Orthogonal Time Frequency Space(OTFS)modulation has exhibited significant potential to further promote the performance of future wireless communication networks especially in high-mobility scenarios.In practical OTFS ...Orthogonal Time Frequency Space(OTFS)modulation has exhibited significant potential to further promote the performance of future wireless communication networks especially in high-mobility scenarios.In practical OTFS systems,the subcarrier-dependent Doppler shift which is referred to as the Doppler Squint Effect(DSE)plays an important role due to the assistance of time-frequency modulation.Unfortunately,most existing works on OTFS channel estimation ignore DSE,which leads to severe performance degradation.In this letter,OTFS systems taking DSE into consideration are investigated.Inspired by the input-output analysis with DSE and the embedded pilot pattern,the sparse Bayesian learning based parameter estimation scheme is adopted to recover the delay-Doppler channel.Simulation results verify the excellent performance of the proposed off-grid estimation approach considering DSE.展开更多
文摘Orthogonal Time Frequency Space(OTFS)modulation has exhibited significant potential to further promote the performance of future wireless communication networks especially in high-mobility scenarios.In practical OTFS systems,the subcarrier-dependent Doppler shift which is referred to as the Doppler Squint Effect(DSE)plays an important role due to the assistance of time-frequency modulation.Unfortunately,most existing works on OTFS channel estimation ignore DSE,which leads to severe performance degradation.In this letter,OTFS systems taking DSE into consideration are investigated.Inspired by the input-output analysis with DSE and the embedded pilot pattern,the sparse Bayesian learning based parameter estimation scheme is adopted to recover the delay-Doppler channel.Simulation results verify the excellent performance of the proposed off-grid estimation approach considering DSE.
