ICI Analysis for FRFT-OFDM Systems to Frequency Offset in Time-Frequency Selective Fading Channels

This letter presents the effects of frequency offset to orthogonal frequency division multiplexing systems based on fractional Fourier transform (FRFT-OFDM) in time-frequency selective fading channels. FRFT-OFDM systems generalize the OFDM systems based on discrete Fourier transform by the deployment of FRFT. The expressions of signal-to-interference ratio (SIR) due to ICI are derived in different fading channels. In a flat channel, the performances of both systems are the same. In a frequency selective channel, the FRFT-OFDM systems have superior SIR performances by choosing the optimal fractional factor, when Doppler spread is comparable to the inverse of the symbol duration or carrier offset exists in the system.

[1]  Chintha Tellambura,et al.  The effect of imperfect carrier frequency offset estimation on an OFDMA uplink , 2009, IEEE Transactions on Communications.

[2]  G. Giannakis,et al.  Wireless Multicarrier Communications where Fourier Meets , 2022 .

[3]  Soo-Chang Pei,et al.  Closed-form discrete fractional and affine Fourier transforms , 2000, IEEE Trans. Signal Process..

[4]  Chi Chung Ko,et al.  Intercarrier Interference Suppression for OFDMA Uplink in Time- and Frequency-Selective Fading Channels , 2009, IEEE Transactions on Vehicular Technology.

[5]  Marc Moeneclaey,et al.  BER sensitivity of OFDM systems to carrier frequency offset and Wiener phase noise , 1995, IEEE Trans. Commun..

[6]  Wen-Rong Wu,et al.  Low-Complexity ICI Mitigation Methods for High-Mobility SISO/MIMO-OFDM Systems , 2009, IEEE Transactions on Vehicular Technology.

[7]  Massimiliano Martone,et al.  A multicarrier system based on the fractional Fourier transform for time-frequency-selective channels , 2001, IEEE Trans. Commun..

[8]  Shaoping Chen,et al.  ICI and ISI analysis and mitigation for OFDM systems with insufficient cyclic prefix in time-varying channels , 2004, IEEE Trans. Consumer Electron..

[9]  Levent Onural,et al.  Optimal filtering in fractional Fourier domains , 1997, IEEE Trans. Signal Process..

[10]  Paul H. Moose,et al.  A technique for orthogonal frequency division multiplexing frequency offset correction , 1994, IEEE Trans. Commun..

[11]  Georgios B. Giannakis,et al.  Wireless multicarrier communications , 2000, IEEE Signal Process. Mag..

[12]  Mohsen Kavehrad,et al.  Effects of time selective multipath fading on OFDM systems for broadband mobile applications , 1999, IEEE Communications Letters.