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当无线传输信道出现频谱零点,正交频分复用(OFDM)系统会出现严重的性能恶化。针对信道频谱零点带来的性能恶化问题,现有的OFDM系统采用信道编码和交织来恢复丢失的数据。为时域同步OFDM系统提出一种低复杂度的信号重建方法,该方法不需要对现有的时域同步OFDM发射机作任何额外的修改,完全在OFDM接收端进行,在均衡过程中重建因信道频谱零点而丢失的数据,并且其计算复杂度只与快速Fourier变换相当。计算机仿真证明,新方法的应用使时域同步OFDM系统的性能显著提升,大大优于现有的重叠相加均衡方法。
Orthogonal frequency division multiplexing (OFDM) systems suffer from severe performance degradation when spectral null occurs on the wireless transmission channel. In response to the performance degradation brought by the zero point of the channel spectrum, the existing OFDM system uses channel coding and interleaving to recover the lost data. This paper proposes a low complexity signal reconstruction method for time-domain synchronous OFDM system, which does not need to make any additional modifications to the existing time-domain synchronous OFDM transmitter and is completely performed at the OFDM receiving end. During the process of equalization, Channel spectrum zero loss of data, and its computational complexity is only equivalent to fast Fourier transform. Computer simulation shows that the application of the new method significantly improves the performance of time-domain synchronous OFDM system, which is much better than the existing overlap-plus-sum equalization method.