数字中频技术的研究与FPGA实现（优秀论文）

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第一章绪论....................................................................................................................1
1.1软件无线电............................................................................................................1
1.2数字中频与FPGA................................................................................................3
1.3论文的主要研究内容和章节安排........................................................................4
第二章数字中频技术的理论基础................................................................................5
2.1信号采样理论........................................................................................................5
2.1.1低通采样定理................................................................................................5
2.1.2带通采样定理................................................................................................5
2.2多速率数字信号处理............................................................................................6
2.2.1整数倍抽取....................................................................................................7
2.2.2整数倍内插....................................................................................................7
2.2.3有理数因子采样率转换................................................................................8
2.2.4 Noble恒等式..................................................................................................8
2.2.5信号的多相分解............................................................................................9
2.2.6采样率变换的多级实现..............................................................................10
2.3高效数字滤波.......................................................................................................11
2.3.1 FIR滤波器....................................................................................................12
2.3.2积分梳状CIC滤波器.................................................................................12
2.3.3半带滤波器..................................................................................................13
2.4数字信号正交变换理论......................................................................................14
2.5数字中频主要算法..............................................................................................15
2.5.1 CORDIC算法...............................................................................................15
2.5.2 DA算法........................................................................................................172.6本章小结..............................................................................................................19
第三章数字中频技术及其实现..................................................................................20
3.1数字上下变频技术..............................................................................................20
3.1.1数字上下变频基本原理与结构..................................................................20
3.1.2影响数字变频器性能的主要因素..............................................................21
3.2 NCO混频模块.....................................................................................................21
3.2.1查找表法......................................................................................................22
3.2.1.1查找表法的基本结构...........................................................................22
3.2.1.2查找表法参数的确定...........................................................................22
3.2.1.3查找表法的FPGA实现.......................................................................24
3.2.2 CORDIC法...................................................................................................26
3.2.2.1 CORDIC法的基本结构........................................................................26
3.2.2.2 CORDIC法参数的确定........................................................................27
3.2.2.3 CORDIC法的FPGA实现....................................................................28
3.2.3两种实现方式的比较..................................................................................30
3.3抽取(内插)滤波模块...........................................................................................31
3.3.1 CIC、HB滤波器级联..................................................................................31
3.3.1.1 CIC滤波器的设计................................................................................31
3.3.1.2半带滤波器的设计................................................................................38
3.3.1.3 CIC、HB级联方式的优缺点...............................................................38
3.3.2 FIR滤波器....................................................................................................39
3.3.2.1 MAC直接实现方式..............................................................................39
3.3.2.2 DA算法实现.........................................................................................40
3.3.3多相结构滤波器..........................................................................................43
3.3.3.1多相滤波器的结构................................................................................43
3.3.3.2多相滤波结构的优点............................................................................43
3.3.4三种抽取(内插)滤波方式的比较...............................................................443.4本章小结..............................................................................................................45
第四章数字下变频系统的设计及FPGA实现.........................................................46
4.1数字下变频系统方案的设计..............................................................................46
4.1.1 NCO混频模块的设计..................................................................................46
4.1.2抽取滤波器的设计......................................................................................48
4.1.2.1滤波器类型的选择...............................................................................48
4.1.2.2 System View简介..................................................................................49
4.1.2.3滤波器设计结果...................................................................................50
4.1.3系统仿真结果..............................................................................................52
4.2系统的FPGA设计.............................................................................................55
4.2.1 NCO的实现..................................................................................................55
4.2.2滤波器的实现..............................................................................................55
4.2.2.1 DA算法结合抽取结构实现.................................................................56
4.2.2.2 DA算法结合多相滤波结构实现.........................................................59
4.2.2.3两种实现方式的比较...........................................................................61
4.2.3系统的实现及性能分析...............................................................................62
4.3本章小结..............................................................................................................63
第五章数字变频系统的仿真验证..............................................................................64
5.1基于仿真的验证..................................................................................................64
5.2数字变频关键模块仿真验证..............................................................................65
5.2.1 NCO混频模块的仿真..................................................................................65
5.2.2滤波抽取(内插)模块的仿真.......................................................................66
5.3.数字下变频系统的仿真验证.............................................................................67
5.3.1 NCO混频的仿真..........................................................................................67
5.3.2 FIR滤波器的仿真........................................................................................68
5.3.3系统的仿真..................................................................................................695.4本章小结..............................................................................................................72
第六章结论和展望......................................................................................................73
致谢............................................................................................................................74

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