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目录
1 绪论................................................................................................................................................1
1.1 无线通信系统的发展 .........................................................................................................1
1.2 无线信道的特征..................................................................................................................2
1.2.1 衰减作用.............................................................................................................2
1.2.2 时变性................................................................................................................2
1.3 多载波技术 .........................................................................................................................3
1.3.1 多载波技术简介.................................................................................................3
1.4 SIMULINK 仿真工具.......................................................................................................3
1.5 论文研究的目的和意义 .....................................................................................................4
2 OFDM 的基本原理和系统组成 ...................................................................................................5
2.1 OFDM 的基本原理 .............................................................................................................5
2.2 OFDM 的循环保护间隔 ........................................................................................................6
2.3 OFDM 的系统组成 .............................................................................................................7
3 信道估计对提高系统抗干扰能力的作用 ...................................................................................8
3.1 相干检测与非相干检测 ........................................................................................................9
3.1.1 相干检测..................................................................................................................9
3.1.2 非相干检测..........................................................................................................10
3.2 信道估计算法 ......................................................................................................................10
3.2.2 频域信道估计算法.................................................................................................11
4 OFDM 系统中的同步技术 ........................................................................................................13
4.1 同步偏差对 OFDM 系统的影响 .........................................................................................13
4.1.1 载波频率偏差对 OFDM 系统的影响 ..................................................................14
4.1.2 符号定时偏差对 OFDM 系统的影响 ..................................................................18
4.1.3 采样定时偏差对 OFDM 系统的影响 ..................................................................19
4.2 同步算法 ..............................................................................................................................20
4.2.1 载波同步算法........................................................................................................20
4.3.2 定时同步算法.........................................................................................................21
4.2.3 样值同步算法........................................................................................................21
5 总结与展望 ..................................................................................................................................22
致谢..................................................................................................................................................24