LTE随机接入过程关键技术的研究

发布时间：2018-02-25 17:22

本文关键词： LTE 随机接入关键技术前导检测门限算法　出处：《哈尔滨理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：随机接入过程作为通信过程中用户请求接入网络的第一步，是LTE通信网络的重要组成部分。目前广泛应用于LTE系统的随机接入前导检测算法是一种时域检测算法，，传统的时域检测算法主要有动态门限检测算法和固定门限检测算法。在随机接入前导检测中传统动态门限检测算法要根据信噪比动态调整阈值，这样会使得计算复杂度比较大，给网络造成巨大的时延和负担。而采用传统固定门限检测算法虽然计算效率高，但其检测性能还有待提高。在此背景下，本论文主要针对LTE的FDD模式下随机接入过程的关键技术即前导检测技术进行了深入研究，分析了如何对前导序列进行接收和检测，为了满足计算效率的同时达到提高检测性能的目的，对传统的固定门限检测的方法进行了改进。给出了随机接入接收端在FPGA上的实现方案和具体的模块设计。设计并建立了基于Matlab的随机接入前导检测的仿真平台，通过图形化的界面可以设置各种仿真参数。在此基础上按照LTE-FDD标准的测试要求，在高速和低速两种不同的速度场景下，分别采用不同的信道条件和配置参数对改进后的算法性能进行了仿真，结果表明采用改进后算法的前导序列检测性能完全达到了LTE规定的标准。最后对比了高速模式下采用传统的固定门限检测算法和改进后的门限检测算法的性能仿真结果，表明了改进后的算法能够有效的提高随机接入信号的检测性能。
[Abstract]:Random access process, as the first step of user request access network, is an important part of LTE communication network. At present, random access preamble detection algorithm, which is widely used in LTE system, is a time-domain detection algorithm. The traditional time domain detection algorithms mainly include dynamic threshold detection algorithm and fixed threshold detection algorithm. The traditional fixed threshold detection algorithm has high computational efficiency, but its detection performance still needs to be improved. Under this background, this paper mainly focuses on the key technology of random access process in FDD mode of LTE, which is the leading detection technology, and analyzes how to receive and detect the leading sequence. In order to satisfy the calculation efficiency and improve the detection performance, The traditional method of fixed threshold detection is improved. The implementation scheme of random access receiver on FPGA and the specific module design are given. The simulation platform of random access preamble detection based on Matlab is designed and established. All kinds of simulation parameters can be set by graphical interface. On this basis, according to the test requirements of LTE-FDD standard, under two different speed scenarios of high speed and low speed, The performance of the improved algorithm is simulated with different channel conditions and configuration parameters. The results show that the performance of the improved algorithm is up to the standard specified by LTE. Finally, the performance simulation results of the traditional fixed threshold detection algorithm and the improved threshold detection algorithm in high speed mode are compared. It shows that the improved algorithm can effectively improve the detection performance of random access signals.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

【引证文献】