Pseudo-noise preamble based joint frame and frequency synchronization algorithm in OFDM communication systems

被引：0

作者：

Qingfeng Jing ^{[1
]}

Ming Cheng ^{[1
]}

Yuping Lu ^{[1
]}

Weizhi Zhong ^{[1
]}

Hongwei Yao ^{[1
]}

机构：

[1] College of Astronautics,Nanjing University of Aeronautics and Astronautics

来源：

Journal of Systems Engineering and Electronics | 2014年 / 25卷 / 01期

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

orthogonal frequency division multiplexing(OFDM); frame synchronization; carrier frequency offset(CFO) estimation; preamble; pseudonoise sequence;

D O I：

暂无

中图分类号：

TN919.3 [数据传输技术];

学科分类号：

0810 ; 081001 ;

摘要：

Frame and frequency synchronization are essential for orthogonal frequency division multiplexing(OFDM) systems. The frame offset owing to incorrect start point position of the fast Fourier transform(FFT) window, and the carrier frequency offset(CFO) due to Doppler frequency shift or the frequency mismatch between the transmitter and receiver oscillators, can bring severe intersymbol interference(ISI) and intercarrier interference(ICI) for the OFDM system. Relying on the relatively good correlation characteristic of the pseudonoise(PN) sequence, a joint frame offset and normalized CFO estimation algorithm based on PN preamble in time domain is developed to realize the frame and frequency synchronization in the OFDM system. By comparison, the performances of the traditional algorithm and the improved algorithm are simulated under different conditions. The results indicate that the PN preamble based algorithm both in frame offset estimation and CFO estimation is more accurate, resourcesaving and robust even under poor channel condition, such as low signaltonoise ratio(SNR) and large normalized CFO.

引用

页码：1 / 9

页数：9

共 3 条

[1] Adaptive compensating method for Doppler frequency shift using LMS and phase estimation[J]. Jing Qingfeng~1 & Guo Qing~2 1.Coll.of Astronautics,Nanjing Univ.of Aeronautics and Astronautics,Nanjing 210000,P.R.China;2.Communication Research Center,Harbin Inst.of Technology,Harbin 150001,P.R.China. Journal of Systems Engineering and Electronics. 2009(05)
[2] Block synchronization algorithms for UWB-OFDM systems[J] . Juan Augusto Maya,Cecilia G. Galarza. Digital Signal Processing . 2010 (2)
[3] An improved residual frequency offset estimation scheme for OFDM based WLAN systems[J] . Benudhar Sahu,Saswat Chakrabarti,S.L. Maskara. Digital Signal Processing . 2009 (2)

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