OFDM系统中ICI自消除算法研究

OFDM系统对频率偏移极为敏感,频率偏移将导致子载波之间失去正交性,于是产生子载波干扰（ICI）,从而降低系统性能。通过对有效抑制ICI的方法—ICI自消除算法进行研究,分析了ICI自消除算法对OFDM系统的影响。在软件无线电（GNU Radio）平台上搭建该系统,并在实际环境中运行。研究结果表明：与传统OFDM系统相比,ICI自消除算法使OFDM系统的误码率得到改善。

Inter carrier interference cancellation in OFDM systems

OFDM systems are very sensitive to frequency offset. Frequency shifts result in the loss of orthogonality between sub carriers, which will cause inter-carrier interference （ICI） and degrade the system performance. This paper studies an efficient ICI cancellation method referred to ICI self-cancellation scheme （SC） for combating ICI influences on OFDM systems. ICI self- cancellation scheme were tested using open source Software Defined Radio （SDR） namely GNU Radio. Experiment results show that OFDM systems using the proposed ICI self-cancellation scheme perform much better than OFDM systems without ICI self-cancellation scheme.