| OFDM系统中多导频的FFT信道估计算法 |
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| 引用本文： | 李勇,李雀.OFDM系统中多导频的FFT信道估计算法[J].信息安全与通信保密,2008(3):30-33. |
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| 作者姓名： | 李勇 李雀 |
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| 作者单位： | 西北工业大学电子信息学院机载电子综合信息系统创新实验室,陕西,西安,710072 |
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| 摘 要： | 论文提出了OFDM系统中基于FFT的信道估计方法，包括基于时域插值及变换域插值方法。时域插值算法的理论基础是利用FFT频域采样定理，可由频域有限频点的采样值经过IFFT／FFT得到整个频域传输函数的估计值，而不发生混叠。变换域插值算法的理论基础是利用FFT时域抽样定理，利用OFDM信号特点和信道特性，经过FFT／IFFT将信号和噪声分离，并在此基础上进行加窗改进算法，以减小插值中的频谱泄漏，提高估计效果。仿真结果说明，加窗的基于FFT变换域的方法性能有了很大改善。
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| 关 键 词： | 正交频分复用(OFDM)信道估计 导频 快速傅立叶变换(FFT)误码率 |
| 文章编号： | 1009-8054(2008)03-0030-04 |
| 修稿时间： | 2007年9月19日 |
Channel Estimation Algorithm Based on FFT with Multiple Pilot Patterns in OFDM System |
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| LI Yong,LI Que.Channel Estimation Algorithm Based on FFT with Multiple Pilot Patterns in OFDM System[J].China Information Security,2008(3):30-33. |
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| Authors: | LI Yong LI Que |
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| Affiliation: | (School of Electronic and Information, The Innovation LAB. of Airborne Electronic and Information System, Northwestern Polytechnical University, Xi＇an Shaanxi 710072, China) |
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| Abstract: | In this paper, two FFT-based channel estimation methods for Orthogonal Frequency Division Multiplexing （OFDM） are proposed, including time-domain interpolation and transform-domain interpolation. Time-domain interpolation is based on FFT sampling theorem in frequency domain. The estimation of transfer function in the wholc frequency domain is obtained by the limited sample values through IFFT/FFT without aliasing. Transform-domain interpolation is based on FFT sampling theorem in time domain, and the signal and noise are separated by FFT/IFFT taking advantage of the signal＇s characteristics and the channel＇s features of OFDM. On this basis, this paper presents improved window algorithm for minishing the spectral leakage during interpolation and improving the estimation effect. Analysis and simulation results indicate that the windowing method based on FFT transform-domain estimation is of good performance. |
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| Keywords: | OFDM channel estimation pilot symbols FFT bit error rate |
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