power sequence control algorithm in high load conditions, the superiority of the algorithm and finally realized by the C++ language. The algorithm has been designed, the simulation results show that in a certain extent to enhance the edge user SNR.

【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN929.5

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