【作者】 刘红亮；

【导师】 朱光喜； 周宗仪；

【作者基本信息】 华中科技大学 ， 通信与信息系统， 2008， 硕士

【摘要】 移动WiMAX空口规范采用IEEE802.16e协议,采用全IP包分复用互联架构,功能上融合了蜂窝移动通信系统与宽带无线城域网,支持固定、便携、车载环境下的高速数据传输与异构网间无缝切换,通过构建软件化的通信平台实现高可靠信道编码、正交频分多址、空时处理、分布式天线等关键技术。移动散射环境丰富,向量矩阵运算频繁,多种业务融合,使移动WiMAX无线算法复杂度提高了一个数量级,提供高运算性能的数字信号处理器成为一个挑战。本文以“基于RoF的移动通信创新平台研究”为课题背景,探索了picoArray阵列DSP在移动WiMAX基带设计上的独特优势。本文的研究围绕移动WiMAX基带硬件总体方案设计与关键技术基础理论两个方面展开。基带设计方面,文章首先分析了创新平台物理层的设计目标,比较了ASIC,FPGA,DSP三种数字信号处理器特点,然后以picoArray阵列DSP处理器为核心,阐述了基站和移动终端基带硬件架构,软件功能模块互联关系,并针对picoArray DSP的海量总线带宽与运算性能,提出了一种兼顾系统容量与接入公平的picoArray比例公平子载波分配算法,仿真评估了该算法性能,分析了最优的算法关键参量取值区间;关键技术方面,本文研究了OFDM原理,论述了空时编译码规则,分析了集中式MIMO的系统容量,并推导了集中式MIMO与分布式MIMO的通用信道矩阵结构。本文也研究了IEEE802.16e协议栈结构、信道编解码技术规范、OFDMA标准传输结构,全面描述了picoArray技术及其典型产品,picoArray阵列DSP阵元特征,软件开发环境,可用编程资源及系统开发流程,并最终采用picoArray阵列DSP实现了一种高效的流水线FFT结构。更多还原

【Abstract】 Based on the IEEE802.16e air interface standard, the mobile WiMAX is All-IP architecture of packet division multiplexing, which takes the advantage of both cellular mobile communication system and broadband wireless metropolitan area networks. Mobile WiMAX also supports high speed data transmission in stationary, pedestrian and fast-moving scenarios, and seamless handover between heterogeneous networks. With the employment of Software Defined Radio (SDR) techniques, a wireless communications platform is established to implement the key technologies such as channel coding, Orthogonal Frequency Division Multiple Access (OFDMA), space time processing and distributed antenna. Due to complex mobile environment, large-scale matrix operation and various services convergence, the wireless algorithm complexity in mobile WiMAX gets greatly increased, how to provide a kind of high performance digital signal processor is becoming a challenge. With the background of "the Research on Innovative Mobile Communications Platform", the baseband signal processing design of mobile WiMAX using picoArray DSP is explored in this paper.The research focuses on the hardware infrastructure design and wireless algorithm modules implementation of mobile WiMAX baseband signal processing. In aspect of baseband design, firstly, technical objective of the innovative platform’s physical layer is analyzed in this paper. Then, the characteristics of various digital signal processors such as ASIC, FPGA, DSP are compared, the picoArray DSP processor is employed in Base Staion (BS) and Mobile Terminal (MT) hardware architecture, which provides a software platform to interlink wireless algorithm modules. According to extremely broad bandwidth of local bus and powerful calculation capability of picoArray, a dynamic subcarrier allocation algorithm called picoArray proportional fairness algorithm is proposed,which is capable of achieving balance of system capacity and access fairness. A simulation system is established to evaluate and verify the algorithm, based on the simulation result, the algorithm’s critical parameter is suggested to be selected from a proper interval, within which, the algorithm performance is optimized. In aspect of key techniques, the exploring of the principle of OFDM, the research of space-time coding and decoding rules , the analysis of system capacity of centralized MIMO, and the deduction of the common channel matrix structure of centralized MIMO and distributed MIMO are contained in this paper as well.Meanwhile, in this paper, IEEE802.16e protocol stack, channel coding and decoding technical specifications, OFDMA standard symbol and frame structure, picoArray technology and its typical products are introduced. As for processor chip, the features of DSP array element of picoArray, software development environment, available programming resources and system development process are described detailedly. At last, an efficient pipeline FFT structure is implemented using picoArray DSP.更多还原