کنفرانس مهندسی برق ایران

صفحه اصلی / سی و یکمین کنفرانس بین المللی مهندسی برق

Superimposed Channel Estimation in OTFS Modulation Using Compressive Sensing

نویسندگان :

Omid Abbassi Aghda¹ Mohammad Javad Omidi² Hamid Saeedi-sourck³

1- دانشگاه صنعتی اصفهان 2- دانشگاه صنعتی اصفهان 3- دانشگاه یزد

کلمات کلیدی :

Channel estimation،data detection،message passing،orthogonal matching pursuit،OTFS،superimpsoed pilot

چکیده :

Orthogonal time frequency space (OTFS) technique is a two dimensional modulation method that multiplexes information symbols in the delay-Doppler (DD) domain. OTFS combats high Doppler shift existing in high speed wireless communication. However, conventional channel estimation in OTFS suffers from high pilot overhead because guard symbols occupy a significant part of the DD domain grids. In this paper, a superimposed channel estimation is proposed which can completely estimate channel parameters without considering pilot overhead and performance degradation. As the channel state information (CSI) in the DD domain is sparse, a sparse recovery algorithm orthogonal matching pursuit (OMP) is used. Besides, our proposed method does not suffer from high peak to average power ratio (PAPR). To detect information symbols, a message passing (MP) detector, which exploits the sparsity of DD channel representation, is employed.