OFDM/OQAM系统自适应滤波器函数波形设计
首发时间:2017-01-20
摘要:传统的OFDM系统通过添加CP来提高系统抗ISI的能力,其不足是降低频谱利用率,且系统对频偏敏感的问题没有的到解决。该文讨论的是改进型OFDM/OQAM系统,其采用了时频聚焦特性良好的成型滤波器函数,在系统不需要添加CP的情况下,仍然具有很好抗ISI和ICI的能力。首先,文章讨论如何进行OFDM/OQAM系统成型滤波器函数的选取。然后,讨论了基于扩展高斯函数的OFDM/OQAM系统自适应滤波器波形设计方法,并得出结论。最后在不同信道扩展高斯函数不同扩展因子下进行性能分析。仿真结果验证了该方法的有效性。
关键词: OFDM OFDM/OQAM 扩展高斯函数 时频聚焦
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Design of adaptive filter function waveform in OFDM/OQAM system
Abstract:The traditional Orthogonal Frequency Division Multiplexing (OFDM) system increases the ability to resist Inter Symbol Interference (ISI) by adding Cyclic Prefix (CP). However, the drawback is inefficient spectrum utilization and not solving the problem of system's sensibility to frequency offset. This paper discusses an improved Orthogonal Frequency Division Multiplexing/Offset Quadrature Amplitude Mudulation (OFDM/OQAM) system, which uses the pulse-shaping filter function with good time-frequency localization. It has good robustness against ISI and ICI (Inter Carrier Interference) without adding CP. Firstly, the paper discusses how to select the shaping filter function of OFDM/OQAM system. Then, the adaptive filter waveform design method of OFDM/OQAM system based on EGF (Extended Gaussian Function) is discussed. Finally, the simulation result of the performance of different channel EGF function under different expansion factors is given, which verifies the effectiveness of this kind of method.
Keywords: OFDM;OFDM/OQAM;Extended Gaussian Function;Time Frequency Localization
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No.4716714117869314****
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