通信学报2026，Vol.47Issue(8)：18-29,12.DOI:10.11959/j.issn.1000-436x.TXXB260185
时变信道OFDM系统的过采样增强接收方法
Oversampling enhanced receiver method for OFDM systems over time-varying channels
摘要
Abstract
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.关键词
正交频分复用/过采样最小均方误差/多普勒频移/频域均衡/载波间干扰Key words
OFDM/oversampling-MMSE/Doppler spread/frequency-domain equalization/ICI分类
信息技术与安全科学引用本文复制引用
沙学军,王艺婷,房宵杰,王思涵..时变信道OFDM系统的过采样增强接收方法[J].通信学报,2026,47(8):18-29,12.基金项目
国家自然科学基金区域联合重点项目(No.U23A20278) （No.U23A20278）
石家庄市市级科技计划(No.2477916307A) The Key Program of the Regional Joint Fund of the National Natural Science Foundation of China(No.U23A20278),Shijiazhuang Municipal Science and Technology Program(No.2477916307A) （No.2477916307A）
