Frequency-Shift Filtering for OFDM Systems and Its Performance Analysis

被引：15
作者：
Tian, Jinfeng [1 ,2 ]
Guo, Haiyou [1 ,2 ]
Hu, Honglin [1 ,2 ]
Chen, Hsiao Hwa [3 ]
机构：
[1] Chinese Acad Sci, Shanghai Res Ctr Wireless Commun WiCO, Shanghai, Peoples R China
[2] Chinese Acad Sci, SIMIT, Shanghai, Peoples R China
[3] Natl Cheng Kung Univ, Dept Engn Sci, Tainan 70101, Taiwan
来源：
IEEE SYSTEMS JOURNAL | 2011年 / 5卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Frequency-shift filtering; MMSE; OFDMsystem; wireless communication;
D O I：
10.1109/JSYST.2011.2148770
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
Orthogonal frequency division multiplexing (OFDM) technique has been widely used in high data rate wireless applications, but it suffers performance degradation at low signal-to-noise (SNR) regions due to the impairments caused by noise-induced channel estimation errors. In this article, we propose to use frequency-shift (FRESH) filtering technique to exploit temporal and spectral correlation of the OFDM signals for noise reduction purpose. A closed form time-varying minimum mean squared error (MMSE) expression has been derived to analyze the performance of FRESH filtering under additive white Gaussian noise (AWGN) and Rayleigh fading channels. The MMSE analysis carried out here can be a reference for the design of practical OFDM systems. In addition, theoretical SNR is analyzed in this article to show the performance gain achieved by FRESH filtering. The numerical results verify that the maximum SNR improvements offered by FRESH filtering are over 0.6 dB and 1.6 dB under AWGN and Rayleigh fading channels, respectively.
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页码：314 / 320
页数：7
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