文档介绍：本科毕业论文(设计)
论文题目:基于导频的OFDM信道估计中
插值的研究
学生姓名:
所在院系: 机电学院
所学专业: 应用电子技术教育
导师姓名:
完成时间:
摘要
正交频分复用(OFDM)技术是一种高效的数字传输技术,它可以被看作一种调制技术,也可以被当作一种复用技术,因其具有较高的频谱利用率、功率利用率,优良的抗窄带干扰和多径衰落能力而被视为下一代无线通信的核心技术。移动通信中的无线传输信道是一个时变的多径衰落信道。为了使发送数据经过信道衰落后,在接收端被正确接收,数据所经的信道衰落影响就应该被合理补偿。信道估计技术作为获得信道衰落参数的手段,是现代无线通信领域中的一个研究热点,它是接收端进行相干检测、解调、均衡的基础,是提高无线数据传输接收性能的关键技术之一。在信道估计中,插值是个很重要的环节,在保证导频信号估计的正确性前提下,插值方式的好坏决定了信道估计性能的优劣。本文用数值分析的方法对基于导频的OFDM系统信道估计中的插值问题进行对比分析,并通过仿真实验,得出了科学的结论,给出了在不同的信噪比条件下应采用的导频图案及插值方法。
关键词:正交频分复用,信道估计,导频,插值
Abstract
Orthogonal Frequency Division Multiplexing (OFDM) technology is a highly efficient digital transmission technology, it can be seen as a modulation technique, could also be described as a kind of multiplexing, which has a higher spectrum efficiency, power efficiency, excellent narrow-band interference and multipath fading ability to be seen as the core of the next generation of munications technology. Channel Estimation in OFDM technology as one of the key technologies of modern munications in the area of a research hot spot, it is the receiver for coherent detection, demodulation and balanced basis. In channel estimation, the interpolation is a very important aspect. Pilot signals to ensure the accuracy of the estimated under the premise of quality interpolation mode determines the channel estimation performance is good or bad. In this paper, numerical analysis of the pilot-based channel estimation in OFDM systems in parative analysis of interpolation problem and, through simulation experiments, to draw a scientific conclusion, given the signal to noise ratio in different conditions to be used Pilot patterns and interpolation methods.
Key Words: Orthogonal Frequency Division Multiplexing, Channel Estimation, Pilot, Interpolation
目录
1 绪论 1
Equation Chapter 1 Section 12 OFDM原理和系统模型 2
Equation Chapter 1 Section 13 信道估计 4
信道模型 4
基于导频的OFDM系统信道估计算法分析模型 5
几种常用的信道估计算法 5
最小二乘(LS)信道估计算法 6
最小均方误差(MMSE)信道估计算法 6
最大似然(ML)估计算法 7