时变信道OFDM系统的过采样增强接收方法OA

To address the destruction of subcarrier orthogonality,increased inter-carrier interference(ICI),and the limited performance of conventional frequency-domain equalization caused by orthogonal frequency-division multiplexing(OFDM)spectral broadening in time-varying channels,a frequency-domain minimum mean square error(MMSE)equal-ization method based on receiver-side waveform oversampling was proposed.Without changing the transmitter condi-tions,the receiver-side oversampled waveform captured the out-of-band spectral energy leakage caused by Doppler spread,thereby providing a finer basis for subsequent spectrum compensation.On this basis,an improved linear MMSE equalizer was constructed to suppress ICI.Theoretical analysis and simulations show that,under the 5G NR TDL-C dou-bly selective channel,compared with conventional sampled frequency-domain MMSE equalization,the proposed method effectively reduces the bit error rate and improves link robustness,which is helpful for further improving the per-formance of time-varying channels such as low-altitude communications and high-speed ground mobility.