光通信研究Issue(3)：147-152,6.DOI:10.13756/j.gtxyj.2024.230076
基于OGCE-BEM的OTFS信道估计
OTFS Channel Estimation based on OGCE-BEM
摘要
Abstract
[Objective]With the development of the sixth generation mobile communication technology,the inter-carrier interfer-ence in the traditional Orthogonal Frequency Division Multiplexing(OFDM)system makes the channel estimation performance insufficient to provide highly reliable communication,and Orthogonal Time-Frequency Space(OTFS)system can effectively solve the problem of communication system reliability degradation caused by fast time variability and Doppler effect,which has re-ceived wide attention in recent years.[Methods]In order to effectively meet the channel estimation performance requirements of OTFS systems,this paper uses an Optimized Generalized Complex Exponential(OGCE)Basis Expansion Model(BEM)to cal-culate the channel impulse response as a time-invariant basis function with basis function coefficients,which can effectively fit fast time-varying channels in high-speed mobile communication scenarios.The OGCE-BEM improves the spectral leakage by more intensive sampling and reduces the error of the high-frequency basis model by adding correction coefficients to reduce the error of the HF-based model.[Results]The simulation results show that the proposed algorithm is suitable for high-speed mobile commu-nication scenarios with more reasonable design of the basis function.The estimation method has lower mean square error than the fixed forgetting factor,and the channel estimation results are more accurate.Compared with Least Square(LS),BEM-LS and BEM-Linear Minimum Mean Square Error(LMMSE)channel estimation methods,the performance of mean square error is sig-nificantly improved.[Conclusion]It can be seen that the channel estimation algorithm based on OGCE-BEM can effectively re-duce the number of unknown parameters to be estimated and improve the accuracy of channel estimation.关键词
正交时频空/优化的广义复指数基扩展模型/遗忘因子/信道估计Key words
OTFS/OGCE-BEM/forgetting factor/channel estimation分类
信息技术与安全科学引用本文复制引用
李心怡,解志斌,张金波,毛云龙..基于OGCE-BEM的OTFS信道估计[J].光通信研究,2024,(3):147-152,6.基金项目
国家自然科学基金资助项目(62276117) （62276117）
江苏省未来网络科研基金资助项目(FNSRFP-2021-YB-51) （FNSRFP-2021-YB-51）
