CoMP无线通信系统设计与实现
发布时间:2018-06-25 21:07
本文选题:CoMP + 波束赋形 ; 参考:《电子科技大学》2015年硕士论文
【摘要】:相比于基于CDMA的3G技术,以MIMO和OFDM为技术基础的现代无线通信系统,拥有更高数据传输能力和频谱利用率。但对于LTE系统,正交多址的方式使得小区间干扰非常严重,传统的小区干扰协调技术并不能有效改善小区边缘用户性能。为了满足IMT-Advanced系统指标,LTE-Advanced引入了CoMP技术,通过多个不同位置传输点的协作,共同为单个或多个用户提供数据服务,从而消除或抑制小区间干扰,增强小区覆盖范围,提高小区边缘吞吐率,进而提高系统整体容量。本文通过硬件实现,搭建起一套CoMP无线通信演示系统,完成对CoMP技术的功能验证。论文的工作主要包括以下三个部分:(1)首先介绍了CoMP的研究背景和产业现状,同时概述了CoMP关键技术,着重研究了联合传输和波束赋形两种传输模式,从物理层的实现技术预编码入手,通过对各预编码算法的仿真分析选取适合本系统硬件实现的方案。(2)接下来针对预编码算法的硬件实现,对其中的矩阵运算的方案进行分析,同时以4发4收的天线配置为例,详细介绍了基于脉动阵列的矩阵Cholesky分解、QR分解、矩阵求逆以及基于乘幂法迭代的主特征向量求解的算法架构,并利用硬件描述语言完成各模块设计实现。通过这一部分的工作,为CoMP无线通信系统的基带核心处理部分提供解决方案。(3)最后,立足于两基站两用户的应用场景,完成总体方案设计,并搭建下行仿真链路进行验证,为系统实现提供理论支撑。同时完成包括Turbo译码、MIMO检测、调制解调等多个核心基带模块的硬件设计,将物理层实现的硬件模块搭载在现有的基于多FPGA的片上网络多核阵列平台,完成系统板级调试和上下行无线空口测试。测试结果显示,本系统能有效的提升小区边缘用户性能。
[Abstract]:Compared with CDMA based 3G technology, modern wireless communication systems based on MIMO and OFDM have higher data transmission capacity and spectrum efficiency. However, for LTE systems, orthogonal multiple access makes the cell interference very serious, and the traditional cell interference coordination technology can not effectively improve the performance of cell edge users. In order to meet the requirements of IMT-Advanced system, LTE-Advanced introduces the comp technology, which provides data service for single or multiple users through the cooperation of multiple different transmission points, thus eliminating or suppressing inter-cell interference and enhancing cell coverage. The efficiency of cell edge throughput is improved, and the overall capacity of the system is improved. In this paper, a demo system of comp wireless communication is set up through hardware implementation, and the function of comp technology is verified. The main work of the thesis includes the following three parts: (1) firstly, the background and industry status of the camp are introduced. At the same time, the key technologies of the comp are summarized, and the two transmission modes of joint transmission and beamforming are emphatically studied. Starting with the realization technology of the physical layer, through the simulation analysis of each precoding algorithm, the scheme suitable for the hardware implementation of the system is selected. (2) next, aiming at the hardware implementation of the pre-coding algorithm, the matrix operation scheme is analyzed. At the same time, taking the antenna configuration of 4 transmitters and 4 receivers as an example, the algorithm architecture of matrix Cholesky factorization QR factorization based on pulsating array, matrix inversion and principal eigenvector solution based on power method iteration is introduced in detail. And use the hardware description language to complete the design and implementation of each module. Through the work of this part, it provides a solution for the baseband core processing part of the comp wireless communication system. (3) finally, based on the application scenario of two users of two base stations, the overall scheme design is completed, and the downlink simulation is built for verification. Provide theoretical support for system implementation. At the same time, the hardware design of several core baseband modules, such as Turbo decoding MIMO detection, modulation and demodulation, is completed. The hardware modules implemented in the physical layer are carried out on the existing multi-FPGA on-chip network multi-core array platform. Complete system board level debugging and uplink and downlink wireless air port test. The test results show that the system can effectively improve the performance of edge users.
【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:2067477
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