认知无线电实验终端的软件设计和OFDM导频辅助信道估计算法的实现硕士.doc
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1、【精品文档】如有侵权,请联系网站删除,仅供学习与交流认知无线电实验终端的软件设计和OFDM导频辅助信道估计算法的实现硕士.精品文档.认知无线电实验终端的软件设计和OFDM导频辅助信道估计算法的实现Software Design of Cognitive Radio Experimental Terminal and Implementation of OFDM PSAM Channel EstimationA thesis submitted toXian Jiaotong Universityin partial fulfillment of the requirementsfor the
2、degree ofMaster of Engineering ScienceByKun Niu(Information and Communication Engineering)Supervisor: Associate Prof. Xinmin LuoMay 2008论文题目:认知无线电实验终端的软件设计和OFDM导频辅助信道估计算法的实现学科专业:信息与通信工程申请人:牛坤指导教师:罗新民 副教授摘 要 本研究得到国家高技术研究发展计划(“863”计划)项目(编号:2005AA123940);陕西省自然科学基金资助项目(2006F41);陕西省科技攻关计划项目(2005K04-G11)资
3、助。认知无线电(Cognitive Radio,CR)是一种用于提高无线通信频谱资源利用率的技术,为了对认知无线电的理论方法和礼仪协议进行更深入的实验评估和研究,项目组在第一版实验系统的基础上,研制了第二版认知无线电实验系统。论文主要完成了第二版认知无线电实验系统中的基带和中频部分的软件设计,实现了基于OFDM的无线通信功能,并在实验系统中实现了OFDM导频辅助的信道估计算法。论文首先介绍了认知无线电实验系统的设计目标,总体结构和性能指标。接着介绍了实验终端上/下变频器件和D/A器件的软件配置,分析并解决了频谱翻转,子载波镜像,高频子载波幅度衰减等问题。论文设计了基带和中频各模块间的软件接口,
4、包括接收通道下变频器件与同步模块、DSP与同步模块、DSP与译码模块间的接口,保证数据能够正确传输。然后介绍了DSP片内外设的配置情况以及一些初始化配置。之后对如何提高系统有效数据率作了讨论,列出了实现过程中所能达到的技术参数。随后在总结常见的OFDM导频辅助信道估计方法的基础上,论文给出了适合实验系统的信道估计实现方案,完成了算法的DSP实现,通过对程序的时间和空间复杂度的分析,表明算法能够满足系统设计的时序要求。最后论文设计了闭环测试程序,并在FDD工作方式下对误比特率进行了测试和分析,验证了实现方案能够满足系统设计的传输质量要求。论文提到的认知无线电实验终端软件设计已完成并调试成功,系统
5、能够正常工作。实现了OFDM导频辅助信道估计算法,算法能够满足系统设计的时序和传输质量要求。关 键 词:认知无线电实验系统;正交频分复用;信道估计;DSP论文类型:应用研究Title: Software Design of Cognitive Radio Experimental Terminal and Implementation of OFDM PSAM Channel EstimationSpeciality:Information and Communication EngineeringApplicant:Kun NiuSupervisor:Associate Prof. Xinm
6、in LuoABSTRACT Funded by“The research was supported by the Hi-tech Rearch and Development Program of China (“863”Plan)(NO.2005AA123910)“,“The Nature Science Fundation of Shaanxi Province(NO.2006F41)”,“The Science and Technology Plan Foundation of Shaanxi Province(NO.2005K04-G11)”.Cognitive Radio is
7、a smart technology used to improve the utilization of spectrum resource.In order to verify not only the theory of Cognitive Radio technology, but also the etiquette and protocol of Cognitive Radio, we designed a new cognitive radio experimental system. This thesis mainly focuses on software design o
8、f the baseband and IF of the receiving module,the implementation of wireless communication of the second edition CR experimental system and the implementation of OFDM channel estimation based on the second edition CR experimental system.The content of the thesis can be summarized as follows:Firstly,
9、design object,total stucture,and parameters of CR experimental system were introduced.Secondly,the software configuration of IF devices was introduced,then the thesis analysized the reasons of spectrum flip,subcarrier mirror, high-frequency attenuation of subcarrier.The design of interfaces between
10、modules of baseband and IF,such as the interface between receiving module and sync module,the interface beween DSP and sync module and the interface between DSP and decoding module,was proposed.Through these interfaces data can be transmitted smoothly.Then the configuration of DSP was introduced.The
11、n the thesis discussed how to improve the data race.Thirdly, on the basis of the introduction of common OFDM PSAM channel estimation,the thesis introduced an implementation method of channel estimation for the CR experimental system and completed the DSP implementation of the algorithm. The time and
