LTE上行链路波形设汁与软件无线电实现

发布时间：2017-12-30 22:21

  本文关键词：LTE上行链路波形设汁与软件无线电实现　出处：《电子科技大学》2015年硕士论文　论文类型：学位论文

  更多相关文章： 信道编码 单载波频分多址 软件无线电 图形化开发

【摘要】：随着LTE多频多模智能手机时代的来临,要求在2G、3G模式基础上支持LTE模式,并实现国际漫游的工作频段,因此频段总量接近40个。对于设备制造商来说,支持如此多的标准和频段所面临的挑战非常大,需要设计不同的硬件平台来支持不同标准及频段,所以产品的开发周期长、设计成本及维护成本非常高。因此许多设备制造商,开始采用日益成熟的软件无线电技术,希望利用软件无线电的可编程、可重构等优点,实现快速开发验证以减少成本。为此,论文基于团队自主研发的uSDR软件无线平台上,研究了LTE上行链路关键技术,根据需求完成了LTE上行链路波形的设计与图形化开发了LTE上行链路波形,并在软件无线电平台上对链路的性能进行了测试分析。本文主要工作如下:第一,研究了LTE的帧结构、导频信号设计、信道估计与均衡等关键技术。根据项目对链路的功能需求和性能需求,给出了LTE上行链路波形设计方案:发射端主要采用了CRC编码、Turbo编码、加扰、16QAM调制、SC-FDMA调制、加循环前缀及上变频等设计方案。为了便于设计与实现,将LTE上行链路波形处理流程划分为发射单元、接收单元、中射频处理单元、同步单元四个部分,对每部分的实现算法做了详细的说明。本文给出了LTE上行链路仿真结果,结果表明:在EPA信道下,链路能够抵抗100Hz左右的频偏,在026bE N?dB时,误码率能够达到34.59 10??;第二,LTE上行链路波形图形化开发。论文运用图形化开发工具System Generator完成了LTE上行链路波形图形化开发。给出LTE上行链路波形图形化实现的详细实现过程,对上行链路按照功能进行划分,划分为多个功能模块,然后对各功能模块的输入输出接口及内部处理流程进行了详细的设计,给出了各功能模块在System Generator上的具体实现方法;第三,在软件无线电上测试了LTE上行链路波形的功能及性能。利用自主研发的软件无线电平台,完成了LTE上行链路波形的功能及通信性能测试。测试结果表明,在人员干扰、机器干扰(电脑、频谱仪等设备)、墙体干扰的室内环境下,LTE上行链路波形能够正确传输文件、视频语音等功能。误码率实际测试性能比仿真结果差1.6dB。本文在uSDR平台上设计并实现了LTE上行链路波形,并通过了软件无线电平台验证,可用于高等院校、科研机构教学实验。同时丰富了软件无线电平台的波形功能,也为将来更加复杂波形的开发及通信系统的可视化、图形化开发提供了参考。在LTE上行链路波形的图形化开发中,许多的功能模块的实现都可以被复用,能够用于快速开发验证其它模式下的波形。
[Abstract]:With the advent of LTE multi-frequency and multi-mode smart phone era, it is required to support the LTE mode on the basis of 2GN 3G mode and to realize the working frequency band of international roaming. Therefore, the total frequency band is close to 40. For equipment manufacturers, the challenge of supporting so many standards and frequency bands is very great, and different hardware platforms need to be designed to support different standards and frequency bands. Therefore, the product development cycle is long, the design cost and the maintenance cost is very high. Therefore, many equipment manufacturers begin to adopt the increasingly mature software radio technology, hoping to use the software radio programmable. Reconfigurable and other advantages to achieve rapid development validation to reduce costs. Therefore, based on the uSDR software wireless platform developed by the team, the key technologies of LTE uplink are studied in this paper. The uplink waveform of LTE is designed and graphically developed according to the demand. The uplink waveform of LTE is developed. The main work of this paper is as follows: firstly, the frame structure and pilot signal design of LTE are studied. According to the requirement of function and performance of the link, the design scheme of LTE uplink waveform is given. The transmitter mainly adopts CRC coding and turbo coding. Scrambling 16QAM modulation SC-FDMA modulation, cyclic prefix and up-conversion are designed. In order to design and implement, the LTE uplink waveform processing flow is divided into transmitting units. The four parts of receiving unit, middle radio frequency processing unit and synchronization unit are described in detail. The simulation results of LTE uplink are given in this paper, and the results show that: in EPA channel. The link can resist about 100 Hz frequency offset at 026bE N? The error rate can reach 34.59 10? ? ; Number two. LTE uplink waveform graphical development. This paper uses the graphical development tool System. Generator completed the LTE uplink waveform graphical development, and gave a detailed implementation process of LTE uplink waveform graphical realization. The uplink is divided into several functional modules according to the function, and then the input and output interface of each functional module and the internal processing flow are designed in detail. The realization method of each function module on System Generator is given. Thirdly, the function and performance of LTE uplink waveform are tested on software radio. The function and communication performance of LTE uplink waveform are tested. The test results show that in the indoor environment of human interference, machine interference (computer, spectrometer and other equipment, wall interference). LTE uplink waveforms can transfer files correctly. The performance of BER testing is 1.6 dB worse than that of simulation results. The uplink waveform of LTE is designed and implemented on uSDR platform and verified by software radio platform. It can be used in teaching experiments in colleges and research institutions. It also enriches the waveform function of software radio platform, and also provides more complex waveform development and visualization of communication system in the future. In the graphical development of LTE uplink waveforms, many functional modules can be reused, which can be used to quickly develop and verify the waveforms in other modes.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN929.5
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本文编号：1356778