【作者】 丁丽娅； 侯春萍； 王兆华；

【Author】 DingLiYa~1 HouChunPing~2 WangZhaoHua~3 School of electronic and information engineering ,Tianjin Uinversity ,300072

【机构】 天津大学电子信息工程学院；

【摘要】 本文提出了一种改进的正交频分复用系统,该系统是在传统 OFDM 系统引入 APFFT 技术实现的。 APFFT 技术具有相位不变性和频谱幅度为 FFT 频谱的平方关系等性能,改进后的系统信噪比性能提高了 2dB,而且存在载波频率偏移时子载波间的干扰为传统 OFDM 系统的平方,大大降低了系统对频偏的敏感性。更多还原

【Abstract】 This paper has proposed an improved orthogonal frequency-division multiplexed system,w which introduces the tech- nique APFFT into the traditional OFDM system.APFFT having invariable phase and its spectrum amplitude being square of con- ventional FFT,the improved system has increased the performance of SNR by 2dB.Moreover,in the case of frequency offset,the amplitude of inter-carrier interference in the improved system is the square of that in the conventional OFDM system.,thus the improved system has greatly reduced the sensibility to frequency offset.更多还原