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

ICI Analysis for FRFT-OFDM Systems to Frequency Offset in Time-Frequency Selective Fading Channels
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FRFT-OFDM 系统对时频选择性衰落信道频率偏移的 ICI 分析

DOI:
10.1109/lcomm.2010.072910.100562
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发表时间:
2010-10
期刊:
IEEE COMMUNICATIONS LETTERS
影响因子:
--
通讯作者:
Wang, Zulin
Wang, Zulin
中科院分区:
其他
文献类型:
--
作者:
Zheng, Jing;Wang, Zulin

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这封信介绍了时频选择性衰落信道中频率偏移对基于分数傅里叶变换(FRFT-OFDM)的正交频分复用系统的影响。 FRFT-OFDM系统通过部署FRFT概括了基于离散傅里叶变换的OFDM系统。推导了不同衰落信道中由 ICI 引起的信号干扰比 (SIR) 的表达式。在平坦通道中,两个系统的性能相同。在频率选择性信道中,当多普勒扩展与系统中存在的符号持续时间或载波偏移的倒数相当时,FRFT-OFDM系统通过选择最佳分数因子而具有优异的SIR性能。
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.
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