LTE系统干扰抑制的研究

发布时间：2018-04-18 15:00

本文选题：正交频分多址 + 软频率复用　；参考：《南京邮电大学》2015年硕士论文

【摘要】：在LTE系统中使用的是OFDM技术,解决了小区内的用户的干扰问题,因此研究的重心就放在了小区间干扰的研究。本文研究了软频率复用在LTE干扰抑制的作用,首先对比软频率复用与普通频率复用方案,把研究重点放在了复用因子为1和3的方案上,主要分析了小区系统吞吐量以及小区边缘吞吐量。在软频率方案实现中有四个必须提的模块首先分别是:频率资源的分配方案、用户类型的判别(边缘UE的判定)、自适应调制编码、调度算法。我们首先对其进行了介绍。然后对软频率复用技术和普通频率复用技术进行了仿真,并对他们进行了对比分析,仿真结果表明软频率复用技术可以在保证系统吞吐量的情况下,改善通信系统的性能。然后研究了当频率复用因子为7时,采用一种资源调度策略,可以在系统的整体性能上优于频率复用因子为3的软频率复用方案。。本文讨论了中继技术的引进对LTE干扰抑制的作用,首先对中继技术进行了介绍,并分析了中继技术的特点,以及其在抑制小区间干扰的作用,介绍了一个简单的中继协作同通信模型,并根据该模型,把中继引入LTE系统中,并通过参数的设定仿真了一个环境,据此研究中继的加入对LTE的影响,对该模型进了仿真。仿真结果表明,中继节点的加入在不改变系统误码率的情况下,有效地提高边缘小区用户的吞吐量。本文提出了一种基于JP-CoMP的小区间干扰抑制算法,仿真结果表明,基于JP-CoMP的小区间干扰抑制算法提高了系统的性能,增加了小区边缘地带的吞吐量.。
[Abstract]:The OFDM technology is used in LTE system, which solves the interference problem of the users in the cell, so the focus of the research is on the inter-cell interference.In this paper, the role of soft frequency multiplexing in LTE interference suppression is studied. Firstly, the soft frequency multiplexing scheme and the common frequency multiplexing scheme are compared. The emphasis of the research is on the scheme with multiplexing factors of 1 and 3.Cell system throughput and cell edge throughput are analyzed.There are four modules that must be mentioned in the implementation of soft frequency scheme: frequency resource allocation scheme, user type identification (edge UE decision, adaptive modulation coding, scheduling algorithm).We first introduced it.Then the soft frequency multiplexing technology and the common frequency multiplexing technology are simulated and compared. The simulation results show that the soft frequency multiplexing technology can improve the performance of the communication system under the condition of ensuring the system throughput.Then, when the frequency multiplexing factor is 7, a resource scheduling strategy is proposed, which can outperform the soft frequency multiplexing scheme with a frequency reuse factor of 3.In this paper, the effect of relay technology on LTE interference suppression is discussed. Firstly, the relay technology is introduced, and the characteristics of relay technology are analyzed, and the role of relay technology in suppressing inter-cell interference is analyzed.In this paper, a simple relay cooperation and communication model is introduced. According to this model, relay is introduced into LTE system, and an environment is simulated by setting parameters. According to this model, the influence of relay addition on LTE is studied, and the model is simulated.Simulation results show that the addition of relay nodes can effectively improve the throughput of edge cell users without changing the bit error rate (BER) of the system.In this paper, we propose an inter-cell interference suppression algorithm based on JP-CoMP. The simulation results show that the inter-cell interference suppression algorithm based on JP-CoMP improves the performance of the system and increases the throughput of the cell edge.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN929.5

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