TY - JOUR
T1 - Frequency-shift filtering for OFDM systems and its performance analysis
AU - Tian, Jinfeng
AU - Guo, Haiyou
AU - Hu, Honglin
AU - Chen, Hsiao Hwa
N1 - Funding Information:
Manuscript received November 13, 2010; revised April 04, 2011; accepted April 04, 2011. Date of publication May 19, 2011; date of current version August 24, 2011. This work was supported in part by the Taiwan National Science Council Research Grant NSC99-2221-E-006-016-MY3, and by the National Natural Science Foundation of China under Grant 61002017 and 61072076.
PY - 2011/9
Y1 - 2011/9
N2 - 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.
AB - 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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U2 - 10.1109/JSYST.2011.2148770
DO - 10.1109/JSYST.2011.2148770
M3 - Article
AN - SCOPUS:80052045539
SN - 1932-8184
VL - 5
SP - 314
EP - 320
JO - IEEE Systems Journal
JF - IEEE Systems Journal
IS - 3
M1 - 5771071
ER -