文章基本信息

标题：OFDM用等化器のシミュレーション検討
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作者：山本昭夫 ; 野上博志 ; 大久保隆志等
期刊名称：映像情報メディア学会誌
印刷版ISSN：1342-6907
电子版ISSN：1881-6908
出版年度：1998
卷号：52
期号：11
页码：1643-1649
DOI：10.3169/itej.52.1643
出版社：The Institute of Image Information and Television Engineers
摘要：We have studied equalization techniques using pilot carriers for an OFDM system. The signal to interference ratios (SIRs) of the equalizer output signal over a time-invariant multipath channel (D/U =10 dB) are calculated for several interpolation schemes : interpolation using FIR filters with the sinc functional impulse response, constant interpolation, linear interpolation, and simplified linear interpolation (which can be achieved without multipliers). The results show that an SIR of 27 dB (input CNR=30 dB, delay time of interference signal=11 μs) is obtained for simplified linear interpolation which can reduce the hardware complexity compared to other interpolation schemes. Also, we have confirmed that the tap numbers of the FIR filter can be reduced without degradation of the SIR by using a window function. Furthermore, for the FIR filters and the simplified linear interpolations, the SIRs are calculated in case of the timing phase offset for the FFT window position. The results show that the degradation of the SIR is very little even when the offset value becomes up to 20 samples for both cases.
关键词：OFDM;等化器;補間;FIRフィルタ;ステップ補間;直線補間