TD-LTE系统在通用处理器平台上的下行链路实现与优化

发布时间：2018-03-11 07:52

本文选题：LTE下行接收链路　切入点：系统实现　出处：《北京邮电大学》2014年硕士论文　论文类型：学位论文

【摘要】：TD-LTE是我国拥有自主知识产权的第四代移动通信技术,以正交频分复用(OFDM)技术和多输入多输出(MIMO)技术为核心,具有高峰值数据速率、低传输时延和高移动性的特性。通用处理器平台(General Purpose Platform, GPP)具有高效的指令级并行处理能力,因其能极大得提高LTE系统的实时信号处理能力而成为当下研究的热点。本论文主要工作和创新是对TD-LTE系统的下行接收链路在通用处理器(GPP)平台进行了实现和优化。通过对下行无线链路的设计,实现了TD-LTE下行接收链路的主要模块功能,包括自动增益放大、小区搜索时频同步、解前端、信道估计、信道均衡、解资源映射以及后续的比特级处理流程。为了优化TD-LTE系统的下行接收链路性能,从微处理器内核架构入手,提出了编译器优化、SISD指令优化和SIMD指令优化的方法。通过实验验证了所设计模块的正确性,给出了下行接收链路各模块耗时分布性能等。结合链路实现部分采用的优化方法,总结了在GPP平台上对TD-LTE下行接收链路进行优化的整体方案,对其他类型的GPP平台的性能实现与优化具有很好的借鉴意义。
[Abstract]:TD-LTE is a 4th generation mobile communication technology with independent intellectual property rights in China. It has high peak data rate with the core of orthogonal Frequency Division Multiplexing (OFDM) and multiple input and multiple output (MIMO) technologies. General Purpose platform (GPPs) has high command level parallel processing capability, which can greatly improve the real-time signal processing capability of LTE system. The main work and innovation of this paper is to realize and optimize the downlink of TD-LTE system on the platform of GPP.Through the design of downlink wireless link, the main module function of TD-LTE downlink is realized. It includes automatic gain amplification, cell search time-frequency synchronization, de-front-end, channel estimation, channel equalization, de-resource mapping and subsequent bit-level processing. In order to optimize the downlink reception performance of TD-LTE system, Based on the microprocessor kernel architecture, the methods of compiler optimization for SISD instruction optimization and SIMD instruction optimization are proposed. The correctness of the designed module is verified by experiments. In this paper, the time-consuming distribution performance of each module of downlink receiving link is given. Combined with the optimization method adopted in link realization, the overall scheme of optimizing downlink of TD-LTE on GPP platform is summarized. For other types of GPP platform performance implementation and optimization has a good reference significance.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

【共引文献】