12、 space complexity of the algorithm was analysized.The result is that the algorithm can meet the timing requirements.Through the closed-loop test program,the BER was tested and analysized.The result is that the method can match the transmission quality requirements of the system.Software design of CR
13、 terminal has already been finished.The system can work normally.The implementation has already been finished too,and the conclusion that the algorithm can match the timing and quality requirements of the system is made.KEY WORDS: Cognitive radio experimental system; OFDM; Channel estimation; DSPTYP
14、E OF THESIS: Applied Research目 录1 绪论11.1 选题意义及应用背景11.2 国内外研究现状分析11.3 本文研究的主要工作和结构安排32 认知无线电系统概述52.1 认知无线电系统的设计目标52.2 认知无线电实验系统的总体结构52.2.1 认知无线电实验系统的网络拓扑结构52.2.2 认知无线电终端62.2.3 认知无线电实验系统参数72.3 本章小结83 认知无线电实验终端中频和基带模块的软件设计93.1 中频器件的配置93.1.1 发送模块中频器件的配置93.1.2 接收模块中频器件的配置143.2 基带和中频各模块间的接口设计193.2.1 GC101
15、2B与同步模块的接口193.2.2 同步模块与DSP的接口203.2.3 译码模块与DSP的接口213.3 DSP的初始化设置223.3.1 外部存储器接口233.3.2 扩展的直接存储器访问233.3.3 中断243.3.4 通用输入/输出外设253.4 关于提高有效数据率的讨论263.5 本章小结284 OFDM信道估计技术294.1 无线信道特性294.1.1 大尺度衰落294.1.2 小尺度衰落304.2 OFDM信道估计334.2.1 发送端导频的选择与插入334.2.2 接收端导频位置信道信息获取344.2.3 数据子载波位置信道信息获取364.3 本章小结385 OFDM信道估计
16、在认知无线电系统中的实现395.1 实验系统整体对接结构395.2 实验方案设计和参数的确定405.3 OFDM信道估计的设计与实现425.3.1 在时域纠小数倍频偏435.3.2 FFT变换455.3.3 块状导频作信道估计465.3.4 分散导频作信道估计495.4 算法复杂度和性能分析495.4.1 复杂度分析495.4.2 性能分析515.5 本章小结536 总结与展望546.1 总结546.2 展望54致 谢56参考文献57声明CONTENTS1 Preface11.1 Topic Signifacance and Background11.2 Status quo of the R
17、esearch11.3 Main Work and Structure in the Dissertation32 Summary of Cognitive Radio System52.1 Designing Goals of CR Experimental System52.2 Structure of CR Experimental System52.2.1 Network Topology Structure52.2.2 CR Terminal62.2.3 Parameters of CR Experimental System72.3 Brief Summary83 Software
18、 Design of IF and Baseband Modules of CR System93.1 IF Devices Configuration93.1.1 Send Module IF Device Configuration93.1.2 IF Receiver Module Device Configuration153.2 Design of Baseband and IF Interfaces between the Various Modules193.2.1 Design of Interface between GC1012B and SYNC Module203.2.2
19、 Design of Interface between SYNC Module and DSP203.2.3 Design of Interface between Decoding Module and DSP213.3 DSP Configuration223.3.1 External Memory Interface Design233.3.2 EDMA Configuration233.3.3 Interrupt Configuration243.3.4 GPIO Configuration253.4 Discussion on the Improvement of Effectiv
20、e Data Rate263.5 Brief Summary284 Research of OFDM Channel Estimation Method294.1 Characteristics of Wireless Channel294.1.1 Large-scale Decline294.1.2 Small-scale Decline304.2 OFDM Channel Estimation334.2.1 Pilot Insertion Method in Send Module334.2.2 Channel Estimation of Pilot Subcarrier344.2.3 C
21、hannel Estimation of Data Subcarrier364.3 Brief Summary385 Implementation of Channel Estimation in CR System395.1 Structure of the Experimental docking System395.2 Design Expermental Method and Parameters405.3 Design and Implementation of OFDM Channel Estimation425.3.1 Correct the Frequency Offset i
22、n Time Domain435.3.2 FFT455.3.3 Correct the Frequency Offset in Frequency Domain465.3.4 Channel Estimation by Scattered Pilot495.4 Algorithm Complexity and Performance Analysis495.4.1 Algorithm Complexity Analysis495.4.2 Performance Analysis515.5 Brief Summary536 Conclusions and Suggestions546.1 Con
23、clusions546.2 Suggestion54Acknowledgements56References57Declaration在每一章的末尾插入下一章的MathType的章标记(打印前将其字体颜色变为白色,在打印预览中看不见即可):Equation Chapter 1 Section 11 绪论1.1 选题意义及应用背景无线频谱是一种珍贵的自然资源,它的分配利用通常是由无线电法规部门确定的。目前世界各国采用的是基于静态频带分配的原则和方案。近年来,通信界普遍认识到,静态频带分配是造成当前频谱资源日趋缺乏的一个主要原因。2002年11月,美国联邦通信委员会(FCC)发布了一项由Spect
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